| /* |
| * Copyright (C) 2014 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 <ctype.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <unistd.h> |
| |
| #include <algorithm> |
| #include <utility> |
| #include <vector> |
| |
| #include <android-base/file.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| |
| #include "fs_mgr_priv.h" |
| |
| using android::base::StartsWith; |
| |
| const std::string kDefaultAndroidDtDir("/proc/device-tree/firmware/android"); |
| |
| struct fs_mgr_flag_values { |
| char *key_loc; |
| char* key_dir; |
| char *verity_loc; |
| char *sysfs_path; |
| long long part_length; |
| char *label; |
| int partnum; |
| int swap_prio; |
| int max_comp_streams; |
| unsigned int zram_size; |
| uint64_t reserved_size; |
| unsigned int file_contents_mode; |
| unsigned int file_names_mode; |
| unsigned int erase_blk_size; |
| unsigned int logical_blk_size; |
| }; |
| |
| struct flag_list { |
| const char *name; |
| unsigned int flag; |
| }; |
| |
| static struct flag_list mount_flags[] = { |
| { "noatime", MS_NOATIME }, |
| { "noexec", MS_NOEXEC }, |
| { "nosuid", MS_NOSUID }, |
| { "nodev", MS_NODEV }, |
| { "nodiratime", MS_NODIRATIME }, |
| { "ro", MS_RDONLY }, |
| { "rw", 0 }, |
| { "remount", MS_REMOUNT }, |
| { "bind", MS_BIND }, |
| { "rec", MS_REC }, |
| { "unbindable", MS_UNBINDABLE }, |
| { "private", MS_PRIVATE }, |
| { "slave", MS_SLAVE }, |
| { "shared", MS_SHARED }, |
| { "defaults", 0 }, |
| { 0, 0 }, |
| }; |
| |
| static struct flag_list fs_mgr_flags[] = { |
| {"wait", MF_WAIT}, |
| {"check", MF_CHECK}, |
| {"encryptable=", MF_CRYPT}, |
| {"forceencrypt=", MF_FORCECRYPT}, |
| {"fileencryption=", MF_FILEENCRYPTION}, |
| {"forcefdeorfbe=", MF_FORCEFDEORFBE}, |
| {"keydirectory=", MF_KEYDIRECTORY}, |
| {"nonremovable", MF_NONREMOVABLE}, |
| {"voldmanaged=", MF_VOLDMANAGED}, |
| {"length=", MF_LENGTH}, |
| {"recoveryonly", MF_RECOVERYONLY}, |
| {"swapprio=", MF_SWAPPRIO}, |
| {"zramsize=", MF_ZRAMSIZE}, |
| {"max_comp_streams=", MF_MAX_COMP_STREAMS}, |
| {"verifyatboot", MF_VERIFYATBOOT}, |
| {"verify", MF_VERIFY}, |
| {"avb", MF_AVB}, |
| {"noemulatedsd", MF_NOEMULATEDSD}, |
| {"notrim", MF_NOTRIM}, |
| {"formattable", MF_FORMATTABLE}, |
| {"slotselect", MF_SLOTSELECT}, |
| {"nofail", MF_NOFAIL}, |
| {"latemount", MF_LATEMOUNT}, |
| {"reservedsize=", MF_RESERVEDSIZE}, |
| {"quota", MF_QUOTA}, |
| {"eraseblk=", MF_ERASEBLKSIZE}, |
| {"logicalblk=", MF_LOGICALBLKSIZE}, |
| {"sysfs_path=", MF_SYSFS}, |
| {"defaults", 0}, |
| {"logical", MF_LOGICAL}, |
| {"checkpoint=block", MF_CHECKPOINT_BLK}, |
| {"checkpoint=fs", MF_CHECKPOINT_FS}, |
| {0, 0}, |
| }; |
| |
| #define EM_AES_256_XTS 1 |
| #define EM_ICE 2 |
| #define EM_AES_256_CTS 3 |
| #define EM_AES_256_HEH 4 |
| |
| static const struct flag_list file_contents_encryption_modes[] = { |
| {"aes-256-xts", EM_AES_256_XTS}, |
| {"software", EM_AES_256_XTS}, /* alias for backwards compatibility */ |
| {"ice", EM_ICE}, /* hardware-specific inline cryptographic engine */ |
| {0, 0}, |
| }; |
| |
| static const struct flag_list file_names_encryption_modes[] = { |
| {"aes-256-cts", EM_AES_256_CTS}, |
| {"aes-256-heh", EM_AES_256_HEH}, |
| {0, 0}, |
| }; |
| |
| static unsigned int encryption_mode_to_flag(const struct flag_list *list, |
| const char *mode, const char *type) |
| { |
| const struct flag_list *j; |
| |
| for (j = list; j->name; ++j) { |
| if (!strcmp(mode, j->name)) { |
| return j->flag; |
| } |
| } |
| LERROR << "Unknown " << type << " encryption mode: " << mode; |
| return 0; |
| } |
| |
| static const char *flag_to_encryption_mode(const struct flag_list *list, |
| unsigned int flag) |
| { |
| const struct flag_list *j; |
| |
| for (j = list; j->name; ++j) { |
| if (flag == j->flag) { |
| return j->name; |
| } |
| } |
| return nullptr; |
| } |
| |
| static uint64_t calculate_zram_size(unsigned int percentage) |
| { |
| uint64_t total; |
| |
| total = sysconf(_SC_PHYS_PAGES); |
| total *= percentage; |
| total /= 100; |
| |
| total *= sysconf(_SC_PAGESIZE); |
| |
| return total; |
| } |
| |
| static uint64_t parse_size(const char *arg) |
| { |
| char *endptr; |
| uint64_t size = strtoull(arg, &endptr, 10); |
| if (*endptr == 'k' || *endptr == 'K') |
| size *= 1024LL; |
| else if (*endptr == 'm' || *endptr == 'M') |
| size *= 1024LL * 1024LL; |
| else if (*endptr == 'g' || *endptr == 'G') |
| size *= 1024LL * 1024LL * 1024LL; |
| |
| return size; |
| } |
| |
| /* fills 'dt_value' with the underlying device tree value string without |
| * the trailing '\0'. Returns true if 'dt_value' has a valid string, 'false' |
| * otherwise. |
| */ |
| static bool read_dt_file(const std::string& file_name, std::string* dt_value) |
| { |
| if (android::base::ReadFileToString(file_name, dt_value)) { |
| if (!dt_value->empty()) { |
| // trim the trailing '\0' out, otherwise the comparison |
| // will produce false-negatives. |
| dt_value->resize(dt_value->size() - 1); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static int parse_flags(char *flags, struct flag_list *fl, |
| struct fs_mgr_flag_values *flag_vals, |
| char *fs_options, int fs_options_len) |
| { |
| int f = 0; |
| int i; |
| char *p; |
| char *savep; |
| |
| /* initialize flag values. If we find a relevant flag, we'll |
| * update the value */ |
| if (flag_vals) { |
| memset(flag_vals, 0, sizeof(*flag_vals)); |
| flag_vals->partnum = -1; |
| flag_vals->swap_prio = -1; /* negative means it wasn't specified. */ |
| } |
| |
| /* initialize fs_options to the null string */ |
| if (fs_options && (fs_options_len > 0)) { |
| fs_options[0] = '\0'; |
| } |
| |
| p = strtok_r(flags, ",", &savep); |
| while (p) { |
| /* Look for the flag "p" in the flag list "fl" |
| * If not found, the loop exits with fl[i].name being null. |
| */ |
| for (i = 0; fl[i].name; i++) { |
| auto name = fl[i].name; |
| auto len = strlen(name); |
| auto end = len; |
| if (name[end - 1] == '=') --end; |
| if (!strncmp(p, name, len) && (p[end] == name[end])) { |
| f |= fl[i].flag; |
| if (!flag_vals) break; |
| if (p[end] != '=') break; |
| char* arg = p + end + 1; |
| auto flag = fl[i].flag; |
| if (flag == MF_CRYPT) { |
| /* The encryptable flag is followed by an = and the |
| * location of the keys. Get it and return it. |
| */ |
| flag_vals->key_loc = strdup(arg); |
| } else if (flag == MF_VERIFY) { |
| /* If the verify flag is followed by an = and the |
| * location for the verity state, get it and return it. |
| */ |
| flag_vals->verity_loc = strdup(arg); |
| } else if (flag == MF_FORCECRYPT) { |
| /* The forceencrypt flag is followed by an = and the |
| * location of the keys. Get it and return it. |
| */ |
| flag_vals->key_loc = strdup(arg); |
| } else if (flag == MF_FORCEFDEORFBE) { |
| /* The forcefdeorfbe flag is followed by an = and the |
| * location of the keys. Get it and return it. |
| */ |
| flag_vals->key_loc = strdup(arg); |
| flag_vals->file_contents_mode = EM_AES_256_XTS; |
| flag_vals->file_names_mode = EM_AES_256_CTS; |
| } else if (flag == MF_FILEENCRYPTION) { |
| /* The fileencryption flag is followed by an = and |
| * the mode of contents encryption, then optionally a |
| * : and the mode of filenames encryption (defaults |
| * to aes-256-cts). Get it and return it. |
| */ |
| auto mode = arg; |
| auto colon = strchr(mode, ':'); |
| if (colon) { |
| *colon = '\0'; |
| } |
| flag_vals->file_contents_mode = |
| encryption_mode_to_flag(file_contents_encryption_modes, |
| mode, "file contents"); |
| if (colon) { |
| flag_vals->file_names_mode = |
| encryption_mode_to_flag(file_names_encryption_modes, |
| colon + 1, "file names"); |
| } else { |
| flag_vals->file_names_mode = EM_AES_256_CTS; |
| } |
| } else if (flag == MF_KEYDIRECTORY) { |
