License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2009-04-09 02:40:59 +08:00
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#include <trace/syscall.h>
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2009-08-25 05:43:14 +08:00
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#include <trace/events/syscalls.h>
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tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
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#include <linux/syscalls.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/slab.h>
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2009-03-07 12:52:59 +08:00
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#include <linux/kernel.h>
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2011-05-27 05:53:52 +08:00
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#include <linux/module.h> /* for MODULE_NAME_LEN via KSYM_SYMBOL_LEN */
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2009-08-11 04:52:47 +08:00
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#include <linux/ftrace.h>
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perf: Do the big rename: Performance Counters -> Performance Events
Bye-bye Performance Counters, welcome Performance Events!
In the past few months the perfcounters subsystem has grown out its
initial role of counting hardware events, and has become (and is
becoming) a much broader generic event enumeration, reporting, logging,
monitoring, analysis facility.
Naming its core object 'perf_counter' and naming the subsystem
'perfcounters' has become more and more of a misnomer. With pending
code like hw-breakpoints support the 'counter' name is less and
less appropriate.
All in one, we've decided to rename the subsystem to 'performance
events' and to propagate this rename through all fields, variables
and API names. (in an ABI compatible fashion)
The word 'event' is also a bit shorter than 'counter' - which makes
it slightly more convenient to write/handle as well.
Thanks goes to Stephane Eranian who first observed this misnomer and
suggested a rename.
User-space tooling and ABI compatibility is not affected - this patch
should be function-invariant. (Also, defconfigs were not touched to
keep the size down.)
This patch has been generated via the following script:
FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
sed -i \
-e 's/PERF_EVENT_/PERF_RECORD_/g' \
-e 's/PERF_COUNTER/PERF_EVENT/g' \
-e 's/perf_counter/perf_event/g' \
-e 's/nb_counters/nb_events/g' \
-e 's/swcounter/swevent/g' \
-e 's/tpcounter_event/tp_event/g' \
$FILES
for N in $(find . -name perf_counter.[ch]); do
M=$(echo $N | sed 's/perf_counter/perf_event/g')
mv $N $M
done
FILES=$(find . -name perf_event.*)
sed -i \
-e 's/COUNTER_MASK/REG_MASK/g' \
-e 's/COUNTER/EVENT/g' \
-e 's/\<event\>/event_id/g' \
-e 's/counter/event/g' \
-e 's/Counter/Event/g' \
$FILES
... to keep it as correct as possible. This script can also be
used by anyone who has pending perfcounters patches - it converts
a Linux kernel tree over to the new naming. We tried to time this
change to the point in time where the amount of pending patches
is the smallest: the end of the merge window.
Namespace clashes were fixed up in a preparatory patch - and some
stylistic fallout will be fixed up in a subsequent patch.
( NOTE: 'counters' are still the proper terminology when we deal
with hardware registers - and these sed scripts are a bit
over-eager in renaming them. I've undone some of that, but
in case there's something left where 'counter' would be
better than 'event' we can undo that on an individual basis
instead of touching an otherwise nicely automated patch. )
Suggested-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux-arch@vger.kernel.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-21 18:02:48 +08:00
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#include <linux/perf_event.h>
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2019-11-16 07:44:42 +08:00
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#include <linux/xarray.h>
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2009-03-07 12:52:59 +08:00
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#include <asm/syscall.h>
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#include "trace_output.h"
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#include "trace.h"
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2009-03-16 05:10:37 +08:00
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static DEFINE_MUTEX(syscall_trace_lock);
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2009-03-07 12:52:59 +08:00
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2015-05-05 23:45:27 +08:00
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static int syscall_enter_register(struct trace_event_call *event,
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2012-02-15 22:51:49 +08:00
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enum trace_reg type, void *data);
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2015-05-05 23:45:27 +08:00
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static int syscall_exit_register(struct trace_event_call *event,
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2012-02-15 22:51:49 +08:00
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enum trace_reg type, void *data);
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2010-04-22 00:27:06 +08:00
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2010-04-22 22:35:55 +08:00
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static struct list_head *
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2015-05-05 23:45:27 +08:00
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syscall_get_enter_fields(struct trace_event_call *call)
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2010-04-22 22:35:55 +08:00
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{
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struct syscall_metadata *entry = call->data;
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return &entry->enter_fields;
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}
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tracing: Replace syscall_meta_data struct array with pointer array
Currently the syscall_meta structures for the syscall tracepoints are
placed in the __syscall_metadata section, and at link time, the linker
makes one large array of all these syscall metadata structures. On boot
up, this array is read (much like the initcall sections) and the syscall
data is processed.
The problem is that there is no guarantee that gcc will place complex
structures nicely together in an array format. Two structures in the
same file may be placed awkwardly, because gcc has no clue that they
are suppose to be in an array.
A hack was used previous to force the alignment to 4, to pack the
structures together. But this caused alignment issues with other
architectures (sparc).
Instead of packing the structures into an array, the structures' addresses
are now put into the __syscall_metadata section. As pointers are always the
natural alignment, gcc should always pack them tightly together
(otherwise initcall, extable, etc would also fail).
By having the pointers to the structures in the section, we can still
iterate the trace_events without causing unnecessary alignment problems
with other architectures, or depending on the current behaviour of
gcc that will likely change in the future just to tick us kernel developers
off a little more.
The __syscall_metadata section is also moved into the .init.data section
as it is now only needed at boot up.
Suggested-by: David Miller <davem@davemloft.net>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-02-03 06:06:09 +08:00
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extern struct syscall_metadata *__start_syscalls_metadata[];
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extern struct syscall_metadata *__stop_syscalls_metadata[];
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2009-09-19 12:50:42 +08:00
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2019-11-16 07:44:42 +08:00
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static DEFINE_XARRAY(syscalls_metadata_sparse);
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2009-09-19 12:50:42 +08:00
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static struct syscall_metadata **syscalls_metadata;
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2011-02-03 11:27:23 +08:00
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#ifndef ARCH_HAS_SYSCALL_MATCH_SYM_NAME
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static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
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{
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/*
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* Only compare after the "sys" prefix. Archs that use
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* syscall wrappers may have syscalls symbols aliases prefixed
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2013-03-11 15:13:51 +08:00
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* with ".SyS" or ".sys" instead of "sys", leading to an unwanted
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2011-02-03 11:27:23 +08:00
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* mismatch.
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*/
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return !strcmp(sym + 3, name + 3);
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}
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#endif
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tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
#ifdef ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
|
|
|
|
/*
|
|
|
|
* Some architectures that allow for 32bit applications
|
|
|
|
* to run on a 64bit kernel, do not map the syscalls for
|
|
|
|
* the 32bit tasks the same as they do for 64bit tasks.
|
|
|
|
*
|
|
|
|
* *cough*x86*cough*
|
|
|
|
*
|
|
|
|
* In such a case, instead of reporting the wrong syscalls,
|
|
|
|
* simply ignore them.
|
|
|
|
*
|
|
|
|
* For an arch to ignore the compat syscalls it needs to
|
|
|
|
* define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS as well as
|
|
|
|
* define the function arch_trace_is_compat_syscall() to let
|
|
|
|
* the tracing system know that it should ignore it.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
if (unlikely(arch_trace_is_compat_syscall(regs)))
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
return syscall_get_nr(task, regs);
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int
|
|
|
|
trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
return syscall_get_nr(task, regs);
|
|
|
|
}
|
|
|
|
#endif /* ARCH_TRACE_IGNORE_COMPAT_SYSCALLS */
|
|
|
|
|
tracing: Replace syscall_meta_data struct array with pointer array
Currently the syscall_meta structures for the syscall tracepoints are
placed in the __syscall_metadata section, and at link time, the linker
makes one large array of all these syscall metadata structures. On boot
up, this array is read (much like the initcall sections) and the syscall
data is processed.
The problem is that there is no guarantee that gcc will place complex
structures nicely together in an array format. Two structures in the
same file may be placed awkwardly, because gcc has no clue that they
are suppose to be in an array.
A hack was used previous to force the alignment to 4, to pack the
structures together. But this caused alignment issues with other
architectures (sparc).
Instead of packing the structures into an array, the structures' addresses
are now put into the __syscall_metadata section. As pointers are always the
natural alignment, gcc should always pack them tightly together
(otherwise initcall, extable, etc would also fail).
By having the pointers to the structures in the section, we can still
iterate the trace_events without causing unnecessary alignment problems
with other architectures, or depending on the current behaviour of
gcc that will likely change in the future just to tick us kernel developers
off a little more.
The __syscall_metadata section is also moved into the .init.data section
as it is now only needed at boot up.
