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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-09 19:28:23 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-13 17:50:18 -0400 |
| commit | 8630c32275bac2de6ffb8aea9d9b11663e7ad28e (patch) | |
| tree | 93800a44bb196d8eb11b2ae0d7d2a810dc0883dd /arch/avr32/include/asm/uaccess.h | |
| parent | e98b9e37ae04562d52c96f46b3cf4c2e80222dc1 (diff) | |
| download | linux-8630c32275bac2de6ffb8aea9d9b11663e7ad28e.tar.gz linux-8630c32275bac2de6ffb8aea9d9b11663e7ad28e.tar.bz2 linux-8630c32275bac2de6ffb8aea9d9b11663e7ad28e.zip | |
avr32: fix copy_from_user()
really ugly, but apparently avr32 compilers turns access_ok() into
something so bad that they want it in assembler. Left that way,
zeroing added in inline wrapper.
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/avr32/include/asm/uaccess.h')
| -rw-r--r-- | arch/avr32/include/asm/uaccess.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/avr32/include/asm/uaccess.h b/arch/avr32/include/asm/uaccess.h index 68cf638faf48..b1ec1fa06463 100644 --- a/arch/avr32/include/asm/uaccess.h +++ b/arch/avr32/include/asm/uaccess.h @@ -74,7 +74,7 @@ extern __kernel_size_t __copy_user(void *to, const void *from, extern __kernel_size_t copy_to_user(void __user *to, const void *from, __kernel_size_t n); -extern __kernel_size_t copy_from_user(void *to, const void __user *from, +extern __kernel_size_t ___copy_from_user(void *to, const void __user *from, __kernel_size_t n); static inline __kernel_size_t __copy_to_user(void __user *to, const void *from, @@ -88,6 +88,15 @@ static inline __kernel_size_t __copy_from_user(void *to, { return __copy_user(to, (const void __force *)from, n); } +static inline __kernel_size_t copy_from_user(void *to, + const void __user *from, + __kernel_size_t n) +{ + size_t res = ___copy_from_user(to, from, n); + if (unlikely(res)) + memset(to + (n - res), 0, res); + return res; +} #define __copy_to_user_inatomic __copy_to_user #define __copy_from_user_inatomic __copy_from_user |