On Tue, Jan 03, 2017 at 03:14:54PM +0100, Michal Marek wrote:
> The asm-prototypes.h file is used to provide dummy function declarations
> for genksyms, when processing asm files with EXPORT_SYMBOL. Make sure
> that any architecture defines get out of our way. x86 currently has an
> issue with memcpy on 64bit with CONFIG_KMEMCHECK=y and with
> memset/__memset on 32bit:
>
> $ cat init/test.c
> #include <asm/asm-prototypes.h>
> $ make -s init/test.o
> $ make -s init/test.o
> In file included from ./arch/x86/include/asm/string.h:4:0,
> from ./include/linux/string.h:18,
> from ./include/linux/bitmap.h:8,
> from ./include/linux/cpumask.h:11,
> from ./arch/x86/include/asm/cpumask.h:4,
> from ./arch/x86/include/asm/msr.h:10,
> from ./arch/x86/include/asm/processor.h:20,
> from ./arch/x86/include/asm/cpufeature.h:4,
> from ./arch/x86/include/asm/thread_info.h:52,
> from ./include/linux/thread_info.h:25,
> from ./arch/x86/include/asm/preempt.h:6,
> from ./include/linux/preempt.h:59,
> from ./include/linux/spinlock.h:50,
> from ./include/linux/seqlock.h:35,
> from ./include/linux/time.h:5,
> from ./include/uapi/linux/timex.h:56,
> from ./include/linux/timex.h:56,
> from ./include/linux/sched.h:19,
> from ./include/linux/uaccess.h:4,
> from ./arch/x86/include/asm/asm-prototypes.h:2,
> from init/test.c:1:
> ./arch/x86/include/asm/string_64.h:52:47: error: expected declaration
> specifiers or ‘...’ before ‘(’ token
> #define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
> ./include/asm-generic/asm-prototypes.h:6:14: note: in expansion of
> macro ‘memcpy’
> extern void *memcpy(void *, const void *, __kernel_size_t);
>
> ^
> ...
>
> During real build, this manifests itself by genksyms segfaulting.
>
> Reported-by: Borislav Petkov <b...@alien8.de>
... -and-tested-by: ...
For all three.
Thanks!
--
Regards/Gruss,
Boris.
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