| /* The metadata flag is followed by an = and the |
| * directory for the keys. Get it and return it. |
| */ |
| flag_vals->key_dir = strdup(arg); |
| } else if (flag == MF_LENGTH) { |
| /* The length flag is followed by an = and the |
| * size of the partition. Get it and return it. |
| */ |
| flag_vals->part_length = strtoll(arg, NULL, 0); |
| } else if (flag == MF_VOLDMANAGED) { |
| /* The voldmanaged flag is followed by an = and the |
| * label, a colon and the partition number or the |
| * word "auto", e.g. |
| * voldmanaged=sdcard:3 |
| * Get and return them. |
| */ |
| auto label_start = arg; |
| auto label_end = strchr(label_start, ':'); |
| |
| if (label_end) { |
| flag_vals->label = strndup(label_start, |
| (int) (label_end - label_start)); |
| auto part_start = label_end + 1; |
| if (!strcmp(part_start, "auto")) { |
| flag_vals->partnum = -1; |
| } else { |
| flag_vals->partnum = strtol(part_start, NULL, 0); |
| } |
| } else { |
| LERROR << "Warning: voldmanaged= flag malformed"; |
| } |
| } else if (flag == MF_SWAPPRIO) { |
| flag_vals->swap_prio = strtoll(arg, NULL, 0); |
| } else if (flag == MF_MAX_COMP_STREAMS) { |
| flag_vals->max_comp_streams = strtoll(arg, NULL, 0); |
| } else if (flag == MF_ZRAMSIZE) { |
| auto is_percent = !!strrchr(arg, '%'); |
| auto val = strtoll(arg, NULL, 0); |
| if (is_percent) |
| flag_vals->zram_size = calculate_zram_size(val); |
| else |
| flag_vals->zram_size = val; |
| } else if (flag == MF_RESERVEDSIZE) { |
| /* The reserved flag is followed by an = and the |
| * reserved size of the partition. Get it and return it. |
| */ |
| flag_vals->reserved_size = parse_size(arg); |
| } else if (flag == MF_ERASEBLKSIZE) { |
| /* The erase block size flag is followed by an = and the flash |
| * erase block size. Get it, check that it is a power of 2 and |
| * at least 4096, and return it. |
| */ |
| auto val = strtoul(arg, NULL, 0); |
| if (val >= 4096 && (val & (val - 1)) == 0) |
| flag_vals->erase_blk_size = val; |
| } else if (flag == MF_LOGICALBLKSIZE) { |
| /* The logical block size flag is followed by an = and the flash |
| * logical block size. Get it, check that it is a power of 2 and |
| * at least 4096, and return it. |
| */ |
| auto val = strtoul(arg, NULL, 0); |
| if (val >= 4096 && (val & (val - 1)) == 0) |
| flag_vals->logical_blk_size = val; |
| } else if (flag == MF_SYSFS) { |
| /* The path to trigger device gc by idle-maint of vold. */ |
| flag_vals->sysfs_path = strdup(arg); |
| } |
| break; |
| } |
| } |
| |
| if (!fl[i].name) { |
| if (fs_options) { |
| /* It's not a known flag, so it must be a filesystem specific |
| * option. Add it to fs_options if it was passed in. |
| */ |
| strlcat(fs_options, p, fs_options_len); |
| strlcat(fs_options, ",", fs_options_len); |
| } else { |
| /* fs_options was not passed in, so if the flag is unknown |
| * it's an error. |
| */ |
| LERROR << "Warning: unknown flag " << p; |
| } |
| } |
| p = strtok_r(NULL, ",", &savep); |
| } |
| |
| if (fs_options && fs_options[0]) { |
| /* remove the last trailing comma from the list of options */ |
| fs_options[strlen(fs_options) - 1] = '\0'; |
| } |
| |
| return f; |
| } |
| |
| static std::string init_android_dt_dir() { |
| std::string android_dt_dir; |
| // The platform may specify a custom Android DT path in kernel cmdline |
| if (!fs_mgr_get_boot_config_from_kernel_cmdline("android_dt_dir", &android_dt_dir)) { |
| // Fall back to the standard procfs-based path |
| android_dt_dir = kDefaultAndroidDtDir; |
| } |
| return android_dt_dir; |
| } |
| |
| // FIXME: The same logic is duplicated in system/core/init/ |
| const std::string& get_android_dt_dir() { |
| // Set once and saves time for subsequent calls to this function |
| static const std::string kAndroidDtDir = init_android_dt_dir(); |
| return kAndroidDtDir; |
| } |
| |
| static bool is_dt_fstab_compatible() { |
| std::string dt_value; |
