People keep hitting on spurious failures in malloc/free routines when using sanitizers
with shared libraries dlopened with RTLD_DEEPBIND (see https://github.com/google/sanitizers/issues/611 for details).
Let's check for this flag and bail out with warning message instead of failing in random places.
Differential Revision: https://reviews.llvm.org/D30504
llvm-svn: 297370
There are two possible return values for strerror_r:
On OS X, the return value is always `int`.
On Linux, the return value can be either `char *` or `int`, depending
on the value of:
`(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE`
Because OS X interceptors require a matching function signature,
split out the two cases into separate interceptors, using the above
information to determine the correct signature for a given build.
llvm-svn: 297315
Summary:
Symbol __tls_get_addr_internal is a GLIBC_PRIVATE private symbol on s390{,x}, the glibc folks aren't very happy about asan using it.
Additionally, only recent glibc versions have it, older versions just have __tls_get_offset and nothing else.
The patch doesn't drop the __tls_get_addr_internal interception altogether, but changes it so that it calls real __tls_get_offset function instead (and much more importantly,
that __tls_get_offset interception calls the real __tls_get_offset function).
This way it should work also on glibc 2.18 and earlier. See http://gcc.gnu.org/PR79341 for further details.
Reviewers: kcc, koriakin
Reviewed By: kcc, koriakin
Subscribers: kubamracek, mehdi_amini
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D29735
llvm-svn: 294790
Summary: We setup these interceptors twice which hangs test on windows.
Reviewers: eugenis
Subscribers: llvm-commits, kubabrecka
Differential Revision: https://reviews.llvm.org/D28070
llvm-svn: 290393
See D19555 for rationale. As it turns out, this treatment is also necessary
for scanf/printf.
Differential Revision: https://reviews.llvm.org/D27118
llvm-svn: 288064
Summary:
In non-strict mode we will check memory access for both strings from beginning
to either:
1. 0-char
2. size
3. different chars
In strict mode we will check from beginning to either:
1. 0-char
2. size
Previously in strict mode we always checked up to the 0-char.
Reviewers: kcc, eugenis
Subscribers: llvm-commits, kubabrecka
Differential Revision: https://reviews.llvm.org/D26574
llvm-svn: 286708
Summary:
This patch is re-introducing the code to fix the
dynamic hooking on windows and to fix a compiler
warning on Apple.
Related patches:
* https://reviews.llvm.org/D22641
* https://reviews.llvm.org/D22610
* https://reviews.llvm.org/rL276311
* https://reviews.llvm.org/rL276490
Both architecture are using different techniques to
hook on library functions (memchr, strcpy,...).
On Apple, the function is not dynamically hooked and
the symbol always points to a valid function
(i.e. can't be null). The REAL macro returns the
symbol.
On windows, the function is dynamically patch and the
REAL(...) function may or may not be null. It depend
on whether or not the function was hooked correctly.
Also, on windows memcpy and memmove are the same.
```
#if !defined(__APPLE__)
[...]
# define REAL(x) __interception::PTR_TO_REAL(x)
# define ASSIGN_REAL(dst, src) REAL(dst) = REAL(src)
[...]
#else // __APPLE__
[...]
# define REAL(x) x
# define ASSIGN_REAL(x, y)
[...]
#endif // __APPLE__
Reviewers: rnk
Subscribers: kcc, hans, kubabrecka, llvm-commits, bruno, chrisha
Differential Revision: https://reviews.llvm.org/D22758
llvm-svn: 276885
sanitizer_common_interceptors.inc:667:12: warning: address of function 'memchr' will always evaluate to 'true' [-Wpointer-bool-conversion]
if (REAL(memchr)) {
~~ ^~~~~~
llvm-svn: 276539
Summary:
This patch is fixing running interception unittests for memcpy/memmove on
windows 64.
Reviewers: rnk
Subscribers: llvm-commits, wang0109, kubabrecka, chrisha
Differential Revision: https://reviews.llvm.org/D22641
llvm-svn: 276324
On PowerPC, if binutils and glibc are new enough, the linker uses
an optimized code sequence to implement __tls_get_addr call stub,
which will end up calling __tls_get_addr_opt instead of __tls_get_addr.
Thus, we need to intercept it in addition to __tls_get_addr.
This symbol is actually an alias of __tls_get_addr - its only purpose
is that its presence in glibc triggers the optimization in linker.
