linux-kernel - Re: WARNING: kernel stack regs has bad 'bp' value (3)

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Date:   Fri, 2 Feb 2018 14:18:29 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+ffa3a158337bbc01ff09@...kaller.appspotmail.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING: kernel stack regs has bad 'bp' value (3)

On Fri, Feb 02, 2018 at 02:57:32PM +0100, Dmitry Vyukov wrote:
> On Fri, Feb 2, 2018 at 2:48 PM, syzbot
> <syzbot+ffa3a158337bbc01ff09@...kaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot hit the following crash on upstream commit
> > 7109a04eae81c41ed529da9f3c48c3655ccea741 (Thu Feb 1 17:37:30 2018 +0000)
> > Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide
> >
> > So far this crash happened 4 times on net-next, upstream.
> > C reproducer is attached.
> > syzkaller reproducer is attached.
> > Raw console output is attached.
> > compiler: gcc (GCC) 7.1.1 20170620
> > .config is attached.
> 
> 
> From suspicious frames I see salsa20_asm_crypt there, so +crypto maintainers.
> 

Looks like the x86 implementations of Salsa20 (both i586 and x86_64) need to be
updated to not use %ebp/%rbp.

- Eric