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Date: Mon, 27 Feb 2012 18:22:08 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Will Drewry <wad@...omium.org>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
peterz@...radead.org, rdunlap@...otime.net, mcgrathr@...omium.org,
tglx@...utronix.de, luto@....edu, eparis@...hat.com,
serge.hallyn@...onical.com, djm@...drot.org, scarybeasts@...il.com,
indan@....nu, pmoore@...hat.com, akpm@...ux-foundation.org,
corbet@....net, eric.dumazet@...il.com, markus@...omium.org,
coreyb@...ux.vnet.ibm.com, keescook@...omium.org
Subject: Re: [PATCH v11 08/12] signal, x86: add SIGSYS info and make it
synchronous.
On 02/24, Will Drewry wrote:
>
> To ensure that SIGSYS delivery occurs on return from the triggering
> system call, SIGSYS is added to the SYNCHRONOUS_MASK macro.
Hmm. Can't understand... please help.
> #define SYNCHRONOUS_MASK \
> (sigmask(SIGSEGV) | sigmask(SIGBUS) | sigmask(SIGILL) | \
> - sigmask(SIGTRAP) | sigmask(SIGFPE))
> + sigmask(SIGTRAP) | sigmask(SIGFPE) | sigmask(SIGSYS))
Why?
SYNCHRONOUS_MASK just tells dequeue_signal() "pick them first".
This is needed to make sure that the handler for, say SIGSEGV,
can use ucontext->ip as a faulting addr.
But seccomp adds info->si_call_addr, this looks unneeded.
Oleg.
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