linux-kernel - Re: [PATCH v2] powerpc: Avoid link stack corruption in misc asm functions

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Message-Id: <163007015730.52768.16250473929486782356.b4-ty@ellerman.id.au>
Date:   Fri, 27 Aug 2021 23:15:57 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc: Avoid link stack corruption in misc asm functions

On Tue, 24 Aug 2021 07:56:35 +0000 (UTC), Christophe Leroy wrote:
> bl;mflr is used at several places to get code position.
> 
> Use bcl 20,31,+4 instead of bl in order to preserve link stack.
> 
> See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption
> in __get_datapage()") for details.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc: Avoid link stack corruption in misc asm functions
      https://git.kernel.org/powerpc/c/33e1402435cb9f3021439a15935ea2dc69ec1844

cheers