lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sun, 07 Jun 2009 13:03:50 +0300 From: Avi Kivity <avi@...hat.com> To: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> CC: guillaume.thouvenin@....bull.net, linux-kernel@...r.kernel.org Subject: Re: [2.6.30-rc8 KVM] gcc 3.3 dies at emulate_2op_cl(). Tetsuo Handa wrote: > Avi Kivity wrote: > >> I can eliminate _tmp by using lahf/sahf, but it's not going to be a >> trivial patch. >> > > I don't know what's happening here. > > If I comment out (_dst).bytes == 2 , it compiles. > The problem happens only "w" + "unsigned short" case. > > # diff -urp arch/x86/kvm/x86_emulate.c~ arch/x86/kvm/x86_emulate.c > --- arch/x86/kvm/x86_emulate.c~ 2009-06-03 12:07:25.000000000 +0900 > +++ arch/x86/kvm/x86_emulate.c 2009-06-07 17:52:05.591542272 +0900 > @@ -461,8 +461,8 @@ static u32 group2_table[] = { > do { \ > switch ((_dst).bytes) { \ > case 2: \ > - __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ > - "w", unsigned short); \ > + /* __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ > + "w", unsigned short); */ \ > break; \ > case 4: \ > __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \ > It's a gcc register allocator bug. Bugs don't have to be reasonable. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists