1 /*
2 ** Copyright 2008, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #include <inttypes.h>
18 #include <sys/capability.h>
19 #include "installd.h"
20 #include <cutils/sched_policy.h>
21 #include <diskusage/dirsize.h>
22 #include <selinux/android.h>
23 #include <system/thread_defs.h>
24
25 /* Directory records that are used in execution of commands. */
26 dir_rec_t android_data_dir;
27 dir_rec_t android_asec_dir;
28 dir_rec_t android_app_dir;
29 dir_rec_t android_app_private_dir;
30 dir_rec_t android_app_lib_dir;
31 dir_rec_t android_media_dir;
32 dir_rec_array_t android_system_dirs;
33
install(const char * pkgname,uid_t uid,gid_t gid,const char * seinfo)34 int install(const char *pkgname, uid_t uid, gid_t gid, const char *seinfo)
35 {
36 char pkgdir[PKG_PATH_MAX];
37 char libsymlink[PKG_PATH_MAX];
38 char applibdir[PKG_PATH_MAX];
39 struct stat libStat;
40
41 if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
42 ALOGE("invalid uid/gid: %d %d\n", uid, gid);
43 return -1;
44 }
45
46 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
47 ALOGE("cannot create package path\n");
48 return -1;
49 }
50
51 if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, 0)) {
52 ALOGE("cannot create package lib symlink origin path\n");
53 return -1;
54 }
55
56 if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
57 ALOGE("cannot create package lib symlink dest path\n");
58 return -1;
59 }
60
61 if (mkdir(pkgdir, 0751) < 0) {
62 ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
63 return -1;
64 }
65 if (chmod(pkgdir, 0751) < 0) {
66 ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
67 unlink(pkgdir);
68 return -1;
69 }
70
71 if (lstat(libsymlink, &libStat) < 0) {
72 if (errno != ENOENT) {
73 ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
74 return -1;
75 }
76 } else {
77 if (S_ISDIR(libStat.st_mode)) {
78 if (delete_dir_contents(libsymlink, 1, NULL) < 0) {
79 ALOGE("couldn't delete lib directory during install for: %s", libsymlink);
80 return -1;
81 }
82 } else if (S_ISLNK(libStat.st_mode)) {
83 if (unlink(libsymlink) < 0) {
84 ALOGE("couldn't unlink lib directory during install for: %s", libsymlink);
85 return -1;
86 }
87 }
88 }
89
90 if (selinux_android_setfilecon(pkgdir, pkgname, seinfo, uid) < 0) {
91 ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
92 unlink(libsymlink);
93 unlink(pkgdir);
94 return -errno;
95 }
96
97 if (symlink(applibdir, libsymlink) < 0) {
98 ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, applibdir,
99 strerror(errno));
100 unlink(pkgdir);
101 return -1;
102 }
103
104 if (chown(pkgdir, uid, gid) < 0) {
105 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
106 unlink(libsymlink);
107 unlink(pkgdir);
108 return -1;
109 }
110
111 return 0;
112 }
113
uninstall(const char * pkgname,userid_t userid)114 int uninstall(const char *pkgname, userid_t userid)
115 {
116 char pkgdir[PKG_PATH_MAX];
117
118 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid))
119 return -1;
120
121 remove_profile_file(pkgname);
122
123 /* delete contents AND directory, no exceptions */
124 return delete_dir_contents(pkgdir, 1, NULL);
125 }
126
renamepkg(const char * oldpkgname,const char * newpkgname)127 int renamepkg(const char *oldpkgname, const char *newpkgname)
128 {
129 char oldpkgdir[PKG_PATH_MAX];
130 char newpkgdir[PKG_PATH_MAX];
131
132 if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
133 return -1;
134 if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
135 return -1;
136
137 if (rename(oldpkgdir, newpkgdir) < 0) {
138 ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
139 return -errno;
140 }
141 return 0;
142 }
143
fix_uid(const char * pkgname,uid_t uid,gid_t gid)144 int fix_uid(const char *pkgname, uid_t uid, gid_t gid)
145 {
146 char pkgdir[PKG_PATH_MAX];
147 struct stat s;
148 int rc = 0;
149
150 if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
151 ALOGE("invalid uid/gid: %d %d\n", uid, gid);
152 return -1;
153 }
154
155 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
156 ALOGE("cannot create package path\n");
157 return -1;
158 }
159
160 if (stat(pkgdir, &s) < 0) return -1;
161
162 if (s.st_uid != 0 || s.st_gid != 0) {
163 ALOGE("fixing uid of non-root pkg: %s %" PRIu32 " %" PRIu32 "\n", pkgdir, s.st_uid, s.st_gid);
164 return -1;
165 }
166
167 if (chmod(pkgdir, 0751) < 0) {
168 ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
169 unlink(pkgdir);
170 return -errno;
171 }
172 if (chown(pkgdir, uid, gid) < 0) {
173 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
174 unlink(pkgdir);
175 return -errno;
176 }
177
178 return 0;
179 }
180
delete_user_data(const char * pkgname,userid_t userid)181 int delete_user_data(const char *pkgname, userid_t userid)
182 {
183 char pkgdir[PKG_PATH_MAX];
184
185 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid))
186 return -1;
187
188 return delete_dir_contents(pkgdir, 0, NULL);
189 }
190
make_user_data(const char * pkgname,uid_t uid,userid_t userid,const char * seinfo)191 int make_user_data(const char *pkgname, uid_t uid, userid_t userid, const char* seinfo)
192 {
193 char pkgdir[PKG_PATH_MAX];
194 char applibdir[PKG_PATH_MAX];
195 char libsymlink[PKG_PATH_MAX];
196 struct stat libStat;
197
198 // Create the data dir for the package
199 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid)) {
200 return -1;
201 }
202 if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, userid)) {
203 ALOGE("cannot create package lib symlink origin path\n");
204 return -1;
205 }
206 if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
207 ALOGE("cannot create package lib symlink dest path\n");
208 return -1;
209 }
210
211 if (mkdir(pkgdir, 0751) < 0) {
212 ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
213 return -errno;
214 }
215 if (chmod(pkgdir, 0751) < 0) {
216 ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
217 unlink(pkgdir);
218 return -errno;
219 }
220
221 if (lstat(libsymlink, &libStat) < 0) {
222 if (errno != ENOENT) {
223 ALOGE("couldn't stat lib dir for non-primary: %s\n", strerror(errno));
224 unlink(pkgdir);
225 return -1;
226 }
227 } else {
228 if (S_ISDIR(libStat.st_mode)) {
229 if (delete_dir_contents(libsymlink, 1, NULL) < 0) {
230 ALOGE("couldn't delete lib directory during install for non-primary: %s",
231 libsymlink);
232 unlink(pkgdir);
233 return -1;
234 }
235 } else if (S_ISLNK(libStat.st_mode)) {
236 if (unlink(libsymlink) < 0) {
237 ALOGE("couldn't unlink lib directory during install for non-primary: %s",
238 libsymlink);
239 unlink(pkgdir);
240 return -1;
241 }
242 }
243 }
244
245 if (selinux_android_setfilecon(pkgdir, pkgname, seinfo, uid) < 0) {
246 ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
247 unlink(libsymlink);
248 unlink(pkgdir);
249 return -errno;
250 }
251
252 if (symlink(applibdir, libsymlink) < 0) {
253 ALOGE("couldn't symlink directory for non-primary '%s' -> '%s': %s\n", libsymlink,
254 applibdir, strerror(errno));
255 unlink(pkgdir);
256 return -1;
257 }
258
259 if (chown(pkgdir, uid, uid) < 0) {
260 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
261 unlink(libsymlink);
262 unlink(pkgdir);
263 return -errno;
264 }
265
266 return 0;
267 }
268
make_user_config(userid_t userid)269 int make_user_config(userid_t userid)
270 {
271 if (ensure_config_user_dirs(userid) == -1) {
272 return -1;
273 }
274
275 return 0;
276 }
277
delete_user(userid_t userid)278 int delete_user(userid_t userid)
279 {
280 int status = 0;
281
282 char data_path[PKG_PATH_MAX];
283 if ((create_user_path(data_path, userid) != 0)
284 || (delete_dir_contents(data_path, 1, NULL) != 0)) {
285 status = -1;
286 }
287
288 char media_path[PATH_MAX];
289 if ((create_user_media_path(media_path, userid) != 0)
290 || (delete_dir_contents(media_path, 1, NULL) != 0)) {
291 status = -1;
292 }
293
294 char config_path[PATH_MAX];
295 if ((create_user_config_path(config_path, userid) != 0)
296 || (delete_dir_contents(config_path, 1, NULL) != 0)) {
297 status = -1;
298 }
299
300 return status;
301 }
302
delete_cache(const char * pkgname,userid_t userid)303 int delete_cache(const char *pkgname, userid_t userid)
304 {
305 char cachedir[PKG_PATH_MAX];
306
307 if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, userid))
308 return -1;
309
310 /* delete contents, not the directory, no exceptions */
311 return delete_dir_contents(cachedir, 0, NULL);
312 }
313
delete_code_cache(const char * pkgname,userid_t userid)314 int delete_code_cache(const char *pkgname, userid_t userid)
315 {
316 char codecachedir[PKG_PATH_MAX];
317 struct stat s;
318
319 if (create_pkg_path(codecachedir, pkgname, CODE_CACHE_DIR_POSTFIX, userid))
320 return -1;
321
322 /* it's okay if code cache is missing */
323 if (lstat(codecachedir, &s) == -1 && errno == ENOENT) {
324 return 0;
325 }
326
327 /* delete contents, not the directory, no exceptions */
328 return delete_dir_contents(codecachedir, 0, NULL);
329 }
330
331 /* Try to ensure free_size bytes of storage are available.
332 * Returns 0 on success.
333 * This is rather simple-minded because doing a full LRU would
334 * be potentially memory-intensive, and without atime it would
335 * also require that apps constantly modify file metadata even
336 * when just reading from the cache, which is pretty awful.
337 */
free_cache(int64_t free_size)338 int free_cache(int64_t free_size)
339 {
340 cache_t* cache;
341 int64_t avail;
342 DIR *d;
343 struct dirent *de;
344 char tmpdir[PATH_MAX];
345 char *dirpos;
346
347 avail = data_disk_free();
348 if (avail < 0) return -1;
349
350 ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
351 if (avail >= free_size) return 0;
352
353 cache = start_cache_collection();
354
355 // Collect cache files for primary user.
356 if (create_user_path(tmpdir, 0) == 0) {
357 //ALOGI("adding cache files from %s\n", tmpdir);
358 add_cache_files(cache, tmpdir, "cache");
359 }
360
361 // Search for other users and add any cache files from them.
362 snprintf(tmpdir, sizeof(tmpdir), "%s%s", android_data_dir.path,
363 SECONDARY_USER_PREFIX);
364 dirpos = tmpdir + strlen(tmpdir);
365 d = opendir(tmpdir);
366 if (d != NULL) {
367 while ((de = readdir(d))) {
368 if (de->d_type == DT_DIR) {
369 const char *name = de->d_name;
370 /* always skip "." and ".." */
371 if (name[0] == '.') {
372 if (name[1] == 0) continue;
373 if ((name[1] == '.') && (name[2] == 0)) continue;
374 }
375 if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
376 strcpy(dirpos, name);
377 //ALOGI("adding cache files from %s\n", tmpdir);
378 add_cache_files(cache, tmpdir, "cache");
379 } else {
380 ALOGW("Path exceeds limit: %s%s", tmpdir, name);
381 }
382 }
383 }
384 closedir(d);
385 }
386
387 // Collect cache files on external storage for all users (if it is mounted as part
388 // of the internal storage).
389 strcpy(tmpdir, android_media_dir.path);
390 dirpos = tmpdir + strlen(tmpdir);
391 d = opendir(tmpdir);
392 if (d != NULL) {
393 while ((de = readdir(d))) {
394 if (de->d_type == DT_DIR) {
395 const char *name = de->d_name;
396 /* skip any dir that doesn't start with a number, so not a user */
397 if (name[0] < '0' || name[0] > '9') {
398 continue;
399 }
400 if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
401 strcpy(dirpos, name);
402 if (lookup_media_dir(tmpdir, "Android") == 0
403 && lookup_media_dir(tmpdir, "data") == 0) {
404 //ALOGI("adding cache files from %s\n", tmpdir);
405 add_cache_files(cache, tmpdir, "cache");
406 }
407 } else {
408 ALOGW("Path exceeds limit: %s%s", tmpdir, name);
409 }
410 }
411 }
412 closedir(d);
413 }
414
415 clear_cache_files(cache, free_size);
416 finish_cache_collection(cache);
417
418 return data_disk_free() >= free_size ? 0 : -1;
419 }
420
move_dex(const char * src,const char * dst,const char * instruction_set)421 int move_dex(const char *src, const char *dst, const char *instruction_set)
422 {
423 char src_dex[PKG_PATH_MAX];
424 char dst_dex[PKG_PATH_MAX];
425
426 if (validate_apk_path(src)) {
427 ALOGE("invalid apk path '%s' (bad prefix)\n", src);
428 return -1;
429 }
430 if (validate_apk_path(dst)) {
431 ALOGE("invalid apk path '%s' (bad prefix)\n", dst);
432 return -1;
433 }
434
435 if (create_cache_path(src_dex, src, instruction_set)) return -1;
436 if (create_cache_path(dst_dex, dst, instruction_set)) return -1;
437
438 ALOGV("move %s -> %s\n", src_dex, dst_dex);
439 if (rename(src_dex, dst_dex) < 0) {
440 ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
441 return -1;
442 } else {
443 return 0;
444 }
445 }
446
rm_dex(const char * path,const char * instruction_set)447 int rm_dex(const char *path, const char *instruction_set)
448 {
449 char dex_path[PKG_PATH_MAX];
450
451 if (validate_apk_path(path) && validate_system_app_path(path)) {
452 ALOGE("invalid apk path '%s' (bad prefix)\n", path);
453 return -1;
454 }
455
456 if (create_cache_path(dex_path, path, instruction_set)) return -1;
457
458 ALOGV("unlink %s\n", dex_path);
459 if (unlink(dex_path) < 0) {
460 if (errno != ENOENT) {
461 ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
462 }
463 return -1;
464 } else {
465 return 0;
466 }
467 }
468
get_size(const char * pkgname,userid_t userid,const char * apkpath,const char * libdirpath,const char * fwdlock_apkpath,const char * asecpath,const char * instruction_set,int64_t * _codesize,int64_t * _datasize,int64_t * _cachesize,int64_t * _asecsize)469 int get_size(const char *pkgname, userid_t userid, const char *apkpath,
470 const char *libdirpath, const char *fwdlock_apkpath, const char *asecpath,
471 const char *instruction_set, int64_t *_codesize, int64_t *_datasize,
472 int64_t *_cachesize, int64_t* _asecsize)
473 {
474 DIR *d;
475 int dfd;
476 struct dirent *de;
477 struct stat s;
478 char path[PKG_PATH_MAX];
479
480 int64_t codesize = 0;
481 int64_t datasize = 0;
482 int64_t cachesize = 0;
483 int64_t asecsize = 0;
484
485 /* count the source apk as code -- but only if it's not
486 * on the /system partition and its not on the sdcard.
