diff options
Diffstat (limited to 'arch/x86/include/asm/uaccess.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 81 |
1 files changed, 18 insertions, 63 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index ea148313570f..a059aac9e937 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -3,19 +3,14 @@ /* * User space memory access functions */ -#include <linux/errno.h> #include <linux/compiler.h> #include <linux/kasan-checks.h> -#include <linux/thread_info.h> #include <linux/string.h> #include <asm/asm.h> #include <asm/page.h> #include <asm/smap.h> #include <asm/extable.h> -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - /* * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with @@ -324,10 +319,10 @@ do { \ #define __get_user_asm_u64(x, ptr, retval, errret) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ - asm volatile(ASM_STAC "\n" \ + asm volatile("\n" \ "1: movl %2,%%eax\n" \ "2: movl %3,%%edx\n" \ - "3: " ASM_CLAC "\n" \ + "3:\n" \ ".section .fixup,\"ax\"\n" \ "4: mov %4,%0\n" \ " xorl %%eax,%%eax\n" \ @@ -336,7 +331,7 @@ do { \ ".previous\n" \ _ASM_EXTABLE(1b, 4b) \ _ASM_EXTABLE(2b, 4b) \ - : "=r" (retval), "=A"(x) \ + : "=r" (retval), "=&A"(x) \ : "m" (__m(__ptr)), "m" __m(((u32 *)(__ptr)) + 1), \ "i" (errret), "0" (retval)); \ }) @@ -384,6 +379,18 @@ do { \ : "=r" (err), ltype(x) \ : "m" (__m(addr)), "i" (errret), "0" (err)) +#define __get_user_asm_nozero(x, addr, err, itype, rtype, ltype, errret) \ + asm volatile("\n" \ + "1: mov"itype" %2,%"rtype"1\n" \ + "2:\n" \ + ".section .fixup,\"ax\"\n" \ + "3: mov %3,%0\n" \ + " jmp 2b\n" \ + ".previous\n" \ + _ASM_EXTABLE(1b, 3b) \ + : "=r" (err), ltype(x) \ + : "m" (__m(addr)), "i" (errret), "0" (err)) + /* * This doesn't do __uaccess_begin/end - the exception handling * around it must do that. @@ -675,59 +682,6 @@ extern struct movsl_mask { # include <asm/uaccess_64.h> #endif -unsigned long __must_check _copy_from_user(void *to, const void __user *from, - unsigned n); -unsigned long __must_check _copy_to_user(void __user *to, const void *from, - unsigned n); - -extern void __compiletime_error("usercopy buffer size is too small") -__bad_copy_user(void); - -static inline void copy_user_overflow(int size, unsigned long count) -{ - WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); -} - -static __always_inline unsigned long __must_check -copy_from_user(void *to, const void __user *from, unsigned long n) -{ - int sz = __compiletime_object_size(to); - - might_fault(); - - kasan_check_write(to, n); - - if (likely(sz < 0 || sz >= n)) { - check_object_size(to, n, false); - n = _copy_from_user(to, from, n); - } else if (!__builtin_constant_p(n)) - copy_user_overflow(sz, n); - else - __bad_copy_user(); - - return n; -} - -static __always_inline unsigned long __must_check -copy_to_user(void __user *to, const void *from, unsigned long n) -{ - int sz = __compiletime_object_size(from); - - kasan_check_read(from, n); - - might_fault(); - - if (likely(sz < 0 || sz >= n)) { - check_object_size(from, n, true); - n = _copy_to_user(to, from, n); - } else if (!__builtin_constant_p(n)) - copy_user_overflow(sz, n); - else - __bad_copy_user(); - - return n; -} - /* * We rely on the nested NMI work to allow atomic faults from the NMI path; the * nested NMI paths are careful to preserve CR2. @@ -749,14 +703,15 @@ copy_to_user(void __user *to, const void *from, unsigned long n) #define unsafe_put_user(x, ptr, err_label) \ do { \ int __pu_err; \ - __put_user_size((x), (ptr), sizeof(*(ptr)), __pu_err, -EFAULT); \ + __typeof__(*(ptr)) __pu_val = (x); \ + __put_user_size(__pu_val, (ptr), sizeof(*(ptr)), __pu_err, -EFAULT); \ if (unlikely(__pu_err)) goto err_label; \ } while (0) #define unsafe_get_user(x, ptr, err_label) \ do { \ int __gu_err; \ - unsigned long __gu_val; \ + __inttype(*(ptr)) __gu_val; \ __get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err, -EFAULT); \ (x) = (__force __typeof__(*(ptr)))__gu_val; \ if (unlikely(__gu_err)) goto err_label; \ |