| std::string file_name = get_android_dt_dir() + "/fstab/compatible"; |
| if (read_dt_file(file_name, &dt_value)) { |
| if (dt_value == "android,fstab") { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static std::string read_fstab_from_dt() { |
| if (!is_dt_compatible() || !is_dt_fstab_compatible()) { |
| return {}; |
| } |
| |
| std::string fstabdir_name = get_android_dt_dir() + "/fstab"; |
| std::unique_ptr<DIR, int (*)(DIR*)> fstabdir(opendir(fstabdir_name.c_str()), closedir); |
| if (!fstabdir) return {}; |
| |
| dirent* dp; |
| // Each element in fstab_dt_entries is <mount point, the line format in fstab file>. |
| std::vector<std::pair<std::string, std::string>> fstab_dt_entries; |
| while ((dp = readdir(fstabdir.get())) != NULL) { |
| // skip over name, compatible and . |
| if (dp->d_type != DT_DIR || dp->d_name[0] == '.') continue; |
| |
| // create <dev> <mnt_point> <type> <mnt_flags> <fsmgr_flags>\n |
| std::vector<std::string> fstab_entry; |
| std::string file_name; |
| std::string value; |
| // skip a partition entry if the status property is present and not set to ok |
| file_name = android::base::StringPrintf("%s/%s/status", fstabdir_name.c_str(), dp->d_name); |
| if (read_dt_file(file_name, &value)) { |
| if (value != "okay" && value != "ok") { |
| LINFO << "dt_fstab: Skip disabled entry for partition " << dp->d_name; |
| continue; |
| } |
| } |
| |
| file_name = android::base::StringPrintf("%s/%s/dev", fstabdir_name.c_str(), dp->d_name); |
| if (!read_dt_file(file_name, &value)) { |
| LERROR << "dt_fstab: Failed to find device for partition " << dp->d_name; |
| return {}; |
| } |
| fstab_entry.push_back(value); |
| |
| std::string mount_point; |
| file_name = |
| android::base::StringPrintf("%s/%s/mnt_point", fstabdir_name.c_str(), dp->d_name); |
| if (read_dt_file(file_name, &value)) { |
| LINFO << "dt_fstab: Using a specified mount point " << value << " for " << dp->d_name; |
| mount_point = value; |
| } else { |
| mount_point = android::base::StringPrintf("/%s", dp->d_name); |
| } |
| fstab_entry.push_back(mount_point); |
| |
| file_name = android::base::StringPrintf("%s/%s/type", fstabdir_name.c_str(), dp->d_name); |
| if (!read_dt_file(file_name, &value)) { |
| LERROR << "dt_fstab: Failed to find type for partition " << dp->d_name; |
| return {}; |
| } |
| fstab_entry.push_back(value); |
| |
| file_name = android::base::StringPrintf("%s/%s/mnt_flags", fstabdir_name.c_str(), dp->d_name); |
| if (!read_dt_file(file_name, &value)) { |
| LERROR << "dt_fstab: Failed to find type for partition " << dp->d_name; |
| return {}; |
| } |
| fstab_entry.push_back(value); |
| |
| file_name = android::base::StringPrintf("%s/%s/fsmgr_flags", fstabdir_name.c_str(), dp->d_name); |
| if (!read_dt_file(file_name, &value)) { |
| LERROR << "dt_fstab: Failed to find type for partition " << dp->d_name; |
| return {}; |
| } |
| fstab_entry.push_back(value); |
| // Adds a fstab_entry to fstab_dt_entries, to be sorted by mount_point later. |
| fstab_dt_entries.emplace_back(mount_point, android::base::Join(fstab_entry, " ")); |
| } |
| |
| // Sort fstab_dt entries, to ensure /vendor is mounted before /vendor/abc is attempted. |
| std::sort(fstab_dt_entries.begin(), fstab_dt_entries.end(), |
| [](const auto& a, const auto& b) { return a.first < b.first; }); |
| |
| std::string fstab_result; |
| for (const auto& [_, dt_entry] : fstab_dt_entries) { |
| fstab_result += dt_entry + "\n"; |
| } |
| return fstab_result; |
| } |
| |
| bool is_dt_compatible() { |
| std::string file_name = get_android_dt_dir() + "/compatible"; |
| std::string dt_value; |
| if (read_dt_file(file_name, &dt_value)) { |
| if (dt_value == "android,firmware") { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static struct fstab* fs_mgr_read_fstab_file(FILE* fstab_file, bool proc_mounts) { |
| int cnt, entries; |
| ssize_t len; |
