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am 6c14f0ad: Merge "Runtime resource overlay, iteration 2"

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* commit '6c14f0ad82be418c742e56fe586657ea0f394b05':
  Runtime resource overlay, iteration 2
This commit is contained in:
Dianne Hackborn 2014-03-07 02:27:06 +00:00 committed by Android Git Automerger
commit c43da752a7
3 changed files with 129 additions and 10 deletions
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128
cmds/installd/commands.c
View File

@ -618,14 +618,11 @@ static void run_dex2oat(int zip_fd, int oat_fd, const char* input_file_name,
ALOGE("execl(%s) failed: %s\n", DEX2OAT_BIN, strerror(errno));
}
static int wait_dexopt(pid_t pid, const char* apk_path)
static int wait_child(pid_t pid)
{
int status;
pid_t got_pid;
/*
* Wait for the optimization process to finish.
*/
while (1) {
got_pid = waitpid(pid, &status, 0);
if (got_pid == -1 && errno == EINTR) {
@ -641,11 +638,8 @@ static int wait_dexopt(pid_t pid, const char* apk_path)
}
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
return 0;
} else {
ALOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
apk_path, status);
return status; /* always nonzero */
}
}
@ -747,9 +741,11 @@ int dexopt(const char *apk_path, uid_t uid, int is_public)
}
exit(68); /* only get here on exec failure */
} else {
res = wait_dexopt(pid, apk_path);
if (res != 0) {
ALOGE("dexopt in='%s' out='%s' res=%d\n", apk_path, out_path, res);
res = wait_child(pid);
if (res == 0) {
ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
} else {
ALOGE("DexInv: --- END '%s' --- status=0x%04x, process failed\n", apk_path, res);
goto fail;
}
}
@ -1103,3 +1099,115 @@ out:
return rc;
}
static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd)
{
static const char *IDMAP_BIN = "/system/bin/idmap";
static const size_t MAX_INT_LEN = 32;
char idmap_str[MAX_INT_LEN];
snprintf(idmap_str, sizeof(idmap_str), "%d", idmap_fd);
execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, idmap_str, (char*)NULL);
ALOGE("execl(%s) failed: %s\n", IDMAP_BIN, strerror(errno));
}
// Transform string /a/b/c.apk to (prefix)/a@b@c.apk@(suffix)
// eg /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap
static int flatten_path(const char *prefix, const char *suffix,
const char *overlay_path, char *idmap_path, size_t N)
{
if (overlay_path == NULL || idmap_path == NULL) {
return -1;
}
const size_t len_overlay_path = strlen(overlay_path);
// will access overlay_path + 1 further below; requires absolute path
if (len_overlay_path < 2 || *overlay_path != '/') {
return -1;
}
const size_t len_idmap_root = strlen(prefix);
const size_t len_suffix = strlen(suffix);
if (SIZE_MAX - len_idmap_root < len_overlay_path ||
SIZE_MAX - (len_idmap_root + len_overlay_path) < len_suffix) {
// additions below would cause overflow
return -1;
}
if (N < len_idmap_root + len_overlay_path + len_suffix) {
return -1;
}
memset(idmap_path, 0, N);
snprintf(idmap_path, N, "%s%s%s", prefix, overlay_path + 1, suffix);
char *ch = idmap_path + len_idmap_root;
while (*ch != '\0') {
if (*ch == '/') {
*ch = '@';
}
++ch;
}
return 0;
}
int idmap(const char *target_apk, const char *overlay_apk, uid_t uid)
{
ALOGV("idmap target_apk=%s overlay_apk=%s uid=%d\n", target_apk, overlay_apk, uid);
int idmap_fd = -1;
char idmap_path[PATH_MAX];
if (flatten_path(IDMAP_PREFIX, IDMAP_SUFFIX, overlay_apk,
idmap_path, sizeof(idmap_path)) == -1) {
ALOGE("idmap cannot generate idmap path for overlay %s\n", overlay_apk);
goto fail;
}
unlink(idmap_path);
idmap_fd = open(idmap_path, O_RDWR | O_CREAT | O_EXCL, 0644);
if (idmap_fd < 0) {
ALOGE("idmap cannot open '%s' for output: %s\n", idmap_path, strerror(errno));
goto fail;
}
if (fchown(idmap_fd, AID_SYSTEM, uid) < 0) {
ALOGE("idmap cannot chown '%s'\n", idmap_path);
goto fail;
}
if (fchmod(idmap_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0) {
ALOGE("idmap cannot chmod '%s'\n", idmap_path);
goto fail;
}
pid_t pid;
pid = fork();
if (pid == 0) {
/* child -- drop privileges before continuing */
if (setgid(uid) != 0) {
ALOGE("setgid(%d) failed during idmap\n", uid);
exit(1);
}
if (setuid(uid) != 0) {
ALOGE("setuid(%d) failed during idmap\n", uid);
exit(1);
}
if (flock(idmap_fd, LOCK_EX | LOCK_NB) != 0) {
ALOGE("flock(%s) failed during idmap: %s\n", idmap_path, strerror(errno));
exit(1);
}
run_idmap(target_apk, overlay_apk, idmap_fd);
exit(1); /* only if exec call to idmap failed */
} else {
int status = wait_child(pid);
if (status != 0) {
ALOGE("idmap failed, status=0x%04x\n", status);
goto fail;
}
}
close(idmap_fd);
return 0;
fail:
if (idmap_fd >= 0) {
close(idmap_fd);
unlink(idmap_path);
}
return -1;
}

7
cmds/installd/installd.c
View File

@ -124,6 +124,11 @@ static int do_linklib(char **arg, char reply[REPLY_MAX])
return linklib(arg[0], arg[1], atoi(arg[2]));
}
static int do_idmap(char **arg, char reply[REPLY_MAX])
{
return idmap(arg[0], arg[1], atoi(arg[2]));
}
struct cmdinfo {
const char *name;
unsigned numargs;
@ -147,6 +152,7 @@ struct cmdinfo cmds[] = {
{ "linklib", 3, do_linklib },
{ "mkuserdata", 4, do_mk_user_data },
{ "rmuser", 1, do_rm_user },
{ "idmap", 3, do_idmap },
};
static int readx(int s, void *_buf, int count)
@ -515,6 +521,7 @@ static void drop_privileges() {
capdata[CAP_TO_INDEX(CAP_CHOWN)].permitted |= CAP_TO_MASK(CAP_CHOWN);
capdata[CAP_TO_INDEX(CAP_SETUID)].permitted |= CAP_TO_MASK(CAP_SETUID);
capdata[CAP_TO_INDEX(CAP_SETGID)].permitted |= CAP_TO_MASK(CAP_SETGID);
capdata[CAP_TO_INDEX(CAP_FOWNER)].permitted |= CAP_TO_MASK(CAP_FOWNER);
capdata[0].effective = capdata[0].permitted;
capdata[1].effective = capdata[1].permitted;

4
cmds/installd/installd.h
View File

@ -75,6 +75,9 @@
#define UPDATE_COMMANDS_DIR_PREFIX "/system/etc/updatecmds/"
#define IDMAP_PREFIX "/data/resource-cache/"
#define IDMAP_SUFFIX "@idmap"
#define PKG_NAME_MAX 128 /* largest allowed package name */
#define PKG_PATH_MAX 256 /* max size of any path we use */
@ -207,3 +210,4 @@ int free_cache(int64_t free_size);
int dexopt(const char *apk_path, uid_t uid, int is_public);
int movefiles();
int linklib(const char* target, const char* source, int userId);
int idmap(const char *target_path, const char *overlay_path, uid_t uid);