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| author | Masami Hiramatsu <mhiramat@redhat.com> | 2009-05-07 16:31:26 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-08 16:23:48 -0700 |
| commit | 201517a7f3ec497fff545a7659c6c876f89f9054 (patch) | |
| tree | 47721de5b13043eb9e7e10aaf7fe544c794a3c7d /kernel | |
| parent | d7a5926978cb109b2db5985c65086483caf9e226 (diff) | |
| download | lwn-201517a7f3ec497fff545a7659c6c876f89f9054.tar.gz lwn-201517a7f3ec497fff545a7659c6c876f89f9054.zip | |
kprobes: fix to use text_mutex around arm/disarm kprobe
Fix kprobes to lock text_mutex around some arch_arm/disarm_kprobe() which
are newly added by commit de5bd88d5a5cce3cacea904d3503e5ebdb3852a2.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kprobes.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index a5e74ddee0e2..c0fa54b276d9 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -319,6 +319,22 @@ struct kprobe __kprobes *get_kprobe(void *addr) return NULL; } +/* Arm a kprobe with text_mutex */ +static void __kprobes arm_kprobe(struct kprobe *kp) +{ + mutex_lock(&text_mutex); + arch_arm_kprobe(kp); + mutex_unlock(&text_mutex); +} + +/* Disarm a kprobe with text_mutex */ +static void __kprobes disarm_kprobe(struct kprobe *kp) +{ + mutex_lock(&text_mutex); + arch_disarm_kprobe(kp); + mutex_unlock(&text_mutex); +} + /* * Aggregate handlers for multiple kprobes support - these handlers * take care of invoking the individual kprobe handlers on p->list @@ -538,7 +554,7 @@ static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p) ap->flags &= ~KPROBE_FLAG_DISABLED; if (!kprobes_all_disarmed) /* Arm the breakpoint again. */ - arch_arm_kprobe(ap); + arm_kprobe(ap); } return 0; } @@ -789,11 +805,8 @@ static int __kprobes __unregister_kprobe_top(struct kprobe *p) * enabled and not gone - otherwise, the breakpoint would * already have been removed. We save on flushing icache. */ - if (!kprobes_all_disarmed && !kprobe_disabled(old_p)) { - mutex_lock(&text_mutex); - arch_disarm_kprobe(p); - mutex_unlock(&text_mutex); - } + if (!kprobes_all_disarmed && !kprobe_disabled(old_p)) + disarm_kprobe(p); hlist_del_rcu(&old_p->hlist); } else { if (p->break_handler && !kprobe_gone(p)) @@ -810,7 +823,7 @@ noclean: if (!kprobe_disabled(old_p)) { try_to_disable_aggr_kprobe(old_p); if (!kprobes_all_disarmed && kprobe_disabled(old_p)) - arch_disarm_kprobe(old_p); + disarm_kprobe(old_p); } } return 0; @@ -1364,7 +1377,7 @@ int __kprobes disable_kprobe(struct kprobe *kp) try_to_disable_aggr_kprobe(p); if (!kprobes_all_disarmed && kprobe_disabled(p)) - arch_disarm_kprobe(p); + disarm_kprobe(p); out: mutex_unlock(&kprobe_mutex); return ret; @@ -1393,7 +1406,7 @@ int __kprobes enable_kprobe(struct kprobe *kp) } if (!kprobes_all_disarmed && kprobe_disabled(p)) - arch_arm_kprobe(p); + arm_kprobe(p); p->flags &= ~KPROBE_FLAG_DISABLED; if (p != kp) |