Suggested-by: David Miller <davem@davemloft.net>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-02-03 06:06:09 +08:00
|
|
|
static __init struct syscall_metadata *
|
|
|
|
find_syscall_meta(unsigned long syscall)
|
2009-09-19 12:50:42 +08:00
|
|
|
{
|
tracing: Replace syscall_meta_data struct array with pointer array
Currently the syscall_meta structures for the syscall tracepoints are
placed in the __syscall_metadata section, and at link time, the linker
makes one large array of all these syscall metadata structures. On boot
up, this array is read (much like the initcall sections) and the syscall
data is processed.
The problem is that there is no guarantee that gcc will place complex
structures nicely together in an array format. Two structures in the
same file may be placed awkwardly, because gcc has no clue that they
are suppose to be in an array.
A hack was used previous to force the alignment to 4, to pack the
structures together. But this caused alignment issues with other
architectures (sparc).
Instead of packing the structures into an array, the structures' addresses
are now put into the __syscall_metadata section. As pointers are always the
natural alignment, gcc should always pack them tightly together
(otherwise initcall, extable, etc would also fail).
By having the pointers to the structures in the section, we can still
iterate the trace_events without causing unnecessary alignment problems
with other architectures, or depending on the current behaviour of
gcc that will likely change in the future just to tick us kernel developers
off a little more.
The __syscall_metadata section is also moved into the .init.data section
as it is now only needed at boot up.
Suggested-by: David Miller <davem@davemloft.net>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-02-03 06:06:09 +08:00
|
|
|
struct syscall_metadata **start;
|
|
|
|
struct syscall_metadata **stop;
|
2009-09-19 12:50:42 +08:00
|
|
|
char str[KSYM_SYMBOL_LEN];
|
|
|
|
|
|
|
|
|
tracing: Replace syscall_meta_data struct array with pointer array
Currently the syscall_meta structures for the syscall tracepoints are
placed in the __syscall_metadata section, and at link time, the linker
makes one large array of all these syscall metadata structures. On boot
up, this array is read (much like the initcall sections) and the syscall
data is processed.
The problem is that there is no guarantee that gcc will place complex
structures nicely together in an array format. Two structures in the
same file may be placed awkwardly, because gcc has no clue that they
are suppose to be in an array.
A hack was used previous to force the alignment to 4, to pack the
structures together. But this caused alignment issues with other
architectures (sparc).
Instead of packing the structures into an array, the structures' addresses
are now put into the __syscall_metadata section. As pointers are always the
natural alignment, gcc should always pack them tightly together
(otherwise initcall, extable, etc would also fail).
By having the pointers to the structures in the section, we can still
iterate the trace_events without causing unnecessary alignment problems
with other architectures, or depending on the current behaviour of
gcc that will likely change in the future just to tick us kernel developers
off a little more.
The __syscall_metadata section is also moved into the .init.data section
as it is now only needed at boot up.
Suggested-by: David Miller <davem@davemloft.net>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-02-03 06:06:09 +08:00
|
|
|
start = __start_syscalls_metadata;
|
|
|
|
stop = __stop_syscalls_metadata;
|
2009-09-19 12:50:42 +08:00
|
|
|
kallsyms_lookup(syscall, NULL, NULL, NULL, str);
|
|
|
|
|
2011-02-03 11:27:25 +08:00
|
|
|
if (arch_syscall_match_sym_name(str, "sys_ni_syscall"))
|
|
|
|
return NULL;
|
|
|
|
|
2009-09-19 12:50:42 +08:00
|
|
|
for ( ; start < stop; start++) {
|
2011-02-03 11:27:23 +08:00
|
|
|
if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
|
tracing: Replace syscall_meta_data struct array with pointer array
Currently the syscall_meta structures for the syscall tracepoints are
placed in the __syscall_metadata section, and at link time, the linker
makes one large array of all these syscall metadata structures. On boot
up, this array is read (much like the initcall sections) and the syscall
data is processed.
The problem is that there is no guarantee that gcc will place complex
structures nicely together in an array format. Two structures in the
same file may be placed awkwardly, because gcc has no clue that they
are suppose to be in an array.
A hack was used previous to force the alignment to 4, to pack the
structures together. But this caused alignment issues with other
architectures (sparc).
Instead of packing the structures into an array, the structures' addresses
are now put into the __syscall_metadata section. As pointers are always the
natural alignment, gcc should always pack them tightly together
(otherwise initcall, extable, etc would also fail).
By having the pointers to the structures in the section, we can still
iterate the trace_events without causing unnecessary alignment problems
with other architectures, or depending on the current behaviour of
gcc that will likely change in the future just to tick us kernel developers
off a little more.
The __syscall_metadata section is also moved into the .init.data section
as it is now only needed at boot up.
Suggested-by: David Miller <davem@davemloft.net>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-02-03 06:06:09 +08:00
|
|
|
return *start;
|
2009-09-19 12:50:42 +08:00
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct syscall_metadata *syscall_nr_to_meta(int nr)
|
|
|
|
{
|
2019-11-16 07:44:42 +08:00
|
|
|
if (IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR))
|
|
|
|
return xa_load(&syscalls_metadata_sparse, (unsigned long)nr);
|
|
|
|
|
2009-09-19 12:50:42 +08:00
|
|
|
if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return syscalls_metadata[nr];
|
|
|
|
}
|
|
|
|
|
2015-12-11 02:50:46 +08:00
|
|
|
const char *get_syscall_name(int syscall)
|
|
|
|
{
|
|
|
|
struct syscall_metadata *entry;
|
|
|
|
|
|
|
|
entry = syscall_nr_to_meta(syscall);
|
|
|
|
if (!entry)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return entry->name;
|
|
|
|
}
|
|
|
|
|
2012-11-21 15:13:47 +08:00
|
|
|
static enum print_line_t
|
2010-04-23 06:46:14 +08:00
|
|
|
print_syscall_enter(struct trace_iterator *iter, int flags,
|
|
|
|
struct trace_event *event)
|
2009-03-13 22:42:11 +08:00
|
|
|
{
|
2015-09-30 21:42:05 +08:00
|
|
|
struct trace_array *tr = iter->tr;
|
2009-03-13 22:42:11 +08:00
|
|
|
struct trace_seq *s = &iter->seq;
|
|
|
|
struct trace_entry *ent = iter->ent;
|
|
|
|
struct syscall_trace_enter *trace;
|
|
|
|
struct syscall_metadata *entry;
|
2014-11-13 06:41:33 +08:00
|
|
|
int i, syscall;
|
2009-03-13 22:42:11 +08:00
|
|
|
|
2009-08-11 04:52:53 +08:00
|
|
|
trace = (typeof(trace))ent;
|
2009-03-13 22:42:11 +08:00
|
|
|
syscall = trace->nr;
|
|
|
|
entry = syscall_nr_to_meta(syscall);
|
2009-08-11 04:52:53 +08:00
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
if (!entry)
|
|
|
|
goto end;
|
|
|
|
|
2010-04-23 22:38:03 +08:00
|
|
|
if (entry->enter_event->event.type != ent->type) {
|
2009-08-11 04:52:53 +08:00
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
goto end;
|
|
|
|
}
|
|
|
|
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_printf(s, "%s(", entry->name);
|
2009-03-13 22:42:11 +08:00
|
|
|
|
|
|
|
for (i = 0; i < entry->nb_args; i++) {
|
2014-11-13 06:41:33 +08:00
|
|
|
|
|
|
|
if (trace_seq_has_overflowed(s))
|
|
|
|
goto end;
|
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
/* parameter types */
|
2022-04-10 22:50:25 +08:00
|
|
|
if (tr && tr->trace_flags & TRACE_ITER_VERBOSE)
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_printf(s, "%s ", entry->types[i]);
|
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
/* parameter values */
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_printf(s, "%s: %lx%s", entry->args[i],
|
|
|
|
trace->args[i],
|
|
|
|
i == entry->nb_args - 1 ? "" : ", ");
|
2009-03-13 22:42:11 +08:00
|
|
|
}
|
|
|
|
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_putc(s, ')');
|
2009-03-13 22:42:11 +08:00
|
|
|
end:
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_putc(s, '\n');
|
2009-08-20 16:13:35 +08:00
|
|
|
|
2014-11-13 06:41:33 +08:00
|
|
|
return trace_handle_return(s);
|
2009-03-13 22:42:11 +08:00
|
|
|
}
|
|
|
|
|
2012-11-21 15:13:47 +08:00
|
|
|
static enum print_line_t
|
2010-04-23 06:46:14 +08:00
|
|
|
print_syscall_exit(struct trace_iterator *iter, int flags,
|
|
|
|
struct trace_event *event)
|
2009-03-13 22:42:11 +08:00
|
|
|
{
|
|
|
|
struct trace_seq *s = &iter->seq;
|
|
|
|
struct trace_entry *ent = iter->ent;
|
|
|
|
struct syscall_trace_exit *trace;
|
|
|
|
int syscall;
|
|
|
|
struct syscall_metadata *entry;
|
|
|
|
|
2009-08-11 04:52:53 +08:00
|
|
|
trace = (typeof(trace))ent;
|
2009-03-13 22:42:11 +08:00
|
|
|
syscall = trace->nr;
|
|
|
|
entry = syscall_nr_to_meta(syscall);
|
2009-08-11 04:52:53 +08:00
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
if (!entry) {
|
2013-07-15 16:32:44 +08:00
|
|
|
trace_seq_putc(s, '\n');
|
2014-11-13 06:41:33 +08:00
|
|
|
goto out;
|
2009-03-13 22:42:11 +08:00
|
|
|
}
|
|
|
|
|
2010-04-23 22:38:03 +08:00
|
|
|
if (entry->exit_event->event.type != ent->type) {
|
2009-08-11 04:52:53 +08:00
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
return TRACE_TYPE_UNHANDLED;
|
|
|
|
}
|
|
|
|
|
2014-11-13 06:41:33 +08:00
|
|
|
trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
|
2009-03-13 22:42:11 +08:00
|
|
|
trace->ret);
|
|
|
|
|
2014-11-13 06:41:33 +08:00
|
|
|
out:
|
|
|
|
return trace_handle_return(s);
|
2009-03-13 22:42:11 +08:00
|
|
|
}
|
|
|
|
|
2009-08-19 15:52:25 +08:00
|
|
|
extern char *__bad_type_size(void);
|
|
|
|
|
2019-10-25 04:26:59 +08:00
|
|
|
#define SYSCALL_FIELD(_type, _name) { \
|
|
|
|
.type = #_type, .name = #_name, \
|
|
|
|
.size = sizeof(_type), .align = __alignof__(_type), \
|
|
|
|
.is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }
|
2009-08-19 15:52:25 +08:00
|
|
|
|
2013-03-27 14:15:37 +08:00
|
|
|
static int __init
|
|
|
|
__set_enter_print_fmt(struct syscall_metadata *entry, char *buf, int len)
|
2009-12-15 15:39:45 +08:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int pos = 0;
|
|
|
|
|
|
|
|
/* When len=0, we just calculate the needed length */
|
|
|
|
#define LEN_OR_ZERO (len ? len - pos : 0)
|
|
|
|
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
|
|
|
|
for (i = 0; i < entry->nb_args; i++) {
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "%s: 0x%%0%zulx%s",
|
|
|
|
entry->args[i], sizeof(unsigned long),
|
|
|
|
i == entry->nb_args - 1 ? "" : ", ");
|
|
|
|
}
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
|
|
|
|
|
|
|
|
for (i = 0; i < entry->nb_args; i++) {
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO,
|
|
|
|
", ((unsigned long)(REC->%s))", entry->args[i]);
|
|
|
|
}
|
|
|
|
|
|
|
|
#undef LEN_OR_ZERO
|
|
|
|
|
|
|
|
/* return the length of print_fmt */
|
|
|
|
return pos;
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int __init set_syscall_print_fmt(struct trace_event_call *call)
|
2009-12-15 15:39:45 +08:00
|
|
|
{
|
|
|
|
char *print_fmt;
|
|
|
|
int len;
|
|
|
|
struct syscall_metadata *entry = call->data;
|
|
|
|
|
|
|
|
if (entry->enter_event != call) {
|
|
|
|
call->print_fmt = "\"0x%lx\", REC->ret";
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* First: called with 0 length to calculate the needed length */
|
|
|
|
len = __set_enter_print_fmt(entry, NULL, 0);
|
|
|
|
|
|
|
|
print_fmt = kmalloc(len + 1, GFP_KERNEL);
|
|
|
|
if (!print_fmt)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* Second: actually write the @print_fmt */
|
|
|
|
__set_enter_print_fmt(entry, print_fmt, len + 1);
|
|
|
|
call->print_fmt = print_fmt;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static void __init free_syscall_print_fmt(struct trace_event_call *call)
|
2009-12-15 15:39:45 +08:00
|
|
|
{
|
|
|
|
struct syscall_metadata *entry = call->data;
|
|
|
|
|
|
|
|
if (entry->enter_event == call)
|
|
|
|
kfree(call->print_fmt);
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int __init syscall_enter_define_fields(struct trace_event_call *call)
|
2009-08-19 15:54:51 +08:00
|
|
|
{
|
|
|
|
struct syscall_trace_enter trace;
|
2009-12-01 16:23:30 +08:00
|
|
|
struct syscall_metadata *meta = call->data;
|
2009-08-19 15:54:51 +08:00
|
|
|
int offset = offsetof(typeof(trace), args);
|
2020-01-08 21:57:55 +08:00
|
|
|
int ret = 0;
|
|
|
|
int i;
|
2009-11-26 15:49:33 +08:00
|
|
|
|
2009-08-19 15:54:51 +08:00
|
|
|
for (i = 0; i < meta->nb_args; i++) {
|
2009-08-27 11:09:51 +08:00
|
|
|
ret = trace_define_field(call, meta->types[i],
|
|
|
|
meta->args[i], offset,
|
2009-08-07 10:33:22 +08:00
|
|
|
sizeof(unsigned long), 0,
|
|
|
|
FILTER_OTHER);
|
2019-10-25 04:26:59 +08:00
|
|
|
if (ret)
|
|
|
|
break;
|
2009-08-19 15:54:51 +08:00
|
|
|
offset += sizeof(unsigned long);
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-08-09 02:48:20 +08:00
|
|
|
static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
|
2009-03-07 12:52:59 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = data;
|
2015-05-05 22:09:53 +08:00
|
|
|
struct trace_event_file *trace_file;
|
2009-03-13 22:42:11 +08:00
|
|
|
struct syscall_trace_enter *entry;
|
|
|
|
struct syscall_metadata *sys_data;
|
2022-04-10 22:50:25 +08:00
|
|
|
struct trace_event_buffer fbuffer;
|
2016-11-08 05:26:36 +08:00
|
|
|
unsigned long args[6];
|
2009-03-07 12:52:59 +08:00
|
|
|
int syscall_nr;
|
tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
int size;
|
2009-03-07 12:52:59 +08:00
|
|
|
|
tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
syscall_nr = trace_get_syscall_nr(current, regs);
|
tracing/syscalls: Ignore numbers outside NR_syscalls' range
ARM has some private syscalls (for example, set_tls(2)) which lie
outside the range of NR_syscalls. If any of these are called while
syscall tracing is being performed, out-of-bounds array access will
occur in the ftrace and perf sys_{enter,exit} handlers.
# trace-cmd record -e raw_syscalls:* true && trace-cmd report
...
true-653 [000] 384.675777: sys_enter: NR 192 (0, 1000, 3, 4000022, ffffffff, 0)
true-653 [000] 384.675812: sys_exit: NR 192 = 1995915264
true-653 [000] 384.675971: sys_enter: NR 983045 (76f74480, 76f74000, 76f74b28, 76f74480, 76f76f74, 1)
true-653 [000] 384.675988: sys_exit: NR 983045 = 0
...
# trace-cmd record -e syscalls:* true
[ 17.289329] Unable to handle kernel paging request at virtual address aaaaaace
[ 17.289590] pgd = 9e71c000
[ 17.289696] [aaaaaace] *pgd=00000000
[ 17.289985] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 17.290169] Modules linked in:
[ 17.290391] CPU: 0 PID: 704 Comm: true Not tainted 3.18.0-rc2+ #21
[ 17.290585] task: 9f4dab00 ti: 9e710000 task.ti: 9e710000
[ 17.290747] PC is at ftrace_syscall_enter+0x48/0x1f8
[ 17.290866] LR is at syscall_trace_enter+0x124/0x184
Fix this by ignoring out-of-NR_syscalls-bounds syscall numbers.
Commit cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
added the check for less than zero, but it should have also checked
for greater than NR_syscalls.
Link: http://lkml.kernel.org/p/1414620418-29472-1-git-send-email-rabin@rab.in
Fixes: cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
Cc: stable@vger.kernel.org # 2.6.33+
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-10-30 06:06:58 +08:00
|
|
|
if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
|
tracing: Check invalid syscall nr while tracing syscalls
Most arch syscall_get_nr() implementations returns -1 if the syscall
number is not valid. Accessing the bit field without a check might
result in a kernel oops (at least I saw it on s390 for ftrace selftest).
Before this change, this problem did not occur, because the invalid
syscall number (-1) caused syscall_nr_to_meta() to return NULL.
There are at least two scenarios where syscall_get_nr() can return -1:
1. For example, ptrace stores an invalid syscall number, and thus,
tracing code resets it.
(see do_syscall_trace_enter in arch/s390/kernel/ptrace.c)
2. The syscall_regfunc() (kernel/tracepoint.c) sets the
TIF_SYSCALL_FTRACE (now: TIF_SYSCALL_TRACEPOINT) flag for all threads
which include kernel threads.