487 */
488 if (validate_system_app_path(apkpath) &&
489 strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
490 if (stat(apkpath, &s) == 0) {
491 codesize += stat_size(&s);
492 }
493 }
494 /* count the forward locked apk as code if it is given
495 */
496 if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
497 if (stat(fwdlock_apkpath, &s) == 0) {
498 codesize += stat_size(&s);
499 }
500 }
501 /* count the cached dexfile as code */
502 if (!create_cache_path(path, apkpath, instruction_set)) {
503 if (stat(path, &s) == 0) {
504 codesize += stat_size(&s);
505 }
506 }
507
508 /* add in size of any libraries */
509 if (libdirpath != NULL && libdirpath[0] != '!') {
510 d = opendir(libdirpath);
511 if (d != NULL) {
512 dfd = dirfd(d);
513 codesize += calculate_dir_size(dfd);
514 closedir(d);
515 }
516 }
517
518 /* compute asec size if it is given
519 */
520 if (asecpath != NULL && asecpath[0] != '!') {
521 if (stat(asecpath, &s) == 0) {
522 asecsize += stat_size(&s);
523 }
524 }
525
526 if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, userid)) {
527 goto done;
528 }
529
530 d = opendir(path);
531 if (d == NULL) {
532 goto done;
533 }
534 dfd = dirfd(d);
535
536 /* most stuff in the pkgdir is data, except for the "cache"
537 * directory and below, which is cache, and the "lib" directory
538 * and below, which is code...
539 */
540 while ((de = readdir(d))) {
541 const char *name = de->d_name;
542
543 if (de->d_type == DT_DIR) {
544 int subfd;
545 int64_t statsize = 0;
546 int64_t dirsize = 0;
547 /* always skip "." and ".." */
548 if (name[0] == '.') {
549 if (name[1] == 0) continue;
550 if ((name[1] == '.') && (name[2] == 0)) continue;
551 }
552 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
553 statsize = stat_size(&s);
554 }
555 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
556 if (subfd >= 0) {
557 dirsize = calculate_dir_size(subfd);
558 }
559 if(!strcmp(name,"lib")) {
560 codesize += dirsize + statsize;
561 } else if(!strcmp(name,"cache")) {
562 cachesize += dirsize + statsize;
563 } else {
564 datasize += dirsize + statsize;
565 }
566 } else if (de->d_type == DT_LNK && !strcmp(name,"lib")) {
567 // This is the symbolic link to the application's library
568 // code. We'll count this as code instead of data, since
569 // it is not something that the app creates.
570 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
571 codesize += stat_size(&s);
572 }
573 } else {
574 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
575 datasize += stat_size(&s);
576 }
577 }
578 }
579 closedir(d);
580 done:
581 *_codesize = codesize;
582 *_datasize = datasize;
583 *_cachesize = cachesize;
584 *_asecsize = asecsize;
585 return 0;
586 }
587
create_cache_path(char path[PKG_PATH_MAX],const char * src,const char * instruction_set)588 int create_cache_path(char path[PKG_PATH_MAX], const char *src, const char *instruction_set)
589 {
590 char *tmp;
591 int srclen;
592 int dstlen;
593
594 srclen = strlen(src);
595
596 /* demand that we are an absolute path */
597 if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
598 return -1;
599 }
600
601 if (srclen > PKG_PATH_MAX) { // XXX: PKG_NAME_MAX?
602 return -1;
603 }
604
605 dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
606 strlen(instruction_set) +
607 strlen(DALVIK_CACHE_POSTFIX) + 2;
608
609 if (dstlen > PKG_PATH_MAX) {
610 return -1;
611 }
612
613 sprintf(path,"%s%s/%s%s",
614 DALVIK_CACHE_PREFIX,
615 instruction_set,
616 src + 1, /* skip the leading / */
617 DALVIK_CACHE_POSTFIX);
618
619 for(tmp = path + strlen(DALVIK_CACHE_PREFIX) + strlen(instruction_set) + 1; *tmp; tmp++) {
620 if (*tmp == '/') {
621 *tmp = '@';
622 }
623 }
624
625 return 0;
626 }
627
run_dexopt(int zip_fd,int odex_fd,const char * input_file_name,const char * output_file_name)628 static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
629 const char* output_file_name)
630 {
631 /* platform-specific flags affecting optimization and verification */
632 char dexopt_flags[PROPERTY_VALUE_MAX];
633 property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
634 ALOGV("dalvik.vm.dexopt-flags=%s\n", dexopt_flags);
635
636 static const char* DEX_OPT_BIN = "/system/bin/dexopt";
637 static const int MAX_INT_LEN = 12; // '-'+10dig+'\0' -OR- 0x+8dig
638 char zip_num[MAX_INT_LEN];
639 char odex_num[MAX_INT_LEN];
640
641 sprintf(zip_num, "%d", zip_fd);
642 sprintf(odex_num, "%d", odex_fd);
643
644 ALOGV("Running %s in=%s out=%s\n", DEX_OPT_BIN, input_file_name, output_file_name);
645 execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
646 dexopt_flags, (char*) NULL);
647 ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
648 }
649
run_patchoat(int input_fd,int oat_fd,const char * input_file_name,const char * output_file_name,const char * pkgname,const char * instruction_set)650 static void run_patchoat(int input_fd, int oat_fd, const char* input_file_name,
651 const char* output_file_name, const char *pkgname, const char *instruction_set)
652 {
653 static const int MAX_INT_LEN = 12; // '-'+10dig+'\0' -OR- 0x+8dig
654 static const unsigned int MAX_INSTRUCTION_SET_LEN = 7;
655
656 static const char* PATCHOAT_BIN = "/system/bin/patchoat";
657 if (strlen(instruction_set) >= MAX_INSTRUCTION_SET_LEN) {
658 ALOGE("Instruction set %s longer than max length of %d",
659 instruction_set, MAX_INSTRUCTION_SET_LEN);
660 return;
661 }
662
663 /* input_file_name/input_fd should be the .odex/.oat file that is precompiled. I think*/
664 char instruction_set_arg[strlen("--instruction-set=") + MAX_INSTRUCTION_SET_LEN];
665 char output_oat_fd_arg[strlen("--output-oat-fd=") + MAX_INT_LEN];
666 char input_oat_fd_arg[strlen("--input-oat-fd=") + MAX_INT_LEN];
667 const char* patched_image_location_arg = "--patched-image-location=/system/framework/boot.art";
668 // The caller has already gotten all the locks we need.
669 const char* no_lock_arg = "--no-lock-output";
670 sprintf(instruction_set_arg, "--instruction-set=%s", instruction_set);
671 sprintf(output_oat_fd_arg, "--output-oat-fd=%d", oat_fd);
672 sprintf(input_oat_fd_arg, "--input-oat-fd=%d", input_fd);
673 ALOGE("Running %s isa=%s in-fd=%d (%s) out-fd=%d (%s)\n",
674 PATCHOAT_BIN, instruction_set, input_fd, input_file_name, oat_fd, output_file_name);
675
676 /* patchoat, patched-image-location, no-lock, isa, input-fd, output-fd */
677 char* argv[7];
678 argv[0] = (char*) PATCHOAT_BIN;
679 argv[1] = (char*) patched_image_location_arg;
680 argv[2] = (char*) no_lock_arg;
681 argv[3] = instruction_set_arg;
682 argv[4] = output_oat_fd_arg;
683 argv[5] = input_oat_fd_arg;
684 argv[6] = NULL;
685
686 execv(PATCHOAT_BIN, (char* const *)argv);
687 ALOGE("execv(%s) failed: %s\n", PATCHOAT_BIN, strerror(errno));
688 }
689
run_dex2oat(int zip_fd,int oat_fd,const char * input_file_name,const char * output_file_name,int swap_fd,const char * pkgname,const char * instruction_set,bool vm_safe_mode)690 static void run_dex2oat(int zip_fd, int oat_fd, const char* input_file_name,
691 const char* output_file_name, int swap_fd, const char *pkgname, const char *instruction_set,
692 bool vm_safe_mode)
693 {
694 static const unsigned int MAX_INSTRUCTION_SET_LEN = 7;
695
696 if (strlen(instruction_set) >= MAX_INSTRUCTION_SET_LEN) {
697 ALOGE("Instruction set %s longer than max length of %d",
698 instruction_set, MAX_INSTRUCTION_SET_LEN);
699 return;
700 }
701
702 char prop_buf[PROPERTY_VALUE_MAX];
703 bool profiler = (property_get("dalvik.vm.profiler", prop_buf, "0") > 0) && (prop_buf[0] == '1');
704
705 char dex2oat_Xms_flag[PROPERTY_VALUE_MAX];
706 bool have_dex2oat_Xms_flag = property_get("dalvik.vm.dex2oat-Xms", dex2oat_Xms_flag, NULL) > 0;
707
708 char dex2oat_Xmx_flag[PROPERTY_VALUE_MAX];
709 bool have_dex2oat_Xmx_flag = property_get("dalvik.vm.dex2oat-Xmx", dex2oat_Xmx_flag, NULL) > 0;
710
711 char dex2oat_compiler_filter_flag[PROPERTY_VALUE_MAX];
712 bool have_dex2oat_compiler_filter_flag = property_get("dalvik.vm.dex2oat-filter",
713 dex2oat_compiler_filter_flag, NULL) > 0;
714
715 char dex2oat_isa_features_key[PROPERTY_KEY_MAX];
716 sprintf(dex2oat_isa_features_key, "dalvik.vm.isa.%s.features", instruction_set);
717 char dex2oat_isa_features[PROPERTY_VALUE_MAX];
718 bool have_dex2oat_isa_features = property_get(dex2oat_isa_features_key,
719 dex2oat_isa_features, NULL) > 0;
720
721 char dex2oat_flags[PROPERTY_VALUE_MAX];
722 bool have_dex2oat_flags = property_get("dalvik.vm.dex2oat-flags", dex2oat_flags, NULL) > 0;
723 ALOGV("dalvik.vm.dex2oat-flags=%s\n", dex2oat_flags);
724
725 // If we booting without the real /data, don't spend time compiling.
726 char vold_decrypt[PROPERTY_VALUE_MAX];
727 bool have_vold_decrypt = property_get("vold.decrypt", vold_decrypt, "") > 0;
728 bool skip_compilation = (have_vold_decrypt &&
729 (strcmp(vold_decrypt, "trigger_restart_min_framework") == 0 ||
730 (strcmp(vold_decrypt, "1") == 0)));
731
732 static const char* DEX2OAT_BIN = "/system/bin/dex2oat";
733
734 static const char* RUNTIME_ARG = "--runtime-arg";
735
736 static const int MAX_INT_LEN = 12; // '-'+10dig+'\0' -OR- 0x+8dig
737
738 char zip_fd_arg[strlen("--zip-fd=") + MAX_INT_LEN];
739 char zip_location_arg[strlen("--zip-location=") + PKG_PATH_MAX];
740 char oat_fd_arg[strlen("--oat-fd=") + MAX_INT_LEN];
741 char oat_location_arg[strlen("--oat-location=") + PKG_PATH_MAX];
742 char instruction_set_arg[strlen("--instruction-set=") + MAX_INSTRUCTION_SET_LEN];
743 char instruction_set_features_arg[strlen("--instruction-set-features=") + PROPERTY_VALUE_MAX];
744 char profile_file_arg[strlen("--profile-file=") + PKG_PATH_MAX];
745 char top_k_profile_threshold_arg[strlen("--top-k-profile-threshold=") + PROPERTY_VALUE_MAX];
746 char dex2oat_Xms_arg[strlen("-Xms") + PROPERTY_VALUE_MAX];
747 char dex2oat_Xmx_arg[strlen("-Xmx") + PROPERTY_VALUE_MAX];
748 char dex2oat_compiler_filter_arg[strlen("--compiler-filter=") + PROPERTY_VALUE_MAX];
749 bool have_dex2oat_swap_fd = false;
750 char dex2oat_swap_fd[strlen("--swap-fd=") + MAX_INT_LEN];
751
752 sprintf(zip_fd_arg, "--zip-fd=%d", zip_fd);
753 sprintf(zip_location_arg, "--zip-location=%s", input_file_name);
754 sprintf(oat_fd_arg, "--oat-fd=%d", oat_fd);
755 sprintf(oat_location_arg, "--oat-location=%s", output_file_name);
756 sprintf(instruction_set_arg, "--instruction-set=%s", instruction_set);
757 sprintf(instruction_set_features_arg, "--instruction-set-features=%s", dex2oat_isa_features);
758 if (swap_fd >= 0) {
759 have_dex2oat_swap_fd = true;
760 sprintf(dex2oat_swap_fd, "--swap-fd=%d", swap_fd);
761 }
762
763 bool have_profile_file = false;
764 bool have_top_k_profile_threshold = false;
765 if (profiler && (strcmp(pkgname, "*") != 0)) {
766 char profile_file[PKG_PATH_MAX];
767 snprintf(profile_file, sizeof(profile_file), "%s/%s",
768 DALVIK_CACHE_PREFIX "profiles", pkgname);
769 struct stat st;
770 if ((stat(profile_file, &st) == 0) && (st.st_size > 0)) {
771 sprintf(profile_file_arg, "--profile-file=%s", profile_file);
772 have_profile_file = true;
773 if (property_get("dalvik.vm.profile.top-k-thr", prop_buf, NULL) > 0) {
774 snprintf(top_k_profile_threshold_arg, sizeof(top_k_profile_threshold_arg),
775 "--top-k-profile-threshold=%s", prop_buf);
776 have_top_k_profile_threshold = true;
777 }
778 }
779 }
780
781 if (have_dex2oat_Xms_flag) {
782 sprintf(dex2oat_Xms_arg, "-Xms%s", dex2oat_Xms_flag);
783 }
784 if (have_dex2oat_Xmx_flag) {
785 sprintf(dex2oat_Xmx_arg, "-Xmx%s", dex2oat_Xmx_flag);
786 }
787 if (skip_compilation) {
788 strcpy(dex2oat_compiler_filter_arg, "--compiler-filter=verify-none");
789 have_dex2oat_compiler_filter_flag = true;
790 } else if (vm_safe_mode) {
791 strcpy(dex2oat_compiler_filter_arg, "--compiler-filter=interpret-only");
792 have_dex2oat_compiler_filter_flag = true;
793 } else if (have_dex2oat_compiler_filter_flag) {
794 sprintf(dex2oat_compiler_filter_arg, "--compiler-filter=%s", dex2oat_compiler_filter_flag);
795 }
796
797 ALOGV("Running %s in=%s out=%s\n", DEX2OAT_BIN, input_file_name, output_file_name);
798
799 char* argv[7 // program name, mandatory arguments and the final NULL
800 + (have_dex2oat_isa_features ? 1 : 0)
801 + (have_profile_file ? 1 : 0)
802 + (have_top_k_profile_threshold ? 1 : 0)
803 + (have_dex2oat_Xms_flag ? 2 : 0)
804 + (have_dex2oat_Xmx_flag ? 2 : 0)
805 + (have_dex2oat_compiler_filter_flag ? 1 : 0)
806 + (have_dex2oat_flags ? 1 : 0)
807 + (have_dex2oat_swap_fd ? 1 : 0)];
808 int i = 0;
809 argv[i++] = (char*)DEX2OAT_BIN;
810 argv[i++] = zip_fd_arg;
811 argv[i++] = zip_location_arg;
812 argv[i++] = oat_fd_arg;
813 argv[i++] = oat_location_arg;
814 argv[i++] = instruction_set_arg;
815 if (have_dex2oat_isa_features) {
816 argv[i++] = instruction_set_features_arg;
817 }
818 if (have_profile_file) {
819 argv[i++] = profile_file_arg;
820 }
821 if (have_top_k_profile_threshold) {
822 argv[i++] = top_k_profile_threshold_arg;
823 }
824 if (have_dex2oat_Xms_flag) {
825 argv[i++] = (char*)RUNTIME_ARG;
826 argv[i++] = dex2oat_Xms_arg;
827 }
828 if (have_dex2oat_Xmx_flag) {
829 argv[i++] = (char*)RUNTIME_ARG;
830 argv[i++] = dex2oat_Xmx_arg;
831 }
832 if (have_dex2oat_compiler_filter_flag) {
833 argv[i++] = dex2oat_compiler_filter_arg;
834 }
835 if (have_dex2oat_flags) {
836 argv[i++] = dex2oat_flags;
837 }
838 if (have_dex2oat_swap_fd) {
839 argv[i++] = dex2oat_swap_fd;
840 }
841 // Do not add after dex2oat_flags, they should override others for debugging.
