diff options
| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-04-08 11:29:36 -0400 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2011-04-25 11:36:12 -0400 |
| commit | e0ac8457d020c0289ea566917267da9e5e6d9865 (patch) | |
| tree | 85c7ad75fc186feceffac2de16b5a195d0cae8af /arch/sh/kernel/signal_32.c | |
| parent | bf0b8f4b55e591ba417c2dbaff42769e1fc773b0 (diff) | |
sh, hw_breakpoints: Fix racy access to ptrace breakpoints
While the tracer accesses ptrace breakpoints, the child task may
concurrently exit due to a SIGKILL and thus release its breakpoints
at the same time. We can then dereference some freed pointers.
To fix this, hold a reference on the child breakpoints before
manipulating them.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1302284067-7860-6-git-send-email-fweisbec@gmail.com
Diffstat (limited to 'arch/sh/kernel/signal_32.c')
0 files changed, 0 insertions, 0 deletions