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| 1 | /* | |||
| 2 | * User address space access functions. | |||
| 3 | * | |||
| 4 | * Copyright 1997 Andi Kleen <ak@muc.de> | |||
| 5 | * Copyright 1997 Linus Torvalds | |||
| 6 | * Copyright 2002 Andi Kleen <ak@suse.de> | |||
| 7 | */ | |||
| 8 | #include <asm/uaccess.h> | |||
| 9 | ||||
| 10 | /* | |||
| 11 | * Copy a null terminated string from userspace. | |||
| 12 | */ | |||
| 13 | ||||
| 14 | #define __do_strncpy_from_user(dst,src,count,res) \ | |||
| 15 | do { \ | |||
| 16 | long __d0, __d1, __d2; \ | |||
| 17 | might_sleep(); \ | |||
| 18 | __asm__ __volatile__( \ | |||
| 19 | " testq %1,%1\n" \ | |||
| 20 | " jz 2f\n" \ | |||
| 21 | "0: lodsb\n" \ | |||
| 22 | " stosb\n" \ | |||
| 23 | " testb %%al,%%al\n" \ | |||
| 24 | " jz 1f\n" \ | |||
| 25 | " decq %1\n" \ | |||
| 26 | " jnz 0b\n" \ | |||
| 27 | "1: subq %1,%0\n" \ | |||
| 28 | "2:\n" \ | |||
| 29 | ".section .fixup,\"ax\"\n" \ | |||
| 30 | "3: movq %5,%0\n" \ | |||
| 31 | " jmp 2b\n" \ | |||
| 32 | ".previous\n" \ | |||
| 33 | ".section __ex_table,\"a\"\n" \ | |||
| 34 | " .align 8\n" \ | |||
| 35 | " .quad 0b,3b\n" \ | |||
| 36 | ".previous" \ | |||
| 37 | : "=r"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \ | |||
| 38 | "=&D" (__d2) \ | |||
| 39 | : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \ | |||
| 40 | : "memory"); \ | |||
| 41 | } while (0) | |||
| 42 | ||||
| 43 | long | |||
| 0 | 0 | - | 44 | __strncpy_from_user(char *dst, const char __user *src, long count) |
| 45 | { | |||
| 46 | long res; | |||
| 47 | __do_strncpy_from_user(dst, src, count, res); | |||
| 47 | do | |||
| 47 | do | |||
| 0 | 0 | - | 47 | do-while (0) |
| 0 | 0 | - | 47 | do-while (0) |
| 0 | 0 | - | 47 | do-while (0) |
| 0 | - | 48 | return res; | |
| 49 | } | |||
| 50 | ||||
| 51 | long | |||
| 2828E4 | 0 | 52 | strncpy_from_user(char *dst, const char __user *src, long count) | |
| 53 | { | |||
| 54 | long res = -EFAULT; | |||
| 2828E4 | 0 | - | 55 | if (access_ok(VERIFY_READ, src, 1)) |
| 56 | __do_strncpy_from_user(dst, src, count, res); | |||
| 56 | do | |||
| 56 | do | |||
| 0 | 2828E4 | - | 56 | do-while (0) |
| 0 | 2828E4 | - | 56 | do-while (0) |
| 0 | 2828E4 | - | 56 | do-while (0) |
| 2828E4 | 57 | return res; | ||
| 58 | } | |||
| 59 | ||||
| 60 | /* | |||
| 61 | * Zero Userspace | |||
| 62 | */ | |||
| 63 | ||||
| 328985 | 0 | 64 | unsigned long __clear_user(void __user *addr, unsigned long size) | |
| 65 | { | |||
| 66 | long __d0; | |||
| 67 | might_sleep(); | |||
| 67 | do | |||
| 0 | 328985 | - | 67 | do-while (0) |
| 0 | 328985 | - | 67 | do-while (0) |
| 68 | /* no memory constraint because it doesn't change any memory gcc knows | |||
| 69 | about */ | |||
| 70 | asm volatile( | |||
| 71 | " testq %[size8],%[size8]\n" | |||
| 72 | " jz 4f\n" | |||
| 73 | "0: movq %[zero],(%[dst])\n" | |||
| 74 | " addq %[eight],%[dst]\n" | |||
| 75 | " decl %%ecx ; jnz 0b\n" | |||
