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replicant-frameworks_native/cmds/installd/utils.c
Nick Kralevich 0db0f97d87 installd: change profile files to 0660 
Profiling information leaks data about how people interact
with apps, so we don't want the data to be available
to other apps. Only the app and system_server need access.

Don't create the /data/dalvik-cache/profiles directory. init.rc
does it for us now.

Change-Id: Ic1b44009faa30d704855e97631006c4b990a4ad3
2014-06-12 14:54:43 -07:00

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/*
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "installd.h"
#define CACHE_NOISY(x) //x
int create_pkg_path_in_dir(char path[PKG_PATH_MAX],
const dir_rec_t* dir,
const char* pkgname,
const char* postfix)
{
const size_t postfix_len = strlen(postfix);
const size_t pkgname_len = strlen(pkgname);
if (pkgname_len > PKG_NAME_MAX) {
return -1;
}
if (is_valid_package_name(pkgname) < 0) {
return -1;
}
if ((pkgname_len + dir->len + postfix_len) >= PKG_PATH_MAX) {
return -1;
}
char *dst = path;
size_t dst_size = PKG_PATH_MAX;
if (append_and_increment(&dst, dir->path, &dst_size) < 0
|| append_and_increment(&dst, pkgname, &dst_size) < 0
|| append_and_increment(&dst, postfix, &dst_size) < 0) {
ALOGE("Error building APK path");
return -1;
}
return 0;
}
/**
* Create the package path name for a given package name with a postfix for
* a certain userid. Returns 0 on success, and -1 on failure.
*/
int create_pkg_path(char path[PKG_PATH_MAX],
const char *pkgname,
const char *postfix,
userid_t userid)
{
size_t userid_len;
char* userid_prefix;
if (userid == 0) {
userid_prefix = PRIMARY_USER_PREFIX;
userid_len = 0;
} else {
userid_prefix = SECONDARY_USER_PREFIX;
userid_len = snprintf(NULL, 0, "%d", userid);
}
const size_t prefix_len = android_data_dir.len + strlen(userid_prefix)
+ userid_len + 1 /*slash*/;
char prefix[prefix_len + 1];
char *dst = prefix;
size_t dst_size = sizeof(prefix);
if (append_and_increment(&dst, android_data_dir.path, &dst_size) < 0
|| append_and_increment(&dst, userid_prefix, &dst_size) < 0) {
ALOGE("Error building prefix for APK path");
return -1;
}
if (userid != 0) {
int ret = snprintf(dst, dst_size, "%d/", userid);
if (ret < 0 || (size_t) ret != userid_len + 1) {
ALOGW("Error appending UID to APK path");
return -1;
}
}
dir_rec_t dir;
dir.path = prefix;
dir.len = prefix_len;
return create_pkg_path_in_dir(path, &dir, pkgname, postfix);
}
/**
* Create the path name for user data for a certain userid.
* Returns 0 on success, and -1 on failure.
*/
int create_user_path(char path[PKG_PATH_MAX],
userid_t userid)
{
size_t userid_len;
char* userid_prefix;
if (userid == 0) {
userid_prefix = PRIMARY_USER_PREFIX;
userid_len = 0;
} else {
userid_prefix = SECONDARY_USER_PREFIX;
userid_len = snprintf(NULL, 0, "%d/", userid);
}
char *dst = path;
size_t dst_size = PKG_PATH_MAX;
if (append_and_increment(&dst, android_data_dir.path, &dst_size) < 0
|| append_and_increment(&dst, userid_prefix, &dst_size) < 0) {
ALOGE("Error building prefix for user path");
return -1;
}
if (userid != 0) {
if (dst_size < userid_len + 1) {
ALOGE("Error building user path");
return -1;
}
int ret = snprintf(dst, dst_size, "%d/", userid);
if (ret < 0 || (size_t) ret != userid_len) {
ALOGE("Error appending userid to path");
return -1;
}
}
return 0;
}
/**
* Create the path name for media for a certain userid.