This means we can make our own intercepting symbol an alias as well.
This patch will make the linker attempt optimization even on older
glibc's (since it sees a defined __tls_get_addr_opt symbol in msan)
- however, this is only a very minor performance problem (the linker
generated code will never recognize a filled static TLS descriptor,
always burning a few cycles), not a correctness problem.
This fixes MSan's dtls_test.c, allowing us to finally enable MSan
on PowerPC64.
llvm-svn: 273250
Dstaddr may contain uninitialized padding at the end (common
implementations accept larger addrlen and ignore the extra bytes).
Also, depending on the socket state, dstaddr argument may be ignored.
llvm-svn: 273205
s390 is special again - instead of __tls_get_addr, it has __tls_get_offset
with special calling conventions: the result is TP relative, and
the argument is GOT-relative. Since we need to get address of the caller's
GOT, which is in %r12, we have to use assembly like glibc does.
Aside of __tls_get_offset, glibc also implements a slightly saner
__tls_get_addr_internal, which takes a pointer as argument, but still
returns a TP-relative offset. It is used for dlsym() called on TLS
symbols, so we have to intercept it was well. Our __tls_get_offset
is also implemented by delegating to it.
Differential Revision: http://reviews.llvm.org/D19778
llvm-svn: 273041
Summary:
Adds *fstat to the common interceptors.
Removes the now-duplicate fstat interceptor from msan/tsan
This adds fstat to asan/esan, which previously did not intercept it.
Resubmit of http://reviews.llvm.org/D20318 with ios build fixes.
Reviewers: eugenis, vitalybuka, aizatsky
Subscribers: zaks.anna, kcc, bruening, kubabrecka, srhines, danalbert, tberghammer
Differential Revision: http://reviews.llvm.org/D20350
llvm-svn: 269981
Summary:
Adds *fstat to the common interceptors.
Removes the now-duplicate fstat interceptor from msan/tsan
This adds fstat to asan/esan, which previously did not intercept it.
Reviewers: eugenis, vitalybuka, aizatsky
Subscribers: tberghammer, danalbert, srhines, kubabrecka, bruening, kcc
Differential Revision: http://reviews.llvm.org/D20318
llvm-svn: 269856
Fix https://llvm.org/bugs/show_bug.cgi?id=27673.
Currenty ASan checks the return value of real recv/recvfrom to see if the written bytes fit in the buffer. That works fine most of time.
However, there is an exception: (from the RECV(2) man page)
MSG_TRUNC (since Linux 2.2)
... return the real length of the packet or datagram, even when it was longer than the passed buffer. ...
Some programs combine MSG_TRUNC, MSG_PEEK and a single-byte buffer to peek the incoming data size without reading (much of) them. In this case,
the return value is usually longer than what's been written and ASan raises a false alarm here. To avoid such false positive reports,
we can use min(res, len) in COMMON_INTERCEPTOR_WRITE_RANGE checks.
Differential Revision: http://reviews.llvm.org/D20280
llvm-svn: 269749
Adds *stat to the common interceptors.
Removes the now-duplicate *stat interceptor from msan/tsan/esan.
This adds *stat to asan, which previously did not intercept it.
Patch by Qin Zhao.
llvm-svn: 269223
Summary:
Adds stat/__xstat to the common interceptors.
Removes the now-duplicate stat/__xstat interceptor from msan/tsan/esan.
This adds stat/__xstat to asan, which previously did not intercept it.
Resubmit of http://reviews.llvm.org/D19875 with win build fixes.
Reviewers: aizatsky, eugenis
Subscribers: tberghammer, llvm-commits, danalbert, vitalybuka, bruening, srhines, kubabrecka, kcc
Differential Revision: http://reviews.llvm.org/D19890
llvm-svn: 268466
Summary:
Adds stat/__xstat to the common interceptors.
Removes the now-duplicate stat/__xstat interceptor from msan/tsan/esan.
This adds stat/__xstat to asan, which previously did not intercept it.
Reviewers: aizatsky, eugenis
Subscribers: tberghammer, danalbert, srhines, kubabrecka, llvm-commits, vitalybuka, eugenis, kcc, bruening
Differential Revision: http://reviews.llvm.org/D19875
llvm-svn: 268440
On linux, some architectures had an ABI transition from 64-bit long double
(ie. same as double) to 128-bit long double. On those, glibc symbols
involving long doubles come in two versions, and we need to pass the
correct one to dlvsym when intercepting them.
