linux-kernel - Re: [PATCH v2 2/3] x86/traps: Print non-canonical address on #GP

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Message-ID: <20191118173850.GL6363@zn.tnic>
Date:   Mon, 18 Nov 2019 18:38:50 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>, Jann Horn <jannh@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <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 v2 2/3] x86/traps: Print non-canonical address on #GP

On Mon, Nov 18, 2019 at 05:44:07PM +0100, Borislav Petkov wrote:
> [    2.523708] Write protecting the kernel read-only data: 16384k
> [    2.524729] Freeing unused kernel image (text/rodata gap) memory: 2040K
> [    2.525594] Freeing unused kernel image (rodata/data gap) memory: 368K
> [    2.541414] x86/mm: Checked W+X mappings: passed, no W+X pages found.
> 
> <--- important first splat starts here:
> 
> [    2.542218] [*] general protection fault while derefing a non-canonical address 0xdfff000000000001: 0000 [#1] PREEMPT SMP
		  ^

Btw, tglx just suggested on IRC to simply slap the die_counter number here so
that you have

[    2.543343] [1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc8+ #8
[    2.544138] [1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014
...

which also tells you to which splat the line belongs to.

Also useful.

Thx.

-- 
Regards/Gruss,
    Boris.

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