252 lines
7.3 KiB
C++
252 lines
7.3 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source 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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#define LOG_TAG "Vold"
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#include "Fat.h"
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#include "PublicVolume.h"
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#include "Utils.h"
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#include <base/stringprintf.h>
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#include <cutils/fs.h>
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#include <cutils/log.h>
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#include <private/android_filesystem_config.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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static const char* kBlkidPath = "/system/bin/blkid";
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static const char* kFusePath = "/system/bin/sdcard";
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static const char* kUserMountPath = "/mnt/user";
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PublicVolume::PublicVolume(dev_t device) :
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VolumeBase(VolumeType::kPublic), mDevice(device), mFusePid(0), mPrimary(false) {
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mId = StringPrintf("public:%ud:%ud", major(device), minor(device));
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mDevPath = StringPrintf("/dev/block/vold/%ud:%ud", major(device), minor(device));
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mRawPath = StringPrintf("/mnt/media_rw/public_raw_%ud:%ud", major(device), minor(device));
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mFusePath = StringPrintf("/mnt/media_rw/public_fuse_%ud:%ud", major(device), minor(device));
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CreateDeviceNode(mDevPath, device);
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}
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PublicVolume::~PublicVolume() {
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DestroyDeviceNode(mDevPath);
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}
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status_t PublicVolume::readMetadata() {
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mFsUuid = "";
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mFsLabel = "";
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std::string path(StringPrintf("%s -c /dev/null %s", kBlkidPath, mDevPath.c_str()));
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FILE* fp = popen(path.c_str(), "r");
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if (!fp) {
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ALOGE("Failed to run %s: %s", path.c_str(), strerror(errno));
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return -errno;
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}
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char line[1024];
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char value[128];
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if (fgets(line, sizeof(line), fp) != nullptr) {
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ALOGD("blkid identified as %s", line);
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char* start = strstr(line, "UUID=");
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if (start != nullptr && sscanf(start + 5, "\"%127[^\"]\"", value) == 1) {
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mFsUuid = value;
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}
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start = strstr(line, "LABEL=");
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if (start != nullptr && sscanf(start + 6, "\"%127[^\"]\"", value) == 1) {
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mFsLabel = value;
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}
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} else {
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ALOGW("blkid failed to identify %s", mDevPath.c_str());
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return -ENODATA;
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}
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pclose(fp);
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// TODO: broadcast ident to framework
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return OK;
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}
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status_t PublicVolume::initAsecStage() {
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std::string legacyPath(mRawPath + "/android_secure");
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std::string securePath(mRawPath + "/.android_secure");
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// Recover legacy secure path
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if (!access(legacyPath.c_str(), R_OK | X_OK)
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&& access(securePath.c_str(), R_OK | X_OK)) {
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if (rename(legacyPath.c_str(), securePath.c_str())) {
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SLOGE("Failed to rename legacy ASEC dir: %s", strerror(errno));
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}
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}
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if (fs_prepare_dir(securePath.c_str(), 0770, AID_MEDIA_RW, AID_MEDIA_RW) != 0) {
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SLOGW("fs_prepare_dir failed: %s", strerror(errno));
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return -errno;
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}
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return OK;
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}
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status_t PublicVolume::doMount() {
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if (Fat::check(mDevPath.c_str())) {
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SLOGE("Failed filesystem check; not mounting");
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return -EIO;
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}
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if (fs_prepare_dir(mRawPath.c_str(), 0770, AID_MEDIA_RW, AID_MEDIA_RW)) {
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SLOGE("Failed to create mount point %s: %s", mRawPath.c_str(), strerror(errno));
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return -errno;
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}
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if (fs_prepare_dir(mFusePath.c_str(), 0770, AID_MEDIA_RW, AID_MEDIA_RW)) {
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SLOGE("Failed to create mount point %s: %s", mFusePath.c_str(), strerror(errno));
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return -errno;
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}
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if (Fat::doMount(mDevPath.c_str(), mRawPath.c_str(), false, false, false,
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AID_MEDIA_RW, AID_MEDIA_RW, 0007, true)) {
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SLOGE("Failed to mount %s: %s", mDevPath.c_str(), strerror(errno));
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return -EIO;
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}
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if (!(mFusePid = fork())) {
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if (mPrimary) {
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if (execl(kFusePath,
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"-u", "1023", // AID_MEDIA_RW
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"-g", "1023", // AID_MEDIA_RW
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"-d",
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mRawPath.c_str(),
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mFusePath.c_str())) {
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SLOGE("Failed to exec: %s", strerror(errno));
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}
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} else {
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if (execl(kFusePath,
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"-u", "1023", // AID_MEDIA_RW
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"-g", "1023", // AID_MEDIA_RW
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"-w", "1023", // AID_MEDIA_RW
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"-d",
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mRawPath.c_str(),
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mFusePath.c_str())) {
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SLOGE("Failed to exec: %s", strerror(errno));
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}
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}
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_exit(1);
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}
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if (mFusePid == -1) {
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SLOGE("Failed to fork: %s", strerror(errno));
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return -errno;
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}
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return OK;
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}
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status_t PublicVolume::doUnmount() {
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if (mFusePid > 0) {
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kill(mFusePid, SIGTERM);
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TEMP_FAILURE_RETRY(waitpid(mFusePid, nullptr, 0));
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mFusePid = 0;
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}
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ForceUnmount(mFusePath);
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ForceUnmount(mRawPath);
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TEMP_FAILURE_RETRY(unlink(mRawPath.c_str()));
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TEMP_FAILURE_RETRY(unlink(mFusePath.c_str()));
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return OK;
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}
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status_t PublicVolume::doFormat() {
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if (Fat::format(mDevPath.c_str(), 0, true)) {
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SLOGE("Failed to format: %s", strerror(errno));
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return -errno;
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}
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return OK;
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}
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status_t PublicVolume::bindUser(userid_t user) {
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return bindUserInternal(user, true);
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}
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status_t PublicVolume::unbindUser(userid_t user) {
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return bindUserInternal(user, false);
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}
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status_t PublicVolume::bindUserInternal(userid_t user, bool bind) {
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if (mPrimary) {
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if (user == 0) {
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std::string path(StringPrintf("%s/%ud/primary", kUserMountPath, user));
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if (bind) {
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mountBind(mFusePath, path);
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} else {
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unmountBind(path);
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}
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} else {
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// Public volumes are only visible to owner when primary
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// storage, so we don't mount for secondary users.
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}
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} else {
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std::string path(StringPrintf("%s/%ud/public_%ud:%ud", kUserMountPath, user,
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major(mDevice), minor(mDevice)));
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if (bind) {
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mountBind(mFusePath, path);
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} else {
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unmountBind(path);
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}
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if (user != 0) {
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// To prevent information leakage between users, only owner
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// has access to the Android directory
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path += "/Android";
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if (bind) {
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if (::mount("tmpfs", path.c_str(), "tmpfs", MS_NOSUID, "mode=0000")) {
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SLOGE("Failed to protect secondary path %s: %s",
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path.c_str(), strerror(errno));
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return -errno;
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}
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} else {
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ForceUnmount(path);
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}
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}
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}
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return OK;
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}
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void PublicVolume::setPrimary(bool primary) {
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if (getState() != VolumeState::kUnmounted) {
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SLOGE("Primary state change requires %s to be unmounted", getId().c_str());
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return;
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}
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mPrimary = primary;
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}
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} // namespace vold
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} // namespace android
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