From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@ozlabs.org
Subject: Re: powerpc/64: Define ILLEGAL_POINTER_VALUE for 64-bit
Date: Sat, 3 Dec 2016 22:28:16 +1100 (AEDT) [thread overview]
Message-ID: <3tW80J5GSnz9t1d@ozlabs.org> (raw)
In-Reply-To: <1479207578-8762-1-git-send-email-mpe@ellerman.id.au>
On Tue, 2016-11-15 at 10:59:38 UTC, Michael Ellerman wrote:
> This is used in poison.h to offset poison values so that they don't
> point directly into user space.
>
> The value we choose sits roughly between user and kernel space, which
> means on their own the poison values don't point anywhere useful. If an
> attacker can cause an access at some offset from the poison value then
> we may still be in trouble, but by putting the poison values between
> user and kernel space we maximise the required size of that offset.
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Applied to powerpc next.
https://git.kernel.org/powerpc/c/f6853eb561fb9bfd56dfe0009f0ea2
cheers
prev parent reply other threads:[~2016-12-03 11:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-15 10:59 [PATCH] powerpc/64: Define ILLEGAL_POINTER_VALUE for 64-bit Michael Ellerman
2016-12-03 11:28 ` Michael Ellerman [this message]
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