* Returns 0 on success, and -1 on failure.
*/
int create_user_media_path(char path[PATH_MAX], userid_t userid) {
if (snprintf(path, PATH_MAX, "%s%d", android_media_dir.path, userid) > PATH_MAX) {
return -1;
}
return 0;
}
/**
* Create the path name for config for a certain userid.
* Returns 0 on success, and -1 on failure.
*/
int create_user_config_path(char path[PATH_MAX], userid_t userid) {
if (snprintf(path, PATH_MAX, "%s%d", "/data/misc/user/", userid) > PATH_MAX) {
return -1;
}
return 0;
}
int create_move_path(char path[PKG_PATH_MAX],
const char* pkgname,
const char* leaf,
userid_t userid)
{
if ((android_data_dir.len + strlen(PRIMARY_USER_PREFIX) + strlen(pkgname) + strlen(leaf) + 1)
>= PKG_PATH_MAX) {
return -1;
}
sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
return 0;
}
/**
* Checks whether the package name is valid. Returns -1 on error and
* 0 on success.
*/
int is_valid_package_name(const char* pkgname) {
const char *x = pkgname;
int alpha = -1;
while (*x) {
if (isalnum(*x) || (*x == '_')) {
/* alphanumeric or underscore are fine */
} else if (*x == '.') {
if ((x == pkgname) || (x[1] == '.') || (x[1] == 0)) {
/* periods must not be first, last, or doubled */
ALOGE("invalid package name '%s'\n", pkgname);
return -1;
}
} else if (*x == '-') {
/* Suffix -X is fine to let versioning of packages.
But whatever follows should be alphanumeric.*/
alpha = 1;
} else {
/* anything not A-Z, a-z, 0-9, _, or . is invalid */
ALOGE("invalid package name '%s'\n", pkgname);
return -1;
}
x++;
}
if (alpha == 1) {
// Skip current character
x++;
while (*x) {
if (!isalnum(*x)) {
ALOGE("invalid package name '%s' should include only numbers after -\n", pkgname);
return -1;
}
x++;
}
}
return 0;
}
static int _delete_dir_contents(DIR *d, const char *ignore)
{
int result = 0;
struct dirent *de;
int dfd;
dfd = dirfd(d);
if (dfd < 0) return -1;
while ((de = readdir(d))) {
const char *name = de->d_name;
/* skip the ignore name if provided */
if (ignore && !strcmp(name, ignore)) continue;
if (de->d_type == DT_DIR) {
int r, subfd;
DIR *subdir;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd < 0) {
ALOGE("Couldn't openat %s: %s\n", name, strerror(errno));
result = -1;
continue;
}
subdir = fdopendir(subfd);
if (subdir == NULL) {
ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
close(subfd);
result = -1;
continue;
}
if (_delete_dir_contents(subdir, 0)) {
result = -1;
}
closedir(subdir);
if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
ALOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
result = -1;
}
} else {
if (unlinkat(dfd, name, 0) < 0) {
ALOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
result = -1;
}
}
}
return result;
}
int delete_dir_contents(const char *pathname,
int also_delete_dir,
const char *ignore)
{
int res = 0;
DIR *d;
d = opendir(pathname);
if (d == NULL) {
ALOGE("Couldn't opendir %s: %s\n", pathname, strerror(errno));
return -errno;
}
res = _delete_dir_contents(d, ignore);
closedir(d);
if (also_delete_dir) {
if (rmdir(pathname)) {
ALOGE("Couldn't rmdir %s: %s\n", pathname, strerror(errno));
res = -1;
}
}
return res;
}
int delete_dir_contents_fd(int dfd, const char *name)
{
int fd, res;
DIR *d;
fd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
ALOGE("Couldn't openat %s: %s\n", name, strerror(errno));
return -1;
}
d = fdopendir(fd);
if (d == NULL) {
ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
close(fd);
return -1;
}
res = _delete_dir_contents(d, 0);
closedir(d);
return res;
}
int lookup_media_dir(char basepath[PATH_MAX], const char *dir)
{
DIR *d;
struct dirent *de;
struct stat s;
char* dirpos = basepath + strlen(basepath);
if ((*(dirpos-1)) != '/') {
*dirpos = '/';
dirpos++;
}
CACHE_NOISY(ALOGI("Looking up %s in %s\n", dir, basepath));
// Verify the path won't extend beyond our buffer, to avoid
// repeated checking later.
if ((dirpos-basepath+strlen(dir)) >= (PATH_MAX-1)) {
ALOGW("Path exceeds limit: %s%s", basepath, dir);
return -1;
}
// First, can we find this directory with the case that is given?
strcpy(dirpos, dir);
if (stat(basepath, &s) >= 0) {
CACHE_NOISY(ALOGI("Found direct: %s\n", basepath));
return 0;
}
// Not found with that case... search through all entries to find
// one that matches regardless of case.
*dirpos = 0;
d = opendir(basepath);
if (d == NULL) {
return -1;
}
while ((de = readdir(d))) {
if (strcasecmp(de->d_name, dir) == 0) {
strcpy(dirpos, de->d_name);
closedir(d);
CACHE_NOISY(ALOGI("Found search: %s\n", basepath));
return 0;
}
}
ALOGW("Couldn't find %s in %s", dir, basepath);
closedir(d);
return -1;
}
int64_t data_disk_free()
{
struct statfs sfs;
if (statfs(android_data_dir.path, &sfs) == 0) {
return sfs.f_bavail * sfs.f_bsize;
} else {
ALOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno));
return -1;
}
}
cache_t* start_cache_collection()
{
cache_t* cache = (cache_t*)calloc(1, sizeof(cache_t));
return cache;
}
#define CACHE_BLOCK_SIZE (512*1024)
static void* _cache_malloc(cache_t* cache, size_t len)
{
len = (len+3)&~3;
if (len > (CACHE_BLOCK_SIZE/2)) {
// It doesn't make sense to try to put this allocation into one
// of our blocks, because it is so big. Instead, make a new dedicated
// block for it.
int8_t* res = (int8_t*)malloc(len+sizeof(void*));
if (res == NULL) {
return NULL;
}
CACHE_NOISY(ALOGI("Allocated large cache mem block: %p size %d", res, len));
// Link it into our list of blocks, not disrupting the current one.
if (cache->memBlocks == NULL) {
*(void**)res = NULL;
cache->memBlocks = res;
} else {
*(void**)res = *(void**)cache->memBlocks;
*(void**)cache->memBlocks = res;
}
return res + sizeof(void*);
}
int8_t* res = cache->curMemBlockAvail;
int8_t* nextPos = res + len;
if (cache->memBlocks == NULL || nextPos > cache->curMemBlockEnd) {
int8_t* newBlock = malloc(CACHE_BLOCK_SIZE);
if (newBlock == NULL) {
return NULL;
}
CACHE_NOISY(ALOGI("Allocated new cache mem block: %p", newBlock));
*(void**)newBlock = cache->memBlocks;
cache->memBlocks = newBlock;
res = cache->curMemBlockAvail = newBlock + sizeof(void*);
cache->curMemBlockEnd = newBlock + CACHE_BLOCK_SIZE;
nextPos = res + len;
}
CACHE_NOISY(ALOGI("cache_malloc: ret %p size %d, block=%p, nextPos=%p",
res, len, cache->memBlocks, nextPos));
cache->curMemBlockAvail = nextPos;
return res;
}
static void* _cache_realloc(cache_t* cache, void* cur, size_t origLen, size_t len)
{
// This isn't really a realloc, but it is good enough for our purposes here.
