1 /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 */
5
6 #include <dlfcn.h>
7 #include <errno.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <unistd.h>
11
12 #include "libminijail.h"
13
14 #include "elfparse.h"
15 #include "minijail0_cli.h"
16 #include "util.h"
17
main(int argc,char * argv[])18 int main(int argc, char *argv[])
19 {
20 struct minijail *j = minijail_new();
21 const char *dl_mesg = NULL;
22 int exit_immediately = 0;
23 ElfType elftype = ELFERROR;
24 int consumed = parse_args(j, argc, argv, &exit_immediately, &elftype);
25 argc -= consumed;
26 argv += consumed;
27
28 /*
29 * Make the process group ID of this process equal to its PID.
30 * In the non-interactive case (e.g. when minijail0 is started from
31 * init) this ensures the parent process and the jailed process
32 * can be killed together.
33 *
34 * Don't fail on EPERM, since setpgid(0, 0) can only EPERM when
35 * the process is already a process group leader.
36 */
37 if (setpgid(0 /* use calling PID */, 0 /* make PGID = PID */)) {
38 if (errno != EPERM) {
39 fprintf(stderr, "setpgid(0, 0) failed\n");
40 exit(1);
41 }
42 }
43
44 if (elftype == ELFSTATIC) {
45 /*
46 * Target binary is statically linked so we cannot use
47 * libminijailpreload.so.
48 */
49 minijail_run_no_preload(j, argv[0], argv);
50 } else if (elftype == ELFDYNAMIC) {
51 /*
52 * Target binary is dynamically linked so we can
53 * inject libminijailpreload.so into it.
54 */
55
56 /* Check that we can dlopen() libminijailpreload.so. */
57 if (!dlopen(PRELOADPATH, RTLD_LAZY | RTLD_LOCAL)) {
58 dl_mesg = dlerror();
59 fprintf(stderr, "dlopen(): %s\n", dl_mesg);
60 return 1;
61 }
62 minijail_run(j, argv[0], argv);
63 } else {
64 fprintf(stderr,
65 "Target program '%s' is not a valid ELF file.\n",
66 argv[0]);
67 return 1;
68 }
69
70 if (exit_immediately) {
71 info("not running init loop, exiting immediately\n");
72 return 0;
73 }
74 int ret = minijail_wait(j);
75 #if defined(__SANITIZE_ADDRESS__)
76 minijail_destroy(j);
77 #endif /* __SANITIZE_ADDRESS__ */
78 return ret;
79 }
80