linux-kernel - Re: [PATCH v6 2/4] x86/traps: Print address on #GP

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Message-ID: <20191211170632.GD14821@zn.tnic>
Date:   Wed, 11 Dec 2019 18:06:32 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jann Horn <jannh@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH v6 2/4] x86/traps: Print address on #GP

On Mon, Dec 09, 2019 at 03:31:18PM +0100, Jann Horn wrote:
>     I have already sent a patch to syzkaller that relaxes their parsing of GPF
>     messages (https://github.com/google/syzkaller/commit/432c7650) such that
>     changes like the one in this patch don't break it.
>     That patch has already made its way into syzbot's syzkaller instances
>     according to <https://syzkaller.appspot.com/upstream>.

Ok, cool.

I still think we should do the oops number marking, though, as it has
more benefits than just syzkaller scanning for it. The first oops has always
been of crucial importance so having the number in there:

[    2.542218] [1] general protection fault while derefing a non-canonical address 0xdfff000000000001: 0000 [#1] PREEMPT SMP
	 	^

would make eyeballing oopses even easier. Basically the same reason why
you're doing this enhancement. :)

So let me know if you don't have time to do it or you don't care about
it etc, and I'll have a look. Independent of those patches, of course -
those look good so far.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette