Re: [PATCH v3] kernel/signal.c: fix BUG_ON with SIG128 (MIPS)

[Denys Vlasenko]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/