On Wed, Oct 07, 2020 at 06:45:36PM +0200, Borislav Petkov wrote:
> It doesn't look like it is toolchain-specific and in both cases,
> copy_mc_fragile's checksum is 0.
>
> SUSE Leap 15.1:
>
> Name : binutils
> Version : 2.32-lp151.3.6.1
>
> $ grep -E "(copy_mc_fragile|copy_user_generic_unrolled)" Module.symvers
> 0x00000000 copy_mc_fragile vmlinux EXPORT_SYMBOL_GPL
> 0xecdcabd2 copy_user_generic_unrolled vmlinux EXPORT_SYMBOL
>
> debian testing:
>
> Package: binutils
> Version: 2.35-2
>
> $ grep -E "(copy_mc_fragile|copy_user_generic_unrolled)" Module.symvers
> 0x00000000 copy_mc_fragile vmlinux EXPORT_SYMBOL_GPL
> 0xecdcabd2 copy_user_generic_unrolled vmlinux EXPORT_SYMBOL
Ok, I think I have it:
---
From: Borislav Petkov <bp@xxxxxxx>
Date: Wed, 7 Oct 2020 18:55:35 +0200
Subject: [PATCH] x86/mce: Allow for copy_mc_fragile symbol checksum to be generated
Add asm/mce.h to asm/asm-prototypes.h so that that asm symbol's checksum
can be generated in order to support CONFIG_MODVERSIONS with it and fix:
WARNING: modpost: EXPORT symbol "copy_mc_fragile" [vmlinux] version \
generation failed, symbol will not be versioned.
For reference see:
4efca4ed05cb ("kbuild: modversions for EXPORT_SYMBOL() for asm")
334bb7738764 ("x86/kbuild: enable modversions for symbols exported from asm")
Fixes: ec6347bb4339 ("x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()")
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/include/asm/asm-prototypes.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/include/asm/asm-prototypes.h b/arch/x86/include/asm/asm-prototypes.h
index 5a42f9206138..51e2bf27cc9b 100644
--- a/arch/x86/include/asm/asm-prototypes.h
+++ b/arch/x86/include/asm/asm-prototypes.h
@@ -5,6 +5,7 @@
#include <asm/string.h>
#include <asm/page.h>
#include <asm/checksum.h>
+#include <asm/mce.h>
#include <asm-generic/asm-prototypes.h>
--
2.21.0
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
