linux-kernel - Re: [PATCH] parisc: fix a bug when syscall number of tracee is __NR_Linux

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Message-ID: <20160427032826.GA24101@altlinux.org>
Date:	Wed, 27 Apr 2016 06:28:26 +0300
From:	"Dmitry V. Levin" <ldv@...linux.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] parisc: fix a bug when syscall number of tracee is __NR_Linux_syscalls

On Tue, Apr 26, 2016 at 10:45:11PM -0400, Mike Frysinger wrote:
> On 27 Apr 2016 04:56, Dmitry V. Levin wrote:
> > Do not load one entry beyond the end of the syscall table when the
> > syscall number of a traced process equals to __NR_Linux_syscalls.
> > Similar bug with regular processes was fixed by commit 3bb457af4fa8
> > ("[PARISC] Fix bug when syscall nr is __NR_Linux_syscalls").
> > 
> > This bug was found by strace test suite.
> > 
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> > ---
> >  arch/parisc/kernel/syscall.S | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
> > index c976ebf..57b4836 100644
> > --- a/arch/parisc/kernel/syscall.S
> > +++ b/arch/parisc/kernel/syscall.S
> > @@ -344,7 +344,7 @@ tracesys_next:
> >  #endif
> >  
> >  	cmpib,COND(=),n -1,%r20,tracesys_exit /* seccomp may have returned -1 */
> > -	comiclr,>>=	__NR_Linux_syscalls, %r20, %r0
> > +	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
> >  	b,n	.Ltracesys_nosys
> >  
> >  	LDREGX  %r20(%r19), %r19
> 
> i've deployd your fix to hake, so feel free to give the tests another
> run to try and crash the box :).

With this fix the box no longer crashes.


-- 
ldv

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