From: Alexey Dobriyan <adobriyan@sw.ru>
Date: Tue, 8 May 2007 07:28:43 +0000 (-0700)
Subject: Fix race between cat /proc/*/wchan and rmmod et al
X-Git-Tag: v2.6.22-rc1~686
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d65cb4a1718a072898c7a57a3bc61b2dc4bcd4d;p=pandora-kernel.git

Fix race between cat /proc/*/wchan and rmmod et al

kallsyms_lookup() can go iterating over modules list unprotected which is OK
for emergency situations (oops), but not OK for regular stuff like
/proc/*/wchan.

Introduce lookup_symbol_name()/lookup_module_symbol_name() which copy symbol
name into caller-supplied buffer or return -ERANGE.  All copying is done with
module_mutex held, so...

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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