842 argv[i] = NULL;
843
844 execv(DEX2OAT_BIN, (char* const *)argv);
845 ALOGE("execl(%s) failed: %s\n", DEX2OAT_BIN, strerror(errno));
846 }
847
wait_child(pid_t pid)848 static int wait_child(pid_t pid)
849 {
850 int status;
851 pid_t got_pid;
852
853 while (1) {
854 got_pid = waitpid(pid, &status, 0);
855 if (got_pid == -1 && errno == EINTR) {
856 printf("waitpid interrupted, retrying\n");
857 } else {
858 break;
859 }
860 }
861 if (got_pid != pid) {
862 ALOGW("waitpid failed: wanted %d, got %d: %s\n",
863 (int) pid, (int) got_pid, strerror(errno));
864 return 1;
865 }
866
867 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
868 return 0;
869 } else {
870 return status; /* always nonzero */
871 }
872 }
873
874 /*
875 * Whether dexopt should use a swap file when compiling an APK. If kAlwaysProvideSwapFile, do this
876 * on all devices (dex2oat will make a more informed decision itself, anyways). Otherwise, only do
877 * this on a low-mem device.
878 */
879 static bool kAlwaysProvideSwapFile = true;
880
ShouldUseSwapFileForDexopt()881 static bool ShouldUseSwapFileForDexopt() {
882 if (kAlwaysProvideSwapFile) {
883 return true;
884 }
885
886 char low_mem_buf[PROPERTY_VALUE_MAX];
887 property_get("ro.config.low_ram", low_mem_buf, "");
888 return (strcmp(low_mem_buf, "true") == 0);
889 }
890
dexopt(const char * apk_path,uid_t uid,bool is_public,const char * pkgname,const char * instruction_set,bool vm_safe_mode,bool is_patchoat)891 int dexopt(const char *apk_path, uid_t uid, bool is_public,
892 const char *pkgname, const char *instruction_set,
893 bool vm_safe_mode, bool is_patchoat)
894 {
895 struct utimbuf ut;
896 struct stat input_stat, dex_stat;
897 char out_path[PKG_PATH_MAX];
898 char persist_sys_dalvik_vm_lib[PROPERTY_VALUE_MAX];
899 char swap_file_name[PKG_PATH_MAX];
900 char *end;
901 const char *input_file;
902 char in_odex_path[PKG_PATH_MAX];
903 int res, input_fd=-1, out_fd=-1, swap_fd=-1;
904
905 // Early best-effort check whether we can fit the the path into our buffers.
906 // Note: the cache path will require an additional 5 bytes for ".swap", but we'll try to run
907 // without a swap file, if necessary.
908 if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
909 return -1;
910 }
911
912 /* The command to run depend on the value of persist.sys.dalvik.vm.lib */
913 property_get("persist.sys.dalvik.vm.lib.2", persist_sys_dalvik_vm_lib, "libart.so");
914
915 if (is_patchoat && strncmp(persist_sys_dalvik_vm_lib, "libart", 6) != 0) {
916 /* We may only patch if we are libart */
917 ALOGE("Patching is only supported in libart\n");
918 return -1;
919 }
920
921 /* Before anything else: is there a .odex file? If so, we have
922 * precompiled the apk and there is nothing to do here.
923 *
924 * We skip this if we are doing a patchoat.
925 */
926 strcpy(out_path, apk_path);
927 end = strrchr(out_path, '.');
928 if (end != NULL && !is_patchoat) {
929 strcpy(end, ".odex");
930 if (stat(out_path, &dex_stat) == 0) {
931 return 0;
932 }
933 }
934
935 if (create_cache_path(out_path, apk_path, instruction_set)) {
936 return -1;
937 }
938
939 if (is_patchoat) {
940 /* /system/framework/whatever.jar -> /system/framework/<isa>/whatever.odex */
941 strcpy(in_odex_path, apk_path);
942 end = strrchr(in_odex_path, '/');
943 if (end == NULL) {
944 ALOGE("apk_path '%s' has no '/'s in it?!\n", apk_path);
945 return -1;
946 }
947 const char *apk_end = apk_path + (end - in_odex_path); // strrchr(apk_path, '/');
948 strcpy(end + 1, instruction_set); // in_odex_path now is /system/framework/<isa>\0
949 strcat(in_odex_path, apk_end);
950 end = strrchr(in_odex_path, '.');
951 if (end == NULL) {
952 return -1;
953 }
954 strcpy(end + 1, "odex");
955 input_file = in_odex_path;
956 } else {
957 input_file = apk_path;
958 }
959
960 memset(&input_stat, 0, sizeof(input_stat));
961 stat(input_file, &input_stat);
962
963 input_fd = open(input_file, O_RDONLY, 0);
964 if (input_fd < 0) {
965 ALOGE("installd cannot open '%s' for input during dexopt\n", input_file);
966 return -1;
967 }
968
969 unlink(out_path);
970 out_fd = open(out_path, O_RDWR | O_CREAT | O_EXCL, 0644);
971 if (out_fd < 0) {
972 ALOGE("installd cannot open '%s' for output during dexopt\n", out_path);
973 goto fail;
974 }
975 if (fchmod(out_fd,
976 S_IRUSR|S_IWUSR|S_IRGRP |
977 (is_public ? S_IROTH : 0)) < 0) {
978 ALOGE("installd cannot chmod '%s' during dexopt\n", out_path);
979 goto fail;
980 }
981 if (fchown(out_fd, AID_SYSTEM, uid) < 0) {
982 ALOGE("installd cannot chown '%s' during dexopt\n", out_path);
983 goto fail;
984 }
985
986 // Create profile file if there is a package name present.
987 if (strcmp(pkgname, "*") != 0) {
988 create_profile_file(pkgname, uid);
989 }
990
991 // Create a swap file if necessary.
992 if (!is_patchoat && ShouldUseSwapFileForDexopt()) {
993 // Make sure there really is enough space.
