| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <linux/magic.h> |
| #include <sys/vfs.h> |
| |
| #include "sd-device.h" |
| #include "sd-id128.h" |
| |
| #include "alloc-util.h" |
| #include "blkid-util.h" |
| #include "btrfs-util.h" |
| #include "chase-symlinks.h" |
| #include "device-util.h" |
| #include "devnum-util.h" |
| #include "env-util.h" |
| #include "errno-util.h" |
| #include "fd-util.h" |
| #include "find-esp.h" |
| #include "gpt.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "stat-util.h" |
| #include "string-util.h" |
| #include "virt.h" |
| |
| typedef enum VerifyESPFlags { |
| VERIFY_ESP_SEARCHING = 1 << 0, /* Downgrade various "not found" logs to debug level */ |
| VERIFY_ESP_UNPRIVILEGED_MODE = 1 << 1, /* Call into udev rather than blkid */ |
| VERIFY_ESP_RELAX_CHECKS = 1 << 2, /* Do not validate ESP partition */ |
| } VerifyESPFlags; |
| |
| static int verify_esp_blkid( |
| dev_t devid, |
| bool searching, |
| uint32_t *ret_part, |
| uint64_t *ret_pstart, |
| uint64_t *ret_psize, |
| sd_id128_t *ret_uuid) { |
| |
| sd_id128_t uuid = SD_ID128_NULL; |
| uint64_t pstart = 0, psize = 0; |
| uint32_t part = 0; |
| |
| #if HAVE_BLKID |
| _cleanup_(blkid_free_probep) blkid_probe b = NULL; |
| _cleanup_free_ char *node = NULL; |
| const char *v; |
| int r; |
| |
| r = devname_from_devnum(S_IFBLK, devid, &node); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get device path for " DEVNUM_FORMAT_STR ": %m", DEVNUM_FORMAT_VAL(devid)); |
| |
| errno = 0; |
| b = blkid_new_probe_from_filename(node); |
| if (!b) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(ENOMEM), "Failed to open file system \"%s\": %m", node); |
| |
| blkid_probe_enable_superblocks(b, 1); |
| blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); |
| blkid_probe_enable_partitions(b, 1); |
| blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); |
| |
| errno = 0; |
| r = blkid_do_safeprobe(b); |
| if (r == -2) |
| return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" is ambiguous.", node); |
| else if (r == 1) |
| return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" does not contain a label.", node); |
| else if (r != 0) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe file system \"%s\": %m", node); |
| |
| r = blkid_probe_lookup_value(b, "TYPE", &v, NULL); |
| if (r != 0) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "No filesystem found on \"%s\": %m", node); |
| if (!streq(v, "vfat")) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not FAT.", node); |
| |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL); |
| if (r != 0) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not located on a partitioned block device.", node); |
| if (!streq(v, "gpt")) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not on a GPT partition table.", node); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno ?: EIO, "Failed to probe partition type UUID of \"%s\": %m", node); |
| if (sd_id128_string_equal(v, SD_GPT_ESP) <= 0) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" has wrong type for an EFI System Partition (ESP).", node); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition entry UUID of \"%s\": %m", node); |
| r = sd_id128_from_string(v, &uuid); |
| if (r < 0) |
| return log_error_errno(r, "Partition \"%s\" has invalid UUID \"%s\".", node, v); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition number of \"%s\": %m", node); |
| r = safe_atou32(v, &part); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PART_ENTRY_NUMBER field."); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_OFFSET", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition offset of \"%s\": %m", node); |
| r = safe_atou64(v, &pstart); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PART_ENTRY_OFFSET field."); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_SIZE", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition size of \"%s\": %m", node); |
| r = safe_atou64(v, &psize); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PART_ENTRY_SIZE field."); |
| #endif |
| |
| if (ret_part) |
| *ret_part = part; |
| if (ret_pstart) |
| *ret_pstart = pstart; |
| if (ret_psize) |
| *ret_psize = psize; |
| if (ret_uuid) |
| *ret_uuid = uuid; |
| |
| return 0; |
| } |
| |
| static int verify_esp_udev( |
| dev_t devid, |
| bool searching, |
| uint32_t *ret_part, |
| uint64_t *ret_pstart, |
| uint64_t *ret_psize, |
| sd_id128_t *ret_uuid) { |
| |
| _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
| sd_id128_t uuid = SD_ID128_NULL; |
| uint64_t pstart = 0, psize = 0; |
| uint32_t part = 0; |
| const char *node, *v; |
| int r; |
| |
| r = sd_device_new_from_devnum(&d, 'b', devid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get device from device number: %m"); |
| |
| r = sd_device_get_devname(d, &node); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device node: %m"); |
| |
| r = sd_device_get_property_value(d, "ID_FS_TYPE", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| if (!streq(v, "vfat")) |
| return log_device_full_errno(d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not FAT.", node ); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_SCHEME", &v); |
| if (r < 0) |
| return log_device_full_errno(d, |
| searching && r == -ENOENT ? LOG_DEBUG : LOG_ERR, |
| searching && r == -ENOENT ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : r, |
| "Failed to get device property: %m"); |
| if (!streq(v, "gpt")) |
| return log_device_full_errno(d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not on a GPT partition table.", node); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| if (sd_id128_string_equal(v, SD_GPT_ESP) <= 0) |
| return log_device_full_errno(d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" has wrong type for an EFI System Partition (ESP).", node); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_UUID", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| r = sd_id128_from_string(v, &uuid); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Partition \"%s\" has invalid UUID \"%s\".", node, v); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_NUMBER", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| r = safe_atou32(v, &part); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to parse PART_ENTRY_NUMBER field."); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_OFFSET", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| r = safe_atou64(v, &pstart); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to parse PART_ENTRY_OFFSET field."); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_SIZE", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device property: %m"); |
| r = safe_atou64(v, &psize); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to parse PART_ENTRY_SIZE field."); |
| |
| if (ret_part) |
| *ret_part = part; |
| if (ret_pstart) |
| *ret_pstart = pstart; |
| if (ret_psize) |
| *ret_psize = psize; |
| if (ret_uuid) |
| *ret_uuid = uuid; |
| |
| return 0; |
| } |
| |
| static int verify_fsroot_dir( |
| const char *path, |
| bool searching, |
| bool unprivileged_mode, |
| dev_t *ret_dev) { |
| |
| _cleanup_close_ int fd = -EBADF; |
| STRUCT_NEW_STATX_DEFINE(sxa); |
| STRUCT_NEW_STATX_DEFINE(sxb); |
| int r; |
| |
| /* Checks if the specified directory is at the root of its file system, and returns device |
| * major/minor of the device, if it is. */ |
| |
| assert(path); |
| |
| /* We are using O_PATH here, since that way we can operate on directory inodes we cannot look into, |
| * which is quite likely if we run unprivileged */ |
| fd = open(path, O_CLOEXEC|O_DIRECTORY|O_PATH); |
| if (fd < 0) |
| return log_full_errno((searching && errno == ENOENT) || |
| (unprivileged_mode && ERRNO_IS_PRIVILEGE(errno)) ? LOG_DEBUG : LOG_ERR, errno, |
| "Failed to open directory \"%s\": %m", path); |
| |
| /* So, the ESP and XBOOTLDR partition are commonly located on an autofs mount. stat() on the |
| * directory won't trigger it, if it is not mounted yet. Let's hence explicitly trigger it here, |
| * before stat()ing */ |
| (void) faccessat(fd, "trigger", F_OK, AT_SYMLINK_NOFOLLOW); /* Filename doesn't matter... */ |
| |
| r = statx_fallback(fd, "", AT_EMPTY_PATH, STATX_TYPE|STATX_INO|STATX_MNT_ID, &sxa.sx); |
| if (r < 0) |
| return log_full_errno((unprivileged_mode && ERRNO_IS_PRIVILEGE(r)) ? LOG_DEBUG : LOG_ERR, r, |
| "Failed to determine block device node of \"%s\": %m", path); |
| |
| assert(S_ISDIR(sxa.sx.stx_mode)); /* We used O_DIRECTORY above, when opening, so this must hold */ |
| |
| if (FLAGS_SET(sxa.sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) { |
| |
| /* If we have STATX_ATTR_MOUNT_ROOT, we are happy, that's all we need. We operate under the |
| * assumption that a top of a mount point is also the top of the file system. (Which of |
| * course is strictly speaking not always true...) */ |
| |
| if (!FLAGS_SET(sxa.sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "Directory \"%s\" is not the root of the file system.", path); |
| |
| goto success; |
| } |
| |
| /* Now let's look at the parent */ |
| r = statx_fallback(fd, "..", 0, STATX_TYPE|STATX_INO|STATX_MNT_ID, &sxb.sx); |
| if (r < 0 && ERRNO_IS_PRIVILEGE(r)) { |
| _cleanup_free_ char *parent = NULL; |
| |
| /* If going via ".." didn't work due to EACCESS, then let's determine the parent path |
| * directly instead. It's not as good, due to symlinks and such, but we can't do anything |
| * better here. |
| * |
| * (In case you wonder where this fallback is useful: consider a classic Fedora setup with |
| * /boot/ being an ext4 partition and /boot/efi/ being the VFAT ESP. The latter is mounted |
| * inaccessible for regular users via the dmask= mount option. In that case as unprivileged |
| * user we can stat() /boot/efi/, and we can stat()/enumerate /boot/. But we cannot look into |
| * /boot/efi/, and in particular not use /boot/efi/../ – hence this work-around.) */ |
| |
| if (path_equal(path, "/")) |
| goto success; |
| |
| r = path_extract_directory(path, &parent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to extract parent path from '%s': %m", path); |
| |
| r = statx_fallback(AT_FDCWD, parent, AT_SYMLINK_NOFOLLOW, STATX_TYPE|STATX_INO|STATX_MNT_ID, &sxb.sx); |
| } |
| if (r < 0) |
| return log_full_errno(unprivileged_mode && ERRNO_IS_PRIVILEGE(r) ? LOG_DEBUG : LOG_ERR, r, |
| "Failed to determine block device node of parent of \"%s\": %m", path); |
| |
| if (statx_inode_same(&sxa.sx, &sxb.sx)) /* for the root dir inode nr for both inodes will be the same */ |
| goto success; |
| |
| if (statx_mount_same(&sxa.nsx, &sxb.nsx)) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "Directory \"%s\" is not the root of the file system.", path); |
| |
| success: |
| if (!ret_dev) |
| return 0; |
| |
| if (sxa.sx.stx_dev_major == 0) { /* Hmm, maybe a btrfs device, and the caller asked for the backing device? Then let's try to get it. */ |
| _cleanup_close_ int real_fd = -EBADF; |
| |
| /* The statx() above we can execute on an O_PATH fd. But the btrfs ioctl we cannot. Hence |
| * acquire a "real" fd first, without the O_PATH flag. */ |
| |
| real_fd = fd_reopen(fd, O_DIRECTORY|O_CLOEXEC); |
| if (real_fd < 0) |
| return real_fd; |
| |
| return btrfs_get_block_device_fd(real_fd, ret_dev); |
| } |
| |
| *ret_dev = makedev(sxa.sx.stx_dev_major, sxa.sx.stx_dev_minor); |
| return 0; |
| } |
| |
| static int verify_esp( |
| const char *p, |
| uint32_t *ret_part, |
| uint64_t *ret_pstart, |
| uint64_t *ret_psize, |
| sd_id128_t *ret_uuid, |
| dev_t *ret_devid, |
| VerifyESPFlags flags) { |
| |
| bool relax_checks, searching = FLAGS_SET(flags, VERIFY_ESP_SEARCHING), |
| unprivileged_mode = FLAGS_SET(flags, VERIFY_ESP_UNPRIVILEGED_MODE); |
| dev_t devid = 0; |
| int r; |
| |
| assert(p); |
| |
| /* This logs about all errors, except: |
| * |
| * -ENOENT → if 'searching' is set, and the dir doesn't exist |
| * -EADDRNOTAVAIL → if 'searching' is set, and the dir doesn't look like an ESP |
| * -EACESS → if 'unprivileged_mode' is set, and we have trouble accessing the thing |
| */ |
| |
| relax_checks = |
| getenv_bool("SYSTEMD_RELAX_ESP_CHECKS") > 0 || |
| FLAGS_SET(flags, VERIFY_ESP_RELAX_CHECKS); |
| |
| /* Non-root user can only check the status, so if an error occurred in the following, it does not cause any |
| * issues. Let's also, silence the error messages. */ |
| |
| if (!relax_checks) { |
| struct statfs sfs; |
| |
| if (statfs(p, &sfs) < 0) |
| /* If we are searching for the mount point, don't generate a log message if we can't find the path */ |
