This is a discussion on Re: [openssl.org #1146] [BUG] Segfault on FreeBSD 4.8-RELEASE #0 - Openssl ; Hello! On Thu, 7 Jul 2005, Andy Polyakov via RT wrote: > > >>>>>Sorry, I've forgotten to mention I use 20050627 snapshot and > >>>>>./config -g shared zlib works fine. > > > > > >>Yet I find it a ...
On Thu, 7 Jul 2005, Andy Polyakov via RT wrote:
> >>>>>Sorry, I've forgotten to mention I use 20050627 snapshot and
> >>>>>./config -g shared zlib works fine.
> >>Yet I find it a bit too puzzling... After I've replied I came to realize
> >>that no-sse2/386 shouldn't actually affect the referred test
> >>procedure... Indeed, even though there're SSE2 instructions present in
> >>bn_mul_add_words, they operate on mmx registers and therefore don't
> >>actually require kernel support. Kernel support required for SSE2
> >>instructions operating on 128-bit xmm registers, but not on 64-bit mmx
> >>ones, and therefore if CPUID said SSE2 is available, then
> >>bn_mul_add_words should have worked... So if you can have time I'd still
> >>appreciate if you could collect and send over disassemble output in the
> >>vicinity of segmentation fault, as well as info registers... Once again,
> >>this is optional. A.
> > (gdb) bt
> > #0 0x281330a1 in bn_mul_add_words () from ./libcrypto.so.0.9.8
> > (gdb) info r
> > eax 0x30281d48 807935304
> > (gdb) disassemble
> > Dump of assembler code for function bn_mul_add_words:
> > 0x28133090
: call 0x28133095
> > 0x28133095
: pop %eax
> > 0x28133096
: add $0x163630,%eax
> > 0x2813309b
: mov 0x2cc(%eax),%eax
> > 0x281330a1
: btl $0x1a,(%eax)
> btl? This most likely indicates bug in binutils or run-time linker, as
> it's ld, which is solely responsible for constants above btl and
> run-time linker is responsible for value found at 0x2cc(%eax) location.
How can I check it?
> So that 386/no-sse2 doesn't really have everyting to do with SSE2
> instruction per se, it simply excludes the above snippet and thus avoid
> bug condition. It might be possible to avoid the bug in OpenSSL [is it
> really important?]. Binutils upgrade might help [is it an option?]. Or
> simply avoid -ggdb... A.
It's all possible and bug is not critical for us.
But it happens without -ggdb too.
SY, Dmitry Belyavsky (ICQ UIN 11116575)
OpenSSL Project http://www.openssl.org
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