994 size_t out_len = strlen(out_path);
995 if (out_len + strlen(".swap") + 1 <= PKG_PATH_MAX) {
996 strcpy(swap_file_name, out_path);
997 strcpy(swap_file_name + strlen(out_path), ".swap");
998 unlink(swap_file_name);
999 swap_fd = open(swap_file_name, O_RDWR | O_CREAT | O_EXCL, 0600);
1000 if (swap_fd < 0) {
1001 // Could not create swap file. Optimistically go on and hope that we can compile
1002 // without it.
1003 ALOGE("installd could not create '%s' for swap during dexopt\n", swap_file_name);
1004 } else {
1005 // Immediately unlink. We don't really want to hit flash.
1006 unlink(swap_file_name);
1007 }
1008 } else {
1009 // Swap file path is too long. Try to run without.
1010 ALOGE("installd could not create swap file for path %s during dexopt\n", out_path);
1011 }
1012 }
1013
1014 ALOGV("DexInv: --- BEGIN '%s' ---\n", input_file);
1015
1016 pid_t pid;
1017 pid = fork();
1018 if (pid == 0) {
1019 /* child -- drop privileges before continuing */
1020 if (setgid(uid) != 0) {
1021 ALOGE("setgid(%d) failed in installd during dexopt\n", uid);
1022 exit(64);
1023 }
1024 if (setuid(uid) != 0) {
1025 ALOGE("setuid(%d) failed in installd during dexopt\n", uid);
1026 exit(65);
1027 }
1028 // drop capabilities
1029 struct __user_cap_header_struct capheader;
1030 struct __user_cap_data_struct capdata[2];
1031 memset(&capheader, 0, sizeof(capheader));
1032 memset(&capdata, 0, sizeof(capdata));
1033 capheader.version = _LINUX_CAPABILITY_VERSION_3;
1034 if (capset(&capheader, &capdata[0]) < 0) {
1035 ALOGE("capset failed: %s\n", strerror(errno));
1036 exit(66);
1037 }
1038 if (set_sched_policy(0, SP_BACKGROUND) < 0) {
1039 ALOGE("set_sched_policy failed: %s\n", strerror(errno));
1040 exit(70);
1041 }
1042 if (setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_BACKGROUND) < 0) {
1043 ALOGE("setpriority failed: %s\n", strerror(errno));
1044 exit(71);
1045 }
1046 if (flock(out_fd, LOCK_EX | LOCK_NB) != 0) {
1047 ALOGE("flock(%s) failed: %s\n", out_path, strerror(errno));
1048 exit(67);
1049 }
1050
1051 if (strncmp(persist_sys_dalvik_vm_lib, "libdvm", 6) == 0) {
1052 run_dexopt(input_fd, out_fd, input_file, out_path);
1053 } else if (strncmp(persist_sys_dalvik_vm_lib, "libart", 6) == 0) {
1054 if (is_patchoat) {
1055 run_patchoat(input_fd, out_fd, input_file, out_path, pkgname, instruction_set);
1056 } else {
1057 run_dex2oat(input_fd, out_fd, input_file, out_path, swap_fd, pkgname,
1058 instruction_set, vm_safe_mode);
1059 }
1060 } else {
1061 exit(69); /* Unexpected persist.sys.dalvik.vm.lib value */
1062 }
1063 exit(68); /* only get here on exec failure */
1064 } else {
1065 res = wait_child(pid);
1066 if (res == 0) {
1067 ALOGV("DexInv: --- END '%s' (success) ---\n", input_file);
1068 } else {
1069 ALOGE("DexInv: --- END '%s' --- status=0x%04x, process failed\n", input_file, res);
1070 goto fail;
1071 }
1072 }
1073
1074 ut.actime = input_stat.st_atime;
1075 ut.modtime = input_stat.st_mtime;
1076 utime(out_path, &ut);
1077
1078 close(out_fd);
1079 close(input_fd);
1080 if (swap_fd != -1) {
1081 close(swap_fd);
1082 }
1083 return 0;
1084
1085 fail:
1086 if (out_fd >= 0) {
1087 close(out_fd);
1088 unlink(out_path);
1089 }
1090 if (input_fd >= 0) {
1091 close(input_fd);
1092 }
1093 return -1;
1094 }
1095
mark_boot_complete(const char * instruction_set)1096 int mark_boot_complete(const char* instruction_set)
1097 {
1098 char boot_marker_path[PKG_PATH_MAX];
1099 sprintf(boot_marker_path,"%s%s/.booting", DALVIK_CACHE_PREFIX, instruction_set);
1100
1101 ALOGV("mark_boot_complete : %s", boot_marker_path);
1102 if (unlink(boot_marker_path) != 0) {
1103 ALOGE("Unable to unlink boot marker at %s, error=%s", boot_marker_path,
1104 strerror(errno));
1105 return -1;
1106 }
1107
1108 return 0;
1109 }
1110
mkinnerdirs(char * path,int basepos,mode_t mode,int uid,int gid,struct stat * statbuf)1111 void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
1112 struct stat* statbuf)
1113 {
1114 while (path[basepos] != 0) {
1115 if (path[basepos] == '/') {
1116 path[basepos] = 0;
1117 if (lstat(path, statbuf) < 0) {
1118 ALOGV("Making directory: %s\n", path);
1119 if (mkdir(path, mode) == 0) {
1120 chown(path, uid, gid);
1121 } else {
1122 ALOGW("Unable to make directory %s: %s\n", path, strerror(errno));
1123 }
1124 }
1125 path[basepos] = '/';
1126 basepos++;
1127 }
1128 basepos++;
1129 }
1130 }
1131
movefileordir(char * srcpath,char * dstpath,int dstbasepos,int dstuid,int dstgid,struct stat * statbuf)1132 int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
1133 int dstuid, int dstgid, struct stat* statbuf)
1134 {
1135 DIR *d;
1136 struct dirent *de;
1137 int res;
1138
1139 int srcend = strlen(srcpath);
1140 int dstend = strlen(dstpath);
1141
1142 if (lstat(srcpath, statbuf) < 0) {
1143 ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
1144 return 1;
1145 }
1146
1147 if ((statbuf->st_mode&S_IFDIR) == 0) {
1148 mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
1149 dstuid, dstgid, statbuf);
1150 ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
1151 if (rename(srcpath, dstpath) >= 0) {
1152 if (chown(dstpath, dstuid, dstgid) < 0) {
1153 ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
1154 unlink(dstpath);
1155 return 1;
1156 }
1157 } else {
1158 ALOGW("Unable to rename %s to %s: %s\n",
1159 srcpath, dstpath, strerror(errno));
1160 return 1;
1161 }
1162 return 0;
1163 }
1164
1165 d = opendir(srcpath);
1166 if (d == NULL) {
1167 ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
1168 return 1;
1169 }
1170
1171 res = 0;
1172
1173 while ((de = readdir(d))) {
1174 const char *name = de->d_name;
1175 /* always skip "." and ".." */
1176 if (name[0] == '.') {
1177 if (name[1] == 0) continue;
1178 if ((name[1] == '.') && (name[2] == 0)) continue;
1179 }
1180
1181 if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
1182 ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
1183 continue;
1184 }
1185
1186 if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
1187 ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
1188 continue;
1189 }
1190
1191 srcpath[srcend] = dstpath[dstend] = '/';
1192 strcpy(srcpath+srcend+1, name);
1193 strcpy(dstpath+dstend+1, name);
1194
1195 if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
1196 res = 1;
1197 }
1198
1199 // Note: we will be leaving empty directories behind in srcpath,
1200 // but that is okay, the package manager will be erasing all of the
1201 // data associated with .apks that disappear.
