commands.c revision 2044ac43e53b517526b3c70dc4fbc60ffc01693f 
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 <sys/capability.h>
18#include "installd.h"
19#include <diskusage/dirsize.h>
20#include <selinux/android.h>
21
22/* Directory records that are used in execution of commands. */
23dir_rec_t android_data_dir;
24dir_rec_t android_asec_dir;
25dir_rec_t android_app_dir;
26dir_rec_t android_app_private_dir;
27dir_rec_t android_app_lib_dir;
28dir_rec_t android_media_dir;
29dir_rec_array_t android_system_dirs;
30
31int install(const char *pkgname, uid_t uid, gid_t gid, const char *seinfo)
32{
33    char pkgdir[PKG_PATH_MAX];
34    char libsymlink[PKG_PATH_MAX];
35    char applibdir[PKG_PATH_MAX];
36    struct stat libStat;
37
38    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
39        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
40        return -1;
41    }
42
43    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
44        ALOGE("cannot create package path\n");
45        return -1;
46    }
47
48    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, 0)) {
49        ALOGE("cannot create package lib symlink origin path\n");
50        return -1;
51    }
52
53    if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
54        ALOGE("cannot create package lib symlink dest path\n");
55        return -1;
56    }
57
58    if (mkdir(pkgdir, 0751) < 0) {
59        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
60        return -1;
61    }
62    if (chmod(pkgdir, 0751) < 0) {
63        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
64        unlink(pkgdir);
65        return -1;
66    }
67
68    if (lstat(libsymlink, &libStat) < 0) {
69        if (errno != ENOENT) {
70            ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
71            return -1;
72        }
73    } else {
74        if (S_ISDIR(libStat.st_mode)) {
75            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
76                ALOGE("couldn't delete lib directory during install for: %s", libsymlink);
77                return -1;
78            }
79        } else if (S_ISLNK(libStat.st_mode)) {
80            if (unlink(libsymlink) < 0) {
81                ALOGE("couldn't unlink lib directory during install for: %s", libsymlink);
82                return -1;
83            }
84        }
85    }
86
87    if (symlink(applibdir, libsymlink) < 0) {
88        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, applibdir,
89                strerror(errno));
90        unlink(pkgdir);
91        return -1;
92    }
93
94    if (selinux_android_setfilecon(pkgdir, pkgname, seinfo, uid) < 0) {
95        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
96        unlink(libsymlink);
97        unlink(pkgdir);
98        return -errno;
99    }
100
101    if (chown(pkgdir, uid, gid) < 0) {
102        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
103        unlink(libsymlink);
104        unlink(pkgdir);
105        return -1;
106    }
107
108    return 0;
109}
110
111int uninstall(const char *pkgname, userid_t userid)
112{
113    char pkgdir[PKG_PATH_MAX];
114
115    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid))
116        return -1;
117
118    /* delete contents AND directory, no exceptions */
119    return delete_dir_contents(pkgdir, 1, NULL);
120}
121
122int renamepkg(const char *oldpkgname, const char *newpkgname)
123{
124    char oldpkgdir[PKG_PATH_MAX];
125    char newpkgdir[PKG_PATH_MAX];
126
127    if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
128        return -1;
129    if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
130        return -1;
131
132    if (rename(oldpkgdir, newpkgdir) < 0) {
133        ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
134        return -errno;
135    }
136    return 0;
137}
138
139int fix_uid(const char *pkgname, uid_t uid, gid_t gid)
140{
141    char pkgdir[PKG_PATH_MAX];
142    struct stat s;
143    int rc = 0;
144
145    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
146        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
147        return -1;
148    }
149
150    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
151        ALOGE("cannot create package path\n");
152        return -1;
153    }
154
155    if (stat(pkgdir, &s) < 0) return -1;
156
157    if (s.st_uid != 0 || s.st_gid != 0) {
158        ALOGE("fixing uid of non-root pkg: %s %lu %lu\n", pkgdir, s.st_uid, s.st_gid);
159        return -1;
160    }
161
162    if (chmod(pkgdir, 0751) < 0) {
163        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
164        unlink(pkgdir);
165        return -errno;
166    }
167    if (chown(pkgdir, uid, gid) < 0) {
168        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
169        unlink(pkgdir);
170        return -errno;
171    }
172
173    return 0;
174}
175
176int delete_user_data(const char *pkgname, userid_t userid)
177{
178    char pkgdir[PKG_PATH_MAX];
179
180    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid))
181        return -1;
182
183    /* delete contents, excluding "lib", but not the directory itself */
184    return delete_dir_contents(pkgdir, 0, "lib");
185}
186
187int make_user_data(const char *pkgname, uid_t uid, userid_t userid, const char* seinfo)
188{
189    char pkgdir[PKG_PATH_MAX];
190    char applibdir[PKG_PATH_MAX];
191    char libsymlink[PKG_PATH_MAX];
192    struct stat libStat;
193
194    // Create the data dir for the package
195    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userid)) {
196        return -1;
197    }
198    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, userid)) {
199        ALOGE("cannot create package lib symlink origin path\n");
200        return -1;
201    }
202    if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
203        ALOGE("cannot create package lib symlink dest path\n");
204        return -1;
205    }
206
207    if (mkdir(pkgdir, 0751) < 0) {
208        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
209        return -errno;
210    }
211    if (chmod(pkgdir, 0751) < 0) {
212        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
213        unlink(pkgdir);
214        return -errno;
215    }
216
217    if (lstat(libsymlink, &libStat) < 0) {
218        if (errno != ENOENT) {
219            ALOGE("couldn't stat lib dir for non-primary: %s\n", strerror(errno));
220            unlink(pkgdir);
221            return -1;
222        }
223    } else {
224        if (S_ISDIR(libStat.st_mode)) {
225            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
226                ALOGE("couldn't delete lib directory during install for non-primary: %s",
227                        libsymlink);
228                unlink(pkgdir);
229                return -1;
230            }
231        } else if (S_ISLNK(libStat.st_mode)) {
232            if (unlink(libsymlink) < 0) {
233                ALOGE("couldn't unlink lib directory during install for non-primary: %s",
234                        libsymlink);
235                unlink(pkgdir);
236                return -1;
237            }
238        }
239    }
240
241    if (symlink(applibdir, libsymlink) < 0) {
242        ALOGE("couldn't symlink directory for non-primary '%s' -> '%s': %s\n", libsymlink,
243                applibdir, strerror(errno));
244        unlink(pkgdir);
245        return -1;
246    }
247
248    if (selinux_android_setfilecon(pkgdir, pkgname, seinfo, uid) < 0) {
249        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
250        unlink(libsymlink);
251        unlink(pkgdir);
252        return -errno;
253    }
254
255    if (chown(pkgdir, uid, uid) < 0) {
256        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
257        unlink(libsymlink);
258        unlink(pkgdir);
259        return -errno;
260    }
261
262    return 0;
263}
264
265int delete_user(userid_t userid)
266{
267    char data_path[PKG_PATH_MAX];
268    if (create_user_path(data_path, userid)) {
269        return -1;
270    }
271    if (delete_dir_contents(data_path, 1, NULL)) {
272        return -1;
273    }
274
275    char media_path[PATH_MAX];
276    if (create_user_media_path(media_path, userid) == -1) {
277        return -1;
278    }
279    if (delete_dir_contents(media_path, 1, NULL) == -1) {
280        return -1;
281    }
282
283    return 0;
284}
285
286int delete_cache(const char *pkgname, userid_t userid)
287{
288    char cachedir[PKG_PATH_MAX];
289
290    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, userid))
291        return -1;
292
293        /* delete contents, not the directory, no exceptions */
294    return delete_dir_contents(cachedir, 0, 0);
295}
296
297/* Try to ensure free_size bytes of storage are available.
298 * Returns 0 on success.
299 * This is rather simple-minded because doing a full LRU would
300 * be potentially memory-intensive, and without atime it would
301 * also require that apps constantly modify file metadata even
302 * when just reading from the cache, which is pretty awful.
303 */
304int free_cache(int64_t free_size)
305{
306    cache_t* cache;
307    int64_t avail;
308    DIR *d;
309    struct dirent *de;
310    char tmpdir[PATH_MAX];
311    char *dirpos;
312
313    avail = data_disk_free();
314    if (avail < 0) return -1;
315
316    ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
317    if (avail >= free_size) return 0;
318
319    cache = start_cache_collection();
320
321    // Collect cache files for primary user.
322    if (create_user_path(tmpdir, 0) == 0) {
323        //ALOGI("adding cache files from %s\n", tmpdir);
324        add_cache_files(cache, tmpdir, "cache");
325    }
326
327    // Search for other users and add any cache files from them.
328    snprintf(tmpdir, sizeof(tmpdir), "%s%s", android_data_dir.path,
329            SECONDARY_USER_PREFIX);
330    dirpos = tmpdir + strlen(tmpdir);
331    d = opendir(tmpdir);
332    if (d != NULL) {
333        while ((de = readdir(d))) {
334            if (de->d_type == DT_DIR) {
335                const char *name = de->d_name;
336                    /* always skip "." and ".." */
337                if (name[0] == '.') {
338                    if (name[1] == 0) continue;
339                    if ((name[1] == '.') && (name[2] == 0)) continue;
340                }
341                if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
342                    strcpy(dirpos, name);
343                    //ALOGI("adding cache files from %s\n", tmpdir);
344                    add_cache_files(cache, tmpdir, "cache");
345                } else {
346                    ALOGW("Path exceeds limit: %s%s", tmpdir, name);
347                }
348            }
349        }
350        closedir(d);
351    }
352
353    // Collect cache files on external storage for all users (if it is mounted as part
354    // of the internal storage).
355    strcpy(tmpdir, android_media_dir.path);
356    dirpos = tmpdir + strlen(tmpdir);
357    d = opendir(tmpdir);
358    if (d != NULL) {
359        while ((de = readdir(d))) {
360            if (de->d_type == DT_DIR) {
361                const char *name = de->d_name;
362                    /* skip any dir that doesn't start with a number, so not a user */
363                if (name[0] < '0' || name[0] > '9') {
364                    continue;
365                }
366                if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
367                    strcpy(dirpos, name);
368                    if (lookup_media_dir(tmpdir, "Android") == 0
369                            && lookup_media_dir(tmpdir, "data") == 0) {
370                        //ALOGI("adding cache files from %s\n", tmpdir);
371                        add_cache_files(cache, tmpdir, "cache");
372                    }
373                } else {
374                    ALOGW("Path exceeds limit: %s%s", tmpdir, name);
375                }
376            }
377        }
378        closedir(d);
379    }
380
381    clear_cache_files(cache, free_size);
382    finish_cache_collection(cache);
383
384    return data_disk_free() >= free_size ? 0 : -1;
385}
386
387int move_dex(const char *src, const char *dst)
388{
389    char src_dex[PKG_PATH_MAX];
390    char dst_dex[PKG_PATH_MAX];
391
392    if (validate_apk_path(src)) return -1;
393    if (validate_apk_path(dst)) return -1;
394
395    if (create_cache_path(src_dex, src)) return -1;
396    if (create_cache_path(dst_dex, dst)) return -1;
397
398    ALOGV("move %s -> %s\n", src_dex, dst_dex);
399    if (rename(src_dex, dst_dex) < 0) {
400        ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
401        return -1;
402    } else {
403        return 0;
404    }
405}
406
407int rm_dex(const char *path)
408{
409    char dex_path[PKG_PATH_MAX];
410
411    if (validate_apk_path(path)) return -1;
412    if (create_cache_path(dex_path, path)) return -1;
413
414    ALOGV("unlink %s\n", dex_path);
415    if (unlink(dex_path) < 0) {
416        ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
417        return -1;
418    } else {
419        return 0;
420    }
421}
422
423int get_size(const char *pkgname, userid_t userid, const char *apkpath,
424             const char *libdirpath, const char *fwdlock_apkpath, const char *asecpath,
425             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
426             int64_t* _asecsize)
427{
428    DIR *d;
429    int dfd;
430    struct dirent *de;
431    struct stat s;
432    char path[PKG_PATH_MAX];
433
434    int64_t codesize = 0;
435    int64_t datasize = 0;
436    int64_t cachesize = 0;
437    int64_t asecsize = 0;
438
439        /* count the source apk as code -- but only if it's not
440         * on the /system partition and its not on the sdcard.
441         */
442    if (validate_system_app_path(apkpath) &&
443            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
444        if (stat(apkpath, &s) == 0) {
445            codesize += stat_size(&s);
446        }
447    }
448        /* count the forward locked apk as code if it is given
449         */
450    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
451        if (stat(fwdlock_apkpath, &s) == 0) {
452            codesize += stat_size(&s);
453        }
454    }
455        /* count the cached dexfile as code */
456    if (!create_cache_path(path, apkpath)) {
457        if (stat(path, &s) == 0) {
458            codesize += stat_size(&s);
459        }
460    }
461
462        /* add in size of any libraries */
463    if (libdirpath != NULL && libdirpath[0] != '!') {
464        d = opendir(libdirpath);
465        if (d != NULL) {
466            dfd = dirfd(d);
467            codesize += calculate_dir_size(dfd);
468            closedir(d);
469        }
470    }
471
472        /* compute asec size if it is given
473         */
474    if (asecpath != NULL && asecpath[0] != '!') {
475        if (stat(asecpath, &s) == 0) {
476            asecsize += stat_size(&s);
477        }
478    }
479
480    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, userid)) {
481        goto done;
482    }
483
484    d = opendir(path);
485    if (d == NULL) {
486        goto done;
487    }
488    dfd = dirfd(d);
489
490    /* most stuff in the pkgdir is data, except for the "cache"
491     * directory and below, which is cache, and the "lib" directory
492     * and below, which is code...
493     */
494    while ((de = readdir(d))) {
495        const char *name = de->d_name;
496
497        if (de->d_type == DT_DIR) {
498            int subfd;
499            int64_t statsize = 0;
500            int64_t dirsize = 0;
501                /* always skip "." and ".." */
502            if (name[0] == '.') {
503                if (name[1] == 0) continue;
504                if ((name[1] == '.') && (name[2] == 0)) continue;
505            }
506            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
507                statsize = stat_size(&s);
508            }
509            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
510            if (subfd >= 0) {
511                dirsize = calculate_dir_size(subfd);
512            }
513            if(!strcmp(name,"lib")) {
514                codesize += dirsize + statsize;
515            } else if(!strcmp(name,"cache")) {
516                cachesize += dirsize + statsize;
517            } else {
518                datasize += dirsize + statsize;
519            }
520        } else if (de->d_type == DT_LNK && !strcmp(name,"lib")) {
521            // This is the symbolic link to the application's library
522            // code.  We'll count this as code instead of data, since
523            // it is not something that the app creates.
524            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
525                codesize += stat_size(&s);
526            }
527        } else {
528            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
529                datasize += stat_size(&s);
530            }
531        }
532    }
533    closedir(d);
534done:
535    *_codesize = codesize;
536    *_datasize = datasize;
537    *_cachesize = cachesize;
538    *_asecsize = asecsize;
539    return 0;
540}
541
542
543int create_cache_path(char path[PKG_PATH_MAX], const char *src)
544{
545    char *tmp;
546    int srclen;
547    int dstlen;
548
549    srclen = strlen(src);
550
551        /* demand that we are an absolute path */
552    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
553        return -1;
554    }
555
556    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
557        return -1;
558    }
559
560    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
561        strlen(DALVIK_CACHE_POSTFIX) + 1;
562
563    if (dstlen > PKG_PATH_MAX) {
564        return -1;
565    }
566
567    sprintf(path,"%s%s%s",
568            DALVIK_CACHE_PREFIX,
569            src + 1, /* skip the leading / */
570            DALVIK_CACHE_POSTFIX);
571
572    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
573        if (*tmp == '/') {
574            *tmp = '@';
575        }
576    }
577
578    return 0;
579}
580
581static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
582    const char* output_file_name, const char* dexopt_flags)
583{
584    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
585    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
586    char zip_num[MAX_INT_LEN];
587    char odex_num[MAX_INT_LEN];
588
589    sprintf(zip_num, "%d", zip_fd);
590    sprintf(odex_num, "%d", odex_fd);
591
592    ALOGV("Running %s in=%s out=%s\n", DEX_OPT_BIN, input_file_name, output_file_name);
593    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
594        dexopt_flags, (char*) NULL);
595    ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
596}
597
598static void run_dex2oat(int zip_fd, int oat_fd, const char* input_file_name,
599    const char* output_file_name, const char* dexopt_flags)
600{
601    static const char* DEX2OAT_BIN = "/system/bin/dex2oat";
602    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
603    char zip_fd_arg[strlen("--zip-fd=") + MAX_INT_LEN];
604    char zip_location_arg[strlen("--zip-location=") + PKG_PATH_MAX];
605    char oat_fd_arg[strlen("--oat-fd=") + MAX_INT_LEN];
606    char oat_location_arg[strlen("--oat-name=") + PKG_PATH_MAX];
607
608    sprintf(zip_fd_arg, "--zip-fd=%d", zip_fd);
609    sprintf(zip_location_arg, "--zip-location=%s", input_file_name);
610    sprintf(oat_fd_arg, "--oat-fd=%d", oat_fd);
611    sprintf(oat_location_arg, "--oat-location=%s", output_file_name);
612
613    ALOGV("Running %s in=%s out=%s\n", DEX2OAT_BIN, input_file_name, output_file_name);
614    execl(DEX2OAT_BIN, DEX2OAT_BIN,
615          zip_fd_arg, zip_location_arg,
616          oat_fd_arg, oat_location_arg,
617          (char*) NULL);
618    ALOGE("execl(%s) failed: %s\n", DEX2OAT_BIN, strerror(errno));
619}
620
621static int wait_child(pid_t pid)
622{
623    int status;
624    pid_t got_pid;
625
626    while (1) {
627        got_pid = waitpid(pid, &status, 0);
628        if (got_pid == -1 && errno == EINTR) {
629            printf("waitpid interrupted, retrying\n");
630        } else {
631            break;
632        }
633    }
634    if (got_pid != pid) {
635        ALOGW("waitpid failed: wanted %d, got %d: %s\n",
636            (int) pid, (int) got_pid, strerror(errno));
637        return 1;
638    }
639
640    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
641        return 0;
642    } else {
643        return status;      /* always nonzero */
644    }
645}
646
647int dexopt(const char *apk_path, uid_t uid, int is_public)
648{
649    struct utimbuf ut;
650    struct stat apk_stat, dex_stat;
651    char out_path[PKG_PATH_MAX];
652    char dexopt_flags[PROPERTY_VALUE_MAX];
653    char persist_sys_dalvik_vm_lib[PROPERTY_VALUE_MAX];
654    char *end;
655    int res, zip_fd=-1, out_fd=-1;
656
657    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
658        return -1;
659    }
660
661    /* platform-specific flags affecting optimization and verification */
662    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
663    ALOGV("dalvik.vm.dexopt_flags=%s\n", dexopt_flags);
664
665    /* The command to run depend ones the value of persist.sys.dalvik.vm.lib */
666    property_get("persist.sys.dalvik.vm.lib.1", persist_sys_dalvik_vm_lib, "libdvm.so");
667
668    /* Before anything else: is there a .odex file?  If so, we have
669     * precompiled the apk and there is nothing to do here.
670     */
671    sprintf(out_path, "%s%s", apk_path, ".odex");
672    if (stat(out_path, &dex_stat) == 0) {
673        return 0;
674    }
675
676    if (create_cache_path(out_path, apk_path)) {
677        return -1;
678    }
679
680    memset(&apk_stat, 0, sizeof(apk_stat));
681    stat(apk_path, &apk_stat);
682
683    zip_fd = open(apk_path, O_RDONLY, 0);
684    if (zip_fd < 0) {
685        ALOGE("installd cannot open '%s' for input during dexopt\n", apk_path);
686        return -1;
687    }
688
689    unlink(out_path);
690    out_fd = open(out_path, O_RDWR | O_CREAT | O_EXCL, 0644);
691    if (out_fd < 0) {
692        ALOGE("installd cannot open '%s' for output during dexopt\n", out_path);
693        goto fail;
694    }
695    if (fchmod(out_fd,
696               S_IRUSR|S_IWUSR|S_IRGRP |
697               (is_public ? S_IROTH : 0)) < 0) {
698        ALOGE("installd cannot chmod '%s' during dexopt\n", out_path);
699        goto fail;
700    }
701    if (fchown(out_fd, AID_SYSTEM, uid) < 0) {
702        ALOGE("installd cannot chown '%s' during dexopt\n", out_path);
703        goto fail;
704    }
705
706    ALOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
707
708    pid_t pid;
709    pid = fork();
710    if (pid == 0) {
711        /* child -- drop privileges before continuing */
712        if (setgid(uid) != 0) {
713            ALOGE("setgid(%d) failed in installd during dexopt\n", uid);
714            exit(64);
715        }
716        if (setuid(uid) != 0) {
717            ALOGE("setuid(%d) failed in installd during dexopt\n", uid);
718            exit(65);
719        }
720        // drop capabilities
721        struct __user_cap_header_struct capheader;
722        struct __user_cap_data_struct capdata[2];
723        memset(&capheader, 0, sizeof(capheader));
724        memset(&capdata, 0, sizeof(capdata));
725        capheader.version = _LINUX_CAPABILITY_VERSION_3;
726        if (capset(&capheader, &capdata[0]) < 0) {
727            ALOGE("capset failed: %s\n", strerror(errno));
728            exit(66);
729        }
730        if (flock(out_fd, LOCK_EX | LOCK_NB) != 0) {
731            ALOGE("flock(%s) failed: %s\n", out_path, strerror(errno));
732            exit(67);
733        }
734
735        if (strncmp(persist_sys_dalvik_vm_lib, "libdvm", 6) == 0) {
736            run_dexopt(zip_fd, out_fd, apk_path, out_path, dexopt_flags);
737        } else if (strncmp(persist_sys_dalvik_vm_lib, "libart", 6) == 0) {
738            run_dex2oat(zip_fd, out_fd, apk_path, out_path, dexopt_flags);
739        } else {
740            exit(69);   /* Unexpected persist.sys.dalvik.vm.lib value */
741        }
742        exit(68);   /* only get here on exec failure */
743    } else {
744        res = wait_child(pid);
745        if (res == 0) {
746            ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
747        } else {
748            ALOGE("DexInv: --- END '%s' --- status=0x%04x, process failed\n", apk_path, res);
749            goto fail;
750        }
751    }
752
753    ut.actime = apk_stat.st_atime;
754    ut.modtime = apk_stat.st_mtime;
755    utime(out_path, &ut);
756
757    close(out_fd);
758    close(zip_fd);
759    return 0;
760
761fail:
762    if (out_fd >= 0) {
763        close(out_fd);
764        unlink(out_path);
765    }
766    if (zip_fd >= 0) {
767        close(zip_fd);
768    }
769    return -1;
770}
771
772void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
773        struct stat* statbuf)
774{
775    while (path[basepos] != 0) {
776        if (path[basepos] == '/') {
777            path[basepos] = 0;
778            if (lstat(path, statbuf) < 0) {
779                ALOGV("Making directory: %s\n", path);
780                if (mkdir(path, mode) == 0) {
781                    chown(path, uid, gid);
782                } else {
783                    ALOGW("Unable to make directory %s: %s\n", path, strerror(errno));
784                }
785            }
786            path[basepos] = '/';
787            basepos++;
788        }
789        basepos++;
790    }
791}
792
793int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
794        int dstuid, int dstgid, struct stat* statbuf)
795{
796    DIR *d;
797    struct dirent *de;
798    int res;
799
800    int srcend = strlen(srcpath);
801    int dstend = strlen(dstpath);
802
803    if (lstat(srcpath, statbuf) < 0) {
