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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2013-04-18 18:33:18 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-18 08:58:38 -0700
commit5c51543b0ae45967cfa99ca16748dc72888cc265 (patch)
tree3bcc3c5f26adf4c773e934f110b596914b4fb856 /block
parentd202f05158442396033f416df376f8ece1f563df (diff)
downloadop-kernel-dev-5c51543b0ae45967cfa99ca16748dc72888cc265.zip
op-kernel-dev-5c51543b0ae45967cfa99ca16748dc72888cc265.tar.gz
kprobes: Fix a double lock bug of kprobe_mutex
Fix a double locking bug caused when debug.kprobe-optimization=0. While the proc_kprobes_optimization_handler locks kprobe_mutex, wait_for_kprobe_optimizer locks it again and that causes a double lock. To fix the bug, this introduces different mutex for protecting sysctl parameter and locks it in proc_kprobes_optimization_handler. Of course, since we need to lock kprobe_mutex when touching kprobes resources, that is done in *optimize_all_kprobes(). This bug was introduced by commit ad72b3bea744 ("kprobes: fix wait_for_kprobe_optimizer()") Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions
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