lkml.org 
[lkml]   [2023]   [Jun]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] x86: Fix build of UML with KASAN
On Fri, 9 Jun 2023 at 19:19, Vincent Whitchurch
<vincent.whitchurch@axis.com> wrote:
>
> Building UML with KASAN fails since commit 69d4c0d32186 ("entry, kasan,
> x86: Disallow overriding mem*() functions") with the following errors:
>
> $ tools/testing/kunit/kunit.py run --kconfig_add CONFIG_KASAN=y
> ...
> ld: mm/kasan/shadow.o: in function `memset':
> shadow.c:(.text+0x40): multiple definition of `memset';
> arch/x86/lib/memset_64.o:(.noinstr.text+0x0): first defined here
> ld: mm/kasan/shadow.o: in function `memmove':
> shadow.c:(.text+0x90): multiple definition of `memmove';
> arch/x86/lib/memmove_64.o:(.noinstr.text+0x0): first defined here
> ld: mm/kasan/shadow.o: in function `memcpy':
> shadow.c:(.text+0x110): multiple definition of `memcpy';
> arch/x86/lib/memcpy_64.o:(.noinstr.text+0x0): first defined here
>
> If I'm reading that commit right, the !GENERIC_ENTRY case is still
> supposed to be allowed to override the mem*() functions, so use weak
> aliases in that case.
>
> Fixes: 69d4c0d32186 ("entry, kasan, x86: Disallow overriding mem*() functions")
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
> ---

Thanks: I stumbled into this the other day and ran out of time to debug it.

I've tested that it works here.

Tested-by: David Gow <davidgow@google.com>

Cheers,
-- David

> arch/x86/lib/memcpy_64.S | 4 ++++
> arch/x86/lib/memmove_64.S | 4 ++++
> arch/x86/lib/memset_64.S | 4 ++++
> 3 files changed, 12 insertions(+)
>
> diff --git a/arch/x86/lib/memcpy_64.S b/arch/x86/lib/memcpy_64.S
> index 8f95fb267caa7..5dc265b36ef0b 100644
> --- a/arch/x86/lib/memcpy_64.S
> +++ b/arch/x86/lib/memcpy_64.S
> @@ -40,7 +40,11 @@ SYM_TYPED_FUNC_START(__memcpy)
> SYM_FUNC_END(__memcpy)
> EXPORT_SYMBOL(__memcpy)
>
> +#ifdef CONFIG_GENERIC_ENTRY
> SYM_FUNC_ALIAS(memcpy, __memcpy)
> +#else
> +SYM_FUNC_ALIAS_WEAK(memcpy, __memcpy)
> +#endif
> EXPORT_SYMBOL(memcpy)
>
> SYM_FUNC_START_LOCAL(memcpy_orig)
> diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S
> index 02661861e5dd9..3b1a02357fb29 100644
> --- a/arch/x86/lib/memmove_64.S
> +++ b/arch/x86/lib/memmove_64.S
> @@ -215,5 +215,9 @@ SYM_FUNC_START(__memmove)
> SYM_FUNC_END(__memmove)
> EXPORT_SYMBOL(__memmove)
>
> +#ifdef CONFIG_GENERIC_ENTRY
> SYM_FUNC_ALIAS(memmove, __memmove)
> +#else
> +SYM_FUNC_ALIAS_WEAK(memmove, __memmove)
> +#endif
> EXPORT_SYMBOL(memmove)
> diff --git a/arch/x86/lib/memset_64.S b/arch/x86/lib/memset_64.S
> index 7c59a704c4584..fe27538a355db 100644
> --- a/arch/x86/lib/memset_64.S
> +++ b/arch/x86/lib/memset_64.S
> @@ -40,7 +40,11 @@ SYM_FUNC_START(__memset)
> SYM_FUNC_END(__memset)
> EXPORT_SYMBOL(__memset)
>
> +#ifdef CONFIG_GENERIC_ENTRY
> SYM_FUNC_ALIAS(memset, __memset)
> +#else
> +SYM_FUNC_ALIAS_WEAK(memset, __memset)
> +#endif
> EXPORT_SYMBOL(memset)
>
> SYM_FUNC_START_LOCAL(memset_orig)
>
> ---
> base-commit: 9561de3a55bed6bdd44a12820ba81ec416e705a7
> change-id: 20230609-uml-kasan-2392dd4c3858
>
> Best regards,
> --
> Vincent Whitchurch <vincent.whitchurch@axis.com>
>
> --
> You received this message because you are subscribed to the Google Groups "kasan-dev" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20230609-uml-kasan-v1-1-5fac8d409d4f%40axis.com.
[unhandled content-type:application/pkcs7-signature]
\
 
 \ /
  Last update: 2023-06-10 10:36    [W:0.187 / U:1.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site