804        ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
805        return 1;
806    }
807
808    if ((statbuf->st_mode&S_IFDIR) == 0) {
809        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
810                dstuid, dstgid, statbuf);
811        ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
812        if (rename(srcpath, dstpath) >= 0) {
813            if (chown(dstpath, dstuid, dstgid) < 0) {
814                ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
815                unlink(dstpath);
816                return 1;
817            }
818        } else {
819            ALOGW("Unable to rename %s to %s: %s\n",
820                srcpath, dstpath, strerror(errno));
821            return 1;
822        }
823        return 0;
824    }
825
826    d = opendir(srcpath);
827    if (d == NULL) {
828        ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
829        return 1;
830    }
831
832    res = 0;
833
834    while ((de = readdir(d))) {
835        const char *name = de->d_name;
836            /* always skip "." and ".." */
837        if (name[0] == '.') {
838            if (name[1] == 0) continue;
839            if ((name[1] == '.') && (name[2] == 0)) continue;
840        }
841
842        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
843            ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
844            continue;
845        }
846
847        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
848            ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
849            continue;
850        }
851
852        srcpath[srcend] = dstpath[dstend] = '/';
853        strcpy(srcpath+srcend+1, name);
854        strcpy(dstpath+dstend+1, name);
855
856        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
857            res = 1;
858        }
859
860        // Note: we will be leaving empty directories behind in srcpath,
861        // but that is okay, the package manager will be erasing all of the
862        // data associated with .apks that disappear.
863
864        srcpath[srcend] = dstpath[dstend] = 0;
865    }
866
867    closedir(d);
868    return res;
869}
870
871int movefiles()
872{
873    DIR *d;
874    int dfd, subfd;
875    struct dirent *de;
876    struct stat s;
877    char buf[PKG_PATH_MAX+1];
878    int bufp, bufe, bufi, readlen;
879
880    char srcpkg[PKG_NAME_MAX];
881    char dstpkg[PKG_NAME_MAX];
882    char srcpath[PKG_PATH_MAX];
883    char dstpath[PKG_PATH_MAX];
884    int dstuid=-1, dstgid=-1;
885    int hasspace;
886
887    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
888    if (d == NULL) {
889        goto done;
890    }
891    dfd = dirfd(d);
892
893        /* Iterate through all files in the directory, executing the
894         * file movements requested there-in.
895         */
896    while ((de = readdir(d))) {
897        const char *name = de->d_name;
898
899        if (de->d_type == DT_DIR) {
900            continue;
901        } else {
902            subfd = openat(dfd, name, O_RDONLY);
903            if (subfd < 0) {
904                ALOGW("Unable to open update commands at %s%s\n",
905                        UPDATE_COMMANDS_DIR_PREFIX, name);
906                continue;
907            }
908
909            bufp = 0;
910            bufe = 0;
911            buf[PKG_PATH_MAX] = 0;
912            srcpkg[0] = dstpkg[0] = 0;
913            while (1) {
914                bufi = bufp;
915                while (bufi < bufe && buf[bufi] != '\n') {
916                    bufi++;
917                }
918                if (bufi < bufe) {
919                    buf[bufi] = 0;
920                    ALOGV("Processing line: %s\n", buf+bufp);
921                    hasspace = 0;
922                    while (bufp < bufi && isspace(buf[bufp])) {
923                        hasspace = 1;
924                        bufp++;
925                    }
926                    if (buf[bufp] == '#' || bufp == bufi) {
927                        // skip comments and empty lines.
928                    } else if (hasspace) {
929                        if (dstpkg[0] == 0) {
930                            ALOGW("Path before package line in %s%s: %s\n",
931                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
932                        } else if (srcpkg[0] == 0) {
933                            // Skip -- source package no longer exists.
