next-20201105 - build issue with KASAN on ARM

next-20201105 - build issue with KASAN on ARM

[Valdis Klētnieks]

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commit d6d51a96c7d63b7450860a3037f2d62388286a52
Author: Linus Walleij <linus.walleij@linaro.org>
Date:   Sun Oct 25 23:52:08 2020 +0100

    ARM: 9014/2: Replace string mem* functions for KASan

I'm trying to figure out why this has 3 Tested-By: tags but blows up for fairly obvious
reasons on ARM.....

  CC      arch/arm/boot/compressed/string.o
arch/arm/boot/compressed/string.c:24:1: error: attribute 'alias' argument not a string
 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
 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
 void *__memset(void *s, int c, size_t count) __alias(memset);
 ^~~~
make[2]: *** [scripts/Makefile.build:283: arch/arm/boot/compressed/string.o] Error 1
make[1]: *** [arch/arm/boot/Makefile:64: arch/arm/boot/compressed/vmlinux] Error 2


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Re: next-20201105 - build issue with KASAN on ARM

[Nathan Chancellor]

Hi Valdis,

On Sat, Nov 07, 2020 at 01:33:20PM -0500, Valdis Klētnieks wrote:
> commit d6d51a96c7d63b7450860a3037f2d62388286a52
> Author: Linus Walleij <linus.walleij@linaro.org>
> Date:   Sun Oct 25 23:52:08 2020 +0100
> 
>     ARM: 9014/2: Replace string mem* functions for KASan
> 
> I'm trying to figure out why this has 3 Tested-By: tags but blows up for fairly obvious
> reasons on ARM.....

Because it builds fine if you check out Russell's branch. This build
error only happens because of a treewide change in -mm that was applied
after the ARM merge:

https://lore.kernel.org/linux-arm-kernel/20201106094434.GA3268933@ubuntu-m3-large-x86/

https://lore.kernel.org/linux-arm-kernel/20201106180929.GD2959494@ubuntu-m3-large-x86/

Stephen could apply that diff as a fixup for the -mm patch when he
builds -next or I can send it as a formal patch for him to apply.

>   CC      arch/arm/boot/compressed/string.o
> arch/arm/boot/compressed/string.c:24:1: error: attribute 'alias' argument not a string
>  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
>  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
>  void *__memset(void *s, int c, size_t count) __alias(memset);
>  ^~~~
> make[2]: *** [scripts/Makefile.build:283: arch/arm/boot/compressed/string.o] Error 1
> make[1]: *** [arch/arm/boot/Makefile:64: arch/arm/boot/compressed/vmlinux] Error 2
> 

Cheers,
Nathan

Re: next-20201105 - build issue with KASAN on ARM

[Stephen Rothwell]

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Hi Nathan,

On Sat, 7 Nov 2020 13:04:53 -0700 Nathan Chancellor <natechancellor@gmail.com> wrote:
>
> Because it builds fine if you check out Russell's branch. This build
> error only happens because of a treewide change in -mm that was applied
> after the ARM merge:
> 
> https://lore.kernel.org/linux-arm-kernel/20201106094434.GA3268933@ubuntu-m3-large-x86/
> 
> https://lore.kernel.org/linux-arm-kernel/20201106180929.GD2959494@ubuntu-m3-large-x86/
> 
> Stephen could apply that diff as a fixup for the -mm patch when he
> builds -next or I can send it as a formal patch for him to apply.

I have applied the patch by hand today, but please send a patch to
Andrew pointing out that it should go in his post -next series (or
possibly he should also move
treewide-remove-stringification-from-__alias-macro-definition.patch
into the post -next series).

-- 
Cheers,
Stephen Rothwell

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Re: next-20201105 - build issue with KASAN on ARM

[Nathan Chancellor]

Hi Stephen,

On Mon, Nov 09, 2020 at 09:19:19AM +1100, Stephen Rothwell wrote:
> Hi Nathan,
> 
> On Sat, 7 Nov 2020 13:04:53 -0700 Nathan Chancellor <natechancellor@gmail.com> wrote:
> >
> > Because it builds fine if you check out Russell's branch. This build
> > error only happens because of a treewide change in -mm that was applied
> > after the ARM merge:
> > 
> > https://lore.kernel.org/linux-arm-kernel/20201106094434.GA3268933@ubuntu-m3-large-x86/
> > 
> > https://lore.kernel.org/linux-arm-kernel/20201106180929.GD2959494@ubuntu-m3-large-x86/
> > 
> > Stephen could apply that diff as a fixup for the -mm patch when he
> > builds -next or I can send it as a formal patch for him to apply.
> 
> I have applied the patch by hand today, but please send a patch to
> Andrew pointing out that it should go in his post -next series (or
> possibly he should also move
> treewide-remove-stringification-from-__alias-macro-definition.patch
> into the post -next series).

Ack, thank you for the guidance, as I am unsure how exactly contexual
changes like this are supposed to be handled when dealing with a quilt
series. I will send a formal patch soon.

Cheers,
Nathan

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

[Nathan Chancellor]

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@linaro.org>
Reported-by: Valdis Klētnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---

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

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

[Ard Biesheuvel]

On Mon, 9 Nov 2020 at 01:19, Nathan Chancellor <natechancellor@gmail.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@linaro.org>
> Reported-by: Valdis Klētnieks <valdis.kletnieks@vt.edu>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Acked-by: Ard Biesheuvel <ardb@kernel.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
>

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

[Linus Walleij]

On Mon, Nov 9, 2020 at 1:19 AM Nathan Chancellor
<natechancellor@gmail.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@linaro.org>
> Reported-by: Valdis Klētnieks <valdis.kletnieks@vt.edu>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.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.

I wasn't even aware that there was such a thing as post-next.

Thanks,
Linus Walleij