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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-04-08 17:29:36 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-05-21 15:13:04 -0700 |
| commit | ecff5f1a67ee54409b65a7621ba0c5709f2b79b7 (patch) | |
| tree | 8903a2f217cf1a1004c6bc1ecbcb8351362ad58a /kernel | |
| parent | fe516b2b16d0b13d6c07c63e7aac5c71b438da8f (diff) | |
x86, hw_breakpoints: Fix racy access to ptrace breakpoints
commit 87dc669ba25777b67796d7262c569429e58b1ed4 upstream.
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>
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>
Cc: Paul Mundt <lethal@linux-sh.org>
Link: http://lkml.kernel.org/r/1302284067-7860-3-git-send-email-fweisbec@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions