linux-kernel - Re: KASAN: alloca-out-of-bounds Read in unwind_next

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Date:   Fri, 6 Apr 2018 11:53:38 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+9d1d9866b0b8ee6e0a8c@...kaller.appspotmail.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: KASAN: alloca-out-of-bounds Read in unwind_next_frame

On Fri, Apr 06, 2018 at 05:40:01PM +0200, Dmitry Vyukov wrote:
> > So at first glance it seemed like a race condition.  However, the
> > unwinder was only trying to dereference the frame pointer (RBP:
> > ffff8801b05e67f8), which should have never been poisoned in the first
> > place.
> >
> > So it looks like a bug in the KASAN alloca poisoning.
> 
> Hi Josh,
> 
> You seen my previous message, right? Or was it lost somehow?
> 
> https://groups.google.com/d/msg/syzkaller-bugs/IcKqxHzhmQc/KAL6o7tOCAAJ

Oops, you're right, I missed it.  Seems like we came to the same
conclusion anyway :-)

-- 
Josh