934                        } else {
935                            ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
936                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
937                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
938                                movefileordir(srcpath, dstpath,
939                                        strlen(dstpath)-strlen(buf+bufp),
940                                        dstuid, dstgid, &s);
941                            }
942                        }
943                    } else {
944                        char* div = strchr(buf+bufp, ':');
945                        if (div == NULL) {
946                            ALOGW("Bad package spec in %s%s; no ':' sep: %s\n",
947                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
948                        } else {
949                            *div = 0;
950                            div++;
951                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
952                                strcpy(dstpkg, buf+bufp);
953                            } else {
954                                srcpkg[0] = dstpkg[0] = 0;
955                                ALOGW("Package name too long in %s%s: %s\n",
956                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
957                            }
958                            if (strlen(div) < PKG_NAME_MAX) {
959                                strcpy(srcpkg, div);
960                            } else {
961                                srcpkg[0] = dstpkg[0] = 0;
962                                ALOGW("Package name too long in %s%s: %s\n",
963                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
964                            }
965                            if (srcpkg[0] != 0) {
966                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
967                                    if (lstat(srcpath, &s) < 0) {
968                                        // Package no longer exists -- skip.
969                                        srcpkg[0] = 0;
970                                    }
971                                } else {
972                                    srcpkg[0] = 0;
973                                    ALOGW("Can't create path %s in %s%s\n",
974                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
975                                }
976                                if (srcpkg[0] != 0) {
977                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
978                                        if (lstat(dstpath, &s) == 0) {
979                                            dstuid = s.st_uid;
980                                            dstgid = s.st_gid;
981                                        } else {
982                                            // Destination package doesn't
983                                            // exist...  due to original-package,
984                                            // this is normal, so don't be
985                                            // noisy about it.
986                                            srcpkg[0] = 0;
987                                        }
988                                    } else {
989                                        srcpkg[0] = 0;
990                                        ALOGW("Can't create path %s in %s%s\n",
991                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
992                                    }
993                                }
994                                ALOGV("Transfering from %s to %s: uid=%d\n",
995                                    srcpkg, dstpkg, dstuid);
996                            }
997                        }
998                    }
999                    bufp = bufi+1;
1000                } else {
1001                    if (bufp == 0) {
1002                        if (bufp < bufe) {
1003                            ALOGW("Line too long in %s%s, skipping: %s\n",
1004                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
1005                        }
1006                    } else if (bufp < bufe) {
1007                        memcpy(buf, buf+bufp, bufe-bufp);
1008                        bufe -= bufp;
1009                        bufp = 0;
1010                    }
1011                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
1012                    if (readlen < 0) {
1013                        ALOGW("Failure reading update commands in %s%s: %s\n",
1014                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
1015                        break;
1016                    } else if (readlen == 0) {
1017                        break;
1018                    }
1019                    bufe += readlen;
1020                    buf[bufe] = 0;
1021                    ALOGV("Read buf: %s\n", buf);
1022                }
1023            }
1024            close(subfd);
1025        }
1026    }
1027    closedir(d);
1028done:
1029    return 0;
1030}
1031
1032int linklib(const char* pkgname, const char* asecLibDir, int userId)
1033{
1034    char pkgdir[PKG_PATH_MAX];
1035    char libsymlink[PKG_PATH_MAX];
1036    struct stat s, libStat;
1037    int rc = 0;
1038
1039    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userId)) {
1040        ALOGE("cannot create package path\n");
1041        return -1;
1042    }
1043    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, userId)) {
1044        ALOGE("cannot create package lib symlink origin path\n");
1045        return -1;
1046    }
1047
1048    if (stat(pkgdir, &s) < 0) return -1;
