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powerpc: use non-set_fs based maccess routines 

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>
This commit is contained in:
Christoph Hellwig 2020-09-03 16:22:41 +02:00 committed by Al Viro
parent 47058bb54b
commit c331652534
1 changed files with 16 additions and 0 deletions
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16
arch/powerpc/include/asm/uaccess.h
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@ -623,4 +623,20 @@ do { \
__put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\ __put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\
} while (0) } 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 */ #endif /* _ARCH_POWERPC_UACCESS_H */