A few more functions we intercept are also versioned (all printf, scanf,
strtold variants), but there's no need to fix these, as the REAL() versions
are never called.
Differential Revision: http://reviews.llvm.org/D19555
llvm-svn: 267794
Summary:
The strchr and strrchr interceptors are sometimes invoked too early
for their REAL() counterparts to be initialized. We have seen this in
hooks invoked from tcmalloc on the dlsym() used in initializing
interceptors. A special check is added to use internal_ routines for
this situation.
Reviewers: vitalybuka, aizatsky, filcab
Subscribers: filcab, llvm-commits, eugenis, kcc, zhaoqin, aizatsky, kubabrecka
Differential Revision: http://reviews.llvm.org/D19607
llvm-svn: 267793
Summary:
The strlen interceptor is sometimes invoked too early for REAL(strlen) to
be initialized. A special check is added to use internal_strlen for this
situation.
Reviewers: dim
Subscribers: llvm-commits, samsonov
Differential Revision: http://reviews.llvm.org/D18851
Change-Id: I3acc58f4abbae1904f25324abd84efea67aad0a2
llvm-svn: 265705
Summary:
Currently, sanitizer_common_interceptors.inc has an implicit, undocumented
assumption that the sanitizer including it has previously declared
interceptors for memset and memmove. Since the memset, memmove, and memcpy
routines require interception by many sanitizers, we add them to the
set of common interceptions, both to address the undocumented assumption
and to speed future tool development. They are intercepted under a new
flag intercept_intrin.
The tsan interceptors are removed in favor of the new common versions. The
asan and msan interceptors for these are more complex (they incur extra
interception steps and their function bodies are exposed to the compiler)
so they opt out of the common versions and keep their own.
Reviewers: vitalybuka
Subscribers: zhaoqin, llvm-commits, kcc
Differential Revision: http://reviews.llvm.org/D18465
llvm-svn: 264451
Summary:
Adds strnlen to the common interceptors, under the existing flag
intercept_strlen.
Removes the now-duplicate strnlen interceptor from asan and msan.
This adds strnlen to tsan, which previously did not intercept it.
Adds a new test of strnlen to the sanitizer_common test cases.
Reviewers: samsonov
Subscribers: zhaoqin, llvm-commits, kcc
Differential Revision: http://reviews.llvm.org/D18397
llvm-svn: 264195
Adds strchr, strchrnul, and strrchr to the common interceptors, under a new
common flag intercept_strchr.
Removes the now-duplicate strchr interceptor from asan and all 3
interceptors from tsan. Previously, asan did not intercept strchrnul, but
does now; previously, msan did not intercept strchr, strchrnul, or strrchr,
but does now.
http://reviews.llvm.org/D18329
Patch by Derek Bruening!
llvm-svn: 263992
This patch adds a new TSan report type, ReportTypeMutexInvalidAccess, which is triggered when pthread_mutex_lock or pthread_mutex_unlock returns EINVAL (this means the mutex is invalid, uninitialized or already destroyed).
Differential Revision: http://reviews.llvm.org/D18132
llvm-svn: 263641
Summary:
Adds strlen to the common interceptors, under a new common flag
intercept_strlen. This provides better sharing of interception code among
sanitizers and cleans up the inconsistent type declarations of the
previously duplicated interceptors.
Removes the now-duplicate strlen interceptor from asan, msan, and tsan.
The entry check semantics are normalized now for msan and asan, whose
private strlen interceptors contained multiple layers of checks that
included impossible-to-reach code. The new semantics are identical to the
old: bypass interception if in the middle of init or if both on Mac and not
initialized; else, call the init routine and proceed.
Patch by Derek Bruening!
Reviewers: samsonov, vitalybuka
Subscribers: llvm-commits, kcc, zhaoqin
Differential Revision: http://reviews.llvm.org/D18020
llvm-svn: 263177
Pass res instead of len as third parameter to COMMON_INTERCEPTOR_WRITE_RANGE,
because otherwise we can write to unrelated memory (in MSan) or get wrong report (in ASan).
Differential Revision: http://reviews.llvm.org/D17608
llvm-svn: 261898
Evgeniy Stepanov