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kprobes: makes kprobes/enabled works correctly for optimized kprobes.
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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 <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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WangNan0 authored and torvalds committed Feb 14, 2015
1 parent 977ad48 commit 69d54b9
Showing 1 changed file with 9 additions and 2 deletions.
11 changes: 9 additions & 2 deletions kernel/kprobes.c
Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand Down Expand Up @@ -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;
}
}
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