diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 19 | ||||
| -rw-r--r-- | arch/x86/kernel/i386_ksyms_32.c | 1 | ||||
| -rw-r--r-- | arch/x86/lib/getuser.S | 37 |
3 files changed, 48 insertions, 9 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 1709801d18ec..1e963267d44e 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -151,8 +151,15 @@ extern int __get_user_bad(void); * On error, the variable @x is set to zero. */ #ifdef CONFIG_X86_32 -#define __get_user_8(__ret_gu, __val_gu, ptr) \ - __get_user_x(X, __ret_gu, __val_gu, ptr) +#define __get_user_8(ret, x, ptr) \ +do { \ + register unsigned long long __xx asm("%edx"); \ + asm volatile("call __get_user_8" \ + : "=a" (ret), "=r" (__xx) \ + : "0" (ptr)); \ + (x) = __xx; \ +} while (0) + #else #define __get_user_8(__ret_gu, __val_gu, ptr) \ __get_user_x(8, __ret_gu, __val_gu, ptr) @@ -162,6 +169,7 @@ extern int __get_user_bad(void); ({ \ int __ret_gu; \ unsigned long __val_gu; \ + unsigned long long __val_gu8; \ __chk_user_ptr(ptr); \ might_fault(); \ switch (sizeof(*(ptr))) { \ @@ -175,13 +183,16 @@ extern int __get_user_bad(void); __get_user_x(4, __ret_gu, __val_gu, ptr); \ break; \ case 8: \ - __get_user_8(__ret_gu, __val_gu, ptr); \ + __get_user_8(__ret_gu, __val_gu8, ptr); \ break; \ default: \ __get_user_x(X, __ret_gu, __val_gu, ptr); \ break; \ } \ - (x) = (__typeof__(*(ptr)))__val_gu; \ + if (sizeof(*(ptr)) == 8) \ + (x) = (__typeof__(*(ptr)))__val_gu8; \ + else \ + (x) = (__typeof__(*(ptr)))__val_gu; \ __ret_gu; \ }) diff --git a/arch/x86/kernel/i386_ksyms_32.c b/arch/x86/kernel/i386_ksyms_32.c index 9c3bd4a2050e..0fa69127209a 100644 --- a/arch/x86/kernel/i386_ksyms_32.c +++ b/arch/x86/kernel/i386_ksyms_32.c @@ -26,6 +26,7 @@ EXPORT_SYMBOL(csum_partial_copy_generic); EXPORT_SYMBOL(__get_user_1); EXPORT_SYMBOL(__get_user_2); EXPORT_SYMBOL(__get_user_4); +EXPORT_SYMBOL(__get_user_8); EXPORT_SYMBOL(__put_user_1); EXPORT_SYMBOL(__put_user_2); diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S index 156b9c804670..d3bf9f99ca77 100644 --- a/arch/x86/lib/getuser.S +++ b/arch/x86/lib/getuser.S @@ -15,11 +15,10 @@ * __get_user_X * * Inputs: %[r|e]ax contains the address. - * The register is modified, but all changes are undone - * before returning because the C code doesn't know about it. * * Outputs: %[r|e]ax is error code (0 or -EFAULT) * %[r|e]dx contains zero-extended value + * %ecx contains the high half for 32-bit __get_user_8 * * * These functions should not modify any other registers, @@ -79,22 +78,35 @@ ENTRY(__get_user_4) CFI_ENDPROC ENDPROC(__get_user_4) -#ifdef CONFIG_X86_64 ENTRY(__get_user_8) CFI_STARTPROC +#ifdef CONFIG_X86_64 add $7,%_ASM_AX jc bad_get_user GET_THREAD_INFO(%_ASM_DX) cmp TI_addr_limit(%_ASM_DX),%_ASM_AX - jae bad_get_user + jae bad_get_user ASM_STAC 4: movq -7(%_ASM_AX),%_ASM_DX xor %eax,%eax ASM_CLAC ret +#else + add $7,%_ASM_AX + jc bad_get_user_8 + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX + jae bad_get_user_8 + ASM_STAC +4: mov -7(%_ASM_AX),%edx +5: mov -3(%_ASM_AX),%ecx + xor %eax,%eax + ASM_CLAC + ret +#endif CFI_ENDPROC ENDPROC(__get_user_8) -#endif + bad_get_user: CFI_STARTPROC @@ -105,9 +117,24 @@ bad_get_user: CFI_ENDPROC END(bad_get_user) +#ifdef CONFIG_X86_32 +bad_get_user_8: + CFI_STARTPROC + xor %edx,%edx + xor %ecx,%ecx + mov $(-EFAULT),%_ASM_AX + ASM_CLAC + ret + CFI_ENDPROC +END(bad_get_user_8) +#endif + _ASM_EXTABLE(1b,bad_get_user) _ASM_EXTABLE(2b,bad_get_user) _ASM_EXTABLE(3b,bad_get_user) #ifdef CONFIG_X86_64 _ASM_EXTABLE(4b,bad_get_user) +#else + _ASM_EXTABLE(4b,bad_get_user_8) + _ASM_EXTABLE(5b,bad_get_user_8) #endif |