diff options
Diffstat (limited to '')
| -rw-r--r-- | roots.cpp | 482 |
1 files changed, 248 insertions, 234 deletions
@@ -16,174 +16,208 @@ #include "roots.h" -#include <errno.h> +#include <ctype.h> +#include <fcntl.h> +#include <stdint.h> #include <stdlib.h> +#include <string.h> #include <sys/mount.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> -#include <ctype.h> -#include <fcntl.h> + +#include <algorithm> +#include <string> +#include <vector> #include <android-base/logging.h> #include <android-base/properties.h> #include <android-base/stringprintf.h> #include <android-base/unique_fd.h> +#include <cryptfs.h> #include <ext4_utils/wipe.h> #include <fs_mgr.h> -#include "common.h" #include "mounts.h" -#include "cryptfs.h" -static struct fstab *fstab = NULL; +static struct fstab* fstab = nullptr; -extern struct selabel_handle *sehandle; +extern struct selabel_handle* sehandle; -void load_volume_table() -{ - int i; - int ret; +void load_volume_table() { + fstab = fs_mgr_read_fstab_default(); + if (!fstab) { + LOG(ERROR) << "Failed to read default fstab"; + return; + } - fstab = fs_mgr_read_fstab_default(); - if (!fstab) { - LOG(ERROR) << "failed to read default fstab"; - return; - } + int ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk"); + if (ret == -1) { + LOG(ERROR) << "Failed to add /tmp entry to fstab"; + fs_mgr_free_fstab(fstab); + fstab = nullptr; + return; + } - ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk"); - if (ret < 0 ) { - LOG(ERROR) << "failed to add /tmp entry to fstab"; - fs_mgr_free_fstab(fstab); - fstab = NULL; - return; - } + printf("recovery filesystem table\n"); + printf("=========================\n"); + for (int i = 0; i < fstab->num_entries; ++i) { + const Volume* v = &fstab->recs[i]; + printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type, v->blk_device, v->length); + } + printf("\n"); +} - printf("recovery filesystem table\n"); - printf("=========================\n"); - for (i = 0; i < fstab->num_entries; ++i) { - Volume* v = &fstab->recs[i]; - printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type, - v->blk_device, v->length); - } - printf("\n"); +Volume* volume_for_mount_point(const std::string& mount_point) { + return fs_mgr_get_entry_for_mount_point(fstab, mount_point); } -Volume* volume_for_path(const char* path) { - return fs_mgr_get_entry_for_mount_point(fstab, path); +// Finds the volume specified by the given path. fs_mgr_get_entry_for_mount_point() does exact match +// only, so it attempts the prefixes recursively (e.g. "/cache/recovery/last_log", +// "/cache/recovery", "/cache", "/" for a given path of "/cache/recovery/last_log") and returns the +// first match or nullptr. +static Volume* volume_for_path(const char* path) { + if (path == nullptr || path[0] == '\0') return nullptr; + std::string str(path); + while (true) { + Volume* result = fs_mgr_get_entry_for_mount_point(fstab, str); + if (result != nullptr || str == "/") { + return result; + } + size_t slash = str.find_last_of('/'); + if (slash == std::string::npos) return nullptr; + if (slash == 0) { + str = "/"; + } else { + str = str.substr(0, slash); + } + } + return nullptr; } // Mount the volume specified by path at the given mount_point. int ensure_path_mounted_at(const char* path, const char* mount_point) { - Volume* v = volume_for_path(path); - if (v == NULL) { - LOG(ERROR) << "unknown volume for path [" << path << "]"; - return -1; - } - if (strcmp(v->fs_type, "ramdisk") == 0) { - // the ramdisk is always mounted. - return 0; - } + Volume* v = volume_for_path(path); + if (v == nullptr) { + LOG(ERROR) << "unknown volume for path [" << path << "]"; + return -1; + } + if (strcmp(v->fs_type, "ramdisk") == 0) { + // The ramdisk is always mounted. + return 0; + } - if (!scan_mounted_volumes()) { - LOG(ERROR) << "failed to scan mounted volumes"; - return -1; - } + if (!scan_mounted_volumes()) { + LOG(ERROR) << "Failed to scan mounted volumes"; + return -1; + } - if (!mount_point) { - mount_point = v->mount_point; - } + if (!mount_point) { + mount_point = v->mount_point; + } + + const MountedVolume* mv = find_mounted_volume_by_mount_point(mount_point); + if (mv != nullptr) { + // Volume is already mounted. + return 0; + } - MountedVolume* mv = find_mounted_volume_by_mount_point(mount_point); - if (mv) { - // volume is already mounted - return 0; + mkdir(mount_point, 0755); // in case it doesn't already exist + + if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "squashfs") == 0 || + strcmp(v->fs_type, "vfat") == 0) { + int result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); + if (result == -1 && fs_mgr_is_formattable(v)) { + PLOG(ERROR) << "Failed to mount " << mount_point << "; formatting"; + bool crypt_footer = fs_mgr_is_encryptable(v) && !strcmp(v->key_loc, "footer"); + if (fs_mgr_do_format(v, crypt_footer) == 0) { + result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); + } else { + PLOG(ERROR) << "Failed to format " << mount_point; + return -1; + } } - mkdir(mount_point, 0755); // in case it doesn't already exist - - if (strcmp(v->fs_type, "ext4") == 0 || - strcmp(v->fs_type, "squashfs") == 0 || - strcmp(v->fs_type, "vfat") == 0) { - int result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); - if (result == -1 && fs_mgr_is_formattable(v)) { - LOG(ERROR) << "failed to mount " << mount_point << " (" << strerror(errno) - << ") , formatting....."; - bool crypt_footer = fs_mgr_is_encryptable(v) && !strcmp(v->key_loc, "footer"); - if (fs_mgr_do_format(v, crypt_footer) == 0) { - result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); - } else { - PLOG(ERROR) << "failed to format " << mount_point; - return -1; - } - } - - if (result == -1) { - PLOG(ERROR) << "failed to mount " << mount_point; - return -1; - } - return 0; + if (result == -1) { + PLOG(ERROR) << "Failed to mount " << mount_point; + return -1; } + return 0; + } - LOG(ERROR) << "unknown fs_type \"" << v->fs_type << "\" for " << mount_point; - return -1; + LOG(ERROR) << "unknown fs_type \"" << v->fs_type << "\" for " << mount_point; + return -1; } int ensure_path_mounted(const char* path) { - // Mount at the default mount point. - return ensure_path_mounted_at(path, nullptr); + // Mount at the default mount point. + return ensure_path_mounted_at(path, nullptr); } int ensure_path_unmounted(const char* path) { - Volume* v = volume_for_path(path); - if (v == NULL) { - LOG(ERROR) << "unknown volume for path [" << path << "]"; - return -1; - } - if (strcmp(v->fs_type, "ramdisk") == 0) { - // the ramdisk is always mounted; you can't unmount it. - return -1; - } + const Volume* v = volume_for_path(path); + if (v == nullptr) { + LOG(ERROR) << "unknown volume for path [" << path << "]"; + return -1; + } + if (strcmp(v->fs_type, "ramdisk") == 0) { + // The ramdisk is always mounted; you can't unmount it. + return -1; + } - if (!scan_mounted_volumes()) { - LOG(ERROR) << "failed to scan mounted volumes"; - return -1; - } + if (!scan_mounted_volumes()) { + LOG(ERROR) << "Failed to scan mounted volumes"; + return -1; + } - MountedVolume* mv = find_mounted_volume_by_mount_point(v->mount_point); - if (mv == NULL) { - // volume is already unmounted - return 0; - } + MountedVolume* mv = find_mounted_volume_by_mount_point(v->mount_point); + if (mv == nullptr) { + // Volume is already unmounted. + return 0; + } - return unmount_mounted_volume(mv); + return unmount_mounted_volume(mv); } -static int exec_cmd(const char* path, char* const argv[]) { - int status; - pid_t child; - if ((child = vfork()) == 0) { - execv(path, argv); - _exit(EXIT_FAILURE); - } - waitpid(child, &status, 0); - if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { - LOG(ERROR) << path << " failed with status " << WEXITSTATUS(status); - } - return WEXITSTATUS(status); +static int exec_cmd(const std::vector<std::string>& args) { + CHECK_NE(static_cast<size_t>(0), args.size()); + + std::vector<char*> argv(args.size()); + std::transform(args.cbegin(), args.cend(), argv.begin(), + [](const std::string& arg) { return const_cast<char*>(arg.c_str()); }); + argv.push_back(nullptr); + + pid_t child; + if ((child = vfork()) == 0) { + execv(argv[0], argv.data()); + _exit(EXIT_FAILURE); + } + + int status; + waitpid(child, &status, 0); + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + LOG(ERROR) << args[0] << " failed