mirror of https://gitee.com/openkylin/linux.git
arm64: uaccess: Implement unsafe accessors
Current implementation of get/put_user_unsafe default to get/put_user which toggle PAN before each access, despite having been told by the caller that multiple accesses to user memory were about to happen. Provide implementations for user_access_begin/end to turn PAN off/on and implement unsafe accessors that assume PAN was already turned off. Signed-off-by: Julien Thierry <julien.thierry@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Julien Thierry
Catalin Marinas
parent
13e4cdd785
commit
0bd3ef34d2
|
|
@ -270,31 +270,26 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr)
|
|||
|
||||
#define __raw_get_user(x, ptr, err) \
|
||||
do { \
|
||||
unsigned long __gu_val; \
|
||||
__chk_user_ptr(ptr); \
|
||||
uaccess_enable_not_uao(); \
|
||||
switch (sizeof(*(ptr))) { \
|
||||
case 1: \
|
||||
__get_user_asm("ldrb", "ldtrb", "%w", __gu_val, (ptr), \
|
||||
__get_user_asm("ldrb", "ldtrb", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 2: \
|
||||
__get_user_asm("ldrh", "ldtrh", "%w", __gu_val, (ptr), \
|
||||
__get_user_asm("ldrh", "ldtrh", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 4: \
|
||||
__get_user_asm("ldr", "ldtr", "%w", __gu_val, (ptr), \
|
||||
__get_user_asm("ldr", "ldtr", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 8: \
|
||||
__get_user_asm("ldr", "ldtr", "%x", __gu_val, (ptr), \
|
||||
__get_user_asm("ldr", "ldtr", "%x", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
default: \
|
||||
BUILD_BUG(); \
|
||||
} \
|
||||
uaccess_disable_not_uao(); \
|
||||
(x) = (__force __typeof__(*(ptr)))__gu_val; \
|
||||
} while (0)
|
||||
|
||||
#define __get_user_error(x, ptr, err) \
|
||||
|
|
@ -302,8 +297,13 @@ do { \
|
|||
__typeof__(*(ptr)) __user *__p = (ptr); \
|
||||
might_fault(); \
|
||||
if (access_ok(__p, sizeof(*__p))) { \
|
||||
unsigned long __gu_val; \
|
||||
__chk_user_ptr(__p); \
|
||||
__p = uaccess_mask_ptr(__p); \
|
||||
__raw_get_user((x), __p, (err)); \
|
||||
uaccess_enable_not_uao(); \
|
||||
__raw_get_user(__gu_val, __p, (err)); \
|
||||
uaccess_disable_not_uao(); \
|
||||
(x) = (__force __typeof__(*__p)) __gu_val; \
|
||||
} else { \
|
||||
(x) = 0; (err) = -EFAULT; \
|
||||
} \
|
||||
|
|
@ -334,30 +334,26 @@ do { \
|
|||
|
||||
#define __raw_put_user(x, ptr, err) \
|
||||
do { \
|
||||
__typeof__(*(ptr)) __pu_val = (x); \
|
||||
__chk_user_ptr(ptr); \
|
||||
uaccess_enable_not_uao(); \
|
||||
switch (sizeof(*(ptr))) { \
|
||||
case 1: \
|
||||
__put_user_asm("strb", "sttrb", "%w", __pu_val, (ptr), \
|
||||
__put_user_asm("strb", "sttrb", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 2: \
|
||||
__put_user_asm("strh", "sttrh", "%w", __pu_val, (ptr), \
|
||||
__put_user_asm("strh", "sttrh", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 4: \
|
||||
__put_user_asm("str", "sttr", "%w", __pu_val, (ptr), \
|
||||
__put_user_asm("str", "sttr", "%w", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
case 8: \
|
||||
__put_user_asm("str", "sttr", "%x", __pu_val, (ptr), \
|
||||
__put_user_asm("str", "sttr", "%x", (x), (ptr), \
|
||||
(err), ARM64_HAS_UAO); \
|
||||
break; \
|
||||
default: \
|
||||
BUILD_BUG(); \
|
||||
} \
|
||||
uaccess_disable_not_uao(); \
|
||||
} while (0)
|
||||
|
||||
#define __put_user_error(x, ptr, err) \
|
||||
|
|
@ -365,9 +361,13 @@ do { \
|
|||
__typeof__(*(ptr)) __user *__p = (ptr); \
|
||||
might_fault(); \
|
||||
if (access_ok(__p, sizeof(*__p))) { \
|
||||
__typeof__(*(ptr)) __pu_val = (x); \
|
||||
__chk_user_ptr(__p); \
|
||||
__p = uaccess_mask_ptr(__p); \
|
||||
__raw_put_user((x), __p, (err)); \
|
||||
} else { \
|
||||
uaccess_enable_not_uao(); \
|
||||
__raw_put_user(__pu_val, __p, (err)); \
|
||||
uaccess_disable_not_uao(); \
|
||||
} else { \
|
||||
(err) = -EFAULT; \
|
||||
} \
|
||||
} while (0)
|
||||
|
|
@ -381,6 +381,45 @@ do { \
|
|||
|
||||
#define put_user __put_user
|
||||
|
||||
static __must_check inline bool user_access_begin(const void __user *ptr,
|
||||
size_t len)
|
||||
{
|
||||
if (unlikely(!access_ok(ptr, len)))
|
||||
return false;
|
||||
|
||||
uaccess_enable_not_uao();
|
||||
return true;
|
||||
}
|
||||
#define user_access_begin(ptr, len) user_access_begin(ptr, len)
|
||||
#define user_access_end() uaccess_disable_not_uao()
|
||||
|
||||
#define unsafe_get_user(x, ptr, err) \
|
||||
do { \
|
||||
__typeof__(*(ptr)) __user *__p = (ptr); \
|
||||
unsigned long __gu_val; \
|
||||
int __gu_err = 0; \
|
||||
might_fault(); \
|
||||
__chk_user_ptr(__p); \
|
||||
__p = uaccess_mask_ptr(__p); \
|
||||
__raw_get_user(__gu_val, __p, __gu_err); \
|
||||
(x) = (__force __typeof__(*__p)) __gu_val; \
|
||||
if (__gu_err != 0) \
|
||||
goto err; \
|
||||
} while (0)
|
||||
|
||||
#define unsafe_put_user(x, ptr, err) \
|
||||
do { \
|
||||
__typeof__(*(ptr)) __user *__p = (ptr); \
|
||||
__typeof__(*(ptr)) __pu_val = (x); \
|
||||
int __pu_err = 0; \
|
||||
might_fault(); \
|
||||
__chk_user_ptr(__p); \
|
||||
__p = uaccess_mask_ptr(__p); \
|
||||
__raw_put_user(__pu_val, __p, __pu_err); \
|
||||
if (__pu_err != 0) \
|
||||
goto err; \
|
||||
} while (0)
|
||||
|
||||
extern unsigned long __must_check __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
|
||||
#define raw_copy_from_user(to, from, n) \
|
||||
({ \
|
||||
|
|
|
|||
Loading…
Reference in New Issue