linux-kernel - Re: [PATCH v3] kernel/signal.c: fix BUG

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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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