d58ba18272
This allows flame to boot TWRP. Still will need to work on super partition for vendor and system access. The plan will be to cherry-pick any updates to android-9.0 through gerrit.twrp.me to this branch as a WIP.
90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/*
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* Copyright (C) 2014 The Team Win Recovery Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* The purpose of these functions is to try to get and set the proper
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* file permissions, SELinux contexts, owner, and group so that these
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* files are accessible when we boot up to normal Android via MTP and to
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* file manager apps. During early boot we try to read the contexts and
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* owner / group info from /data/media or from /data/media/0 and store
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* them in static variables. From there, we'll try to set the same
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* contexts, owner, and group information on most files we create during
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* operations like backups, copying the log, and MTP operations.
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*/
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#include <sys/stat.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "selinux/selinux.h"
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static security_context_t selinux_context;
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struct stat s;
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static int has_stat = 0;
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int tw_get_context(const char* filename) {
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if (lgetfilecon(filename, &selinux_context) >= 0) {
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printf("tw_get_context got selinux context: %s\n", selinux_context);
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return 0;
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} else {
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printf("tw_get_context failed to get selinux context\n");
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selinux_context = NULL;
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}
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return -1;
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}
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int tw_get_stat(const char* filename) {
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if (lstat(filename, &s) == 0) {
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has_stat = 1;
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return 0;
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}
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printf("tw_get_stat failed to lstat '%s'\n", filename);
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return -1;
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}
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int tw_get_default_metadata(const char* filename) {
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if (tw_get_context(filename) == 0 && tw_get_stat(filename) == 0)
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return 0;
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return -1;
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}
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// Most of this logging is disabled to prevent log spam if we are trying
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// to set contexts and permissions on file systems that do not support
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// these types of things (e.g. vfat / FAT / FAT32).
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int tw_set_default_metadata(const char* filename) {
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int ret = 0;
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struct stat st;
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if (selinux_context == NULL) {
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//printf("selinux_context was null, '%s'\n", filename);
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ret = -1;
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} else if (lsetfilecon(filename, selinux_context) < 0) {
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//printf("Failed to set default contexts on '%s'.\n", filename);
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ret = -1;
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}
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if (lstat(filename, &st) == 0 && st.st_mode & S_IFREG && chmod(filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH) < 0) {
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//printf("Failed to chmod '%s'\n", filename);
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ret = -1;
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}
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if (has_stat && chown(filename, s.st_uid, s.st_gid) < 0) {
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//printf("Failed to lchown '%s'.\n", filename);
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ret = -1;
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}
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//printf("Done trying to set defaults on '%s'\n");
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return ret;
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}
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