| 76 | "4: movq %[size1],%%rcx\n" | |||
| 77 | " testl %%ecx,%%ecx\n" | |||
| 78 | " jz 2f\n" | |||
| 79 | "1: movb %b[zero],(%[dst])\n" | |||
| 80 | " incq %[dst]\n" | |||
| 81 | " decl %%ecx ; jnz 1b\n" | |||
| 82 | "2:\n" | |||
| 83 | ".section .fixup,\"ax\"\n" | |||
| 84 | "3: lea 0(%[size1],%[size8],8),%[size8]\n" | |||
| 85 | " jmp 2b\n" | |||
| 86 | ".previous\n" | |||
| 87 | ".section __ex_table,\"a\"\n" | |||
| 88 | " .align 8\n" | |||
| 89 | " .quad 0b,3b\n" | |||
| 90 | " .quad 1b,2b\n" | |||
| 91 | ".previous" | |||
| 92 | : [size8] "=c"(size), [dst] "=&D" (__d0) | |||
| 93 | : [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr), | |||
| 94 | [zero] "r" (0UL), [eight] "r" (8UL)); | |||
| 328985 | 95 | return size; | ||
| 96 | } | |||
| 97 | ||||
| 98 | ||||
| 328985 | 0 | 99 | unsigned long clear_user(void __user *to, unsigned long n) | |
| 100 | { | |||
| 328985 | 0 | - | 101 | if (access_ok(VERIFY_WRITE, to, n)) |
| 328985 | 102 | return __clear_user(to, n); | ||
| 0 | - | 103 | return n; | |
| 104 | } | |||
| 105 | ||||
| 106 | /* | |||
| 107 | * Return the size of a string (including the ending 0) | |||
| 108 | * | |||
| 109 | * Return 0 on exception, a value greater than N if too long | |||
| 110 | */ | |||
| 111 | ||||
| 1061E4 | 0 | 112 | long __strnlen_user(const char __user *s, long n) | |
| 113 | { | |||
| 114 | long res = 0; | |||
| 115 | char c; | |||
| 116 | ||||
| 4906E5 | 0 | - | 117 | while (1) { |
| 1 | 4906E5 | 118 | if (res>n) | |
| 1 | 119 | return n+1; | ||
| 0 | 4906E5 | - | 120 | if (__get_user(c, s)) |
| 0 | - | 121 | return 0; | |
| 1061E4 | 4800E5 | 122 | if (!c) | |
| 1061E4 | 123 | return res+1; | ||
| 124 | res++; | |||
| 125 | s++; | |||
| 126 | } | |||
| 127 | } | |||
| 128 | ||||
| 1061E4 | 0 | 129 | long strnlen_user(const char __user *s, long n) | |
| 130 | { | |||
| 0 | 1061E4 | - | 131 | if (!access_ok(VERIFY_READ, s, n)) |
| 0 | - | 132 | return 0; | |
| 1061E4 | 133 | return __strnlen_user(s, n); | ||
| 134 | } | |||
| 135 | ||||
| 146 | 0 | 136 | long strlen_user(const char __user *s) | |
| 137 | { | |||
| 138 | long res = 0; | |||
| 139 | char c; | |||
| 140 | ||||
| 224 | 0 | - | 141 | for (;;) { |
| 0 | 224 | - | 142 | if (get_user(c, s)) |
| 0 | - | 143 | return 0; | |
| 146 | 78 | 144 | if (!c) | |
| 146 | 145 | return res+1; | ||
| 146 | res++; | |||
| 147 | s++; | |||
| 148 | } | |||
| 149 | } | |||
| 150 | ||||
| 633 | 0 | 151 | unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len) | |
| 152 | { | |||
| 633 | 0 | - | 153 | if (access_ok(VERIFY_WRITE, to, len) && access_ok(VERIFY_READ, from, len)) { |
| 633 | 153 | (T) && (T) | ||
| 0 | - | 153 | (T) && (F) | |
| 0 | - | 153 | (F) && (_) | |
| 633 | 154 | return copy_user_generic((__force void *)to, (__force void *)from, len); | ||
| 155 | } | |||
| 0 | - | 156 | return len; | |
| 157 | } | |||
| ***TER 56% (35/63) of SOURCE FILE usercopy.c | ||||