However, the ftrace selftest triggers a kernel oops when testing
syscall trace points:
- The kernel thread is started as ususal (do_fork()),
- tracing code sets TIF_SYSCALL_FTRACE,
- the ret_from_fork() function is triggered and starts
ftrace_syscall_exit() with an invalid syscall number.
To avoid these scenarios, I suggest to check the syscall_nr.
For instance, the ftrace selftest fails for s390 (with config option
CONFIG_FTRACE_SYSCALLS set) and produces the following kernel oops.
Unable to handle kernel pointer dereference at virtual kernel address 2000000000
Oops: 0038 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 Not tainted 2.6.31-rc6-next-20090819-dirty #18
Process kthreadd (pid: 818, task: 000000003ea207e8, ksp: 000000003e813eb8)
Krnl PSW : 0704100180000000 00000000000ea54c (ftrace_syscall_exit+0x58/0xdc)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3
Krnl GPRS: 0000000000000000 00000000000e0000 ffffffffffffffff 20000000008c2650
0000000000000007 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 ffffffffffffffff 000000003e813d78
000000003e813f58 0000000000505ba8 000000003e813e18 000000003e813d78
Krnl Code: 00000000000ea540: e330d0000008 ag %r3,0(%r13)
00000000000ea546: a7480007 lhi %r4,7
00000000000ea54a: 1442 nr %r4,%r2
>00000000000ea54c: e31030000090 llgc %r1,0(%r3)
00000000000ea552: 5410d008 n %r1,8(%r13)
00000000000ea556: 8a104000 sra %r1,0(%r4)
00000000000ea55a: 5410d00c n %r1,12(%r13)
00000000000ea55e: 1211 ltr %r1,%r1
Call Trace:
([<0000000000000000>] 0x0)
[<000000000001fa22>] do_syscall_trace_exit+0x132/0x18c
[<000000000002d0c4>] sysc_return+0x0/0x8
[<000000000001c738>] kernel_thread_starter+0x0/0xc
Last Breaking-Event-Address:
[<00000000000ea51e>] ftrace_syscall_exit+0x2a/0xdc
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
LKML-Reference: <20090825125027.GE4639@cetus.boeblingen.de.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-08-25 20:50:27 +08:00
|
|
|
return;
|
2013-10-24 21:34:19 +08:00
|
|
|
|
|
|
|
/* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE) */
|
2015-05-05 22:09:53 +08:00
|
|
|
trace_file = rcu_dereference_sched(tr->enter_syscall_files[syscall_nr]);
|
|
|
|
if (!trace_file)
|
2013-10-24 21:34:19 +08:00
|
|
|
return;
|
|
|
|
|
2015-05-14 03:21:25 +08:00
|
|
|
if (trace_trigger_soft_disabled(trace_file))
|
2014-01-07 10:32:10 +08:00
|
|
|
return;
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
sys_data = syscall_nr_to_meta(syscall_nr);
|
|
|
|
if (!sys_data)
|
|
|
|
return;
|
|
|
|
|
|
|
|
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
|
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
entry = trace_event_buffer_reserve(&fbuffer, trace_file, size);
|
|
|
|
if (!entry)
|
2009-03-13 22:42:11 +08:00
|
|
|
return;
|
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
entry = ring_buffer_event_data(fbuffer.event);
|
2009-03-13 22:42:11 +08:00
|
|
|
entry->nr = syscall_nr;
|
2016-11-08 05:26:37 +08:00
|
|
|
syscall_get_arguments(current, regs, args);
|
2016-11-08 05:26:36 +08:00
|
|
|
memcpy(entry->args, args, sizeof(unsigned long) * sys_data->nb_args);
|
2009-03-13 22:42:11 +08:00
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
trace_event_buffer_commit(&fbuffer);
|
2009-03-07 12:52:59 +08:00
|
|
|
}
|
|
|
|
|
2012-08-09 02:48:20 +08:00
|
|
|
static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
|
2009-03-07 12:52:59 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = data;
|
2015-05-05 22:09:53 +08:00
|
|
|
struct trace_event_file *trace_file;
|
2009-03-13 22:42:11 +08:00
|
|
|
struct syscall_trace_exit *entry;
|
|
|
|
struct syscall_metadata *sys_data;
|
2022-04-10 22:50:25 +08:00
|
|
|
struct trace_event_buffer fbuffer;
|
2009-03-07 12:52:59 +08:00
|
|
|
int syscall_nr;
|
|
|
|
|
tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
syscall_nr = trace_get_syscall_nr(current, regs);
|
tracing/syscalls: Ignore numbers outside NR_syscalls' range
ARM has some private syscalls (for example, set_tls(2)) which lie
outside the range of NR_syscalls. If any of these are called while
syscall tracing is being performed, out-of-bounds array access will
occur in the ftrace and perf sys_{enter,exit} handlers.
# trace-cmd record -e raw_syscalls:* true && trace-cmd report
...
true-653 [000] 384.675777: sys_enter: NR 192 (0, 1000, 3, 4000022, ffffffff, 0)
true-653 [000] 384.675812: sys_exit: NR 192 = 1995915264
true-653 [000] 384.675971: sys_enter: NR 983045 (76f74480, 76f74000, 76f74b28, 76f74480, 76f76f74, 1)
true-653 [000] 384.675988: sys_exit: NR 983045 = 0
...
# trace-cmd record -e syscalls:* true
[ 17.289329] Unable to handle kernel paging request at virtual address aaaaaace
[ 17.289590] pgd = 9e71c000
[ 17.289696] [aaaaaace] *pgd=00000000
[ 17.289985] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 17.290169] Modules linked in:
[ 17.290391] CPU: 0 PID: 704 Comm: true Not tainted 3.18.0-rc2+ #21
[ 17.290585] task: 9f4dab00 ti: 9e710000 task.ti: 9e710000
[ 17.290747] PC is at ftrace_syscall_enter+0x48/0x1f8
[ 17.290866] LR is at syscall_trace_enter+0x124/0x184
Fix this by ignoring out-of-NR_syscalls-bounds syscall numbers.
Commit cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
added the check for less than zero, but it should have also checked
for greater than NR_syscalls.
Link: http://lkml.kernel.org/p/1414620418-29472-1-git-send-email-rabin@rab.in
Fixes: cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
Cc: stable@vger.kernel.org # 2.6.33+
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-10-30 06:06:58 +08:00
|
|
|
if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
|
tracing: Check invalid syscall nr while tracing syscalls
Most arch syscall_get_nr() implementations returns -1 if the syscall
number is not valid. Accessing the bit field without a check might
result in a kernel oops (at least I saw it on s390 for ftrace selftest).
Before this change, this problem did not occur, because the invalid
syscall number (-1) caused syscall_nr_to_meta() to return NULL.
There are at least two scenarios where syscall_get_nr() can return -1:
1. For example, ptrace stores an invalid syscall number, and thus,
tracing code resets it.
(see do_syscall_trace_enter in arch/s390/kernel/ptrace.c)
2. The syscall_regfunc() (kernel/tracepoint.c) sets the
TIF_SYSCALL_FTRACE (now: TIF_SYSCALL_TRACEPOINT) flag for all threads
which include kernel threads.
However, the ftrace selftest triggers a kernel oops when testing
syscall trace points:
- The kernel thread is started as ususal (do_fork()),
- tracing code sets TIF_SYSCALL_FTRACE,
- the ret_from_fork() function is triggered and starts
ftrace_syscall_exit() with an invalid syscall number.
To avoid these scenarios, I suggest to check the syscall_nr.
For instance, the ftrace selftest fails for s390 (with config option
CONFIG_FTRACE_SYSCALLS set) and produces the following kernel oops.
Unable to handle kernel pointer dereference at virtual kernel address 2000000000
Oops: 0038 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 Not tainted 2.6.31-rc6-next-20090819-dirty #18
Process kthreadd (pid: 818, task: 000000003ea207e8, ksp: 000000003e813eb8)
Krnl PSW : 0704100180000000 00000000000ea54c (ftrace_syscall_exit+0x58/0xdc)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3
Krnl GPRS: 0000000000000000 00000000000e0000 ffffffffffffffff 20000000008c2650
0000000000000007 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 ffffffffffffffff 000000003e813d78
000000003e813f58 0000000000505ba8 000000003e813e18 000000003e813d78
Krnl Code: 00000000000ea540: e330d0000008 ag %r3,0(%r13)
00000000000ea546: a7480007 lhi %r4,7
00000000000ea54a: 1442 nr %r4,%r2
>00000000000ea54c: e31030000090 llgc %r1,0(%r3)
00000000000ea552: 5410d008 n %r1,8(%r13)
00000000000ea556: 8a104000 sra %r1,0(%r4)
00000000000ea55a: 5410d00c n %r1,12(%r13)
00000000000ea55e: 1211 ltr %r1,%r1
Call Trace:
([<0000000000000000>] 0x0)
[<000000000001fa22>] do_syscall_trace_exit+0x132/0x18c
[<000000000002d0c4>] sysc_return+0x0/0x8
[<000000000001c738>] kernel_thread_starter+0x0/0xc
Last Breaking-Event-Address:
[<00000000000ea51e>] ftrace_syscall_exit+0x2a/0xdc
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
LKML-Reference: <20090825125027.GE4639@cetus.boeblingen.de.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-08-25 20:50:27 +08:00
|
|
|
return;
|
2013-10-24 21:34:19 +08:00
|
|
|
|
|
|
|
/* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE()) */
|
2015-05-05 22:09:53 +08:00
|
|
|
trace_file = rcu_dereference_sched(tr->exit_syscall_files[syscall_nr]);
|
|
|
|
if (!trace_file)
|
2013-10-24 21:34:19 +08:00
|
|
|
return;
|
|
|
|
|
2015-05-14 03:21:25 +08:00
|
|
|
if (trace_trigger_soft_disabled(trace_file))
|
2014-01-07 10:32:10 +08:00
|
|
|
return;
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2009-03-13 22:42:11 +08:00
|
|
|
sys_data = syscall_nr_to_meta(syscall_nr);
|
|
|
|
if (!sys_data)
|
|
|
|
return;
|
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
entry = trace_event_buffer_reserve(&fbuffer, trace_file, sizeof(*entry));
|
|
|
|
if (!entry)
|
2009-03-13 22:42:11 +08:00
|
|
|
return;
|
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
entry = ring_buffer_event_data(fbuffer.event);
|
2009-03-13 22:42:11 +08:00
|
|
|
entry->nr = syscall_nr;
|
|
|
|
entry->ret = syscall_get_return_value(current, regs);
|
|
|
|
|
2022-04-10 22:50:25 +08:00
|
|
|
trace_event_buffer_commit(&fbuffer);
|
2009-03-07 12:52:59 +08:00
|
|
|
}
|
|
|
|
|
2015-05-05 22:09:53 +08:00
|
|
|
static int reg_event_syscall_enter(struct trace_event_file *file,
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_call *call)
|
2009-03-07 12:52:59 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = file->tr;
|
2009-08-11 04:52:47 +08:00
|
|
|
int ret = 0;
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:23:47 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2011-02-03 11:27:21 +08:00
|
|
|
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
|
2009-08-11 04:52:47 +08:00
|
|
|
return -ENOSYS;
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2012-08-09 02:48:20 +08:00
|
|
|
if (!tr->sys_refcount_enter)
|
|
|
|
ret = register_trace_sys_enter(ftrace_syscall_enter, tr);
|
2009-12-08 11:14:52 +08:00
|
|
|
if (!ret) {
|
2013-10-24 21:34:19 +08:00
|
|
|
rcu_assign_pointer(tr->enter_syscall_files[num], file);
|
2012-08-09 02:48:20 +08:00
|
|
|
tr->sys_refcount_enter++;
|
2009-08-11 04:52:47 +08:00
|
|
|
}
|
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
return ret;
|
2009-03-07 12:52:59 +08:00
|
|
|
}
|
|
|
|
|
2015-05-05 22:09:53 +08:00
|
|
|
static void unreg_event_syscall_enter(struct trace_event_file *file,
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_call *call)
|
2009-03-07 12:52:59 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = file->tr;
|
2009-08-11 04:52:47 +08:00
|
|
|
int num;
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2009-12-01 16:23:47 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2011-02-03 11:27:21 +08:00
|
|
|
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
|
2009-08-11 04:52:47 +08:00
|
|
|
return;
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2012-08-09 02:48:20 +08:00
|
|
|
tr->sys_refcount_enter--;
|
2014-08-22 22:28:22 +08:00
|
|
|
RCU_INIT_POINTER(tr->enter_syscall_files[num], NULL);
|
2012-08-09 02:48:20 +08:00
|
|
|
if (!tr->sys_refcount_enter)
|
|
|
|
unregister_trace_sys_enter(ftrace_syscall_enter, tr);
|
2009-08-11 04:52:47 +08:00
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
}
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2015-05-05 22:09:53 +08:00
|
|
|
static int reg_event_syscall_exit(struct trace_event_file *file,
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_call *call)
|
2009-03-07 12:52:59 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = file->tr;
|
2009-08-11 04:52:47 +08:00
|
|
|
int ret = 0;
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:23:47 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2011-02-03 11:27:21 +08:00
|
|
|
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
|
2009-08-11 04:52:47 +08:00
|
|
|
return -ENOSYS;
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2012-08-09 02:48:20 +08:00
|
|
|
if (!tr->sys_refcount_exit)
|
|
|
|
ret = register_trace_sys_exit(ftrace_syscall_exit, tr);
|
2009-12-08 11:14:52 +08:00
|
|
|
if (!ret) {
|
2013-10-24 21:34:19 +08:00
|
|
|
rcu_assign_pointer(tr->exit_syscall_files[num], file);
|
2012-08-09 02:48:20 +08:00
|
|
|
tr->sys_refcount_exit++;
|
2009-03-07 12:52:59 +08:00
|
|
|
}
|
2009-08-11 04:52:47 +08:00
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2015-05-05 22:09:53 +08:00
|
|
|
static void unreg_event_syscall_exit(struct trace_event_file *file,
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_call *call)
|
2009-08-11 04:52:47 +08:00
|
|
|
{
|
2012-08-09 02:48:20 +08:00
|
|
|
struct trace_array *tr = file->tr;
|
2009-08-11 04:52:47 +08:00
|
|
|
int num;
|
2009-03-07 12:52:59 +08:00
|
|
|
|
2009-12-01 16:23:47 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2011-02-03 11:27:21 +08:00
|
|
|
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
|
2009-08-11 04:52:47 +08:00
|
|
|
return;
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2012-08-09 02:48:20 +08:00
|
|
|
tr->sys_refcount_exit--;
|
2014-08-22 22:28:22 +08:00
|
|
|
RCU_INIT_POINTER(tr->exit_syscall_files[num], NULL);
|
2012-08-09 02:48:20 +08:00
|
|
|
if (!tr->sys_refcount_exit)
|
|
|
|
unregister_trace_sys_exit(ftrace_syscall_exit, tr);
|
2009-08-11 04:52:47 +08:00
|
|
|
mutex_unlock(&syscall_trace_lock);
|
2009-03-07 12:52:59 +08:00
|
|
|
}
|
2009-08-11 04:52:47 +08:00
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int __init init_syscall_trace(struct trace_event_call *call)
|
2009-12-01 16:23:55 +08:00
|
|
|
{
|
|
|
|
int id;
|
2011-02-03 11:27:20 +08:00
|
|
|
int num;
|
|
|
