linux-kernel - Re: [PATCH v2] x86/dumpstack: don't dump kernel memory based on usermode RIP

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Date:   Wed, 29 Aug 2018 09:09:07 +0200
From:   Borislav Petkov <bp@...e.de>
To:     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>,
        Andy Lutomirski <luto@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>, security@...nel.org
Subject: Re: [PATCH v2] x86/dumpstack: don't dump kernel memory based on
 usermode RIP

On Tue, Aug 28, 2018 at 06:29:43PM +0200, Jann Horn wrote:
> No, you can also get user opcode bytes printed by WARN() and friends.
> When you add a WARN() in the pagefault handler, you get something like

Ok, let's always do the checking then - who knows in what context we
might be dumping opcodes so we better be prepared.

Thx.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--