linux-kernel - Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+55aFxU7TArLUdcndeLnhfRKLO-Vu-1d0Q6VPb9NYt+-S-LNg@mail.gmail.com>
Date:   Wed, 7 Feb 2018 10:13:35 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     kbuild test robot <fengguang.wu@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f

Adding more people for this funky warning from the kbuild robot.

Something is confused. UD0 is 0f ff, the bytes after that shouldn't
matter. But I guess they can be interpreted as modrm bytes, and
somebody started doing that.

That said, intel only _documents_ UD2 (0f 0b).

Maybe we should avoid using UD0/UD1 entirely.

              Linus

On Wed, Feb 7, 2018 at 3:44 AM, kbuild test robot
<fengguang.wu@...el.com> wrote:
> tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master
> branch HEAD: a2e5790d841658485d642196dbb0927303d6c22f  Merge branch 'akpm' (patches from Andrew)
>
> Regressions in current branch:
>
> arch/x86/tools/insn_decoder_test: warning: ffffffff810010d7:    0f ff eb                ud0    %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001152:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001275:    0f ff eb                ud0    %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: ffffffff810013fd:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001499:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff812296eb:    0f ff e8                ud0    %eax,%ebp