|
|
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
|
|
|
if (num < 0 || num >= NR_syscalls) {
|
|
|
|
pr_debug("syscall %s metadata not mapped, disabling ftrace event\n",
|
|
|
|
((struct syscall_metadata *)call->data)->name);
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
2009-12-01 16:23:55 +08:00
|
|
|
|
2009-12-15 15:39:45 +08:00
|
|
|
if (set_syscall_print_fmt(call) < 0)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2009-12-29 10:13:59 +08:00
|
|
|
id = trace_event_raw_init(call);
|
|
|
|
|
|
|
|
if (id < 0) {
|
2009-12-15 15:39:45 +08:00
|
|
|
free_syscall_print_fmt(call);
|
2009-12-29 10:13:59 +08:00
|
|
|
return id;
|
2009-12-15 15:39:45 +08:00
|
|
|
}
|
2009-12-29 10:13:59 +08:00
|
|
|
|
|
|
|
return id;
|
2009-12-01 16:23:55 +08:00
|
|
|
}
|
|
|
|
|
2019-10-25 04:26:59 +08:00
|
|
|
static struct trace_event_fields __refdata syscall_enter_fields_array[] = {
|
|
|
|
SYSCALL_FIELD(int, __syscall_nr),
|
|
|
|
{ .type = TRACE_FUNCTION_TYPE,
|
|
|
|
.define_fields = syscall_enter_define_fields },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
2012-06-08 07:46:25 +08:00
|
|
|
struct trace_event_functions enter_syscall_print_funcs = {
|
|
|
|
.trace = print_syscall_enter,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct trace_event_functions exit_syscall_print_funcs = {
|
|
|
|
.trace = print_syscall_exit,
|
|
|
|
};
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_class __refdata event_class_syscall_enter = {
|
2012-06-08 07:46:25 +08:00
|
|
|
.system = "syscalls",
|
|
|
|
.reg = syscall_enter_register,
|
2019-10-25 04:26:59 +08:00
|
|
|
.fields_array = syscall_enter_fields_array,
|
2012-06-08 07:46:25 +08:00
|
|
|
.get_fields = syscall_get_enter_fields,
|
|
|
|
.raw_init = init_syscall_trace,
|
|
|
|
};
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
struct trace_event_class __refdata event_class_syscall_exit = {
|
2012-06-08 07:46:25 +08:00
|
|
|
.system = "syscalls",
|
|
|
|
.reg = syscall_exit_register,
|
2019-10-25 04:26:59 +08:00
|
|
|
.fields_array = (struct trace_event_fields[]){
|
|
|
|
SYSCALL_FIELD(int, __syscall_nr),
|
|
|
|
SYSCALL_FIELD(long, ret),
|
|
|
|
{}
|
|
|
|
},
|
2012-06-08 07:46:25 +08:00
|
|
|
.fields = LIST_HEAD_INIT(event_class_syscall_exit.fields),
|
|
|
|
.raw_init = init_syscall_trace,
|
|
|
|
};
|
|
|
|
|
2011-02-03 11:27:22 +08:00
|
|
|
unsigned long __init __weak arch_syscall_addr(int nr)
|
2010-01-26 17:40:03 +08:00
|
|
|
{
|
|
|
|
return (unsigned long)sys_call_table[nr];
|
|
|
|
}
|
|
|
|
|
2014-12-13 09:05:10 +08:00
|
|
|
void __init init_ftrace_syscalls(void)
|
2009-09-19 12:50:42 +08:00
|
|
|
{
|
|
|
|
struct syscall_metadata *meta;
|
|
|
|
unsigned long addr;
|
|
|
|
int i;
|
2019-11-16 07:44:42 +08:00
|
|
|
void *ret;
|
|
|
|
|
|
|
|
if (!IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR)) {
|
|
|
|
syscalls_metadata = kcalloc(NR_syscalls,
|
|
|
|
sizeof(*syscalls_metadata),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!syscalls_metadata) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return;
|
|
|
|
}
|
2009-09-19 12:50:42 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < NR_syscalls; i++) {
|
|
|
|
addr = arch_syscall_addr(i);
|
|
|
|
meta = find_syscall_meta(addr);
|
2009-12-01 16:23:47 +08:00
|
|
|
if (!meta)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
meta->syscall_nr = i;
|
2019-11-16 07:44:42 +08:00
|
|
|
|
|
|
|
if (!IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR)) {
|
|
|
|
syscalls_metadata[i] = meta;
|
|
|
|
} else {
|
|
|
|
ret = xa_store(&syscalls_metadata_sparse, i, meta,
|
|
|
|
GFP_KERNEL);
|
|
|
|
WARN(xa_is_err(ret),
|
|
|
|
"Syscall memory allocation failed\n");
|
|
|
|
}
|
|
|
|
|
2009-09-19 12:50:42 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-12-21 14:27:35 +08:00
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
2009-08-12 02:22:53 +08:00
|
|
|
|
2010-03-05 12:35:37 +08:00
|
|
|
static DECLARE_BITMAP(enabled_perf_enter_syscalls, NR_syscalls);
|
|
|
|
static DECLARE_BITMAP(enabled_perf_exit_syscalls, NR_syscalls);
|
|
|
|
static int sys_perf_refcount_enter;
|
|
|
|
static int sys_perf_refcount_exit;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
2017-10-24 14:53:08 +08:00
|
|
|
static int perf_call_bpf_enter(struct trace_event_call *call, struct pt_regs *regs,
|
|
|
|
struct syscall_metadata *sys_data,
|
|
|
|
struct syscall_trace_enter *rec)
|
|
|
|
{
|
2017-08-05 07:00:09 +08:00
|
|
|
struct syscall_tp_t {
|
|
|
|
unsigned long long regs;
|
|
|
|
unsigned long syscall_nr;
|
2017-09-08 09:36:15 +08:00
|
|
|
unsigned long args[SYSCALL_DEFINE_MAXARGS];
|
2017-08-05 07:00:09 +08:00
|
|
|
} param;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
*(struct pt_regs **)¶m = regs;
|
|
|
|
param.syscall_nr = rec->nr;
|
|
|
|
for (i = 0; i < sys_data->nb_args; i++)
|
|
|
|
param.args[i] = rec->args[i];
|
2017-10-24 14:53:08 +08:00
|
|
|
return trace_call_bpf(call, ¶m);
|
2017-08-05 07:00:09 +08:00
|
|
|
}
|
|
|
|
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
struct syscall_metadata *sys_data;
|
2009-09-18 12:10:28 +08:00
|
|
|
struct syscall_trace_enter *rec;
|
2010-05-19 20:02:22 +08:00
|
|
|
struct hlist_head *head;
|
2016-11-08 05:26:36 +08:00
|
|
|
unsigned long args[6];
|
2017-10-24 14:53:08 +08:00
|
|
|
bool valid_prog_array;
|
2009-08-11 04:53:02 +08:00
|
|
|
int syscall_nr;
|
2009-11-23 18:37:29 +08:00
|
|
|
int rctx;
|
2009-08-12 02:22:53 +08:00
|
|
|
int size;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
syscall_nr = trace_get_syscall_nr(current, regs);
|
tracing/syscalls: Ignore numbers outside NR_syscalls' range
ARM has some private syscalls (for example, set_tls(2)) which lie
outside the range of NR_syscalls. If any of these are called while
syscall tracing is being performed, out-of-bounds array access will
occur in the ftrace and perf sys_{enter,exit} handlers.
# trace-cmd record -e raw_syscalls:* true && trace-cmd report
...
true-653 [000] 384.675777: sys_enter: NR 192 (0, 1000, 3, 4000022, ffffffff, 0)
true-653 [000] 384.675812: sys_exit: NR 192 = 1995915264
true-653 [000] 384.675971: sys_enter: NR 983045 (76f74480, 76f74000, 76f74b28, 76f74480, 76f76f74, 1)
true-653 [000] 384.675988: sys_exit: NR 983045 = 0
...
# trace-cmd record -e syscalls:* true
[ 17.289329] Unable to handle kernel paging request at virtual address aaaaaace
[ 17.289590] pgd = 9e71c000
[ 17.289696] [aaaaaace] *pgd=00000000
[ 17.289985] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 17.290169] Modules linked in:
[ 17.290391] CPU: 0 PID: 704 Comm: true Not tainted 3.18.0-rc2+ #21
[ 17.290585] task: 9f4dab00 ti: 9e710000 task.ti: 9e710000
[ 17.290747] PC is at ftrace_syscall_enter+0x48/0x1f8
[ 17.290866] LR is at syscall_trace_enter+0x124/0x184
Fix this by ignoring out-of-NR_syscalls-bounds syscall numbers.
Commit cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
added the check for less than zero, but it should have also checked
for greater than NR_syscalls.
Link: http://lkml.kernel.org/p/1414620418-29472-1-git-send-email-rabin@rab.in
Fixes: cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
Cc: stable@vger.kernel.org # 2.6.33+
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-10-30 06:06:58 +08:00
|
|
|
if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
|
2012-08-17 01:14:14 +08:00
|
|
|
return;
|
2010-03-05 12:35:37 +08:00
|
|
|
if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
|
2009-08-11 04:53:02 +08:00
|
|
|
return;
|
|
|
|
|
|
|
|
sys_data = syscall_nr_to_meta(syscall_nr);
|
|
|
|
if (!sys_data)
|
|
|
|
return;
|
|
|
|
|
2013-06-18 01:02:07 +08:00
|
|
|
head = this_cpu_ptr(sys_data->enter_event->perf_events);
|
2017-10-24 14:53:08 +08:00
|
|
|
valid_prog_array = bpf_prog_array_valid(sys_data->enter_event);
|
|
|
|
if (!valid_prog_array && hlist_empty(head))
|
2013-06-18 01:02:07 +08:00
|
|
|
return;
|
|
|
|
|
2009-08-12 02:22:53 +08:00
|
|
|
/* get the size after alignment with the u32 buffer size field */
|
|
|
|
size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec);
|
|
|
|
size = ALIGN(size + sizeof(u32), sizeof(u64));
|
|
|
|
size -= sizeof(u32);
|
|
|
|
|
2016-04-07 09:43:24 +08:00
|
|
|
rec = perf_trace_buf_alloc(size, NULL, &rctx);
|
2010-01-28 09:32:29 +08:00
|
|
|
if (!rec)
|
|
|
|
return;
|
2009-09-18 12:10:28 +08:00
|
|
|
|
|
|
|
rec->nr = syscall_nr;
|
2016-11-08 05:26:37 +08:00
|
|
|
syscall_get_arguments(current, regs, args);
|
2016-11-08 05:26:36 +08:00
|
|
|
memcpy(&rec->args, args, sizeof(unsigned long) * sys_data->nb_args);
|
2017-08-05 07:00:09 +08:00
|
|
|
|
2017-10-24 14:53:08 +08:00
|
|
|
if ((valid_prog_array &&
|
|
|
|
!perf_call_bpf_enter(sys_data->enter_event, regs, sys_data, rec)) ||
|
2017-08-05 07:00:09 +08:00
|
|
|
hlist_empty(head)) {
|
|
|
|
perf_swevent_put_recursion_context(rctx);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2016-04-07 09:43:24 +08:00
|
|
|
perf_trace_buf_submit(rec, size, rctx,
|
|
|
|
sys_data->enter_event->event.type, 1, regs,
|
2017-10-11 15:45:29 +08:00
|
|
|
head, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int perf_sysenter_enable(struct trace_event_call *call)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:24:01 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2010-03-05 12:35:37 +08:00
|
|
|
if (!sys_perf_refcount_enter)
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
ret = register_trace_sys_enter(perf_syscall_enter, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
if (ret) {
|
2016-09-12 21:46:23 +08:00
|
|
|
pr_info("event trace: Could not activate syscall entry trace point");
|
2009-08-11 04:53:02 +08:00
|
|
|
} else {
|
2010-03-05 12:35:37 +08:00
|
|
|
set_bit(num, enabled_perf_enter_syscalls);
|
|
|
|
sys_perf_refcount_enter++;
|
2009-08-11 04:53:02 +08:00
|
|
|
}
|
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static void perf_sysenter_disable(struct trace_event_call *call)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:24:01 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2010-03-05 12:35:37 +08:00
|
|
|
sys_perf_refcount_enter--;
|
|
|
|
clear_bit(num, enabled_perf_enter_syscalls);
|
|
|
|
if (!sys_perf_refcount_enter)
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
unregister_trace_sys_enter(perf_syscall_enter, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
}
|
|
|
|
|
2017-10-24 14:53:08 +08:00
|
|
|
static int perf_call_bpf_exit(struct trace_event_call *call, struct pt_regs *regs,
|
|
|
|
struct syscall_trace_exit *rec)
|
|
|
|
{
|
2017-08-05 07:00:09 +08:00
|
|
|
struct syscall_tp_t {
|
|
|
|
unsigned long long regs;
|
|
|
|
unsigned long syscall_nr;
|
|
|
|
unsigned long ret;
|
|
|
|
} param;
|
|
|
|
|
|
|
|
*(struct pt_regs **)¶m = regs;
|
|
|
|
param.syscall_nr = rec->nr;
|
|
|
|
param.ret = rec->ret;
|
2017-10-24 14:53:08 +08:00
|
|
|
return trace_call_bpf(call, ¶m);
|
2017-08-05 07:00:09 +08:00
|
|
|
}
|
|
|
|
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
struct syscall_metadata *sys_data;
|
2009-09-18 12:10:28 +08:00
|
|
|
struct syscall_trace_exit *rec;
|
2010-05-19 20:02:22 +08:00
|
|
|
struct hlist_head *head;
|
2017-10-24 14:53:08 +08:00
|
|
|
bool valid_prog_array;
|
2009-08-11 04:53:02 +08:00
|
|
|
int syscall_nr;
|
2009-11-23 18:37:29 +08:00
|
|
|
int rctx;
|
2009-09-18 12:10:28 +08:00
|
|
|
int size;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
tracing/syscalls: Allow archs to ignore tracing compat syscalls
The tracing of ia32 compat system calls has been a bit of a pain as they
use different system call numbers than the 64bit equivalents.
I wrote a simple 'lls' program that lists files. I compiled it as a i686
ELF binary and ran it under a x86_64 box. This is the result:
echo 0 > /debug/tracing/tracing_on
echo 1 > /debug/tracing/events/syscalls/enable
echo 1 > /debug/tracing/tracing_on ; ./lls ; echo 0 > /debug/tracing/tracing_on
grep lls /debug/tracing/trace
[.. skipping calls before TS_COMPAT is set ...]
lls-1127 [005] d... 936.409188: sys_recvfrom(fd: 0, ubuf: 4d560fc4, size: 0, flags: 8048034, addr: 8, addr_len: f7700420)
lls-1127 [005] d... 936.409190: sys_recvfrom -> 0x8a77000
lls-1127 [005] d... 936.409211: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
lls-1127 [005] d... 936.409215: sys_lgetxattr -> 0xf76ff000
lls-1127 [005] d... 936.409223: sys_dup2(oldfd: 4d55ae9b, newfd: 4)
lls-1127 [005] d... 936.409228: sys_dup2 -> 0xfffffffffffffffe
lls-1127 [005] d... 936.409236: sys_newfstat(fd: 4d55b085, statbuf: 80000)
lls-1127 [005] d... 936.409242: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409243: sys_removexattr(pathname: 3, name: ffcd0060)
lls-1127 [005] d... 936.409244: sys_removexattr -> 0x0
lls-1127 [005] d... 936.409245: sys_lgetxattr(pathname: 0, name: 19614, value: 1, size: 2)
lls-1127 [005] d... 936.409248: sys_lgetxattr -> 0xf76e5000
lls-1127 [005] d... 936.409248: sys_newlstat(filename: 3, statbuf: 19614)
lls-1127 [005] d... 936.409249: sys_newlstat -> 0x0
lls-1127 [005] d... 936.409262: sys_newfstat(fd: f76fb588, statbuf: 80000)
lls-1127 [005] d... 936.409279: sys_newfstat -> 0x3
lls-1127 [005] d... 936.409279: sys_close(fd: 3)
lls-1127 [005] d... 936.421550: sys_close -> 0x200
lls-1127 [005] d... 936.421558: sys_removexattr(pathname: 3, name: ffcd00d0)
lls-1127 [005] d... 936.421560: sys_removexattr -> 0x0
lls-1127 [005] d... 936.421569: sys_lgetxattr(pathname: 4d564000, name: 1b1abc, value: 5, size: 802)
lls-1127 [005] d... 936.421574: sys_lgetxattr -> 0x4d564000
lls-1127 [005] d... 936.421575: sys_capget(header: 4d70f000, dataptr: 1000)
lls-1127 [005] d... 936.421580: sys_capget -> 0x0
lls-1127 [005] d... 936.421580: sys_lgetxattr(pathname: 4d710000, name: 3000, value: 3, size: 812)
lls-1127 [005] d... 936.421589: sys_lgetxattr -> 0x4d710000
lls-1127 [005] d... 936.426130: sys_lgetxattr(pathname: 4d713000, name: 2abc, value: 3, size: 32)
lls-1127 [005] d... 936.426141: sys_lgetxattr -> 0x4d713000
lls-1127 [005] d... 936.426145: sys_newlstat(filename: 3, statbuf: f76ff3f0)
lls-1127 [005] d... 936.426146: sys_newlstat -> 0x0
lls-1127 [005] d... 936.431748: sys_lgetxattr(pathname: 0, name: 1000, value: 3, size: 22)
Obviously I'm not calling newfstat with a fd of 4d55b085. The calls are
obviously incorrect, and confusing.
Other efforts have been made to fix this:
https://lkml.org/lkml/2012/3/26/367
But the real solution is to rewrite the syscall internals and come up
with a fixed solution. One that doesn't require all the kluge that the
current solution has.
Thus for now, instead of outputting incorrect data, simply ignore them.
With this patch the changes now have:
#> grep lls /debug/tracing/trace
#>
Compat system calls simply are not traced. If users need compat
syscalls, then they should just use the raw syscall tracepoints.
For an architecture to make their compat syscalls ignored, it must
define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS (done in asm/ftrace.h) and also
define an arch_trace_is_compat_syscall() function that will return true
if the current task should ignore tracing the syscall.
I want to stress that this change does not affect actual syscalls in any
way, shape or form. It is only used within the tracing system and
doesn't interfere with the syscall logic at all. The changes are
consolidated nicely into trace_syscalls.c and asm/ftrace.h.
I had to make one small modification to asm/thread_info.h and that was
to remove the include of asm/ftrace.h. As asm/ftrace.h required the
current_thread_info() it was causing include hell. That include was
added back in 2008 when the function graph tracer was added:
commit caf4b323 "tracing, x86: add low level support for ftrace return tracing"
It does not need to be included there.
Link: http://lkml.kernel.org/r/1360703939.21867.99.camel@gandalf.local.home
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-13 05:18:59 +08:00
|
|
|
syscall_nr = trace_get_syscall_nr(current, regs);
|
tracing/syscalls: Ignore numbers outside NR_syscalls' range
ARM has some private syscalls (for example, set_tls(2)) which lie
outside the range of NR_syscalls. If any of these are called while
syscall tracing is being performed, out-of-bounds array access will
occur in the ftrace and perf sys_{enter,exit} handlers.