1049
1050    if (chown(pkgdir, AID_INSTALL, AID_INSTALL) < 0) {
1051        ALOGE("failed to chown '%s': %s\n", pkgdir, strerror(errno));
1052        return -1;
1053    }
1054
1055    if (chmod(pkgdir, 0700) < 0) {
1056        ALOGE("linklib() 1: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1057        rc = -1;
1058        goto out;
1059    }
1060
1061    if (lstat(libsymlink, &libStat) < 0) {
1062        if (errno != ENOENT) {
1063            ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
1064            rc = -1;
1065            goto out;
1066        }
1067    } else {
1068        if (S_ISDIR(libStat.st_mode)) {
1069            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
1070                rc = -1;
1071                goto out;
1072            }
1073        } else if (S_ISLNK(libStat.st_mode)) {
1074            if (unlink(libsymlink) < 0) {
1075                ALOGE("couldn't unlink lib dir: %s\n", strerror(errno));
1076                rc = -1;
1077                goto out;
1078            }
1079        }
1080    }
1081
1082    if (symlink(asecLibDir, libsymlink) < 0) {
1083        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, asecLibDir,
1084                strerror(errno));
1085        rc = -errno;
1086        goto out;
1087    }
1088
1089out:
1090    if (chmod(pkgdir, s.st_mode) < 0) {
1091        ALOGE("linklib() 2: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1092        rc = -errno;
1093    }
1094
1095    if (chown(pkgdir, s.st_uid, s.st_gid) < 0) {
1096        ALOGE("failed to chown '%s' : %s\n", pkgdir, strerror(errno));
1097        return -errno;
1098    }
1099
1100    return rc;
1101}
1102
1103static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd)
1104{
1105    static const char *IDMAP_BIN = "/system/bin/idmap";
1106    static const size_t MAX_INT_LEN = 32;
1107    char idmap_str[MAX_INT_LEN];
1108
1109    snprintf(idmap_str, sizeof(idmap_str), "%d", idmap_fd);
1110
1111    execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, idmap_str, (char*)NULL);
1112    ALOGE("execl(%s) failed: %s\n", IDMAP_BIN, strerror(errno));
1113}
1114
1115// Transform string /a/b/c.apk to (prefix)/a@b@c.apk@(suffix)
1116// eg /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap
1117static int flatten_path(const char *prefix, const char *suffix,
1118        const char *overlay_path, char *idmap_path, size_t N)
1119{
1120    if (overlay_path == NULL || idmap_path == NULL) {
1121        return -1;
1122    }
1123    const size_t len_overlay_path = strlen(overlay_path);
1124    // will access overlay_path + 1 further below; requires absolute path
1125    if (len_overlay_path < 2 || *overlay_path != '/') {
1126        return -1;
1127    }
1128    const size_t len_idmap_root = strlen(prefix);
1129    const size_t len_suffix = strlen(suffix);
1130    if (SIZE_MAX - len_idmap_root < len_overlay_path ||
1131            SIZE_MAX - (len_idmap_root + len_overlay_path) < len_suffix) {
1132        // additions below would cause overflow
1133        return -1;
1134    }
1135    if (N < len_idmap_root + len_overlay_path + len_suffix) {
1136        return -1;
1137    }
1138    memset(idmap_path, 0, N);
1139    snprintf(idmap_path, N, "%s%s%s", prefix, overlay_path + 1, suffix);
1140    char *ch = idmap_path + len_idmap_root;
1141    while (*ch != '\0') {
1142        if (*ch == '/') {
1143            *ch = '@';
1144        }
1145        ++ch;
1146    }
1147    return 0;
1148}
1149
1150int idmap(const char *target_apk, const char *overlay_apk, uid_t uid)
1151{
1152    ALOGV("idmap target_apk=%s overlay_apk=%s uid=%d\n", target_apk, overlay_apk, uid);
1153
1154    int idmap_fd = -1;
1155    char idmap_path[PATH_MAX];
1156
1157    if (flatten_path(IDMAP_PREFIX, IDMAP_SUFFIX, overlay_apk,
1158                idmap_path, sizeof(idmap_path)) == -1) {
1159        ALOGE("idmap cannot generate idmap path for overlay %s\n", overlay_apk);
1160        goto fail;
1161    }
1162
1163    unlink(idmap_path);
1164    idmap_fd = open(idmap_path, O_RDWR | O_CREAT | O_EXCL, 0644);
1165    if (idmap_fd < 0) {
1166        ALOGE("idmap cannot open '%s' for output: %s\n", idmap_path, strerror(errno));
1167        goto fail;
1168    }
1169    if (fchown(idmap_fd, AID_SYSTEM, uid) < 0) {
1170        ALOGE("idmap cannot chown '%s'\n", idmap_path);
1171        goto fail;
1172    }
1173    if (fchmod(idmap_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0) {
1174        ALOGE("idmap cannot chmod '%s'\n", idmap_path);
1175        goto fail;
1176    }
1177
1178    pid_t pid;
1179    pid = fork();
1180    if (pid == 0) {
1181        /* child -- drop privileges before continuing */
1182        if (setgid(uid) != 0) {
1183            ALOGE("setgid(%d) failed during idmap\n", uid);
1184            exit(1);
1185        }
1186        if (setuid(uid) != 0) {
1187            ALOGE("setuid(%d) failed during idmap\n", uid);
1188            exit(1);
1189        }
1190        if (flock(idmap_fd, LOCK_EX | LOCK_NB) != 0) {
1191            ALOGE("flock(%s) failed during idmap: %s\n", idmap_path, strerror(errno));
1192            exit(1);
1193        }
1194
1195        run_idmap(target_apk, overlay_apk, idmap_fd);
1196        exit(1); /* only if exec call to idmap failed */
1197    } else {
1198        int status = wait_child(pid);
1199        if (status != 0) {
1200            ALOGE("idmap failed, status=0x%04x\n", status);
1201            goto fail;
1202        }
1203    }
1204
1205    close(idmap_fd);
1206    return 0;
1207fail:
1208    if (idmap_fd >= 0) {
1209        close(idmap_fd);
1210        unlink(idmap_path);
1211    }
1212    return -1;
1213}
1214