diff options
Diffstat (limited to 'arch/x86/lib/getuser.S')
-rw-r--r-- | arch/x86/lib/getuser.S | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S index a314622aa093..4357ec2a0bfc 100644 --- a/arch/x86/lib/getuser.S +++ b/arch/x86/lib/getuser.S @@ -39,8 +39,13 @@ .macro check_range size:req .if IS_ENABLED(CONFIG_X86_64) - mov %rax, %rdx - sar $63, %rdx + movq $0x0123456789abcdef,%rdx + 1: + .pushsection runtime_ptr_USER_PTR_MAX,"a" + .long 1b - 8 - . + .popsection + cmp %rax, %rdx + sbb %rdx, %rdx or %rdx, %rax .else cmp $TASK_SIZE_MAX-\size+1, %eax @@ -88,12 +93,14 @@ SYM_FUNC_END(__get_user_4) EXPORT_SYMBOL(__get_user_4) SYM_FUNC_START(__get_user_8) +#ifndef CONFIG_X86_64 + xor %ecx,%ecx +#endif check_range size=8 ASM_STAC #ifdef CONFIG_X86_64 UACCESS movq (%_ASM_AX),%rdx #else - xor %ecx,%ecx UACCESS movl (%_ASM_AX),%edx UACCESS movl 4(%_ASM_AX),%ecx #endif |