From: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Date: Thu, 26 Mar 2009 17:03:08 +0000 (-0700)
Subject: x86: signal: check sas_ss_size instead of sas_ss_flags()
X-Git-Tag: v2.6.30-rc1~211^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f8f308925ebe0480bd9831d32963ee0b885e24b;p=pandora-kernel.git

x86: signal: check sas_ss_size instead of sas_ss_flags()

Impact: fix redundant and incorrect check

Oleg Nesterov noticed wrt commit:

  14fc9fb: x86: signal: check signal stack overflow properly

>> No need to check SA_ONSTACK if we're already using alternate signal stack.
>
> Yes, but this also mean that we don't need sas_ss_flags() under
> "if (!onsigstack)",

Checking on_sig_stack() in sas_ss_flags() at get_sigframe() is redundant
and not correct on 64 bit. To check sas_ss_size is enough.

Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: roland@redhat.com
LKML-Reference: <49CBB54C.5080201@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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