linux-kernel - Re: powerpc: fix double syscall restarts

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Message-ID: <20100922054410.GA22365@drongo>
Date:	Wed, 22 Sep 2010 15:44:10 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-arch@...nel.org, linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: powerpc: fix double syscall restarts

On Mon, Sep 20, 2010 at 09:48:57PM +0100, Al Viro wrote:

> Make sigreturn zero regs->trap, make do_signal() do the same on all
> paths.  As it is, signal interrupting e.g. read() from fd 512 (==
> ERESTARTSYS) with another signal getting unblocked when the first
> handler finishes will lead to restart one insn earlier than it ought
> to.  Same for multiple signals with in-kernel handlers interrupting
> that sucker at the same time.  Same for multiple signals of any kind
> interrupting that sucker on 64bit...
> 
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>

Acked-by: Paul Mackerras <paulus@...ba.org>
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