| size_t alloc_len = 0; |
| char *line = NULL; |
| const char *delim = " \t"; |
| char *save_ptr, *p; |
| struct fstab *fstab = NULL; |
| struct fs_mgr_flag_values flag_vals; |
| #define FS_OPTIONS_LEN 1024 |
| char tmp_fs_options[FS_OPTIONS_LEN]; |
| |
| entries = 0; |
| while ((len = getline(&line, &alloc_len, fstab_file)) != -1) { |
| /* if the last character is a newline, shorten the string by 1 byte */ |
| if (line[len - 1] == '\n') { |
| line[len - 1] = '\0'; |
| } |
| /* Skip any leading whitespace */ |
| p = line; |
| while (isspace(*p)) { |
| p++; |
| } |
| /* ignore comments or empty lines */ |
| if (*p == '#' || *p == '\0') |
| continue; |
| entries++; |
| } |
| |
| if (!entries) { |
| LERROR << "No entries found in fstab"; |
| goto err; |
| } |
| |
| /* Allocate and init the fstab structure */ |
| fstab = static_cast<struct fstab *>(calloc(1, sizeof(struct fstab))); |
| fstab->num_entries = entries; |
| fstab->recs = static_cast<struct fstab_rec *>( |
| calloc(fstab->num_entries, sizeof(struct fstab_rec))); |
| |
| fseek(fstab_file, 0, SEEK_SET); |
| |
| cnt = 0; |
| while ((len = getline(&line, &alloc_len, fstab_file)) != -1) { |
| /* if the last character is a newline, shorten the string by 1 byte */ |
| if (line[len - 1] == '\n') { |
| line[len - 1] = '\0'; |
| } |
| |
| /* Skip any leading whitespace */ |
| p = line; |
| while (isspace(*p)) { |
| p++; |
| } |
| /* ignore comments or empty lines */ |
| if (*p == '#' || *p == '\0') |
| continue; |
| |
| /* If a non-comment entry is greater than the size we allocated, give an |
| * error and quit. This can happen in the unlikely case the file changes |
| * between the two reads. |
| */ |
| if (cnt >= entries) { |
| LERROR << "Tried to process more entries than counted"; |
| break; |
| } |
| |
| if (!(p = strtok_r(line, delim, &save_ptr))) { |
| LERROR << "Error parsing mount source"; |
| goto err; |
| } |
| fstab->recs[cnt].blk_device = strdup(p); |
| |
| if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| LERROR << "Error parsing mount_point"; |
| goto err; |
| } |
| fstab->recs[cnt].mount_point = strdup(p); |
| |
| if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| LERROR << "Error parsing fs_type"; |
| goto err; |
| } |
| fstab->recs[cnt].fs_type = strdup(p); |
| |
| if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| LERROR << "Error parsing mount_flags"; |
| goto err; |
| } |
| tmp_fs_options[0] = '\0'; |
| fstab->recs[cnt].flags = parse_flags(p, mount_flags, NULL, |
| tmp_fs_options, FS_OPTIONS_LEN); |
| |
| /* fs_options are optional */ |
| if (tmp_fs_options[0]) { |
| fstab->recs[cnt].fs_options = strdup(tmp_fs_options); |
| } else { |
| fstab->recs[cnt].fs_options = NULL; |
| } |
| |
| // For /proc/mounts, ignore everything after mnt_freq and mnt_passno |
| if (proc_mounts) { |
| p += strlen(p); |
| } else if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| LERROR << "Error parsing fs_mgr_options"; |
| goto err; |
| } |
| fstab->recs[cnt].fs_mgr_flags = parse_flags(p, fs_mgr_flags, |
| &flag_vals, NULL, 0); |
| fstab->recs[cnt].key_loc = flag_vals.key_loc; |
| fstab->recs[cnt].key_dir = flag_vals.key_dir; |
| fstab->recs[cnt].verity_loc = flag_vals.verity_loc; |
| fstab->recs[cnt].length = flag_vals.part_length; |
| fstab->recs[cnt].label = flag_vals.label; |
| fstab->recs[cnt].partnum = flag_vals.partnum; |
| fstab->recs[cnt].swap_prio = flag_vals.swap_prio; |
| fstab->recs[cnt].max_comp_streams = flag_vals.max_comp_streams; |
| fstab->recs[cnt].zram_size = flag_vals.zram_size; |
| fstab->recs[cnt].reserved_size = flag_vals.reserved_size; |
| fstab->recs[cnt].file_contents_mode = flag_vals.file_contents_mode; |
| fstab->recs[cnt].file_names_mode = flag_vals.file_names_mode; |
| fstab->recs[cnt].erase_blk_size = flag_vals.erase_blk_size; |
| fstab->recs[cnt].logical_blk_size = flag_vals.logical_blk_size; |
