linux-kernel - Re: WARNING: kernel stack regs has bad 'bp' value (2)

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Message-ID: <CACT4Y+aju=eN--HZK5jbK2B0A=nxcWAC9-cuF9BZQud5XOX6iA@mail.gmail.com>
Date:   Thu, 28 Dec 2017 08:30:44 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     syzbot 
        <bot+e01a53d277c86c4e61e7c84ec83432ed395c7df8@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "H. Peter Anvin" <hpa@...or.com>, linux-crypto@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: WARNING: kernel stack regs has bad 'bp' value (2)

On Wed, Dec 27, 2017 at 7:29 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Thu, Nov 30, 2017 at 10:17 AM, Eric Biggers <ebiggers3@...il.com> wrote:
>> On Tue, Nov 28, 2017 at 10:36:01AM -0800, syzbot wrote:
>>> WARNING: kernel stack regs at ffff8801c1e5f468 in syzkaller196611:6199 has
>>> bad 'bp' value 0000000000000001
>>> unwind stack type:0 next_sp:          (null) mask:0x6 graph_idx:0
>>> ffff8801db4075a8: ffff8801db407630 (0xffff8801db407630)
>>> ffff8801db4075b0: ffffffff8128a84e (__save_stack_trace+0x6e/0xd0)
>>> ffff8801db4075b8: 0000000000000000 ...
>>> ffff8801db4075c0: ffff8801c1e58000 (0xffff8801c1e58000)
>>> ffff8801db4075c8: ffff8801c1e60000 (0xffff8801c1e60000)
>>> ffff8801db4075d0: 0000000000000000 ...
>>> ffff8801db4075d8: 0000000000000006 (0x6)
>>> ffff8801db4075e0: ffff8801c1e4e000 (0xffff8801c1e4e000)
>>> ffff8801db4075e8: 0000010100000000 (0x10100000000)
>>> ffff8801db4075f0: 0000000000000000 ...
>>> ffff8801db4075f8: ffff8801db4075a8 (0xffff8801db4075a8)
>>> ffff8801db407600: ffffffff8134ff7d (__twofish_enc_blk_3way+0x1b1d/0x1b30)
>>
>> Looks like the x86_64 "3 way" version of Twofish (twofish-x86_64-asm_64-3way.S)
>> needs to be updated to not use %rbp.
>
>
> This is what is supposed to be fixed with "crypto: x86/twofish-3way -
> Fix %rbp usage", right? Was it merged anywhere?
> This is one of top crashers with 15K crashes.


#syz fix: crypto: x86/twofish-3way - Fix %rbp usage