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Diffstat (limited to 'arch/arm/include/asm/uaccess.h')
-rw-r--r--arch/arm/include/asm/uaccess.h89
1 files changed, 51 insertions, 38 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 71f6536d17a..7e1f76027f6 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -101,28 +101,39 @@ extern int __get_user_1(void *);
extern int __get_user_2(void *);
extern int __get_user_4(void *);
-#define __get_user_x(__r2,__p,__e,__s,__i...) \
+#define __GUP_CLOBBER_1 "lr", "cc"
+#ifdef CONFIG_CPU_USE_DOMAINS
+#define __GUP_CLOBBER_2 "ip", "lr", "cc"
+#else
+#define __GUP_CLOBBER_2 "lr", "cc"
+#endif
+#define __GUP_CLOBBER_4 "lr", "cc"
+
+#define __get_user_x(__r2,__p,__e,__l,__s) \
__asm__ __volatile__ ( \
__asmeq("%0", "r0") __asmeq("%1", "r2") \
+ __asmeq("%3", "r1") \
"bl __get_user_" #__s \
: "=&r" (__e), "=r" (__r2) \
- : "0" (__p) \
- : __i, "cc")
+ : "0" (__p), "r" (__l) \
+ : __GUP_CLOBBER_##__s)
-#define get_user(x,p) \
+#define __get_user_check(x,p) \
({ \
+ unsigned long __limit = current_thread_info()->addr_limit - 1; \
register const typeof(*(p)) __user *__p asm("r0") = (p);\
register unsigned long __r2 asm("r2"); \
+ register unsigned long __l asm("r1") = __limit; \
register int __e asm("r0"); \
switch (sizeof(*(__p))) { \
case 1: \
- __get_user_x(__r2, __p, __e, 1, "lr"); \
- break; \
+ __get_user_x(__r2, __p, __e, __l, 1); \
+ break; \
case 2: \
- __get_user_x(__r2, __p, __e, 2, "r3", "lr"); \
+ __get_user_x(__r2, __p, __e, __l, 2); \
break; \
case 4: \
- __get_user_x(__r2, __p, __e, 4, "lr"); \
+ __get_user_x(__r2, __p, __e, __l, 4); \
break; \
default: __e = __get_user_bad(); break; \
} \
@@ -130,42 +141,57 @@ extern int __get_user_4(void *);
__e; \
})
+#define get_user(x,p) \
+ ({ \
+ might_fault(); \
+ __get_user_check(x,p); \
+ })
+
extern int __put_user_1(void *, unsigned int);
extern int __put_user_2(void *, unsigned int);
extern int __put_user_4(void *, unsigned int);
extern int __put_user_8(void *, unsigned long long);
-#define __put_user_x(__r2,__p,__e,__s) \
+#define __put_user_x(__r2,__p,__e,__l,__s) \
__asm__ __volatile__ ( \
__asmeq("%0", "r0") __asmeq("%2", "r2") \
+ __asmeq("%3", "r1") \
"bl __put_user_" #__s \
: "=&r" (__e) \
- : "0" (__p), "r" (__r2) \
+ : "0" (__p), "r" (__r2), "r" (__l) \
: "ip", "lr", "cc")
-#define put_user(x,p) \
+#define __put_user_check(x,p) \
({ \
+ unsigned long __limit = current_thread_info()->addr_limit - 1; \
register const typeof(*(p)) __r2 asm("r2") = (x); \
register const typeof(*(p)) __user *__p asm("r0") = (p);\
+ register unsigned long __l asm("r1") = __limit; \
register int __e asm("r0"); \
switch (sizeof(*(__p))) { \
case 1: \
- __put_user_x(__r2, __p, __e, 1); \
+ __put_user_x(__r2, __p, __e, __l, 1); \
break; \
case 2: \
- __put_user_x(__r2, __p, __e, 2); \
+ __put_user_x(__r2, __p, __e, __l, 2); \
break; \
case 4: \
- __put_user_x(__r2, __p, __e, 4); \
+ __put_user_x(__r2, __p, __e, __l, 4); \
break; \
case 8: \
- __put_user_x(__r2, __p, __e, 8); \
+ __put_user_x(__r2, __p, __e, __l, 8); \
break; \
default: __e = __put_user_bad(); break; \
} \
__e; \
})
+#define put_user(x,p) \
+ ({ \
+ might_fault(); \
+ __put_user_check(x,p); \
+ })
+
#else /* CONFIG_MMU */
/*
@@ -174,8 +200,8 @@ extern int __put_user_8(void *, unsigned long long);
#define USER_DS KERNEL_DS
#define segment_eq(a,b) (1)
-#define __addr_ok(addr) (1)
-#define __range_ok(addr,size) (0)
+#define __addr_ok(addr) ((void)(addr),1)
+#define __range_ok(addr,size) ((void)(addr),0)
#define get_fs() (KERNEL_DS)
static inline void set_fs(mm_segment_t fs)
@@ -189,6 +215,9 @@ static inline void set_fs(mm_segment_t fs)
#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
+#define user_addr_max() \
+ (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
+
/*
* The "__xxx" versions of the user access functions do not verify the
* address space - it must have been done previously with a separate
@@ -216,6 +245,7 @@ do { \
unsigned long __gu_addr = (unsigned long)(ptr); \
unsigned long __gu_val; \
__chk_user_ptr(ptr); \
+ might_fault(); \
switch (sizeof(*(ptr))) { \
case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
@@ -297,6 +327,7 @@ do { \
unsigned long __pu_addr = (unsigned long)(ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
__chk_user_ptr(ptr); \
+ might_fault(); \
switch (sizeof(*(ptr))) { \
case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
@@ -398,9 +429,6 @@ extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned l
#define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0)
#endif
-extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
-extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
-
static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
@@ -427,24 +455,9 @@ static inline unsigned long __must_check clear_user(void __user *to, unsigned lo
return n;
}
-static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count)
-{
- long res = -EFAULT;
- if (access_ok(VERIFY_READ, src, 1))
- res = __strncpy_from_user(dst, src, count);
- return res;
-}
-
-#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
-
-static inline long __must_check strnlen_user(const char __user *s, long n)
-{
- unsigned long res = 0;
+extern long strncpy_from_user(char *dest, const char __user *src, long count);
- if (__addr_ok(s))
- res = __strnlen_user(s, n);
-
- return res;
-}
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *str, long n);
#endif /* _ASMARM_UACCESS_H */