| fstab->recs[cnt].sysfs_path = flag_vals.sysfs_path; |
| if (fstab->recs[cnt].fs_mgr_flags & MF_LOGICAL) { |
| fstab->recs[cnt].logical_partition_name = strdup(fstab->recs[cnt].blk_device); |
| } |
| |
| cnt++; |
| } |
| /* If an A/B partition, modify block device to be the real block device */ |
| if (!fs_mgr_update_for_slotselect(fstab)) { |
| LERROR << "Error updating for slotselect"; |
| goto err; |
| } |
| free(line); |
| return fstab; |
| |
| err: |
| free(line); |
| if (fstab) |
| fs_mgr_free_fstab(fstab); |
| return NULL; |
| } |
| |
| /* merges fstab entries from both a and b, then returns the merged result. |
| * note that the caller should only manage the return pointer without |
| * doing further memory management for the two inputs, i.e. only need to |
| * frees up memory of the return value without touching a and b. */ |
| static struct fstab *in_place_merge(struct fstab *a, struct fstab *b) |
| { |
| if (!a && !b) return nullptr; |
| if (!a) return b; |
| if (!b) return a; |
| |
| int total_entries = a->num_entries + b->num_entries; |
| a->recs = static_cast<struct fstab_rec *>(realloc( |
| a->recs, total_entries * (sizeof(struct fstab_rec)))); |
| if (!a->recs) { |
| LERROR << __FUNCTION__ << "(): failed to allocate fstab recs"; |
| // If realloc() fails the original block is left untouched; |
| // it is not freed or moved. So we have to free both a and b here. |
| fs_mgr_free_fstab(a); |
| fs_mgr_free_fstab(b); |
| return nullptr; |
| } |
| |
| for (int i = a->num_entries, j = 0; i < total_entries; i++, j++) { |
| // Copy the structs by assignment. |
| a->recs[i] = b->recs[j]; |
| } |
| |
| // We can't call fs_mgr_free_fstab because a->recs still references the |
| // memory allocated by strdup. |
| free(b->recs); |
| free(b); |
| |
| a->num_entries = total_entries; |
| return a; |
| } |
| |
| /* Extracts <device>s from the by-name symlinks specified in a fstab: |
| * /dev/block/<type>/<device>/by-name/<partition> |
| * |
| * <type> can be: platform, pci or vbd. |
| * |
| * For example, given the following entries in the input fstab: |
| * /dev/block/platform/soc/1da4000.ufshc/by-name/system |
| * /dev/block/pci/soc.0/f9824900.sdhci/by-name/vendor |
| * it returns a set { "soc/1da4000.ufshc", "soc.0/f9824900.sdhci" }. |
| */ |
| static std::set<std::string> extract_boot_devices(const fstab& fstab) { |
| std::set<std::string> boot_devices; |
| |
| for (int i = 0; i < fstab.num_entries; i++) { |
| std::string blk_device(fstab.recs[i].blk_device); |
| // Skips blk_device that doesn't conform to the format. |
| if (!android::base::StartsWith(blk_device, "/dev/block") || |
| android::base::StartsWith(blk_device, "/dev/block/by-name") || |
| android::base::StartsWith(blk_device, "/dev/block/bootdevice/by-name")) { |
| continue; |
| } |
| // Skips non-by_name blk_device. |
| // /dev/block/<type>/<device>/by-name/<partition> |
| // ^ slash_by_name |
| auto slash_by_name = blk_device.find("/by-name"); |
| if (slash_by_name == std::string::npos) continue; |
| blk_device.erase(slash_by_name); // erases /by-name/<partition> |
| |
| // Erases /dev/block/, now we have <type>/<device> |
| blk_device.erase(0, std::string("/dev/block/").size()); |
| |
| // <type>/<device> |
| // ^ first_slash |
| auto first_slash = blk_device.find('/'); |
| if (first_slash == std::string::npos) continue; |
| |
| auto boot_device = blk_device.substr(first_slash + 1); |
| if (!boot_device.empty()) boot_devices.insert(std::move(boot_device)); |
| } |
| |
| return boot_devices; |
| } |
| |
| struct fstab *fs_mgr_read_fstab(const char *fstab_path) |
| { |
| FILE *fstab_file; |
| struct fstab *fstab; |
| |
| fstab_file = fopen(fstab_path, "r"); |
| if (!fstab_file) { |
| PERROR << __FUNCTION__<< "(): cannot open file: '" << fstab_path << "'"; |
| return nullptr; |
| } |
| |
| fstab = fs_mgr_read_fstab_file(fstab_file, !strcmp("/proc/mounts", fstab_path)); |
