Merge "liblog: check getgroups for AID_LOG for AID_LOG_SECURITY" am: b5eb67ff23 (bd09939e) · Commits · e / os / android_system_core

liblog/logd_write.c

+27 −5

Original line number	Diff line number	Diff line
		@@ -204,18 +204,40 @@ static int __write_to_log_daemon(log_id_t log_id, struct iovec *vec, size_t nr)
		if (vec[0].iov_len < 4) {
		return -EINVAL;
		}
		if ((last_uid != AID_SYSTEM) && (last_uid != AID_ROOT)) {
		/* Matches clientHasLogCredentials() in logd */
		if ((last_uid != AID_SYSTEM) && (last_uid != AID_ROOT) && (last_uid != AID_LOG)) {
		uid_t uid = geteuid();
		if ((uid != AID_SYSTEM) && (uid != AID_ROOT)) {
		if ((uid != AID_SYSTEM) && (uid != AID_ROOT) && (uid != AID_LOG)) {
		gid_t gid = getgid();
		if ((gid != AID_SYSTEM) && (gid != AID_ROOT)) {
		if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) {
		gid = getegid();
		if ((gid != AID_SYSTEM) && (gid != AID_ROOT)) {
		if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) {
		int num_groups;
		gid_t *groups;

		num_groups = getgroups(0, NULL);
		if (num_groups <= 0) {
		return -EPERM;
		}
		groups = calloc(num_groups, sizeof(gid_t));
		if (!groups) {
		return -ENOMEM;
		}
		num_groups = getgroups(num_groups, groups);
		while (num_groups > 0) {
		if (groups[num_groups - 1] == AID_LOG) {
		break;
		}
		--num_groups;
		}
		free(groups);
		if (num_groups <= 0) {
		return -EPERM;
		}
		}
		}
		}
		}
		if (!__android_log_security()) {
		atomic_store(&dropped_security, 0);
		return -EPERM;