diff options
Diffstat (limited to 'arch/x86/include/asm/uaccess_64.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess_64.h | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index f2c02e4469cc..04789f45ab2b 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -11,6 +11,7 @@ #include <asm/alternative.h> #include <asm/cpufeatures.h> #include <asm/page.h> +#include <asm/percpu.h> #ifdef CONFIG_ADDRESS_MASKING /* @@ -18,14 +19,10 @@ */ static inline unsigned long __untagged_addr(unsigned long addr) { - /* - * Refer tlbstate_untag_mask directly to avoid RIP-relative relocation - * in alternative instructions. The relocation gets wrong when gets - * copied to the target place. - */ asm (ALTERNATIVE("", - "and %%gs:tlbstate_untag_mask, %[addr]\n\t", X86_FEATURE_LAM) - : [addr] "+r" (addr) : "m" (tlbstate_untag_mask)); + "and " __percpu_arg([mask]) ", %[addr]", X86_FEATURE_LAM) + : [addr] "+r" (addr) + : [mask] "m" (__my_cpu_var(tlbstate_untag_mask))); return addr; } @@ -54,7 +51,7 @@ static inline unsigned long __untagged_addr_remote(struct mm_struct *mm, * half and a user half. When cast to a signed type, user pointers * are positive and kernel pointers are negative. */ -#define valid_user_address(x) ((long)(x) >= 0) +#define valid_user_address(x) ((__force long)(x) >= 0) /* * User pointers can have tag bits on x86-64. This scheme tolerates @@ -87,8 +84,9 @@ static inline bool __access_ok(const void __user *ptr, unsigned long size) if (__builtin_constant_p(size <= PAGE_SIZE) && size <= PAGE_SIZE) { return valid_user_address(ptr); } else { - unsigned long sum = size + (unsigned long)ptr; - return valid_user_address(sum) && sum >= (unsigned long)ptr; + unsigned long sum = size + (__force unsigned long)ptr; + + return valid_user_address(sum) && sum >= (__force unsigned long)ptr; } } #define __access_ok __access_ok |