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kprobes: fix to use text_mutex around arm/disarm kprobe

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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>
This commit is contained in:
Masami Hiramatsu 2009-05-07 16:31:26 -04:00 committed by Linus Torvalds
parent d7a5926978
commit 201517a7f3
1 changed files with 22 additions and 9 deletions
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31
kernel/kprobes.c
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@ -319,6 +319,22 @@ struct kprobe __kprobes *get_kprobe(void *addr)
return NULL; 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 * Aggregate handlers for multiple kprobes support - these handlers
* take care of invoking the individual kprobe handlers on p->list * 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; ap->flags &= ~KPROBE_FLAG_DISABLED;
if (!kprobes_all_disarmed) if (!kprobes_all_disarmed)
/* Arm the breakpoint again. */ /* Arm the breakpoint again. */
arch_arm_kprobe(ap); arm_kprobe(ap);
} }
return 0; return 0;
} }
@ -789,11 +805,8 @@ static int __kprobes __unregister_kprobe_top(struct kprobe *p)
* enabled and not gone - otherwise, the breakpoint would * enabled and not gone - otherwise, the breakpoint would
* already have been removed. We save on flushing icache. * already have been removed. We save on flushing icache.
*/ */
if (!kprobes_all_disarmed && !kprobe_disabled(old_p)) { if (!kprobes_all_disarmed && !kprobe_disabled(old_p))
mutex_lock(&text_mutex); disarm_kprobe(p);
arch_disarm_kprobe(p);
mutex_unlock(&text_mutex);
}
hlist_del_rcu(&old_p->hlist); hlist_del_rcu(&old_p->hlist);
} else { } else {
if (p->break_handler && !kprobe_gone(p)) if (p->break_handler && !kprobe_gone(p))
@ -810,7 +823,7 @@ noclean:
if (!kprobe_disabled(old_p)) { if (!kprobe_disabled(old_p)) {
try_to_disable_aggr_kprobe(old_p); try_to_disable_aggr_kprobe(old_p);
if (!kprobes_all_disarmed && kprobe_disabled(old_p)) if (!kprobes_all_disarmed && kprobe_disabled(old_p))
arch_disarm_kprobe(old_p); disarm_kprobe(old_p);
} }
} }
return 0; return 0;
@ -1364,7 +1377,7 @@ int __kprobes disable_kprobe(struct kprobe *kp)
try_to_disable_aggr_kprobe(p); try_to_disable_aggr_kprobe(p);
if (!kprobes_all_disarmed && kprobe_disabled(p)) if (!kprobes_all_disarmed && kprobe_disabled(p))
arch_disarm_kprobe(p); disarm_kprobe(p);
out: out:
mutex_unlock(&kprobe_mutex); mutex_unlock(&kprobe_mutex);
return ret; return ret;
@ -1393,7 +1406,7 @@ int __kprobes enable_kprobe(struct kprobe *kp)
} }
if (!kprobes_all_disarmed && kprobe_disabled(p)) if (!kprobes_all_disarmed && kprobe_disabled(p))
arch_arm_kprobe(p); arm_kprobe(p);
p->flags &= ~KPROBE_FLAG_DISABLED; p->flags &= ~KPROBE_FLAG_DISABLED;
if (p != kp) if (p != kp)