linux-kernel - Re: [PATCH] powerpc/signal32: Fix sigset

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Message-Id: <163714821584.1508509.9112860111598863862.b4-ty@ellerman.id.au>
Date:   Wed, 17 Nov 2021 22:23:35 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Finn Thain <fthain@...ux-m68k.org>,
        Stan Johnson <userm57@...oo.com>,
        "Christopher M . Riedl" <cmr@...escreens.de>
Subject: Re: [PATCH] powerpc/signal32: Fix sigset_t copy

On Mon, 15 Nov 2021 09:52:55 +0100, Christophe Leroy wrote:
> The conversion from __copy_from_user() to __get_user() by
> commit d3ccc9781560 ("powerpc/signal: Use __get_user() to copy
> sigset_t") introduced a regression in __get_user_sigset() for
> powerpc/32. The bug was subsequently moved into
> unsafe_get_user_sigset().
> 
> The bug is due to the copied 64 bit value being truncated to
> 32 bits while being assigned to dst->sig[0]
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/signal32: Fix sigset_t copy
      https://git.kernel.org/powerpc/c/5499802b2284331788a440585869590f1bd63f7f

cheers