linux-kernel - Re: [PATCH] powerpc/mm: don't log user reads to 0xffffffff

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Message-Id: <486sDm0x6Cz9sRl@ozlabs.org>
Date:   Wed, 29 Jan 2020 16:17:28 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/mm: don't log user reads to 0xffffffff

On Mon, 2019-12-23 at 07:54:22 UTC, Christophe Leroy wrote:
> Running vdsotest leaves many times the following log:
> 
> [   79.629901] vdsotest[396]: User access of kernel address (ffffffff) - exploit attempt? (uid: 0)
> 
> A pointer set to (-1) is likely a programming error similar to
> a NULL pointer and is not worth logging as an exploit attempt.
> 
> Don't log user accesses to 0xffffffff.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87

cheers