linux-kernel - [PATCH -tip][URGENT] kprobes: Calculate the index correctly when freeing the out-of-line execution slot.

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Message-ID: <4B9667AB.9050507@redhat.com>
Date:	Tue, 09 Mar 2010 10:22:19 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Sachin Sant <sachinp@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [PATCH -tip][URGENT] kprobes: Calculate the index correctly when
 freeing the out-of-line execution slot.

>From : Ananth N Mavinakayanahalli <ananth@...ibm.com>

When freeing the instruction slot, the arithmetic to calculate the index
of the slot in the page needs to account for the total size of the
instruction on the various architectures.

Calculate the index correctly when freeing the out-of-line execution slot.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Reported-by: Sachin Sant <sachinp@...ibm.com>
Reported-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
Index: linux-8mar/kernel/kprobes.c
===================================================================
--- linux-8mar.orig/kernel/kprobes.c	2010-03-08 17:10:33.000000000 +0530
+++ linux-8mar/kernel/kprobes.c	2010-03-08 17:12:12.000000000 +0530
@@ -259,7 +259,8 @@
 	struct kprobe_insn_page *kip;
 
 	list_for_each_entry(kip, &c->pages, list) {
-		long idx = ((long)slot - (long)kip->insns) / c->insn_size;
+		long idx = ((long)slot - (long)kip->insns) /
+				(c->insn_size * sizeof(kprobe_opcode_t));
 		if (idx >= 0 && idx < slots_per_page(c)) {
 			WARN_ON(kip->slot_used[idx] != SLOT_USED);
 			if (dirty) {
-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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