On Sun, Jun 19, 2016 at 11:19:14PM +0530, Naveen N. Rao wrote:
> On 2016/06/17 10:00AM, Thadeu Lima de Souza Cascardo wrote:
> > On Fri, Jun 17, 2016 at 10:53:21PM +1000, Michael Ellerman wrote:
> > > On Tue, 2016-07-06 at 13:32:23 UTC, "Naveen N. Rao" wrote:
> > > > diff --git a/arch/powerpc/net/bpf_jit_comp64.c
> > > > b/arch/powerpc/net/bpf_jit_comp64.c
> > > > new file mode 100644
> > > > index 0000000..954ff53
> > > > --- /dev/null
> > > > +++ b/arch/powerpc/net/bpf_jit_comp64.c
> > > > @@ -0,0 +1,956 @@
> > > ...
> > > > +
> > > > +static void bpf_jit_fill_ill_insns(void *area, unsigned int size)
> > > > +{
> > > > + int *p = area;
> > > > +
> > > > + /* Fill whole space with trap instructions */
> > > > + while (p < (int *)((char *)area + size))
> > > > + *p++ = BREAKPOINT_INSTRUCTION;
> > > > +}
> > >
> > > This breaks the build for some configs, presumably you're missing a
> > > header:
> > >
> > > arch/powerpc/net/bpf_jit_comp64.c:30:10: error:
> > > 'BREAKPOINT_INSTRUCTION' undeclared (first use in this function)
> > >
> > > http://kisskb.ellerman.id.au/kisskb/buildresult/12720611/
> > >
> > > cheers
> >
> > Hi, Michael and Naveen.
> >
> > I noticed independently that there is a problem with BPF JIT and ABIv2, and
> > worked out the patch below before I noticed Naveen's patchset and the latest
> > changes in ppc tree for a better way to check for ABI versions.
> >
> > However, since the issue described below affect mainline and stable kernels,
> > would you consider applying it before merging your two patchsets, so that
> > we can
> > more easily backport the fix?
>
> Hi Cascardo,
> Given that this has been broken on ABIv2 since forever, I didn't bother
> fixing it. But, I can see why this would be a good thing to have for
> -stable and existing distros. However, while your patch below may fix
> the crash you're seeing on ppc64le, it is not sufficient -- you'll need
> changes in bpf_jit_asm.S as well.
Hi, Naveen.
Any tips on how to exercise possible issues there? Or what changes you think
would be sufficient?
I will see what I can find by myself, but would appreciate any help.
Regards.
Cascardo.
>
> Regards,
> Naveen
>
