From: Paul Mackerras <paulus@samba.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-arch@kernel.org, linux-kernel@vger.kernel.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: powerpc: fix double syscall restarts
Date: Wed, 22 Sep 2010 15:44:10 +1000 [thread overview]
Message-ID: <20100922054410.GA22365@drongo> (raw)
In-Reply-To: <20100920204856.GF31363@ZenIV.linux.org.uk>
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@zeniv.linux.org.uk>
Acked-by: Paul Mackerras <paulus@samba.org>
prev parent reply other threads:[~2010-09-22 5:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-20 20:48 powerpc: fix double syscall restarts Al Viro
2010-09-22 5:44 ` Paul Mackerras [this message]
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