Commit 9466c179 authored by Christopher M. Riedl's avatar Christopher M. Riedl Committed by Michael Ellerman
Browse files

powerpc/uaccess: Add unsafe_copy_from_user() 



Use the same approach as unsafe_copy_to_user() but instead call
unsafe_get_user() in a loop.

Signed-off-by: default avatarChristopher M. Riedl <cmr@codefail.de>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210227011259.11992-2-cmr@codefail.de
parent deb9b13e

arch/powerpc/include/asm/uaccess.h

+21 −0
Original line number Diff line number Diff line
@@ -486,6 +486,27 @@ user_write_access_begin(const void __user *ptr, size_t len) 
#define unsafe_put_user(x, p, e) \

	__unsafe_put_user_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)



#define unsafe_copy_from_user(d, s, l, e) \

do {											\

	u8 *_dst = (u8 *)(d);								\

	const u8 __user *_src = (const u8 __user *)(s);					\

	size_t _len = (l);								\

	int _i;										\

											\

	for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long))		\

		unsafe_get_user(*(long *)(_dst + _i), (long __user *)(_src + _i), e);	\

	if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) {					\

		unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e);	\

		_i += 4;								\

	}										\

	if (_len & 2) {									\

		unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e);	\

		_i += 2;								\

	}										\

	if (_len & 1)									\

		unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e);	\

} while (0)



#define unsafe_copy_to_user(d, s, l, e) \

do {									\

	u8 __user *_dst = (u8 __user *)(d);				\