void* alloc = _cache_malloc(cache, len);
if (alloc != NULL && cur != NULL) {
memcpy(alloc, cur, origLen < len ? origLen : len);
}
return alloc;
}
static void _inc_num_cache_collected(cache_t* cache)
{
cache->numCollected++;
if ((cache->numCollected%20000) == 0) {
ALOGI("Collected cache so far: %zd directories, %zd files",
cache->numDirs, cache->numFiles);
}
}
static cache_dir_t* _add_cache_dir_t(cache_t* cache, cache_dir_t* parent, const char *name)
{
size_t nameLen = strlen(name);
cache_dir_t* dir = (cache_dir_t*)_cache_malloc(cache, sizeof(cache_dir_t)+nameLen+1);
if (dir != NULL) {
dir->parent = parent;
dir->childCount = 0;
dir->hiddenCount = 0;
dir->deleted = 0;
strcpy(dir->name, name);
if (cache->numDirs >= cache->availDirs) {
size_t newAvail = cache->availDirs < 1000 ? 1000 : cache->availDirs*2;
cache_dir_t** newDirs = (cache_dir_t**)_cache_realloc(cache, cache->dirs,
cache->availDirs*sizeof(cache_dir_t*), newAvail*sizeof(cache_dir_t*));
if (newDirs == NULL) {
ALOGE("Failure growing cache dirs array for %s\n", name);
return NULL;
}
cache->availDirs = newAvail;
cache->dirs = newDirs;
}
cache->dirs[cache->numDirs] = dir;
cache->numDirs++;
if (parent != NULL) {
parent->childCount++;
}
_inc_num_cache_collected(cache);
} else {
ALOGE("Failure allocating cache_dir_t for %s\n", name);
}
return dir;
}
static cache_file_t* _add_cache_file_t(cache_t* cache, cache_dir_t* dir, time_t modTime,
const char *name)
{
size_t nameLen = strlen(name);
cache_file_t* file = (cache_file_t*)_cache_malloc(cache, sizeof(cache_file_t)+nameLen+1);
if (file != NULL) {
file->dir = dir;
file->modTime = modTime;
strcpy(file->name, name);
if (cache->numFiles >= cache->availFiles) {
size_t newAvail = cache->availFiles < 1000 ? 1000 : cache->availFiles*2;
cache_file_t** newFiles = (cache_file_t**)_cache_realloc(cache, cache->files,
cache->availFiles*sizeof(cache_file_t*), newAvail*sizeof(cache_file_t*));
if (newFiles == NULL) {
ALOGE("Failure growing cache file array for %s\n", name);
return NULL;
}
cache->availFiles = newAvail;
cache->files = newFiles;
}
CACHE_NOISY(ALOGI("Setting file %p at position %d in array %p", file,
cache->numFiles, cache->files));
cache->files[cache->numFiles] = file;
cache->numFiles++;
dir->childCount++;
_inc_num_cache_collected(cache);
} else {
ALOGE("Failure allocating cache_file_t for %s\n", name);
}
return file;
}
static int _add_cache_files(cache_t *cache, cache_dir_t *parentDir, const char *dirName,
DIR* dir, char *pathBase, char *pathPos, size_t pathAvailLen)
{
struct dirent *de;
cache_dir_t* cacheDir = NULL;
int dfd;
CACHE_NOISY(ALOGI("_add_cache_files: parent=%p dirName=%s dir=%p pathBase=%s",
parentDir, dirName, dir, pathBase));
dfd = dirfd(dir);
if (dfd < 0) return 0;
// Sub-directories always get added to the data structure, so if they
// are empty we will know about them to delete them later.
cacheDir = _add_cache_dir_t(cache, parentDir, dirName);
while ((de = readdir(dir))) {
const char *name = de->d_name;
if (de->d_type == DT_DIR) {
int subfd;
DIR *subdir;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd < 0) {
ALOGE("Couldn't openat %s: %s\n", name, strerror(errno));
continue;
}
subdir = fdopendir(subfd);
if (subdir == NULL) {
ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
close(subfd);
continue;
}
if (cacheDir == NULL) {
cacheDir = _add_cache_dir_t(cache, parentDir, dirName);
}
if (cacheDir != NULL) {
// Update pathBase for the new path... this may change dirName
// if that is also pointing to the path, but we are done with it
// now.
