From: Masami Hiramatsu <mhiramat@redhat.com>
Date: Wed, 12 Nov 2008 21:26:51 +0000 (-0800)
Subject: kprobes: disable preempt for module_text_address() and kernel_text_address()
X-Git-Tag: v2.6.28-rc5~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a189d0350f387786b1fb5a5d19e3a5ab0bc0cceb;p=pandora-kernel.git

kprobes: disable preempt for module_text_address() and kernel_text_address()

__register_kprobe() can be preempted after checking probing address but
before module_text_address() or try_module_get(), and in this interval
the module can be unloaded.  In that case, try_module_get(probed_mod)
will access to invalid address, or kprobe will probe invalid address.

This patch uses preempt_disable() to protect it and uses
__module_text_address() and __kernel_text_address().

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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