From: Mark Rutland mark.rutland@arm.com
mainline inclusion from mainline-v5.11-rc1 commit f253d827f33cb5a5990b5cfd271941d1a21ecd85 category: performance bugzilla: https://e.gitee.com/open_euler/issues/list?issue=I4SCW7 CVE: NA
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As a step towards implementing __{get,put}_kernel_nofault(), this patch splits most user-memory specific logic out of __{get,put}_user(), with the memory access and fault handling in new __{raw_get,put}_mem() helpers.
For now the LDR/LDTR patching is left within the *get_mem() helpers, and will be removed in a subsequent patch.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland mark.rutland@arm.com Cc: Christoph Hellwig hch@lst.de Cc: James Morse james.morse@arm.com Cc: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20201202131558.39270-7-mark.rutland@arm.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Zhen Lei thunder.leizhen@huawei.com Reviewed-by: Hanjun Guo guohanjun@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- arch/arm64/include/asm/uaccess.h | 44 ++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 17 deletions(-)
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index e2e60f39dfaa..5792fbcebfc7 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -253,7 +253,7 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr) * The "__xxx_error" versions set the third argument to -EFAULT if an error * occurs, and leave it unchanged on success. */ -#define __get_user_asm(instr, alt_instr, reg, x, addr, err, feature) \ +#define __get_mem_asm(instr, alt_instr, reg, x, addr, err, feature) \ asm volatile( \ "1:"ALTERNATIVE(instr " " reg "1, [%2]\n", \ alt_instr " " reg "1, [%2]\n", feature) \ @@ -268,35 +268,40 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr) : "+r" (err), "=&r" (x) \ : "r" (addr), "i" (-EFAULT))
-#define __raw_get_user(x, ptr, err) \ +#define __raw_get_mem(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_mem_asm("ldrb", "ldtrb", "%w", __gu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 2: \ - __get_user_asm("ldrh", "ldtrh", "%w", __gu_val, (ptr), \ + __get_mem_asm("ldrh", "ldtrh", "%w", __gu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 4: \ - __get_user_asm("ldr", "ldtr", "%w", __gu_val, (ptr), \ + __get_mem_asm("ldr", "ldtr", "%w", __gu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 8: \ - __get_user_asm("ldr", "ldtr", "%x", __gu_val, (ptr), \ + __get_mem_asm("ldr", "ldtr", "%x", __gu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ default: \ BUILD_BUG(); \ } \ - uaccess_disable_not_uao(); \ (x) = (__force __typeof__(*(ptr)))__gu_val; \ } while (0)
+#define __raw_get_user(x, ptr, err) \ +do { \ + __chk_user_ptr(ptr); \ + uaccess_enable_not_uao(); \ + __raw_get_mem(x, ptr, err); \ + uaccess_disable_not_uao(); \ +} while (0) + #define __get_user_error(x, ptr, err) \ do { \ __typeof__(*(ptr)) __user *__p = (ptr); \ @@ -318,7 +323,7 @@ do { \
#define get_user __get_user
-#define __put_user_asm(instr, alt_instr, reg, x, addr, err, feature) \ +#define __put_mem_asm(instr, alt_instr, reg, x, addr, err, feature) \ asm volatile( \ "1:"ALTERNATIVE(instr " " reg "1, [%2]\n", \ alt_instr " " reg "1, [%2]\n", feature) \ @@ -332,31 +337,36 @@ do { \ : "+r" (err) \ : "r" (x), "r" (addr), "i" (-EFAULT))
-#define __raw_put_user(x, ptr, err) \ +#define __raw_put_mem(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_mem_asm("strb", "sttrb", "%w", __pu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 2: \ - __put_user_asm("strh", "sttrh", "%w", __pu_val, (ptr), \ + __put_mem_asm("strh", "sttrh", "%w", __pu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 4: \ - __put_user_asm("str", "sttr", "%w", __pu_val, (ptr), \ + __put_mem_asm("str", "sttr", "%w", __pu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ case 8: \ - __put_user_asm("str", "sttr", "%x", __pu_val, (ptr), \ + __put_mem_asm("str", "sttr", "%x", __pu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ default: \ BUILD_BUG(); \ } \ +} while (0) + +#define __raw_put_user(x, ptr, err) \ +do { \ + __chk_user_ptr(ptr); \ + uaccess_enable_not_uao(); \ + __raw_put_mem(x, ptr, err); \ uaccess_disable_not_uao(); \ } while (0)