linux-kernel - [PATCH -mm] bugfix: pass aggr_kprobe to arch_remove

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Message-ID: <4922ED4D.8070201@redhat.com>
Date:	Tue, 18 Nov 2008 11:29:01 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	akpm@...ux-foundation.org
CC:	mm-commits@...r.kernel.org, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, Jim Keniston <jkenisto@...ibm.com>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH -mm] bugfix: pass aggr_kprobe to arch_remove_kprobe

Hi Andrew,

akpm@...ux-foundation.org wrote:
> The patch titled
>      kprobes: support probing module __exit function
> has been added to the -mm tree.  Its filename is
>      kprobes-support-probing-module-__exit-function.patch

I found that one bug was still alive. Here is the bugfix.

Thank you,

Call arch_remove_kprobe() with aggr_kprobe instead of user specific kprobe,
because the user specific kprobe on the gone or reused aggr_kprobe may have
invalid arch_specific_insn.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
---
 kernel/kprobes.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Index: 2.6-rc/kernel/kprobes.c
===================================================================
--- 2.6-rc.orig/kernel/kprobes.c
+++ 2.6-rc/kernel/kprobes.c
@@ -766,14 +766,14 @@ static void __kprobes __unregister_kprob
 {
 	struct kprobe *old_p;

-	if (list_empty(&p->list) || list_is_singular(&p->list)) {
-		if (!list_empty(&p->list)) {
-			/* "p" is the last child of an aggr_kprobe */
-			old_p = list_entry(p->list.next, struct kprobe, list);
-			list_del(&p->list);
-			kfree(old_p);
-		}
+	if (list_empty(&p->list))
 		arch_remove_kprobe(p);
+	else if (list_is_singular(&p->list)) {
+		/* "p" is the last child of an aggr_kprobe */
+		old_p = list_entry(p->list.next, struct kprobe, list);
+		list_del(&p->list);
+		arch_remove_kprobe(old_p);
+		kfree(old_p);
 	}
 }


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com


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