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@xxxxxxxxxxxxxxx
> > Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
> > ---
> > 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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