| if (!fstab) { |
| LERROR << __FUNCTION__ << "(): failed to load fstab from : '" << fstab_path << "'"; |
| } |
| |
| fclose(fstab_file); |
| return fstab; |
| } |
| |
| /* Returns fstab entries parsed from the device tree if they |
| * exist |
| */ |
| struct fstab *fs_mgr_read_fstab_dt() |
| { |
| std::string fstab_buf = read_fstab_from_dt(); |
| if (fstab_buf.empty()) { |
| LINFO << __FUNCTION__ << "(): failed to read fstab from dt"; |
| return nullptr; |
| } |
| |
| std::unique_ptr<FILE, decltype(&fclose)> fstab_file( |
| fmemopen(static_cast<void*>(const_cast<char*>(fstab_buf.c_str())), |
| fstab_buf.length(), "r"), fclose); |
| if (!fstab_file) { |
| PERROR << __FUNCTION__ << "(): failed to create a file stream for fstab dt"; |
| return nullptr; |
| } |
| |
| struct fstab* fstab = fs_mgr_read_fstab_file(fstab_file.get(), false); |
| if (!fstab) { |
| LERROR << __FUNCTION__ << "(): failed to load fstab from kernel:" |
| << std::endl << fstab_buf; |
| } |
| |
| return fstab; |
| } |
| |
| /* |
| * Identify path to fstab file. Lookup is based on pattern |
| * fstab.<hardware>, fstab.<hardware.platform> in folders |
| /odm/etc, vendor/etc, or /. |
| */ |
| static std::string get_fstab_path() |
| { |
| for (const char* prop : {"hardware", "hardware.platform"}) { |
| std::string hw; |
| |
| if (!fs_mgr_get_boot_config(prop, &hw)) continue; |
| |
| for (const char* prefix : {"/odm/etc/fstab.", "/vendor/etc/fstab.", "/fstab."}) { |
| std::string fstab_path = prefix + hw; |
| if (access(fstab_path.c_str(), F_OK) == 0) { |
| return fstab_path; |
| } |
| } |
| } |
| |
| return std::string(); |
| } |
| |
| /* |
| * loads the fstab file and combines with fstab entries passed in from device tree. |
| */ |
| struct fstab *fs_mgr_read_fstab_default() |
| { |
| std::string default_fstab; |
| |
| // Use different fstab paths for normal boot and recovery boot, respectively |
| if (access("/system/bin/recovery", F_OK) == 0) { |
| default_fstab = "/etc/recovery.fstab"; |
| } else { // normal boot |
| default_fstab = get_fstab_path(); |
| } |
| |
| struct fstab* fstab = nullptr; |
| if (!default_fstab.empty()) { |
| fstab = fs_mgr_read_fstab(default_fstab.c_str()); |
| } else { |
| LINFO << __FUNCTION__ << "(): failed to find device default fstab"; |
| } |
| |
| struct fstab* fstab_dt = fs_mgr_read_fstab_dt(); |
| |
| // combines fstab entries passed in from device tree with |
| // the ones found from default_fstab file |
| return in_place_merge(fstab_dt, fstab); |
| } |
| |
| void fs_mgr_free_fstab(struct fstab *fstab) |
| { |
| int i; |
| |
| if (!fstab) { |
| return; |
| } |
| |
| for (i = 0; i < fstab->num_entries; i++) { |
| /* Free the pointers return by strdup(3) */ |
| free(fstab->recs[i].blk_device); |
| free(fstab->recs[i].logical_partition_name); |
| free(fstab->recs[i].mount_point); |
| free(fstab->recs[i].fs_type); |
| free(fstab->recs[i].fs_options); |
| free(fstab->recs[i].key_loc); |
| free(fstab->recs[i].key_dir); |
| free(fstab->recs[i].label); |
| free(fstab->recs[i].sysfs_path); |
| } |
| |
| /* Free the fstab_recs array created by calloc(3) */ |
| free(fstab->recs); |
| |
| /* Free fstab */ |
| free(fstab); |
| } |
| |
| /* Add an entry to the fstab, and return 0 on success or -1 on error */ |
| int fs_mgr_add_entry(struct fstab *fstab, |
| const char *mount_point, const char *fs_type, |
| const char *blk_device) |
| { |
| struct fstab_rec *new_fstab_recs; |
| int n = fstab->num_entries; |
| |
| new_fstab_recs = (struct fstab_rec *) |
| realloc(fstab->recs, sizeof(struct fstab_rec) * (n + 1)); |
| |
| if (!new_fstab_recs) { |
| return -1; |
| } |
| |
| /* A new entry was added, so initialize it */ |
| memset(&new_fstab_recs[n], 0, sizeof(struct fstab_rec)); |
| new_fstab_recs[n].mount_point = strdup(mount_point); |
| new_fstab_recs[n].fs_type = strdup(fs_type); |