size_t finallen = snprintf(pathPos, pathAvailLen, "/%s", name);
CACHE_NOISY(ALOGI("Collecting dir %s\n", pathBase));
if (finallen < pathAvailLen) {
_add_cache_files(cache, cacheDir, name, subdir, pathBase,
pathPos+finallen, pathAvailLen-finallen);
} else {
// Whoops, the final path is too long! We'll just delete
// this directory.
ALOGW("Cache dir %s truncated in path %s; deleting dir\n",
name, pathBase);
_delete_dir_contents(subdir, NULL);
if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
ALOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
}
}
}
closedir(subdir);
} else if (de->d_type == DT_REG) {
// Skip files that start with '.'; they will be deleted if
// their entire directory is deleted. This allows for metadata
// like ".nomedia" to remain in the directory until the entire
// directory is deleted.
if (cacheDir == NULL) {
cacheDir = _add_cache_dir_t(cache, parentDir, dirName);
}
if (name[0] == '.') {
cacheDir->hiddenCount++;
continue;
}
if (cacheDir != NULL) {
// Build final full path for file... this may change dirName
// if that is also pointing to the path, but we are done with it
// now.
size_t finallen = snprintf(pathPos, pathAvailLen, "/%s", name);
CACHE_NOISY(ALOGI("Collecting file %s\n", pathBase));
if (finallen < pathAvailLen) {
struct stat s;
if (stat(pathBase, &s) >= 0) {
_add_cache_file_t(cache, cacheDir, s.st_mtime, name);
} else {
ALOGW("Unable to stat cache file %s; deleting\n", pathBase);
if (unlink(pathBase) < 0) {
ALOGE("Couldn't unlink %s: %s\n", pathBase, strerror(errno));
}
}
} else {
// Whoops, the final path is too long! We'll just delete
// this file.
ALOGW("Cache file %s truncated in path %s; deleting\n",
name, pathBase);
if (unlinkat(dfd, name, 0) < 0) {
*pathPos = 0;
ALOGE("Couldn't unlinkat %s in %s: %s\n", name, pathBase,
strerror(errno));
}
}
}
} else {
cacheDir->hiddenCount++;
}
}
return 0;
}
void add_cache_files(cache_t* cache, const char *basepath, const char *cachedir)
{
DIR *d;
struct dirent *de;
char dirname[PATH_MAX];
CACHE_NOISY(ALOGI("add_cache_files: base=%s cachedir=%s\n", basepath, cachedir));
d = opendir(basepath);
if (d == NULL) {
return;
}
while ((de = readdir(d))) {
if (de->d_type == DT_DIR) {
DIR* subdir;
const char *name = de->d_name;
char* pathpos;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
strcpy(dirname, basepath);
pathpos = dirname + strlen(dirname);
if ((*(pathpos-1)) != '/') {
*pathpos = '/';
pathpos++;
*pathpos = 0;
}
if (cachedir != NULL) {
snprintf(pathpos, sizeof(dirname)-(pathpos-dirname), "%s/%s", name, cachedir);
} else {
snprintf(pathpos, sizeof(dirname)-(pathpos-dirname), "%s", name);
}
CACHE_NOISY(ALOGI("Adding cache files from dir: %s\n", dirname));
subdir = opendir(dirname);
if (subdir != NULL) {
size_t dirnameLen = strlen(dirname);
_add_cache_files(cache, NULL, dirname, subdir, dirname, dirname+dirnameLen,
PATH_MAX - dirnameLen);
closedir(subdir);
}
}
}
closedir(d);
}
static char *create_dir_path(char path[PATH_MAX], cache_dir_t* dir)
{
char *pos = path;
if (dir->parent != NULL) {
pos = create_dir_path(path, dir->parent);
}
// Note that we don't need to worry about going beyond the buffer,
// since when we were constructing the cache entries our maximum
// buffer size for full paths was PATH_MAX.