# trace-cmd record -e raw_syscalls:* true && trace-cmd report
...
true-653 [000] 384.675777: sys_enter: NR 192 (0, 1000, 3, 4000022, ffffffff, 0)
true-653 [000] 384.675812: sys_exit: NR 192 = 1995915264
true-653 [000] 384.675971: sys_enter: NR 983045 (76f74480, 76f74000, 76f74b28, 76f74480, 76f76f74, 1)
true-653 [000] 384.675988: sys_exit: NR 983045 = 0
...
# trace-cmd record -e syscalls:* true
[ 17.289329] Unable to handle kernel paging request at virtual address aaaaaace
[ 17.289590] pgd = 9e71c000
[ 17.289696] [aaaaaace] *pgd=00000000
[ 17.289985] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 17.290169] Modules linked in:
[ 17.290391] CPU: 0 PID: 704 Comm: true Not tainted 3.18.0-rc2+ #21
[ 17.290585] task: 9f4dab00 ti: 9e710000 task.ti: 9e710000
[ 17.290747] PC is at ftrace_syscall_enter+0x48/0x1f8
[ 17.290866] LR is at syscall_trace_enter+0x124/0x184
Fix this by ignoring out-of-NR_syscalls-bounds syscall numbers.
Commit cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
added the check for less than zero, but it should have also checked
for greater than NR_syscalls.
Link: http://lkml.kernel.org/p/1414620418-29472-1-git-send-email-rabin@rab.in
Fixes: cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
Cc: stable@vger.kernel.org # 2.6.33+
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-10-30 06:06:58 +08:00
|
|
|
if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
|
2012-08-17 01:14:14 +08:00
|
|
|
return;
|
2010-03-05 12:35:37 +08:00
|
|
|
if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
|
2009-08-11 04:53:02 +08:00
|
|
|
return;
|
|
|
|
|
|
|
|
sys_data = syscall_nr_to_meta(syscall_nr);
|
|
|
|
if (!sys_data)
|
|
|
|
return;
|
|
|
|
|
2013-06-18 01:02:07 +08:00
|
|
|
head = this_cpu_ptr(sys_data->exit_event->perf_events);
|
2017-10-24 14:53:08 +08:00
|
|
|
valid_prog_array = bpf_prog_array_valid(sys_data->exit_event);
|
|
|
|
if (!valid_prog_array && hlist_empty(head))
|
2013-06-18 01:02:07 +08:00
|
|
|
return;
|
|
|
|
|
2009-09-18 12:10:28 +08:00
|
|
|
/* We can probably do that at build time */
|
|
|
|
size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64));
|
|
|
|
size -= sizeof(u32);
|
2009-08-12 02:22:53 +08:00
|
|
|
|
2016-04-07 09:43:24 +08:00
|
|
|
rec = perf_trace_buf_alloc(size, NULL, &rctx);
|
2010-01-28 09:32:29 +08:00
|
|
|
if (!rec)
|
|
|
|
return;
|
2009-09-18 12:10:28 +08:00
|
|
|
|
|
|
|
rec->nr = syscall_nr;
|
|
|
|
rec->ret = syscall_get_return_value(current, regs);
|
2017-08-05 07:00:09 +08:00
|
|
|
|
2017-10-24 14:53:08 +08:00
|
|
|
if ((valid_prog_array &&
|
|
|
|
!perf_call_bpf_exit(sys_data->exit_event, regs, rec)) ||
|
2017-08-05 07:00:09 +08:00
|
|
|
hlist_empty(head)) {
|
|
|
|
perf_swevent_put_recursion_context(rctx);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2016-04-07 09:43:24 +08:00
|
|
|
perf_trace_buf_submit(rec, size, rctx, sys_data->exit_event->event.type,
|
2017-10-11 15:45:29 +08:00
|
|
|
1, regs, head, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int perf_sysexit_enable(struct trace_event_call *call)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:24:01 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2010-03-05 12:35:37 +08:00
|
|
|
if (!sys_perf_refcount_exit)
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
ret = register_trace_sys_exit(perf_syscall_exit, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
if (ret) {
|
2016-09-12 21:46:23 +08:00
|
|
|
pr_info("event trace: Could not activate syscall exit trace point");
|
2009-08-11 04:53:02 +08:00
|
|
|
} else {
|
2010-03-05 12:35:37 +08:00
|
|
|
set_bit(num, enabled_perf_exit_syscalls);
|
|
|
|
sys_perf_refcount_exit++;
|
2009-08-11 04:53:02 +08:00
|
|
|
}
|
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static void perf_sysexit_disable(struct trace_event_call *call)
|
2009-08-11 04:53:02 +08:00
|
|
|
{
|
|
|
|
int num;
|
|
|
|
|
2009-12-01 16:24:01 +08:00
|
|
|
num = ((struct syscall_metadata *)call->data)->syscall_nr;
|
2009-08-11 04:53:02 +08:00
|
|
|
|
|
|
|
mutex_lock(&syscall_trace_lock);
|
2010-03-05 12:35:37 +08:00
|
|
|
sys_perf_refcount_exit--;
|
|
|
|
clear_bit(num, enabled_perf_exit_syscalls);
|
|
|
|
if (!sys_perf_refcount_exit)
|
tracing: Let tracepoints have data passed to tracepoint callbacks
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-04-21 05:04:50 +08:00
|
|
|
unregister_trace_sys_exit(perf_syscall_exit, NULL);
|
2009-08-11 04:53:02 +08:00
|
|
|
mutex_unlock(&syscall_trace_lock);
|
|
|
|
}
|
|
|
|
|
2009-12-21 14:27:35 +08:00
|
|
|
#endif /* CONFIG_PERF_EVENTS */
|
2009-08-11 04:53:02 +08:00
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int syscall_enter_register(struct trace_event_call *event,
|
2012-02-15 22:51:49 +08:00
|
|
|
enum trace_reg type, void *data)
|
2010-04-22 00:27:06 +08:00
|
|
|
{
|
2015-05-05 22:09:53 +08:00
|
|
|
struct trace_event_file *file = data;
|
2012-08-09 02:48:20 +08:00
|
|
|
|
2010-04-22 00:27:06 +08:00
|
|
|
switch (type) {
|
|
|
|
case TRACE_REG_REGISTER:
|
2012-08-09 02:48:20 +08:00
|
|
|
return reg_event_syscall_enter(file, event);
|
2010-04-22 00:27:06 +08:00
|
|
|
case TRACE_REG_UNREGISTER:
|
2012-08-09 02:48:20 +08:00
|
|
|
unreg_event_syscall_enter(file, event);
|
2010-04-22 00:27:06 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
case TRACE_REG_PERF_REGISTER:
|
|
|
|
return perf_sysenter_enable(event);
|
|
|
|
case TRACE_REG_PERF_UNREGISTER:
|
|
|
|
perf_sysenter_disable(event);
|
|
|
|
return 0;
|
2012-02-15 22:51:49 +08:00
|
|
|
case TRACE_REG_PERF_OPEN:
|
|
|
|
case TRACE_REG_PERF_CLOSE:
|
2012-02-15 22:51:50 +08:00
|
|
|
case TRACE_REG_PERF_ADD:
|
|
|
|
case TRACE_REG_PERF_DEL:
|
2012-02-15 22:51:49 +08:00
|
|
|
return 0;
|
2010-04-22 00:27:06 +08:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-05-05 23:45:27 +08:00
|
|
|
static int syscall_exit_register(struct trace_event_call *event,
|
2012-02-15 22:51:49 +08:00
|
|
|
enum trace_reg type, void *data)
|
2010-04-22 00:27:06 +08:00
|
|
|
{
|
2015-05-05 22:09:53 +08:00
|
|
|
struct trace_event_file *file = data;
|
2012-08-09 02:48:20 +08:00
|
|
|
|
2010-04-22 00:27:06 +08:00
|
|
|
switch (type) {
|
|
|
|
case TRACE_REG_REGISTER:
|
2012-08-09 02:48:20 +08:00
|
|
|
return reg_event_syscall_exit(file, event);
|
2010-04-22 00:27:06 +08:00
|
|
|
case TRACE_REG_UNREGISTER:
|
2012-08-09 02:48:20 +08:00
|
|
|
unreg_event_syscall_exit(file, event);
|
2010-04-22 00:27:06 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
case TRACE_REG_PERF_REGISTER:
|
|
|
|
return perf_sysexit_enable(event);
|
|
|
|
case TRACE_REG_PERF_UNREGISTER:
|
|
|
|
perf_sysexit_disable(event);
|
|
|
|
return 0;
|
2012-02-15 22:51:49 +08:00
|
|
|
case TRACE_REG_PERF_OPEN:
|
|
|
|
case TRACE_REG_PERF_CLOSE:
|
2012-02-15 22:51:50 +08:00
|
|
|
case TRACE_REG_PERF_ADD:
|
|
|
|
case TRACE_REG_PERF_DEL:
|
2012-02-15 22:51:49 +08:00
|
|
|
return 0;
|
2010-04-22 00:27:06 +08:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|