Annotation of embedaddon/sudo/src/sudo_noexec.c, revision 1.1.1.5
1.1 misho 1: /*
1.1.1.5 ! misho 2: * Copyright (c) 2004-2005, 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 misho 3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20:
21: #include <errno.h>
22: #include <stdarg.h>
1.1.1.5 ! misho 23: #ifdef HAVE_UNISTD_H
! 24: # include <unistd.h>
! 25: #endif /* HAVE_UNISTD_H */
1.1.1.2 misho 26: #ifdef HAVE_SPAWN_H
27: #include <spawn.h>
28: #endif
1.1 misho 29:
30: #include "missing.h"
31:
1.1.1.5 ! misho 32: #ifdef HAVE___INTERPOSE
1.1 misho 33: /*
1.1.1.5 ! misho 34: * Mac OS X 10.4 and above has support for library symbol interposition.
! 35: * There is a good explanation of this in the Mac OS X Internals book.
! 36: */
! 37: typedef struct interpose_s {
! 38: void *new_func;
! 39: void *orig_func;
! 40: } interpose_t;
! 41:
! 42: # define FN_NAME(fn) dummy_ ## fn
! 43: # define INTERPOSE(fn) \
! 44: __attribute__((__used__)) static const interpose_t interpose_ ## fn \
! 45: __attribute__((__section__("__DATA,__interpose"))) = \
! 46: { (void *)dummy_ ## fn, (void *)fn };
! 47: #else
! 48: # define FN_NAME(fn) fn
! 49: # define INTERPOSE(fn)
! 50: #endif
! 51:
! 52: /*
! 53: * Dummy versions of the exec(3) family of syscalls. It is not enough
! 54: * to just dummy out execve(2) since some C libraries use direct syscalls
! 55: * for the other functions instead of calling execve(2). Note that it is
! 56: * still possible to access the real syscalls via the syscall(2) interface
! 57: * but very few programs actually do that.
1.1 misho 58: */
59:
60: #define DUMMY_BODY \
61: { \
62: errno = EACCES; \
63: return -1; \
64: }
65:
66: #define DUMMY2(fn, t1, t2) \
1.1.1.3 misho 67: __dso_public int \
1.1.1.5 ! misho 68: FN_NAME(fn)(t1 a1, t2 a2) \
! 69: DUMMY_BODY \
! 70: INTERPOSE(fn)
1.1 misho 71:
72: #define DUMMY3(fn, t1, t2, t3) \
1.1.1.3 misho 73: __dso_public int \
1.1.1.5 ! misho 74: FN_NAME(fn)(t1 a1, t2 a2, t3 a3) \
! 75: DUMMY_BODY \
! 76: INTERPOSE(fn)
1.1 misho 77:
1.1.1.2 misho 78: #define DUMMY6(fn, t1, t2, t3, t4, t5, t6) \
1.1.1.3 misho 79: __dso_public int \
1.1.1.5 ! misho 80: FN_NAME(fn)(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6) \
! 81: DUMMY_BODY \
! 82: INTERPOSE(fn)
1.1.1.2 misho 83:
1.1 misho 84: #define DUMMY_VA(fn, t1, t2) \
1.1.1.3 misho 85: __dso_public int \
1.1.1.5 ! misho 86: FN_NAME(fn)(t1 a1, t2 a2, ...) \
! 87: DUMMY_BODY \
! 88: INTERPOSE(fn)
1.1 misho 89:
1.1.1.5 ! misho 90: /*
! 91: * Standard exec(3) family of functions.
! 92: */
1.1 misho 93: DUMMY_VA(execl, const char *, const char *)
1.1.1.5 ! misho 94: DUMMY_VA(execle, const char *, const char *)
! 95: DUMMY_VA(execlp, const char *, const char *)
! 96: DUMMY2(execv, const char *, char * const *)
! 97: DUMMY2(execvp, const char *, char * const *)
! 98: DUMMY3(execve, const char *, char * const *, char * const *)
! 99:
! 100: /*
! 101: * Private versions of the above.