strcpy(pos, dir->name);
pos += strlen(pos);
*pos = '/';
pos++;
*pos = 0;
return pos;
}
static void delete_cache_dir(char path[PATH_MAX], cache_dir_t* dir)
{
if (dir->parent != NULL) {
create_dir_path(path, dir);
ALOGI("DEL DIR %s\n", path);
if (dir->hiddenCount <= 0) {
if (rmdir(path)) {
ALOGE("Couldn't rmdir %s: %s\n", path, strerror(errno));
return;
}
} else {
// The directory contains hidden files so we need to delete
// them along with the directory itself.
if (delete_dir_contents(path, 1, NULL)) {
return;
}
}
dir->parent->childCount--;
dir->deleted = 1;
if (dir->parent->childCount <= 0) {
delete_cache_dir(path, dir->parent);
}
} else if (dir->hiddenCount > 0) {
// This is a root directory, but it has hidden files. Get rid of
// all of those files, but not the directory itself.
create_dir_path(path, dir);
ALOGI("DEL CONTENTS %s\n", path);
delete_dir_contents(path, 0, NULL);
}
}
static int cache_modtime_sort(const void *lhsP, const void *rhsP)
{
const cache_file_t *lhs = *(const cache_file_t**)lhsP;
const cache_file_t *rhs = *(const cache_file_t**)rhsP;
return lhs->modTime < rhs->modTime ? -1 : (lhs->modTime > rhs->modTime ? 1 : 0);
}
void clear_cache_files(cache_t* cache, int64_t free_size)
{
size_t i;
int skip = 0;
char path[PATH_MAX];
ALOGI("Collected cache files: %zd directories, %zd files",
cache->numDirs, cache->numFiles);
CACHE_NOISY(ALOGI("Sorting files..."));
qsort(cache->files, cache->numFiles, sizeof(cache_file_t*),
cache_modtime_sort);
CACHE_NOISY(ALOGI("Cleaning empty directories..."));
for (i=cache->numDirs; i>0; i--) {
cache_dir_t* dir = cache->dirs[i-1];
if (dir->childCount <= 0 && !dir->deleted) {
delete_cache_dir(path, dir);
}
}
CACHE_NOISY(ALOGI("Trimming files..."));
for (i=0; i<cache->numFiles; i++) {
skip++;
if (skip > 10) {
if (data_disk_free() > free_size) {
return;
}
skip = 0;
}
cache_file_t* file = cache->files[i];
strcpy(create_dir_path(path, file->dir), file->name);
ALOGI("DEL (mod %d) %s\n", (int)file->modTime, path);
if (unlink(path) < 0) {
ALOGE("Couldn't unlink %s: %s\n", path, strerror(errno));
}
file->dir->childCount--;
if (file->dir->childCount <= 0) {
delete_cache_dir(path, file->dir);
}
}
}
void finish_cache_collection(cache_t* cache)
{
size_t i;
CACHE_NOISY(ALOGI("clear_cache_files: %d dirs, %d files\n", cache->numDirs, cache->numFiles));
CACHE_NOISY(
for (i=0; i<cache->numDirs; i++) {
cache_dir_t* dir = cache->dirs[i];
ALOGI("dir #%d: %p %s parent=%p\n", i, dir, dir->name, dir->parent);
})
CACHE_NOISY(
for (i=0; i<cache->numFiles; i++) {
cache_file_t* file = cache->files[i];
ALOGI("file #%d: %p %s time=%d dir=%p\n", i, file, file->name,
(int)file->modTime, file->dir);
})
void* block = cache->memBlocks;
while (block != NULL) {
void* nextBlock = *(void**)block;
CACHE_NOISY(ALOGI("Freeing cache mem block: %p", block));
free(block);
block = nextBlock;
}
free(cache);
}
/**
* Checks whether a path points to a system app (.apk file). Returns 0
* if it is a system app or -1 if it is not.
