diff options
Diffstat (limited to 'arch/mips/include/asm/checksum.h')
| -rw-r--r-- | arch/mips/include/asm/checksum.h | 44 |
1 files changed, 37 insertions, 7 deletions
diff --git a/arch/mips/include/asm/checksum.h b/arch/mips/include/asm/checksum.h index ac3d2b8a20d..3418c51e115 100644 --- a/arch/mips/include/asm/checksum.h +++ b/arch/mips/include/asm/checksum.h @@ -7,6 +7,7 @@ * Copyright (C) 1999 Silicon Graphics, Inc. * Copyright (C) 2001 Thiemo Seufer. * Copyright (C) 2002 Maciej W. Rozycki + * Copyright (C) 2014 Imagination Technologies Ltd. */ #ifndef _ASM_CHECKSUM_H #define _ASM_CHECKSUM_H @@ -29,9 +30,13 @@ */ __wsum csum_partial(const void *buff, int len, __wsum sum); -__wsum __csum_partial_copy_user(const void *src, void *dst, - int len, __wsum sum, int *err_ptr); +__wsum __csum_partial_copy_kernel(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); +__wsum __csum_partial_copy_from_user(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); +__wsum __csum_partial_copy_to_user(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); /* * this is a new version of the above that records errors it finds in *errp, * but continues and zeros the rest of the buffer. @@ -41,8 +46,26 @@ __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { might_fault(); - return __csum_partial_copy_user((__force void *)src, dst, - len, sum, err_ptr); + if (segment_eq(get_fs(), get_ds())) + return __csum_partial_copy_kernel((__force void *)src, dst, + len, sum, err_ptr); + else + return __csum_partial_copy_from_user((__force void *)src, dst, + len, sum, err_ptr); +} + +#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER +static inline +__wsum csum_and_copy_from_user(const void __user *src, void *dst, + int len, __wsum sum, int *err_ptr) +{ + if (access_ok(VERIFY_READ, src, len)) + return csum_partial_copy_from_user(src, dst, len, sum, + err_ptr); + if (len) + *err_ptr = -EFAULT; + + return sum; } /* @@ -54,9 +77,16 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len, __wsum sum, int *err_ptr) { might_fault(); - if (access_ok(VERIFY_WRITE, dst, len)) - return __csum_partial_copy_user(src, (__force void *)dst, - len, sum, err_ptr); + if (access_ok(VERIFY_WRITE, dst, len)) { + if (segment_eq(get_fs(), get_ds())) + return __csum_partial_copy_kernel(src, + (__force void *)dst, + len, sum, err_ptr); + else + return __csum_partial_copy_to_user(src, + (__force void *)dst, + len, sum, err_ptr); + } if (len) *err_ptr = -EFAULT; |