From: Arnd Bergmann arnd@arndb.de
[ Upstream commit a97b693c3712f040c5802f32b2d685352e08cefa ]
These two architectures implement 8-byte get_user() through a memcpy() into a four-byte variable, which won't fit.
Use a temporary 64-bit variable instead here, and use a double cast the way that risc-v and openrisc do to avoid compile-time warnings.
Fixes: 6a090e97972d ("arch/microblaze: support get_user() of size 8 bytes") Fixes: 5ccc6af5e88e ("nios2: Memory management") Reviewed-by: Christoph Hellwig hch@lst.de Acked-by: Dinh Nguyen dinguyen@kernel.org Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/microblaze/include/asm/uaccess.h | 18 +++++++++--------- arch/nios2/include/asm/uaccess.h | 26 ++++++++++++++++---------- 2 files changed, 25 insertions(+), 19 deletions(-)
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index a1f206b90753..c8cd66c8d257 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -171,27 +171,27 @@ extern long __user_bad(void);
#define __get_user(x, ptr) \ ({ \ - unsigned long __gu_val = 0; \ long __gu_err; \ switch (sizeof(*(ptr))) { \ case 1: \ - __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lbu", (ptr), x, __gu_err); \ break; \ case 2: \ - __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lhu", (ptr), x, __gu_err); \ break; \ case 4: \ - __get_user_asm("lw", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lw", (ptr), x, __gu_err); \ break; \ - case 8: \ - __gu_err = __copy_from_user(&__gu_val, ptr, 8); \ - if (__gu_err) \ - __gu_err = -EFAULT; \ + case 8: { \ + __u64 __x = 0; \ + __gu_err = raw_copy_from_user(&__x, ptr, 8) ? \ + -EFAULT : 0; \ + (x) = (typeof(x))(typeof((x) - (x)))__x; \ break; \ + } \ default: \ /* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\ } \ - x = (__force __typeof__(*(ptr))) __gu_val; \ __gu_err; \ })
diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h index e83f831a76f9..6be5e913c42e 100644 --- a/arch/nios2/include/asm/uaccess.h +++ b/arch/nios2/include/asm/uaccess.h @@ -89,6 +89,7 @@ extern __must_check long strnlen_user(const char __user *s, long n); /* Optimized macros */ #define __get_user_asm(val, insn, addr, err) \ { \ + unsigned long __gu_val; \ __asm__ __volatile__( \ " movi %0, %3\n" \ "1: " insn " %1, 0(%2)\n" \ @@ -97,14 +98,20 @@ extern __must_check long strnlen_user(const char __user *s, long n); " .section __ex_table,"a"\n" \ " .word 1b, 2b\n" \ " .previous" \ - : "=&r" (err), "=r" (val) \ + : "=&r" (err), "=r" (__gu_val) \ : "r" (addr), "i" (-EFAULT)); \ + val = (__force __typeof__(*(addr)))__gu_val; \ }
-#define __get_user_unknown(val, size, ptr, err) do { \ +extern void __get_user_unknown(void); + +#define __get_user_8(val, ptr, err) do { \ + u64 __val = 0; \ err = 0; \ - if (__copy_from_user(&(val), ptr, size)) { \ + if (raw_copy_from_user(&(__val), ptr, sizeof(val))) { \ err = -EFAULT; \ + } else { \ + val = (typeof(val))(typeof((val) - (val)))__val; \ } \ } while (0)
@@ -120,8 +127,11 @@ do { \ case 4: \ __get_user_asm(val, "ldw", ptr, err); \ break; \ + case 8: \ + __get_user_8(val, ptr, err); \ + break; \ default: \ - __get_user_unknown(val, size, ptr, err); \ + __get_user_unknown(); \ break; \ } \ } while (0) @@ -130,9 +140,7 @@ do { \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ - unsigned long __gu_val = 0; \ - __get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\ - (x) = (__force __typeof__(x))__gu_val; \ + __get_user_common(x, sizeof(*(ptr)), __gu_ptr, __gu_err); \ __gu_err; \ })
@@ -140,11 +148,9 @@ do { \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ - unsigned long __gu_val = 0; \ if (access_ok( __gu_ptr, sizeof(*__gu_ptr))) \ - __get_user_common(__gu_val, sizeof(*__gu_ptr), \ + __get_user_common(x, sizeof(*__gu_ptr), \ __gu_ptr, __gu_err); \ - (x) = (__force __typeof__(x))__gu_val; \ __gu_err; \ })