diff options
| author | Will Deacon <will.deacon@arm.com> | 2012-08-16 18:14:14 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-08-17 15:19:46 -0400 |
| commit | 60916a9382e88fbf5e54fd36a3e658efd7ab7bed (patch) | |
| tree | 803e8decdd28831fa4a60d5c75c5bb5a77a460db /kernel | |
| parent | 26a4f3c08de49c1437a7b7f97693cf22d8c31656 (diff) | |
| download | lwn-60916a9382e88fbf5e54fd36a3e658efd7ab7bed.tar.gz lwn-60916a9382e88fbf5e54fd36a3e658efd7ab7bed.zip | |
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
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 60e4d7875672..6b245f64c8dd 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -506,6 +506,8 @@ 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; @@ -580,6 +582,8 @@ 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; |