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

[Ard Biesheuvel]

On Mon, 9 Nov 2020 at 01:19, Nathan Chancellor <natechancellor@xxxxxxxxx> 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@xxxxxxxxxx>
> Reported-by: Valdis Klētnieks <valdis.kletnieks@xxxxxx>
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>

Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>

> ---
>
> 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
>