1202
1203 srcpath[srcend] = dstpath[dstend] = 0;
1204 }
1205
1206 closedir(d);
1207 return res;
1208 }
1209
movefiles()1210 int movefiles()
1211 {
1212 DIR *d;
1213 int dfd, subfd;
1214 struct dirent *de;
1215 struct stat s;
1216 char buf[PKG_PATH_MAX+1];
1217 int bufp, bufe, bufi, readlen;
1218
1219 char srcpkg[PKG_NAME_MAX];
1220 char dstpkg[PKG_NAME_MAX];
1221 char srcpath[PKG_PATH_MAX];
1222 char dstpath[PKG_PATH_MAX];
1223 int dstuid=-1, dstgid=-1;
1224 int hasspace;
1225
1226 d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
1227 if (d == NULL) {
1228 goto done;
1229 }
1230 dfd = dirfd(d);
1231
1232 /* Iterate through all files in the directory, executing the
1233 * file movements requested there-in.
1234 */
1235 while ((de = readdir(d))) {
1236 const char *name = de->d_name;
1237
1238 if (de->d_type == DT_DIR) {
1239 continue;
1240 } else {
1241 subfd = openat(dfd, name, O_RDONLY);
1242 if (subfd < 0) {
1243 ALOGW("Unable to open update commands at %s%s\n",
1244 UPDATE_COMMANDS_DIR_PREFIX, name);
1245 continue;
1246 }
1247
1248 bufp = 0;
1249 bufe = 0;
1250 buf[PKG_PATH_MAX] = 0;
1251 srcpkg[0] = dstpkg[0] = 0;
1252 while (1) {
1253 bufi = bufp;
1254 while (bufi < bufe && buf[bufi] != '\n') {
1255 bufi++;
1256 }
1257 if (bufi < bufe) {
1258 buf[bufi] = 0;
1259 ALOGV("Processing line: %s\n", buf+bufp);
1260 hasspace = 0;
1261 while (bufp < bufi && isspace(buf[bufp])) {
1262 hasspace = 1;
1263 bufp++;
1264 }
1265 if (buf[bufp] == '#' || bufp == bufi) {
1266 // skip comments and empty lines.
1267 } else if (hasspace) {
1268 if (dstpkg[0] == 0) {
1269 ALOGW("Path before package line in %s%s: %s\n",
1270 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
1271 } else if (srcpkg[0] == 0) {
1272 // Skip -- source package no longer exists.
1273 } else {
1274 ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
1275 if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
1276 !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
1277 movefileordir(srcpath, dstpath,
1278 strlen(dstpath)-strlen(buf+bufp),
1279 dstuid, dstgid, &s);
1280 }
1281 }
1282 } else {
1283 char* div = strchr(buf+bufp, ':');
1284 if (div == NULL) {
1285 ALOGW("Bad package spec in %s%s; no ':' sep: %s\n",
1286 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
1287 } else {
1288 *div = 0;
1289 div++;
1290 if (strlen(buf+bufp) < PKG_NAME_MAX) {
1291 strcpy(dstpkg, buf+bufp);
1292 } else {
1293 srcpkg[0] = dstpkg[0] = 0;
1294 ALOGW("Package name too long in %s%s: %s\n",
1295 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
1296 }
1297 if (strlen(div) < PKG_NAME_MAX) {
1298 strcpy(srcpkg, div);
1299 } else {
1300 srcpkg[0] = dstpkg[0] = 0;
1301 ALOGW("Package name too long in %s%s: %s\n",
1302 UPDATE_COMMANDS_DIR_PREFIX, name, div);
1303 }
1304 if (srcpkg[0] != 0) {
1305 if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
1306 if (lstat(srcpath, &s) < 0) {
1307 // Package no longer exists -- skip.
1308 srcpkg[0] = 0;
1309 }
1310 } else {
1311 srcpkg[0] = 0;
1312 ALOGW("Can't create path %s in %s%s\n",
1313 div, UPDATE_COMMANDS_DIR_PREFIX, name);
1314 }
1315 if (srcpkg[0] != 0) {
1316 if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
1317 if (lstat(dstpath, &s) == 0) {
1318 dstuid = s.st_uid;
1319 dstgid = s.st_gid;
1320 } else {
1321 // Destination package doesn't
1322 // exist... due to original-package,
1323 // this is normal, so don't be
1324 // noisy about it.
1325 srcpkg[0] = 0;
1326 }
1327 } else {
1328 srcpkg[0] = 0;
1329 ALOGW("Can't create path %s in %s%s\n",
1330 div, UPDATE_COMMANDS_DIR_PREFIX, name);
1331 }
1332 }
1333 ALOGV("Transfering from %s to %s: uid=%d\n",
1334 srcpkg, dstpkg, dstuid);
1335 }
1336 }
1337 }
1338 bufp = bufi+1;
1339 } else {
1340 if (bufp == 0) {
1341 if (bufp < bufe) {
1342 ALOGW("Line too long in %s%s, skipping: %s\n",
1343 UPDATE_COMMANDS_DIR_PREFIX, name, buf);
1344 }
1345 } else if (bufp < bufe) {
1346 memcpy(buf, buf+bufp, bufe-bufp);
1347 bufe -= bufp;
1348 bufp = 0;
1349 }
1350 readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
1351 if (readlen < 0) {
1352 ALOGW("Failure reading update commands in %s%s: %s\n",
1353 UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
1354 break;
1355 } else if (readlen == 0) {
1356 break;
1357 }
1358 bufe += readlen;
1359 buf[bufe] = 0;
1360 ALOGV("Read buf: %s\n", buf);
1361 }
1362 }
1363 close(subfd);
1364 }
1365 }
1366 closedir(d);
1367 done:
1368 return 0;
1369 }
1370
linklib(const char * pkgname,const char * asecLibDir,int userId)1371 int linklib(const char* pkgname, const char* asecLibDir, int userId)
1372 {
1373 char pkgdir[PKG_PATH_MAX];
1374 char libsymlink[PKG_PATH_MAX];
1375 struct stat s, libStat;
1376 int rc = 0;
1377
1378 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userId)) {
1379 ALOGE("cannot create package path\n");
1380 return -1;
1381 }
1382 if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, userId)) {
1383 ALOGE("cannot create package lib symlink origin path\n");
1384 return -1;
1385 }
1386
1387 if (stat(pkgdir, &s) < 0) return -1;
1388
1389 if (chown(pkgdir, AID_INSTALL, AID_INSTALL) < 0) {
1390 ALOGE("failed to chown '%s': %s\n", pkgdir, strerror(errno));
1391 return -1;
1392 }
1393
1394 if (chmod(pkgdir, 0700) < 0) {
1395 ALOGE("linklib() 1: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1396 rc = -1;
1397 goto out;
1398 }
1399
1400 if (lstat(libsymlink, &libStat) < 0) {
1401 if (errno != ENOENT) {
1402 ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
1403 rc = -1;
1404 goto out;
1405 }
1406 } else {
1407 if (S_ISDIR(libStat.st_mode)) {
1408 if (delete_dir_contents(libsymlink, 1, NULL) < 0) {
1409 rc = -1;
1410 goto out;
1411 }
1412 } else if (S_ISLNK(libStat.st_mode)) {
1413 if (unlink(libsymlink) < 0) {
1414 ALOGE("couldn't unlink lib dir: %s\n", strerror(errno));
1415 rc = -1;
1416 goto out;
1417 }
1418 }
1419 }
1420
1421 if (symlink(asecLibDir, libsymlink) < 0) {
1422 ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, asecLibDir,
1423 strerror(errno));
1424 rc = -errno;
1425 goto out;
1426 }
1427
1428 out:
1429 if (chmod(pkgdir, s.st_mode) < 0) {
1430 ALOGE("linklib() 2: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1431 rc = -errno;