! 102: */
! 103: #ifdef HAVE__EXECL
1.1 misho 104: DUMMY_VA(_execl, const char *, const char *)
1.1.1.5 ! misho 105: #endif
! 106: #ifdef HAVE___EXECL
1.1 misho 107: DUMMY_VA(__execl, const char *, const char *)
1.1.1.5 ! misho 108: #endif
! 109: #ifdef HAVE__EXECLE
1.1 misho 110: DUMMY_VA(_execle, const char *, const char *)
1.1.1.5 ! misho 111: #endif
! 112: #ifdef HAVE___EXECLE
1.1 misho 113: DUMMY_VA(__execle, const char *, const char *)
1.1.1.5 ! misho 114: #endif
! 115: #ifdef HAVE__EXECLP
1.1 misho 116: DUMMY_VA(_execlp, const char *, const char *)
1.1.1.5 ! misho 117: #endif
! 118: #ifdef HAVE___EXECLP
1.1 misho 119: DUMMY_VA(__execlp, const char *, const char *)
1.1.1.5 ! misho 120: #endif
! 121: #ifdef HAVE__EXECV
1.1 misho 122: DUMMY2(_execv, const char *, char * const *)
1.1.1.5 ! misho 123: #endif
! 124: #ifdef HAVE___EXECV
1.1 misho 125: DUMMY2(__execv, const char *, char * const *)
1.1.1.5 ! misho 126: #endif
! 127: #ifdef HAVE__EXECVP
1.1 misho 128: DUMMY2(_execvp, const char *, char * const *)
1.1.1.5 ! misho 129: #endif
! 130: #ifdef HAVE___EXECVP
1.1 misho 131: DUMMY2(__execvp, const char *, char * const *)
1.1.1.5 ! misho 132: #endif
! 133: #ifdef HAVE__EXECVE
! 134: DUMMY3(_execve, const char *, char * const *, char * const *)
! 135: #endif
! 136: #ifdef HAVE___EXECVE
! 137: DUMMY3(__execve, const char *, char * const *, char * const *)
! 138: #endif
! 139:
! 140: /*
! 141: * Non-standard exec functions and corresponding private versions.
! 142: */
! 143: #ifdef HAVE_EXECVP
1.1 misho 144: DUMMY3(execvP, const char *, const char *, char * const *)
1.1.1.5 ! misho 145: #endif
! 146: #ifdef HAVE__EXECVP
1.1 misho 147: DUMMY3(_execvP, const char *, const char *, char * const *)
1.1.1.5 ! misho 148: #endif
! 149: #ifdef HAVE___EXECVP
1.1 misho 150: DUMMY3(__execvP, const char *, const char *, char * const *)
1.1.1.5 ! misho 151: #endif
! 152:
! 153: #ifdef HAVE_EXECVPE
1.1.1.2 misho 154: DUMMY3(execvpe, const char *, char * const *, char * const *)
1.1.1.5 ! misho 155: #endif
! 156: #ifdef HAVE__EXECVPE
1.1.1.2 misho 157: DUMMY3(_execvpe, const char *, char * const *, char * const *)
1.1.1.5 ! misho 158: #endif
! 159: #ifdef HAVE___EXECVPE
1.1.1.2 misho 160: DUMMY3(__execvpe, const char *, char * const *, char * const *)
1.1.1.5 ! misho 161: #endif
! 162:
! 163: #ifdef HAVE_EXECT
! 164: DUMMY3(exect, const char *, char * const *, char * const *)
! 165: #endif
! 166: #ifdef HAVE__EXECT
! 167: DUMMY3(_exect, const char *, char * const *, char * const *)
! 168: #endif
! 169: #ifdef HAVE___EXECT
! 170: DUMMY3(__exect, const char *, char * const *, char * const *)
! 171: #endif
! 172:
! 173: #ifdef HAVE_FEXECVE
1.1 misho 174: DUMMY3(fexecve, int , char * const *, char * const *)
1.1.1.5 ! misho 175: #endif
! 176: #ifdef HAVE__FEXECVE
1.1 misho 177: DUMMY3(_fexecve, int , char * const *, char * const *)
1.1.1.5 ! misho 178: #endif
! 179: #ifdef HAVE___FEXECVE
1.1 misho 180: DUMMY3(__fexecve, int , char * const *, char * const *)
1.1.1.5 ! misho 181: #endif
! 182:
! 183: /*
! 184: * posix_spawn, posix_spawnp and any private versions.
! 185: */
! 186: #ifdef HAVE_POSIX_SPAWN
1.1.1.2 misho 187: DUMMY6(posix_spawn, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 188: #endif
! 189: #ifdef HAVE__POSIX_SPAWN
1.1.1.2 misho 190: DUMMY6(_posix_spawn, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 191: #endif
! 192: #ifdef HAVE___POSIX_SPAWN
1.1.1.2 misho 193: DUMMY6(__posix_spawn, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 194: #endif
! 195:
! 196: #ifdef HAVE_POSIX_SPAWNP
1.1.1.2 misho 197: DUMMY6(posix_spawnp, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 198: #endif
! 199: #ifdef HAVE_POSIX__SPAWNP
1.1.1.2 misho 200: DUMMY6(_posix_spawnp, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 201: #endif
! 202: #ifdef HAVE_POSIX___SPAWNP
1.1.1.2 misho 203: DUMMY6(__posix_spawnp, pid_t *, const char *, const posix_spawn_file_actions_t *, const posix_spawnattr_t *, char * const *, char * const *)
1.1.1.5 ! misho 204: #endif
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