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authorMarkos Chandras <markos.chandras@imgtec.com>2014-01-03 15:55:02 +0100
committerRalf Baechle <ralf@linux-mips.org>2014-03-26 23:09:16 +0100
commite3a9b07a9caf4e490eee2c0645530cdc80a685f2 (patch)
tree3ffe0996be570d0767da8e73bf90628801e2ec53 /arch/mips/include/asm/uaccess.h
parentMIPS: asm: uaccess: Add EVA support to copy_{in, to,from}_user (diff)
downloadlinux-e3a9b07a9caf4e490eee2c0645530cdc80a685f2.tar.xz
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MIPS: asm: uaccess: Add EVA support for str*_user operations
The str*_user functions are used to securely access NULL terminated strings from userland. Therefore, it's necessary to use the appropriate EVA function. However, if the string is in kernel space, then the normal instructions are being used to access it. The __str*_kernel_asm and __str*_user_asm symbols are the same for non-EVA mode so there is no functional change for the non-EVA kernels. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Diffstat (limited to 'arch/mips/include/asm/uaccess.h')
-rw-r--r--arch/mips/include/asm/uaccess.h172
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;
}