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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-04-08 17:29:36 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2011-04-25 17:35:18 +0200 |
| commit | bf0b8f4b55e591ba417c2dbaff42769e1fc773b0 (patch) | |
| tree | 4d70fa98ef40860ff596fccb05518c1806697a39 /arch/sh/kernel/ptrace_32.c | |
| parent | 07fa7a0a8a586c01a8b416358c7012dcb9dc688d (diff) | |
| download | lwn-bf0b8f4b55e591ba417c2dbaff42769e1fc773b0.tar.gz lwn-bf0b8f4b55e591ba417c2dbaff42769e1fc773b0.zip | |
arm, 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: Will Deacon <will.deacon@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Link: http://lkml.kernel.org/r/1302284067-7860-5-git-send-email-fweisbec@gmail.com
Diffstat (limited to 'arch/sh/kernel/ptrace_32.c')
0 files changed, 0 insertions, 0 deletions