Commit 525213f1 authored by Tong Tiangen's avatar Tong Tiangen
Browse files

kasan: add kasan support for memcpy_mcs() 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6AQE8


CVE: NA

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

The function memcpy_mcs() is designed to copy in memory and should be
supported by kasan.

Signed-off-by: default avatarTong Tiangen <tongtiangen@huawei.com>
parent 4a724b4c

mm/kasan/common.c

+12 −0
Original line number Diff line number Diff line
@@ -109,6 +109,18 @@ void *memcpy(void *dest, const void *src, size_t len) 
	return __memcpy(dest, src, len);

}



#ifdef __HAVE_ARCH_MEMCPY_MC

#undef memcpy_mcs

unsigned long memcpy_mcs(void *dest, const void *src, size_t len)

{

	if (!check_memory_region((unsigned long)src, len, false, _RET_IP_) ||

	    !check_memory_region((unsigned long)dest, len, true, _RET_IP_))

		return (unsigned long)len;



	return __memcpy_mcs(dest, src, len);

}

#endif



/*

 * Poisons the shadow memory for 'size' bytes starting from 'addr'.

 * Memory addresses should be aligned to KASAN_SHADOW_SCALE_SIZE.