linux-kernel - Re: [PATCH] ARM: boot: Quote aliased symbol names in string.c

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Date:   Mon, 9 Nov 2020 08:40:19 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Abbott Liu <liuwenliang@...wei.com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Joe Perches <joe@...ches.com>,
        Russell King <linux@...linux.org.uk>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Valdis Klētnieks <valdis.kletnieks@...edu>
Subject: Re: [PATCH] ARM: boot: Quote aliased symbol names in string.c

On Mon, 9 Nov 2020 at 01:19, Nathan Chancellor <natechancellor@...il.com> wrote:
>
> Patch "treewide: Remove stringification from __alias macro definition"
> causes arguments to __alias to no longer be quoted automatically, which
> breaks CONFIG_KASAN on ARM after commit d6d51a96c7d6 ("ARM: 9014/2:
> Replace string mem* functions for KASan"):
>
> arch/arm/boot/compressed/string.c:24:1: error: attribute 'alias' argument not a string
>    24 | void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
>       | ^~~~
> arch/arm/boot/compressed/string.c:25:1: error: attribute 'alias' argument not a string
>    25 | void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
>       | ^~~~
> arch/arm/boot/compressed/string.c:26:1: error: attribute 'alias' argument not a string
>    26 | void *__memset(void *s, int c, size_t count) __alias(memset);
>       | ^~~~
> make[3]: *** [scripts/Makefile.build:283: arch/arm/boot/compressed/string.o] Error 1
>
> Quote the names like the treewide patch does so there is no more error.
>
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Reported-by: Valdis Klētnieks <valdis.kletnieks@...edu>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Ard Biesheuvel <ardb@...nel.org>

> ---
>
> Hi Andrew,
>
> Stephen said I should send this along to you so that it can be applied
> as part of the post -next series. Please let me know if you need any
> more information or clarification, I tried to document it succinctly in
> the commit message.
>
> Cheers,
> Nathan
>
>  arch/arm/boot/compressed/string.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/boot/compressed/string.c b/arch/arm/boot/compressed/string.c
> index 8c0fa276d994..cc6198f8a348 100644
> --- a/arch/arm/boot/compressed/string.c
> +++ b/arch/arm/boot/compressed/string.c
> @@ -21,9 +21,9 @@
>  #undef memcpy
>  #undef memmove
>  #undef memset
> -void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
> -void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
> -void *__memset(void *s, int c, size_t count) __alias(memset);
> +void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias("memcpy");
> +void *__memmove(void *__dest, __const void *__src, size_t count) __alias("memmove");
> +void *__memset(void *s, int c, size_t count) __alias("memset");
>  #endif
>
>  void *memcpy(void *__dest, __const void *__src, size_t __n)
> --
> 2.29.2
>