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kprobes: makes kprobes/enabled works correctly for optimized kprobes. 

debugfs/kprobes/enabled doesn't work correctly on optimized kprobes.
Masami Hiramatsu has a test report on x86_64 platform:

https://lkml.org/lkml/2015/1/19/274

This patch forces it to unoptimize kprobe if kprobes_all_disarmed is set.
It also checks the flag in unregistering path for skipping unneeded
disarming process when kprobes globally disarmed.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wang Nan 2015-02-13 14:40:26 -08:00 committed by Linus Torvalds
parent 977ad481b6
commit 69d54b916d
1 changed files with 9 additions and 2 deletions
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11
kernel/kprobes.c
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@ -869,7 +869,8 @@ static void __disarm_kprobe(struct kprobe *p, bool reopt)
{
struct kprobe *_p;
unoptimize_kprobe(p, false); /* Try to unoptimize */
/* Try to unoptimize */
unoptimize_kprobe(p, kprobes_all_disarmed);
if (!kprobe_queued(p)) {
arch_disarm_kprobe(p);
@ -1571,7 +1572,13 @@ static struct kprobe *__disable_kprobe(struct kprobe *p)
/* Try to disarm and disable this/parent probe */
if (p == orig_p || aggr_kprobe_disabled(orig_p)) {
disarm_kprobe(orig_p, true);
/*
* If kprobes_all_disarmed is set, orig_p
* should have already been disarmed, so
* skip unneed disarming process.
*/
if (!kprobes_all_disarmed)
disarm_kprobe(orig_p, true);
orig_p->flags |= KPROBE_FLAG_DISABLED;
}
}