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Message-Id: <201306282209.21839.vda.linux@googlemail.com>
Date: Fri, 28 Jun 2013 22:09:21 +0200
From: Denys Vlasenko <vda.linux@...glemail.com>
To: Ralf Baechle <ralf@...ux-mips.org>
Cc: Oleg Nesterov <oleg@...hat.com>,
James Hogan <james.hogan@...tec.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Daney <ddaney@...iumnetworks.com>,
David Daney <ddaney.cavm@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Al Viro <viro@...iv.linux.org.uk>,
Kees Cook <keescook@...omium.org>,
David Daney <david.daney@...ium.com>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
David Howells <dhowells@...hat.com>,
Dave Jones <davej@...hat.com>, linux-mips@...ux-mips.org,
stable@...r.kernel.org
Subject: Re: [PATCH v3] kernel/signal.c: fix BUG_ON with SIG128 (MIPS)
On Wednesday 26 June 2013 18:59, Ralf Baechle wrote:
> On Wed, Jun 26, 2013 at 06:14:52PM +0200, Oleg Nesterov wrote:
>
> > Or simply remove the BUG_ON(), this can equally confuse wait(status).
> > 128 & 0x7f == 0.
> >
> > Still I think it would be better to change _NSIG on mips.
>
> If it was that easy. That's going to outright break binary compatibility,
> see kernel/signal.c:
>
> SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
> sigset_t __user *, oset, size_t, sigsetsize)
> {
> sigset_t old_set, new_set;
> int error;
>
> /* XXX: Don't preclude handling different sized sigset_t's. */
> if (sigsetsize != sizeof(sigset_t))
> return -EINVAL;
>
> There are several more more syscalls performing tests like the above.
Reducing _NSIG to 127 (or 126) doesn't change sigset_t, so should be fine wrt above.
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