From: Zhang, Yanmin <yanmin.zhang@intel.com>
Date: Fri, 30 Sep 2005 18:59:20 +0000 (-0700)
Subject: [PATCH] utilization of kprobe_mutex is incorrect on x86_64
X-Git-Tag: v2.6.14-rc3~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2dd960d66bc12b6b206e63104636514e5da0ddb7;p=pandora-kernel.git

[PATCH] utilization of kprobe_mutex is incorrect on x86_64

The up()/down() orders are incorrect in arch/x86_64/kprobes.c file.
kprobe_mutext is used to protect the free kprobe instruction slot list.
arch_prepare_kprobe applies for a slot from the free list, and
arch_remove_kprobe returns a slot to the free list.  The incorrect up()/down()
orders to operate on kprobe_mutex fail to protect the free list.  If 2 threads
try to get/return kprobe instruction slot at the same time, the free slot list
might be broken, or a free slot might be applied by 2 threads.

Signed-off-by: Zhang Yanmin <Yanmin.zhang@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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