1432 }
1433
1434 if (chown(pkgdir, s.st_uid, s.st_gid) < 0) {
1435 ALOGE("failed to chown '%s' : %s\n", pkgdir, strerror(errno));
1436 return -errno;
1437 }
1438
1439 return rc;
1440 }
1441
run_idmap(const char * target_apk,const char * overlay_apk,int idmap_fd)1442 static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd)
1443 {
1444 static const char *IDMAP_BIN = "/system/bin/idmap";
1445 static const size_t MAX_INT_LEN = 32;
1446 char idmap_str[MAX_INT_LEN];
1447
1448 snprintf(idmap_str, sizeof(idmap_str), "%d", idmap_fd);
1449
1450 execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, idmap_str, (char*)NULL);
1451 ALOGE("execl(%s) failed: %s\n", IDMAP_BIN, strerror(errno));
1452 }
1453
1454 // Transform string /a/b/c.apk to (prefix)/a@b@c.apk@(suffix)
1455 // eg /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap
flatten_path(const char * prefix,const char * suffix,const char * overlay_path,char * idmap_path,size_t N)1456 static int flatten_path(const char *prefix, const char *suffix,
1457 const char *overlay_path, char *idmap_path, size_t N)
1458 {
1459 if (overlay_path == NULL || idmap_path == NULL) {
1460 return -1;
1461 }
1462 const size_t len_overlay_path = strlen(overlay_path);
1463 // will access overlay_path + 1 further below; requires absolute path
1464 if (len_overlay_path < 2 || *overlay_path != '/') {
1465 return -1;
1466 }
1467 const size_t len_idmap_root = strlen(prefix);
1468 const size_t len_suffix = strlen(suffix);
1469 if (SIZE_MAX - len_idmap_root < len_overlay_path ||
1470 SIZE_MAX - (len_idmap_root + len_overlay_path) < len_suffix) {
1471 // additions below would cause overflow
1472 return -1;
1473 }
1474 if (N < len_idmap_root + len_overlay_path + len_suffix) {
1475 return -1;
1476 }
1477 memset(idmap_path, 0, N);
1478 snprintf(idmap_path, N, "%s%s%s", prefix, overlay_path + 1, suffix);
1479 char *ch = idmap_path + len_idmap_root;
1480 while (*ch != '\0') {
1481 if (*ch == '/') {
1482 *ch = '@';
1483 }
1484 ++ch;
1485 }
1486 return 0;
1487 }
1488
idmap(const char * target_apk,const char * overlay_apk,uid_t uid)1489 int idmap(const char *target_apk, const char *overlay_apk, uid_t uid)
1490 {
1491 ALOGV("idmap target_apk=%s overlay_apk=%s uid=%d\n", target_apk, overlay_apk, uid);
1492
1493 int idmap_fd = -1;
1494 char idmap_path[PATH_MAX];
1495
1496 if (flatten_path(IDMAP_PREFIX, IDMAP_SUFFIX, overlay_apk,
1497 idmap_path, sizeof(idmap_path)) == -1) {
1498 ALOGE("idmap cannot generate idmap path for overlay %s\n", overlay_apk);
1499 goto fail;
1500 }
1501
1502 unlink(idmap_path);
1503 idmap_fd = open(idmap_path, O_RDWR | O_CREAT | O_EXCL, 0644);
1504 if (idmap_fd < 0) {
1505 ALOGE("idmap cannot open '%s' for output: %s\n", idmap_path, strerror(errno));
1506 goto fail;
1507 }
1508 if (fchown(idmap_fd, AID_SYSTEM, uid) < 0) {
1509 ALOGE("idmap cannot chown '%s'\n", idmap_path);
1510 goto fail;
1511 }
1512 if (fchmod(idmap_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0) {
1513 ALOGE("idmap cannot chmod '%s'\n", idmap_path);
1514 goto fail;
1515 }
1516
1517 pid_t pid;
1518 pid = fork();
1519 if (pid == 0) {
1520 /* child -- drop privileges before continuing */
1521 if (setgid(uid) != 0) {
1522 ALOGE("setgid(%d) failed during idmap\n", uid);
1523 exit(1);
1524 }
1525 if (setuid(uid) != 0) {
1526 ALOGE("setuid(%d) failed during idmap\n", uid);
1527 exit(1);
1528 }
1529 if (flock(idmap_fd, LOCK_EX | LOCK_NB) != 0) {
1530 ALOGE("flock(%s) failed during idmap: %s\n", idmap_path, strerror(errno));
1531 exit(1);
1532 }
1533
1534 run_idmap(target_apk, overlay_apk, idmap_fd);
1535 exit(1); /* only if exec call to idmap failed */
1536 } else {
1537 int status = wait_child(pid);
1538 if (status != 0) {
1539 ALOGE("idmap failed, status=0x%04x\n", status);
1540 goto fail;
1541 }
1542 }
1543
1544 close(idmap_fd);
1545 return 0;
1546 fail:
1547 if (idmap_fd >= 0) {
1548 close(idmap_fd);
1549 unlink(idmap_path);
1550 }
1551 return -1;
1552 }
1553
restorecon_data(const char * pkgName,const char * seinfo,uid_t uid)1554 int restorecon_data(const char* pkgName, const char* seinfo, uid_t uid)
1555 {
1556 struct dirent *entry;
1557 DIR *d;
1558 struct stat s;
1559 char *userdir;
1560 char *primarydir;
1561 char *pkgdir;
1562 int ret = 0;
1563
1564 // SELINUX_ANDROID_RESTORECON_DATADATA flag is set by libselinux. Not needed here.
1565 unsigned int flags = SELINUX_ANDROID_RESTORECON_RECURSE;
1566
1567 if (!pkgName || !seinfo) {
1568 ALOGE("Package name or seinfo tag is null when trying to restorecon.");
1569 return -1;
1570 }
1571
1572 if (asprintf(&primarydir, "%s%s%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgName) < 0) {
1573 return -1;
1574 }
1575
1576 // Relabel for primary user.
1577 if (selinux_android_restorecon_pkgdir(primarydir, seinfo, uid, flags) < 0) {
1578 ALOGE("restorecon failed for %s: %s\n", primarydir, strerror(errno));
1579 ret |= -1;
1580 }
1581
1582 if (asprintf(&userdir, "%s%s", android_data_dir.path, SECONDARY_USER_PREFIX) < 0) {
1583 free(primarydir);
1584 return -1;
1585 }
1586
1587 // Relabel package directory for all secondary users.
1588 d = opendir(userdir);
1589 if (d == NULL) {
1590 free(primarydir);
1591 free(userdir);
1592 return -1;
1593 }
1594
1595 while ((entry = readdir(d))) {
1596 if (entry->d_type != DT_DIR) {
1597 continue;
1598 }
1599
1600 const char *user = entry->d_name;
1601 // Ignore "." and ".."
1602 if (!strcmp(user, ".") || !strcmp(user, "..")) {
1603 continue;
1604 }
1605
1606 // user directories start with a number
1607 if (user[0] < '0' || user[0] > '9') {
1608 ALOGE("Expecting numbered directory during restorecon. Instead got '%s'.", user);
1609 continue;
1610 }
1611
1612 if (asprintf(&pkgdir, "%s%s/%s", userdir, user, pkgName) < 0) {
1613 continue;
1614 }
1615
1616 if (stat(pkgdir, &s) < 0) {
1617 free(pkgdir);
1618 continue;
1619 }
1620
1621 if (selinux_android_restorecon_pkgdir(pkgdir, seinfo, uid, flags) < 0) {
1622 ALOGE("restorecon failed for %s: %s\n", pkgdir, strerror(errno));
1623 ret |= -1;
1624 }
1625 free(pkgdir);
1626 }
1627
1628 closedir(d);
1629 free(primarydir);
1630 free(userdir);
1631 return ret;
1632 }
1633
1634