*/
int validate_system_app_path(const char* path) {
size_t i;
for (i = 0; i < android_system_dirs.count; i++) {
const size_t dir_len = android_system_dirs.dirs[i].len;
if (!strncmp(path, android_system_dirs.dirs[i].path, dir_len)) {
if (path[dir_len] == '.' || strchr(path + dir_len, '/') != NULL) {
ALOGE("invalid system apk path '%s' (trickery)\n", path);
return -1;
}
return 0;
}
}
return -1;
}
/**
* Get the contents of a environment variable that contains a path. Caller
* owns the string that is inserted into the directory record. Returns
* 0 on success and -1 on error.
*/
int get_path_from_env(dir_rec_t* rec, const char* var) {
const char* path = getenv(var);
int ret = get_path_from_string(rec, path);
if (ret < 0) {
ALOGW("Problem finding value for environment variable %s\n", var);
}
return ret;
}
/**
* Puts the string into the record as a directory. Appends '/' to the end
* of all paths. Caller owns the string that is inserted into the directory
* record. A null value will result in an error.
*
* Returns 0 on success and -1 on error.
*/
int get_path_from_string(dir_rec_t* rec, const char* path) {
if (path == NULL) {
return -1;
} else {
const size_t path_len = strlen(path);
if (path_len <= 0) {
return -1;
}
// Make sure path is absolute.
if (path[0] != '/') {
return -1;
}
if (path[path_len - 1] == '/') {
// Path ends with a forward slash. Make our own copy.
rec->path = strdup(path);
if (rec->path == NULL) {
return -1;
}
rec->len = path_len;
} else {
// Path does not end with a slash. Generate a new string.
char *dst;
// Add space for slash and terminating null.
size_t dst_size = path_len + 2;
rec->path = malloc(dst_size);
if (rec->path == NULL) {
return -1;
}
dst = rec->path;
if (append_and_increment(&dst, path, &dst_size) < 0
|| append_and_increment(&dst, "/", &dst_size)) {
ALOGE("Error canonicalizing path");
return -1;
}
rec->len = dst - rec->path;
}
}
return 0;
}
int copy_and_append(dir_rec_t* dst, const dir_rec_t* src, const char* suffix) {
dst->len = src->len + strlen(suffix);
const size_t dstSize = dst->len + 1;
dst->path = (char*) malloc(dstSize);
if (dst->path == NULL
|| snprintf(dst->path, dstSize, "%s%s", src->path, suffix)
!= (ssize_t) dst->len) {
ALOGE("Could not allocate memory to hold appended path; aborting\n");
return -1;
}
return 0;
}
/**
* Check whether path points to a valid path for an APK file. An ASEC
* directory is allowed to have one level of subdirectory names. Returns -1
* when an invalid path is encountered and 0 when a valid path is encountered.
*/
int validate_apk_path(const char *path)
{
int allowsubdir = 0;
char *subdir = NULL;
size_t dir_len;
size_t path_len;
if (!strncmp(path, android_app_dir.path, android_app_dir.len)) {
dir_len = android_app_dir.len;
} else if (!strncmp(path, android_app_private_dir.path, android_app_private_dir.len)) {
dir_len = android_app_private_dir.len;
} else if (!strncmp(path, android_asec_dir.path, android_asec_dir.len)) {
dir_len = android_asec_dir.len;
allowsubdir = 1;
} else {
ALOGE("invalid apk path '%s' (bad prefix)\n", path);
return -1;
}
path_len = strlen(path);
/*
* Only allow the path to have a subdirectory if it's been marked as being allowed.
*/
if ((subdir = strchr(path + dir_len, '/')) != NULL) {
++subdir;
if (!allowsubdir
|| (path_len > (size_t) (subdir - path) && (strchr(subdir, '/') != NULL))) {
ALOGE("invalid apk path '%s' (subdir?)\n", path);
return -1;
}
}
/*
* Directories can't have a period directly after the directory markers
* to prevent ".."
