Commit 406637c1 authored by Tong Tiangen's avatar Tong Tiangen Committed by Ma Wupeng
Browse files

uaccess: add generic fallback version of copy_mc_to_user() 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GB28


CVE: NA

-------------------------------

x86/powerpc has it's implementation of copy_mc_to_user(), we add generic
fallback in include/linux/uaccess.h prepare for other architechures to
enable CONFIG_ARCH_HAS_COPY_MC.

Signed-off-by: default avatarTong Tiangen <tongtiangen@huawei.com>
parent 54a8cc05

arch/powerpc/include/asm/uaccess.h

+1 −0
Original line number Diff line number Diff line
@@ -388,6 +388,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n) 


	return n;

}

#define copy_mc_to_user copy_mc_to_user

#endif



#ifdef __powerpc64__

arch/x86/include/asm/uaccess.h

+1 −0
Original line number Diff line number Diff line
@@ -447,6 +447,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len); 


unsigned long __must_check

copy_mc_to_user(void *to, const void *from, unsigned len);

#define copy_mc_to_user copy_mc_to_user

#endif



/*

include/linux/uaccess.h

+9 −0
Original line number Diff line number Diff line
@@ -224,6 +224,15 @@ copy_mc_to_kernel(void *dst, const void *src, size_t cnt) 
}

#endif



#ifndef copy_mc_to_user

static inline unsigned long __must_check

copy_mc_to_user(void *dst, const void *src, size_t cnt)

{

	check_object_size(src, cnt, true);

	return raw_copy_to_user(dst, src, cnt);

}

#endif



static __always_inline void pagefault_disabled_inc(void)

{

	current->pagefault_disabled++;