linux-kernel - Re: [PATCH] powerpc/uaccess: Fix __get_user() with CONFIG_CC_HAS_ASM_GOTO

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Message-Id: <162111863389.1890426.7179342188504537886.b4-ty@ellerman.id.au>
Date:   Sun, 16 May 2021 08:43:53 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/uaccess: Fix __get_user() with CONFIG_CC_HAS_ASM_GOTO_OUTPUT

On Sat, 8 May 2021 09:25:32 +0000 (UTC), Christophe Leroy wrote:
> Building kernel mainline with GCC 11 leads to following failure
> when starting 'init':
> 
>   init[1]: bad frame in sys_sigreturn: 7ff5a900 nip 001083cc lr 001083c4
>   Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> 
> This is an issue due to a segfault happening in
> __unsafe_restore_general_regs() in a loop copying registers from user
> to kernel:
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/uaccess: Fix __get_user() with CONFIG_CC_HAS_ASM_GOTO_OUTPUT
      https://git.kernel.org/powerpc/c/7315e457d6bc342d06ba0b7ee498221c5237a547

cheers