linux-kernel - Re: stack out-of-bounds write in mce-inject.c

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Message-ID: <20180427154115.GF15229@pd.tnic>
Date:   Fri, 27 Apr 2018 17:41:15 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     tony.luck@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        linux-edac@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: stack out-of-bounds write in mce-inject.c

On Fri, Apr 27, 2018 at 05:24:24PM +0200, Dmitry Vyukov wrote:
> Hi,
> 
> Opening /sys/kernel/debug/mce-inject/flags overwrites stack:
> 
> ==================================================================
> BUG: KASAN: stack-out-of-bounds in vsnprintf+0x1b23/0x1b40 lib/vsprintf.c:2365
> Write of size 1 at addr ffff8800627b7abb by task egrep/4309

How do you trigger this exactly?

You grep it for something apparently...

Thx.

-- 
Regards/Gruss,
    Boris.

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