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kprobes, ftrace: Allow probing on some functions 

There is no need to prohibit probing on the functions
used for preparation and uprobe only fetch functions.
Those are safely probed because those are not invoked
from kprobe's breakpoint/fault/debug handlers. So there
is no chance to cause recursive exceptions.

Following functions are now removed from the kprobes blacklist:

	update_bitfield_fetch_param
	free_bitfield_fetch_param
	kprobe_register
	FETCH_FUNC_NAME(stack, type) in trace_uprobe.c
	FETCH_FUNC_NAME(memory, type) in trace_uprobe.c
	FETCH_FUNC_NAME(memory, string) in trace_uprobe.c
	FETCH_FUNC_NAME(memory, string_size) in trace_uprobe.c
	FETCH_FUNC_NAME(file_offset, type) in trace_uprobe.c

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20140417081800.26341.56504.stgit@ltc230.yrl.intra.hitachi.co.jp
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masami Hiramatsu 2014-04-17 17:18:00 +09:00 committed by Ingo Molnar
parent 55479f6475
commit fbc1963d2c
3 changed files with 14 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
kernel/trace/trace_kprobe.c
View File

@ -1196,9 +1196,8 @@ kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
* kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe
* lockless, but we can't race with this __init function.
*/
static __kprobes
int kprobe_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
static int kprobe_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
{
struct trace_kprobe *tk = (struct trace_kprobe *)event->data;
struct ftrace_event_file *file = data;

4
kernel/trace/trace_probe.c
View File

@ -183,7 +183,7 @@ DEFINE_BASIC_FETCH_FUNCS(bitfield)
#define fetch_bitfield_string NULL
#define fetch_bitfield_string_size NULL
static __kprobes void
static void
update_bitfield_fetch_param(struct bitfield_fetch_param *data)
{
/*
@ -196,7 +196,7 @@ update_bitfield_fetch_param(struct bitfield_fetch_param *data)
update_symbol_cache(data->orig.data);
}
static __kprobes void
static void
free_bitfield_fetch_param(struct bitfield_fetch_param *data)
{
/*

20
kernel/trace/trace_uprobe.c
View File

@ -108,8 +108,8 @@ static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
* Uprobes-specific fetch functions
*/
#define DEFINE_FETCH_stack(type) \
static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
void *offset, void *dest) \
static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs, \
void *offset, void *dest) \
{ \
*(type *)dest = (type)get_user_stack_nth(regs, \
((unsigned long)offset)); \
@ -120,8 +120,8 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
#define fetch_stack_string_size NULL
#define DEFINE_FETCH_memory(type) \
static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
void *addr, void *dest) \
static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs, \
void *addr, void *dest) \
{ \
type retval; \
void __user *vaddr = (void __force __user *) addr; \
@ -136,8 +136,8 @@ DEFINE_BASIC_FETCH_FUNCS(memory)
* Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
* length and relative data location.
*/
static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
void *addr, void *dest)
static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
void *addr, void *dest)
{
long ret;
u32 rloc = *(u32 *)dest;
@ -158,8 +158,8 @@ static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
}
}
static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
void *addr, void *dest)
static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
void *addr, void *dest)
{
int len;
void __user *vaddr = (void __force __user *) addr;
@ -184,8 +184,8 @@ static unsigned long translate_user_vaddr(void *file_offset)
}
#define DEFINE_FETCH_file_offset(type) \
static __kprobes void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs,\
void *offset, void *dest) \
static void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs, \
void *offset, void *dest)\
{ \
void *vaddr = (void *)translate_user_vaddr(offset); \
\