diff options
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/uaccess.h | 172 |
1 files changed, 119 insertions, 53 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index 98f4a7934529..a10951090234 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -1246,16 +1246,28 @@ __strncpy_from_user(char *__to, const char __user *__from, long __len) { long res; - might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - "move\t$5, %2\n\t" - "move\t$6, %3\n\t" - __MODULE_JAL(__strncpy_from_user_nocheck_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (__to), "r" (__from), "r" (__len) - : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + "move\t$6, %3\n\t" + __MODULE_JAL(__strncpy_from_kernel_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (__to), "r" (__from), "r" (__len) + : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + } else { + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + "move\t$6, %3\n\t" + __MODULE_JAL(__strncpy_from_user_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (__to), "r" (__from), "r" (__len) + : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + } return res; } @@ -1283,16 +1295,28 @@ strncpy_from_user(char *__to, const char __user *__from, long __len) { long res; - might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - "move\t$5, %2\n\t" - "move\t$6, %3\n\t" - __MODULE_JAL(__strncpy_from_user_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (__to), "r" (__from), "r" (__len) - : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + "move\t$6, %3\n\t" + __MODULE_JAL(__strncpy_from_kernel_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (__to), "r" (__from), "r" (__len) + : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + } else { + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + "move\t$6, %3\n\t" + __MODULE_JAL(__strncpy_from_user_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (__to), "r" (__from), "r" (__len) + : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + } return res; } @@ -1302,14 +1326,24 @@ static inline long __strlen_user(const char __user *s) { long res; - might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - __MODULE_JAL(__strlen_user_nocheck_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (s) - : "$2", "$4", __UA_t0, "$31"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + __MODULE_JAL(__strlen_kernel_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s) + : "$2", "$4", __UA_t0, "$31"); + } else { + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + __MODULE_JAL(__strlen_user_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s) + : "$2", "$4", __UA_t0, "$31"); + } return res; } @@ -1332,14 +1366,24 @@ static inline long strlen_user(const char __user *s) { long res; - might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - __MODULE_JAL(__strlen_user_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (s) - : "$2", "$4", __UA_t0, "$31"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + __MODULE_JAL(__strlen_kernel_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s) + : "$2", "$4", __UA_t0, "$31"); + } else { + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + __MODULE_JAL(__strlen_kernel_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s) + : "$2", "$4", __UA_t0, "$31"); + } return res; } @@ -1349,15 +1393,26 @@ static inline long __strnlen_user(const char __user *s, long n) { long res; - might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - "move\t$5, %2\n\t" - __MODULE_JAL(__strnlen_user_nocheck_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (s), "r" (n) - : "$2", "$4", "$5", __UA_t0, "$31"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + __MODULE_JAL(__strnlen_kernel_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s), "r" (n) + : "$2", "$4", "$5", __UA_t0, "$31"); + } else { + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + __MODULE_JAL(__strnlen_user_nocheck_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s), "r" (n) + : "$2", "$4", "$5", __UA_t0, "$31"); + } return res; } @@ -1381,14 +1436,25 @@ static inline long strnlen_user(const char __user *s, long n) long res; might_fault(); - __asm__ __volatile__( - "move\t$4, %1\n\t" - "move\t$5, %2\n\t" - __MODULE_JAL(__strnlen_user_asm) - "move\t%0, $2" - : "=r" (res) - : "r" (s), "r" (n) - : "$2", "$4", "$5", __UA_t0, "$31"); + if (segment_eq(get_fs(), get_ds())) { + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + __MODULE_JAL(__strnlen_kernel_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s), "r" (n) + : "$2", "$4", "$5", __UA_t0, "$31"); + } else { + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + __MODULE_JAL(__strnlen_user_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s), "r" (n) + : "$2", "$4", "$5", __UA_t0, "$31"); + } return res; } |