From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 16 Jun 2009 22:27:10 +0000 (+0200)
Subject: send_sigio_to_task: sanitize the usage of fown->signum
X-Git-Tag: v2.6.31-rc1~300
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8eeee4e2f04fc551f50c9d9847da2d73d7d33728;p=pandora-kernel.git

send_sigio_to_task: sanitize the usage of fown->signum

send_sigio_to_task() reads fown->signum several times, we can race with
F_SETSIG which changes ->signum lockless.  In theory, this can fool
security checks or we can call group_send_sig_info() with the wrong
->si_signo which does not match "int sig".

Change the code to cache ->signum.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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