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

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Message-ID: <CACT4Y+bptixoADW1cLtJzbJcHfmEAuLyBSnK9txb6u69fZ3n6w@mail.gmail.com>
Date:   Fri, 27 Apr 2018 18:06:32 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
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 5:41 PM, Borislav Petkov <bp@...en8.de> wrote:
> 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...


find /sys -exec grep "64" {} \; -print