linux-kernel - Re: [PATCH] powerpc/prom_init: Fix build failure with GCC_PLUGIN_STRUCTLEAK_BYREF

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Message-Id: <165620330350.1934578.13931347836016733313.b4-ty@ellerman.id.au>
Date:   Sun, 26 Jun 2022 10:28:23 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/prom_init: Fix build failure with GCC_PLUGIN_STRUCTLEAK_BYREF_ALL and KASAN

On Fri, 10 Jun 2022 17:43:43 +0200, Christophe Leroy wrote:
> When CONFIG_KASAN is selected, we expect prom_init to use __memset()
> because it is too early to use memset().
> 
> But with CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL, the compiler adds calls
> to memset() to clear objects on stack, hence the following failure:
> 
> 	  PROMCHK arch/powerpc/kernel/prom_init_check
> 	Error: External symbol 'memset' referenced from prom_init.c
> 	make[2]: *** [arch/powerpc/kernel/Makefile:204 : arch/powerpc/kernel/prom_init_check] Erreur 1
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/prom_init: Fix build failure with GCC_PLUGIN_STRUCTLEAK_BYREF_ALL and KASAN
      https://git.kernel.org/powerpc/c/ca5dabcff1df6bc8c413922b5fa63cc602858803

cheers