*/
if (path[dir_len] == '.'
|| (subdir != NULL && ((*subdir == '.') || (strchr(subdir, '/') != NULL)))) {
ALOGE("invalid apk path '%s' (trickery)\n", path);
return -1;
}
return 0;
}
int append_and_increment(char** dst, const char* src, size_t* dst_size) {
ssize_t ret = strlcpy(*dst, src, *dst_size);
if (ret < 0 || (size_t) ret >= *dst_size) {
return -1;
}
*dst += ret;
*dst_size -= ret;
return 0;
}
char *build_string2(char *s1, char *s2) {
if (s1 == NULL || s2 == NULL) return NULL;
int len_s1 = strlen(s1);
int len_s2 = strlen(s2);
int len = len_s1 + len_s2 + 1;
char *result = malloc(len);
if (result == NULL) return NULL;
strcpy(result, s1);
strcpy(result + len_s1, s2);
return result;
}
char *build_string3(char *s1, char *s2, char *s3) {
if (s1 == NULL || s2 == NULL || s3 == NULL) return NULL;
int len_s1 = strlen(s1);
int len_s2 = strlen(s2);
int len_s3 = strlen(s3);
int len = len_s1 + len_s2 + len_s3 + 1;
char *result = malloc(len);
if (result == NULL) return NULL;
strcpy(result, s1);
strcpy(result + len_s1, s2);
strcpy(result + len_s1 + len_s2, s3);
return result;
}
/* Ensure that /data/media directories are prepared for given user. */
int ensure_media_user_dirs(userid_t userid) {
char media_user_path[PATH_MAX];
char path[PATH_MAX];
// Ensure /data/media/<userid> exists
create_user_media_path(media_user_path, userid);
if (fs_prepare_dir(media_user_path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
return -1;
}
return 0;
}
int ensure_config_user_dirs(userid_t userid) {
char config_user_path[PATH_MAX];
char path[PATH_MAX];
// writable by system, readable by any app within the same user
const int uid = (userid * AID_USER) + AID_SYSTEM;
const int gid = (userid * AID_USER) + AID_EVERYBODY;
// Ensure /data/misc/user/<userid> exists
create_user_config_path(config_user_path, userid);
if (fs_prepare_dir(config_user_path, 0750, uid, gid) == -1) {
return -1;
}
return 0;
}
int create_profile_file(const char *pkgname, gid_t gid) {
const char *profile_dir = DALVIK_CACHE_PREFIX "profiles";
char profile_file[PKG_PATH_MAX];
snprintf(profile_file, sizeof(profile_file), "%s/%s", profile_dir, pkgname);
// The 'system' user needs to be able to read the profile to determine if dex2oat
// needs to be run. This is done in dalvik.system.DexFile.isDexOptNeededInternal(). So
// we assign ownership to AID_SYSTEM and ensure it's not world-readable.
int fd = open(profile_file, O_WRONLY | O_CREAT | O_NOFOLLOW | O_CLOEXEC, 0660);
// Always set the uid/gid/permissions. The file could have been previously created
// with different permissions.
if (fd >= 0) {
if (fchown(fd, AID_SYSTEM, gid) < 0) {
ALOGE("cannot chown profile file '%s': %s\n", profile_file, strerror(errno));
close(fd);
unlink(profile_file);
return -1;
}
if (fchmod(fd, 0660) < 0) {
ALOGE("cannot chmod profile file '%s': %s\n", profile_file, strerror(errno));
close(fd);
unlink(profile_file);
return -1;
}
close(fd);
}
return 0;
}
void remove_profile_file(const char *pkgname) {
char profile_file[PKG_PATH_MAX];
snprintf(profile_file, sizeof(profile_file), "%s/%s", DALVIK_CACHE_PREFIX "profiles", pkgname);
unlink(profile_file);
}
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