osfmk/libsa/string.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * NOTICE: This file was modified by McAfee Research in 2004 to introduce
  30  * support for mandatory and extensible security protections.  This notice
  31  * is included in support of clause 2.2 (b) of the Apple Public License,
  32  * Version 2.0.
  33  */
  34 /*
  35  * HISTORY
  36  * @OSF_COPYRIGHT@
  37  */
  38 #ifndef _STRING_H_
  39 #define _STRING_H_      1
  40
  41 #ifdef MACH_KERNEL_PRIVATE
  42 #include <types.h>
  43 #else
  44 #include <sys/types.h>
  45 #endif
  46
  47 #if defined(KERNEL)
  48 #include <sys/cdefs.h>
  49 #endif
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55 #ifndef NULL
  56 #if defined (__cplusplus)
  57 #if __cplusplus >= 201103L
  58 #define NULL nullptr
  59 #else
  60 #define NULL 0
  61 #endif
  62 #else
  63 #define NULL ((void *)0)
  64 #endif
  65 #endif
  66
  67 extern void     *memcpy(void *, const void *, size_t);
  68 extern int      memcmp(const void *, const void *, size_t);
  69 extern void     *memmove(void *, const void *, size_t);
  70 extern void     *memset(void *, int, size_t);
  71 extern int      memset_s(void *, size_t, int, size_t);
  72
  73 #ifdef XNU_KERNEL_PRIVATE
  74 /* memcmp_zero_ptr_aligned() checks string s of n bytes contains all zeros.
  75  * Address and size of the string s must be pointer-aligned.
  76  * Return 0 if true, 1 otherwise. Also return 0 if n is 0.
  77  */
  78 extern unsigned long memcmp_zero_ptr_aligned(const void *s, size_t n);
  79 #endif
  80
  81 extern size_t   strlen(const char *);
  82 extern size_t   strnlen(const char *, size_t);
  83
  84 /* strcpy() and strncpy() are deprecated. Please use strlcpy() instead. */
  85 __kpi_deprecated_arm64_macos_unavailable
  86 extern char     *strcpy(char *, const char *) __deprecated;
  87
  88 __kpi_deprecated_arm64_macos_unavailable
  89 extern char     *strncpy(char *, const char *, size_t);
  90
  91 /* strcat() and strncat() are deprecated. Please use strlcat() instead. */
  92 __kpi_deprecated_arm64_macos_unavailable
  93 extern char     *strcat(char *, const char *) __deprecated;
  94
  95 __kpi_deprecated_arm64_macos_unavailable
  96 extern char     *strncat(char *, const char *, size_t);
  97
  98 extern int      strcmp(const char *, const char *);
  99 extern int      strncmp(const char *, const char *, size_t);
 100
 101 extern size_t   strlcpy(char *, const char *, size_t);
 102 extern size_t   strlcat(char *, const char *, size_t);
 103
 104 extern int      strcasecmp(const char *s1, const char *s2);
 105 extern int      strncasecmp(const char *s1, const char *s2, size_t n);
 106 #ifdef XNU_KERNEL_PRIVATE
 107 extern const char     *strnstr(const char *s, const char *find, size_t slen);
 108 #else
 109 extern char     *strnstr(const char *s, const char *find, size_t slen);
 110 #endif
 111 extern char     *strchr(const char *s, int c);
 112 #ifdef XNU_KERNEL_PRIVATE
 113 extern char     *strrchr(const char *s, int c);
 114 #endif
 115 extern char     *STRDUP(const char *, int);
 116 extern int      strprefix(const char *s1, const char *s2);
 117
 118 extern int      bcmp(const void *, const void *, size_t);
 119 extern void     bcopy(const void *, void *, size_t);
 120 extern void     bzero(void *, size_t);
 121 extern int      timingsafe_bcmp(const void *b1, const void *b2, size_t n);
 122
 123 #ifdef PRIVATE
 124 #include <san/memintrinsics.h>
 125 #endif
 126
 127 #if __has_builtin(__builtin_dynamic_object_size)
 128 #define XNU_BOS __builtin_dynamic_object_size
 129 #else
 130 #define XNU_BOS __builtin_object_size
 131 #endif
 132
 133
 134 /* __nochk_ functions for opting out of type 1 bounds checking */
 135 __attribute__((always_inline)) static inline void *
 136 __nochk_memcpy(void *dest, const void *src, size_t len)
 137 {
 138         return __builtin___memcpy_chk(dest, src, len, XNU_BOS(dest, 0));
 139 }
 140 __attribute__((always_inline)) static inline void *
 141 __nochk_memmove(void *dest, const void *src, size_t len)
 142 {
 143         return __builtin___memmove_chk(dest, src, len, XNU_BOS(dest, 0));
 144 }
 145 __attribute__((always_inline)) static inline void
 146 __nochk_bcopy(const void *src, void *dest, size_t len)
 147 {
 148         __builtin___memmove_chk(dest, src, len, XNU_BOS(dest, 0));
 149 }
 150
 151 #if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_13
 152 /* older deployment target */
 153 #elif defined(KASAN) || (defined (_FORTIFY_SOURCE) && _FORTIFY_SOURCE == 0)
 154 /* _FORTIFY_SOURCE disabled */
 155 #else /* _chk macros */
 156
 157 #if defined XNU_KERNEL_PRIVATE || defined(_FORTIFY_SOURCE_STRICT)
 158 /* Stricter checking is optional for kexts. When type is set to 1, __builtin_object_size
 159  * returns the size of the closest surrounding sub-object, which would detect copying past
 160  * the end of a struct member. */
 161 #define BOS_COPY_TYPE 1
 162 #else
 163 #define BOS_COPY_TYPE 0
 164 #endif
 165
 166 #if __has_builtin(__builtin___memcpy_chk)
 167 #define memcpy(dest, src, len) __builtin___memcpy_chk(dest, src, len, XNU_BOS(dest, BOS_COPY_TYPE))
 168 #endif
 169
 170 #if __has_builtin(__builtin___memmove_chk)
 171 #define memmove(dest, src, len) __builtin___memmove_chk(dest, src, len, XNU_BOS(dest, BOS_COPY_TYPE))
 172 #endif
 173
 174 #if __has_builtin(__builtin___strncpy_chk)
 175 #define strncpy(dest, src, len) __builtin___strncpy_chk(dest, src, len, XNU_BOS(dest, 1))
 176 #endif
 177
 178 #if __has_builtin(__builtin___strncat_chk)
 179 #define strncat(dest, src, len) __builtin___strncat_chk(dest, src, len, XNU_BOS(dest, 1))
 180 #endif
 181
 182 #if __has_builtin(__builtin___strlcat_chk)
 183 #define strlcat(dest, src, len) __builtin___strlcat_chk(dest, src, len, XNU_BOS(dest, 1))
 184 #endif
 185
 186 #if __has_builtin(__builtin___strlcpy_chk)
 187 #define strlcpy(dest, src, len) __builtin___strlcpy_chk(dest, src, len, XNU_BOS(dest, 1))
 188 #endif
 189
 190 #if __has_builtin(__builtin___strcpy_chk)
 191 #define strcpy(dest, src, len) __builtin___strcpy_chk(dest, src, XNU_BOS(dest, 1))
 192 #endif
 193
 194 #if __has_builtin(__builtin___strcat_chk)
 195 #define strcat(dest, src) __builtin___strcat_chk(dest, src, XNU_BOS(dest, 1))
 196 #endif
 197
 198 #if __has_builtin(__builtin___memmove_chk)
 199 #define bcopy(src, dest, len) __builtin___memmove_chk(dest, src, len, XNU_BOS(dest, BOS_COPY_TYPE))
 200 #endif
 201
 202 #endif /* _chk macros */
 203 #ifdef __cplusplus
 204 }
 205 #endif
 206
 207 #endif  /* _STRING_H_ */