with status " << WEXITSTATUS(status); + } + return WEXITSTATUS(status); } -static ssize_t get_file_size(int fd, uint64_t reserve_len) { +static int64_t get_file_size(int fd, uint64_t reserve_len) { struct stat buf; int ret = fstat(fd, &buf); if (ret) return 0; - ssize_t computed_size; + int64_t computed_size; if (S_ISREG(buf.st_mode)) { computed_size = buf.st_size - reserve_len; } else if (S_ISBLK(buf.st_mode)) { - computed_size = get_block_device_size(fd) - reserve_len; + uint64_t block_device_size = get_block_device_size(fd); + if (block_device_size < reserve_len || + block_device_size > std::numeric_limits<int64_t>::max()) { + computed_size = 0; + } else { + computed_size = block_device_size - reserve_len; + } } else { computed_size = 0; } @@ -192,136 +226,116 @@ static ssize_t get_file_size(int fd, uint64_t reserve_len) { } int format_volume(const char* volume, const char* directory) { - Volume* v = volume_for_path(volume); - if (v == NULL) { - LOG(ERROR) << "unknown volume \"" << volume << "\""; - return -1; + const Volume* v = volume_for_path(volume); + if (v == nullptr) { + LOG(ERROR) << "unknown volume \"" << volume << "\""; + return -1; + } + if (strcmp(v->fs_type, "ramdisk") == 0) { + LOG(ERROR) << "can't format_volume \"" << volume << "\""; + return -1; + } + if (strcmp(v->mount_point, volume) != 0) { + LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume"; + return -1; + } + if (ensure_path_unmounted(volume) != 0) { + LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\""; + return -1; + } + if (strcmp(v->fs_type, "ext4") != 0 && strcmp(v->fs_type, "f2fs") != 0) { + LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported"; + return -1; + } + + // If there's a key_loc that looks like a path, it should be a block device for storing encryption + // metadata. Wipe it too. + if (v->key_loc != nullptr && v->key_loc[0] == '/') { + LOG(INFO) << "Wiping " << v->key_loc; + int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644); + if (fd == -1) { + PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc; + return -1; } - if (strcmp(v->fs_type, "ramdisk") == 0) { - // you can't format the ramdisk. - LOG(ERROR) << "can't format_volume \"" << volume << "\""; - return -1; + wipe_block_device(fd, get_file_size(fd)); + close(fd); + } + + int64_t length = 0; + if (v->length != 0) { + length = v->length; + } else if (v->key_loc != nullptr && strcmp(v->key_loc, "footer") == 0) { + android::base::unique_fd fd(open(v->blk_device, O_RDONLY)); + if (fd == -1) { + PLOG(ERROR) << "format_volume: failed to open " << v->blk_device; + return -1; } - if (strcmp(v->mount_point, volume) != 0) { - LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume"; - return -1; + length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET); + if (length <= 0) { + LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device; + return -1; } + } - if (ensure_path_unmounted(volume) != 0) { - LOG(ERROR) << "format_volume failed to unmount \"" << v->mount_point << "\""; - return -1; + if (strcmp(v->fs_type, "ext4") == 0) { + static constexpr int kBlockSize = 4096; + std::vector<std::string> mke2fs_args = { + "/sbin/mke2fs_static", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize), + }; + + int raid_stride = v->logical_blk_size / kBlockSize; + int raid_stripe_width = v->erase_blk_size / kBlockSize; + // stride should be the max of 8KB and logical block size + if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) { + raid_stride = 8192 / kBlockSize; + } + if (v->erase_blk_size != 0 && v->logical_blk_size != 0) { + mke2fs_args.push_back("-E"); + mke2fs_args.push_back( + android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, raid_stripe_width)); + } + mke2fs_args.push_back(v->blk_device); + if (length != 0) { + mke2fs_args.push_back(std::to_string(length / kBlockSize)); } - if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "f2fs") == 0) { - // if there's a key_loc that looks like a path, it should be a - // block device for storing encryption metadata. wipe it too. - if (v->key_loc != NULL && v->key_loc[0] == '/') { - LOG(INFO) << "wiping " << v->key_loc; - int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644); - if (fd < 0) { - LOG(ERROR) << "format_volume: failed to open " << v->key_loc; - return -1; - } - wipe_block_device(fd, get_file_size(fd)); - close(fd); - } - - ssize_t length = 0; - if (v->length != 0) { - length = v->length; - } else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) { - android::base::unique_fd fd(open(v->blk_device, O_RDONLY)); - if (fd < 0) { - PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device; - return -1; - } - length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET); - if (length <= 0) { - LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device; - return -1; - } - } - int result; - if (strcmp(v->fs_type, "ext4") == 0) { - static constexpr int block_size = 4096; - int raid_stride = v->logical_blk_size / block_size; - int raid_stripe_width = v->erase_blk_size / block_size; - - // stride should be the max of 8kb and logical block size - if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) { - raid_stride = 8192 / block_size; - } - - const char* mke2fs_argv[] = { "/sbin/mke2fs_static", - "-F", - "-t", - "ext4", - "-b", - nullptr, - nullptr, - nullptr, - nullptr, - nullptr, - nullptr }; - - int i = 5; - std::string block_size_str = std::to_string(block_size); - mke2fs_argv[i++] = block_size_str.c_str(); - - std::string ext_args; - if (v->erase_blk_size != 0 && v->logical_blk_size != 0) { - ext_args = android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, - raid_stripe_width); - mke2fs_argv[i++] = "-E"; - mke2fs_argv[i++] = ext_args.c_str(); - } - - mke2fs_argv[i++] = v->blk_device; - - std::string size_str = std::to_string(length / block_size); - if (length != 0) { - mke2fs_argv[i++] = size_str.c_str(); - } - - result = exec_cmd(mke2fs_argv[0], const_cast<char**>(mke2fs_argv)); - if (result == 0 && directory != nullptr) { - const char* e2fsdroid_argv[] = { "/sbin/e2fsdroid_static", - "-e", - "-f", - directory, - "-a", - volume, - v->blk_device, - nullptr }; - - result = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv)); - } - } else { /* Has to be f2fs because we checked earlier. */ - char *num_sectors = nullptr; - if (length >= 512 && asprintf(&num_sectors, "%zd", length / 512) <= 0) { - LOG(ERROR) << "format_volume: failed to create " << v->fs_type - << " command for " << v->blk_device; - return -1; - } - const char *f2fs_path = "/sbin/mkfs.f2fs"; - const char* const f2fs_argv[] = {"mkfs.f2fs", "-t", "-d1", v->blk_device, num_sectors, nullptr}; - - result = exec_cmd(f2fs_path, (char* const*)f2fs_argv); - free(num_sectors); - } - if (result != 0) { - PLOG(ERROR) << "format_volume: make " << v->fs_type << " failed on " << v->blk_device; - return -1; - } - return 0; + int result = exec_cmd(mke2fs_args); + if (result == 0 && directory != nullptr) { + std::vector<std::string> e2fsdroid_args = { + "/sbin/e2fsdroid_static", + "-e", + "-f", + directory, + "-a", + volume, + v->blk_device, + }; + result = exec_cmd(e2fsdroid_args); } - LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported"; + if (result != 0) { + PLOG(ERROR) << "format_volume: Failed to make ext4 on " << v->blk_device; + return -1; + } + return 0; + } + + // Has to be f2fs because we checked earlier. + std::vector<std::string> f2fs_args = { "/sbin/mkfs.f2fs", "-t", "-d1", v->blk_device }; + if (length >= 512) { + f2fs_args.push_back(std::to_string(length / 512)); + } + + int result = exec_cmd(f2fs_args); + if (result != 0) { + PLOG(ERROR) << "format_volume: Failed to make f2fs on " << v->blk_device; return -1; + } + return 0; } int format_volume(const char* volume) { - return format_volume(volume, NULL); + return format_volume(volume, nullptr); } int setup_install_mounts() { @@ -339,12 +353,12 @@ int setup_install_mounts() { if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) { if (ensure_path_mounted(v->mount_point) != 0) { - LOG(ERROR) << "failed to mount " << v->mount_point; + LOG(ERROR) << "Failed to mount " << v->mount_point; return -1; } } else { if (ensure_path_unmounted(v->mount_point) != 0) { - LOG(ERROR) << "failed to unmount " << v->mount_point; + LOG(ERROR) << "Failed to unmount " << v->mount_point; return -1; } } |