powerpc: use non-set_fs based maccess routines (c3316525) · Commits · 戴 / test

Provide __get_kernel_nofault and __put_kernel_nofault routines to implement the maccess routines without messing with set_fs and without opening up access to user space. Signed-off-by:

Christoph Hellwig <hch@lst.de> Signed-off-by:

Al Viro <viro@zeniv.linux.org.uk>

arch/powerpc/include/asm/uaccess.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -623,4 +623,20 @@ do { \
		__put_user_goto((u8)(_src + _i), (u8 __user *)(_dst + _i), e);\
		} while (0)

		#define HAVE_GET_KERNEL_NOFAULT

		#define __get_kernel_nofault(dst, src, type, err_label) \
		do { \
		int __kr_err; \
		\
		__get_user_size_allowed(((type )(dst)), (__force type __user *)(src),\
		sizeof(type), __kr_err); \
		if (unlikely(__kr_err)) \
		goto err_label; \
		} while (0)

		#define __put_kernel_nofault(dst, src, type, err_label) \
		__put_user_size_goto(((type )(src)), \
		(__force type __user *)(dst), sizeof(type), err_label)

		#endif /* _ARCH_POWERPC_UACCESS_H */

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