tracing/syscalls: fix perf syscall tracing when syscall_nr == -1
PATCH 1/1 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.
Cc Jason Baron <[email protected]>
Cc Wade Farnsworth <[email protected]>
Cc Steven Rostedt <[email protected]>
Cc Frederic Weisbecker <[email protected]>
Signed-off-by Will Deacon <[email protected]>
--- kernel/trace/trace_syscalls.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
kernel/trace/trace_syscalls.c +4 -0
@@ -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 ;
Signature · 1 line
1.7.4.1
[tip:perf/urgent] tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
Commit-ID: 60916a9382e88fbf5e54fd36a3e658efd7ab7bed Gitweb: http://git.kernel.org/tip/60916a9382e88fbf5e54fd36a3e658efd7ab7bed Author: Will Deacon <[email protected]> AuthorDate: Thu, 16 Aug 2012 18:14:14 +0100 Committer: Steven Rostedt <[email protected]> CommitDate: Fri, 17 Aug 2012 15:19:46 -0400
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.
Cc Jason Baron <[email protected]>
Cc Wade Farnsworth <[email protected]>
Cc Frederic Weisbecker <[email protected]>
Signed-off-by Will Deacon <[email protected]>
Signed-off-by Steven Rostedt <[email protected]>
--- kernel/trace/trace_syscalls.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
kernel/trace/trace_syscalls.c +4 -0
@@ -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 ;