| new_fstab_recs[n].blk_device = strdup(blk_device); |
| new_fstab_recs[n].length = 0; |
| |
| /* Update the fstab struct */ |
| fstab->recs = new_fstab_recs; |
| fstab->num_entries++; |
| |
| return 0; |
| } |
| |
| /* |
| * Returns the fstab_rec* whose mount_point is path. |
| * Returns nullptr if not found. |
| */ |
| struct fstab_rec* fs_mgr_get_entry_for_mount_point(struct fstab* fstab, const std::string& path) { |
| if (!fstab) { |
| return nullptr; |
| } |
| for (int i = 0; i < fstab->num_entries; i++) { |
| if (fstab->recs[i].mount_point && path == fstab->recs[i].mount_point) { |
| return &fstab->recs[i]; |
| } |
| } |
| return nullptr; |
| } |
| |
| std::set<std::string> fs_mgr_get_boot_devices() { |
| // boot_devices can be specified in device tree. |
| std::string dt_value; |
| std::string file_name = get_android_dt_dir() + "/boot_devices"; |
| if (read_dt_file(file_name, &dt_value)) { |
| auto boot_devices = android::base::Split(dt_value, ","); |
| return std::set<std::string>(boot_devices.begin(), boot_devices.end()); |
| } |
| |
| // Fallback to extract boot devices from fstab. |
| std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_default(), |
| fs_mgr_free_fstab); |
| if (fstab) return extract_boot_devices(*fstab); |
| |
| return {}; |
| } |
| |
| int fs_mgr_is_voldmanaged(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_VOLDMANAGED; |
| } |
| |
| int fs_mgr_is_nonremovable(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_NONREMOVABLE; |
| } |
| |
| int fs_mgr_is_verified(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_VERIFY; |
| } |
| |
| int fs_mgr_is_avb(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_AVB; |
| } |
| |
| int fs_mgr_is_verifyatboot(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_VERIFYATBOOT; |
| } |
| |
| int fs_mgr_is_encryptable(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & (MF_CRYPT | MF_FORCECRYPT | MF_FORCEFDEORFBE); |
| } |
| |
| int fs_mgr_is_file_encrypted(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_FILEENCRYPTION; |
| } |
| |
| void fs_mgr_get_file_encryption_modes(const struct fstab_rec *fstab, |
| const char **contents_mode_ret, |
| const char **filenames_mode_ret) |
| { |
| *contents_mode_ret = flag_to_encryption_mode(file_contents_encryption_modes, |
| fstab->file_contents_mode); |
| *filenames_mode_ret = flag_to_encryption_mode(file_names_encryption_modes, |
| fstab->file_names_mode); |
| } |
| |
| int fs_mgr_is_convertible_to_fbe(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_FORCEFDEORFBE; |
| } |
| |
| int fs_mgr_is_noemulatedsd(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_NOEMULATEDSD; |
| } |
| |
| int fs_mgr_is_notrim(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_NOTRIM; |
| } |
| |
| int fs_mgr_is_formattable(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & (MF_FORMATTABLE); |
| } |
| |
| int fs_mgr_is_slotselect(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_SLOTSELECT; |
| } |
| |
| int fs_mgr_is_nofail(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_NOFAIL; |
| } |
| |
| int fs_mgr_is_latemount(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_LATEMOUNT; |
| } |
| |
| int fs_mgr_is_quota(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_QUOTA; |
| } |
| |
| int fs_mgr_has_sysfs_path(const struct fstab_rec *fstab) |
| { |
| return fstab->fs_mgr_flags & MF_SYSFS; |
| } |
| |
| int fs_mgr_is_logical(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_LOGICAL; |
| } |
| |
| int fs_mgr_is_checkpoint(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & (MF_CHECKPOINT_FS | MF_CHECKPOINT_BLK); |
| } |
| |
| int fs_mgr_is_checkpoint_fs(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_CHECKPOINT_FS; |
| } |
| |
| int fs_mgr_is_checkpoint_blk(const struct fstab_rec* fstab) { |
| return fstab->fs_mgr_flags & MF_CHECKPOINT_BLK; |
| } |
