^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef __ASM_GENERIC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define __ASM_GENERIC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * User space memory access functions, these should work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * on any machine that has kernel and user data in the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * address space, e.g. all NOMMU machines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #ifdef CONFIG_UACCESS_MEMCPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static __always_inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) __get_user_fn(size_t size, const void __user *from, void *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) BUILD_BUG_ON(!__builtin_constant_p(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) switch (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *(u8 *)to = get_unaligned((u8 __force *)from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *(u16 *)to = get_unaligned((u16 __force *)from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *(u32 *)to = get_unaligned((u32 __force *)from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *(u64 *)to = get_unaligned((u64 __force *)from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) BUILD_BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static __always_inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) __put_user_fn(size_t size, void __user *to, void *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) BUILD_BUG_ON(!__builtin_constant_p(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) switch (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) put_unaligned(*(u8 *)from, (u8 __force *)to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) put_unaligned(*(u16 *)from, (u16 __force *)to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) put_unaligned(*(u32 *)from, (u32 __force *)to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) put_unaligned(*(u64 *)from, (u64 __force *)to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) BUILD_BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define __get_kernel_nofault(dst, src, type, err_label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *((type *)dst) = get_unaligned((type *)(src)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (0) /* make sure the label looks used to the compiler */ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto err_label; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define __put_kernel_nofault(dst, src, type, err_label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) put_unaligned(*((type *)src), (type *)(dst)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (0) /* make sure the label looks used to the compiler */ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) goto err_label; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #define HAVE_GET_KERNEL_NOFAULT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static inline __must_check unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) raw_copy_from_user(void *to, const void __user * from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) memcpy(to, (const void __force *)from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static inline __must_check unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) raw_copy_to_user(void __user *to, const void *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) memcpy((void __force *)to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #define INLINE_COPY_FROM_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define INLINE_COPY_TO_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #endif /* CONFIG_UACCESS_MEMCPY */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #ifdef CONFIG_SET_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #ifndef KERNEL_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define KERNEL_DS MAKE_MM_SEG(~0UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #ifndef USER_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #ifndef get_fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #define get_fs() (current_thread_info()->addr_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static inline void set_fs(mm_segment_t fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) current_thread_info()->addr_limit = fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #ifndef uaccess_kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif /* CONFIG_SET_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) #define access_ok(addr, size) __access_ok((unsigned long)(addr),(size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * The architecture should really override this if possible, at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * doing a check on the get_fs()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #ifndef __access_ok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static inline int __access_ok(unsigned long addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * These are the main single-value transfer routines. They automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * use the right size if we just have the right pointer type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * This version just falls back to copy_{from,to}_user, which should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * provide a fast-path for small values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #define __put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) __typeof__(*(ptr)) __x = (x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int __pu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) __chk_user_ptr(ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) switch (sizeof (*(ptr))) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) case 1: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) case 2: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) case 4: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) case 8: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) __pu_err = __put_user_fn(sizeof (*(ptr)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) ptr, &__x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) default: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) __put_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) #define put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) void __user *__p = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) access_ok(__p, sizeof(*ptr)) ? \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) __put_user((x), ((__typeof__(*(ptr)) __user *)__p)) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #ifndef __put_user_fn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return unlikely(raw_copy_to_user(ptr, x, size)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) #define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) extern int __put_user_bad(void) __attribute__((noreturn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) #define __get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int __gu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) __chk_user_ptr(ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) switch (sizeof(*(ptr))) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case 1: { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) unsigned char __x = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) __gu_err = __get_user_fn(sizeof (*(ptr)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ptr, &__x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) (x) = *(__force __typeof__(*(ptr)) *) &__x; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) case 2: { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) unsigned short __x = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) __gu_err = __get_user_fn(sizeof (*(ptr)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) ptr, &__x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) (x) = *(__force __typeof__(*(ptr)) *) &__x; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) case 4: { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) unsigned int __x = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) __gu_err = __get_user_fn(sizeof (*(ptr)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) ptr, &__x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) (x) = *(__force __typeof__(*(ptr)) *) &__x; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) case 8: { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) unsigned long long __x = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) __gu_err = __get_user_fn(sizeof (*(ptr)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) ptr, &__x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) (x) = *(__force __typeof__(*(ptr)) *) &__x; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) default: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) __get_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) #define get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) const void __user *__p = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) access_ok(__p, sizeof(*ptr)) ? \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) __get_user((x), (__typeof__(*(ptr)) __user *)__p) :\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) ((x) = (__typeof__(*(ptr)))0,-EFAULT); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) #ifndef __get_user_fn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return unlikely(raw_copy_from_user(x, ptr, size)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) #define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) extern int __get_user_bad(void) __attribute__((noreturn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * Copy a null terminated string from userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) #ifndef __strncpy_from_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static inline long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) __strncpy_from_user(char *dst, const char __user *src, long count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) char *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) strncpy(dst, (const char __force *)src, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) for (tmp = dst; *tmp && count > 0; tmp++, count--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return (tmp - dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static inline long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) strncpy_from_user(char *dst, const char __user *src, long count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (!access_ok(src, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return __strncpy_from_user(dst, src, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * Return the size of a string (including the ending 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * Return 0 on exception, a value greater than N if too long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) #ifndef __strnlen_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) #define __strnlen_user(s, n) (strnlen((s), (n)) + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * Unlike strnlen, strnlen_user includes the nul terminator in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * its returned count. Callers should check for a returned value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * greater than N as an indication the string is too long.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static inline long strnlen_user(const char __user *src, long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (!access_ok(src, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return __strnlen_user(src, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * Zero Userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #ifndef __clear_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static inline __must_check unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) __clear_user(void __user *to, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) memset((void __force *)to, 0, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) static inline __must_check unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) clear_user(void __user *to, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) might_fault();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (!access_ok(to, n))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return __clear_user(to, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) #include <asm/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #endif /* __ASM_GENERIC_UACCESS_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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