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author | Will Deacon <will.deacon@arm.com> | 2012-08-16 18:14:14 +0100 |
---|---|---|
committer | Ziyan <jaraidaniel@gmail.com> | 2016-01-05 18:20:41 +0100 |
commit | b61725bccc1fdd62ab85d0672123ab8dd9e6df84 (patch) | |
tree | 66ea8de24ddcfbb144af0b3fdc36fec8bd89eec5 /kernel | |
parent | d441a294e5edc35a5e85cef6ab716dfea9ccb24e (diff) | |
download | kernel_samsung_tuna-b61725bccc1fdd62ab85d0672123ab8dd9e6df84.zip kernel_samsung_tuna-b61725bccc1fdd62ab85d0672123ab8dd9e6df84.tar.gz kernel_samsung_tuna-b61725bccc1fdd62ab85d0672123ab8dd9e6df84.tar.bz2 |
tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
syscall_get_nr can return -1 in the case that the task is not executing
a system call.
This patch fixes perf_syscall_{enter,exit} to check that the syscall
number is valid before using it as an index into a bitmap.
Link: http://lkml.kernel.org/r/1345137254-7377-1-git-send-email-will.deacon@arm.com
Change-Id: Iedc719957e184c6572b3ad94e241ae2a97a0b533
Cc: Jason Baron <jbaron@redhat.com>
Cc: Wade Farnsworth <wade_farnsworth@mentor.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/trace/trace_syscalls.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 5819cd5..d6803a4 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -518,6 +518,8 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id) int size; syscall_nr = syscall_get_nr(current, regs); + if (syscall_nr < 0) + return; if (!test_bit(syscall_nr, enabled_perf_enter_syscalls)) return; @@ -592,6 +594,8 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret) int size; syscall_nr = syscall_get_nr(current, regs); + if (syscall_nr < 0) + return; if (!test_bit(syscall_nr, enabled_perf_exit_syscalls)) return; |