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| author | Will Deacon <will.deacon@arm.com> | 2012-08-16 18:14:14 +0100 |
|---|---|---|
| committer | Simon Shields <keepcalm444@gmail.com> | 2016-03-15 17:41:30 +1100 |
| commit | c2710a162474f0fba1018167499c3c5b4a5e4ce7 (patch) | |
| tree | 8beef2c817e85d5fef2a391674dbbe23c0b2d0cc /kernel | |
| parent | 07c64da538554085466e9338e19f033438a0a5bf (diff) | |
| download | kernel_samsung_smdk4412-c2710a162474f0fba1018167499c3c5b4a5e4ce7.tar.gz kernel_samsung_smdk4412-c2710a162474f0fba1018167499c3c5b4a5e4ce7.tar.bz2 kernel_samsung_smdk4412-c2710a162474f0fba1018167499c3c5b4a5e4ce7.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
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 5819cd5cf7c..d6803a49d65 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; |