linux-hardening - mainline build failure of powerpc allmodconfig for prom_init

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Message-ID: <Ys/aDKZNhhsENH9S@debian>
Date:   Thu, 14 Jul 2022 09:55:40 +0100
From:   "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Kees Cook <keescook@...omium.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: mainline build failure of powerpc allmodconfig for prom_init_check

Hi All,

Not sure if it has been reported before but the latest mainline kernel
branch fails to build for powerpc allmodconfig with gcc-12 and the error is:

Error: External symbol 'memset' referenced from prom_init.c
make[2]: *** [arch/powerpc/kernel/Makefile:204: arch/powerpc/kernel/prom_init_check] Error 1

The commit ca5dabcff1df ("powerpc/prom_init: Fix build failure with
GCC_PLUGIN_STRUCTLEAK_BYREF_ALL and KASAN") looks similar but the error
is still there with gcc-12.

Note: I don't see this error with gcc-11.

I will be happy to test any patch or provide any extra log if needed.

--
Regards
Sudip