| return log_full_errno((searching && errno == ENOENT) || |
| (unprivileged_mode && errno == EACCES) ? LOG_DEBUG : LOG_ERR, errno, |
| "Failed to check file system type of \"%s\": %m", p); |
| |
| if (!F_TYPE_EQUAL(sfs.f_type, MSDOS_SUPER_MAGIC)) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV), |
| "File system \"%s\" is not a FAT EFI System Partition (ESP) file system.", p); |
| } |
| |
| relax_checks = |
| relax_checks || |
| detect_container() > 0; |
| |
| r = verify_fsroot_dir(p, searching, unprivileged_mode, relax_checks ? NULL : &devid); |
| if (r < 0) |
| return r; |
| |
| /* In a container we don't have access to block devices, skip this part of the verification, we trust |
| * the container manager set everything up correctly on its own. */ |
| if (relax_checks) |
| goto finish; |
| |
| /* If we are unprivileged we ask udev for the metadata about the partition. If we are privileged we |
| * use blkid instead. Why? Because this code is called from 'bootctl' which is pretty much an |
| * emergency recovery tool that should also work when udev isn't up (i.e. from the emergency shell), |
| * however blkid can't work if we have no privileges to access block devices directly, which is why |
| * we use udev in that case. */ |
| if (unprivileged_mode) |
| r = verify_esp_udev(devid, searching, ret_part, ret_pstart, ret_psize, ret_uuid); |
| else |
| r = verify_esp_blkid(devid, searching, ret_part, ret_pstart, ret_psize, ret_uuid); |
| if (r < 0) |
| return r; |
| |
| if (ret_devid) |
| *ret_devid = devid; |
| |
| return 0; |
| |
| finish: |
| if (ret_part) |
| *ret_part = 0; |
| if (ret_pstart) |
| *ret_pstart = 0; |
| if (ret_psize) |
| *ret_psize = 0; |
| if (ret_uuid) |
| *ret_uuid = SD_ID128_NULL; |
| if (ret_devid) |
| *ret_devid = 0; |
| |
| return 0; |
| } |
| |
| int find_esp_and_warn( |
| const char *root, |
| const char *path, |
| bool unprivileged_mode, |
| char **ret_path, |
| uint32_t *ret_part, |
| uint64_t *ret_pstart, |
| uint64_t *ret_psize, |
| sd_id128_t *ret_uuid, |
| dev_t *ret_devid) { |
| |
| VerifyESPFlags flags = (unprivileged_mode ? VERIFY_ESP_UNPRIVILEGED_MODE : 0) | |
| (root ? VERIFY_ESP_RELAX_CHECKS : 0); |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| /* This logs about all errors except: |
| * |
| * -ENOKEY → when we can't find the partition |
| * -EACCESS → when unprivileged_mode is true, and we can't access something |
| */ |
| |
| if (path) { |
| r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path %s%s%s: %m", |
| path, |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| r = verify_esp(p, ret_part, ret_pstart, ret_psize, ret_uuid, ret_devid, flags); |
| if (r < 0) |
| return r; |
| |
| goto found; |
| } |
| |
| path = getenv("SYSTEMD_ESP_PATH"); |
| if (path) { |
| struct stat st; |
| |
| r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path %s%s%s: %m", |
| path, |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| if (!path_is_valid(p) || !path_is_absolute(p)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "$SYSTEMD_ESP_PATH does not refer to absolute path, refusing to use it: %s", |
| p); |
| |
| /* Note: when the user explicitly configured things with an env var we won't validate the |
| * path beyond checking it refers to a directory. After all we want this to be useful for |
| * testing. */ |
| |
| if (stat(p, &st) < 0) |
| return log_error_errno(errno, "Failed to stat '%s': %m", p); |
| if (!S_ISDIR(st.st_mode)) |
| return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR), "ESP path '%s' is not a directory.", p); |
| |
| if (ret_part) |
| *ret_part = 0; |
| if (ret_pstart) |
| *ret_pstart = 0; |
| if (ret_psize) |
| *ret_psize = 0; |
| if (ret_uuid) |
| *ret_uuid = SD_ID128_NULL; |
| if (ret_devid) |
| *ret_devid = st.st_dev; |
| |
| goto found; |
| } |
| |
| FOREACH_STRING(dir, "/efi", "/boot", "/boot/efi") { |
| r = chase_symlinks(dir, root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r == -ENOENT) |
| continue; |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path %s%s%s: %m", |
| dir, |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| r = verify_esp(p, ret_part, ret_pstart, ret_psize, ret_uuid, ret_devid, |
| flags | VERIFY_ESP_SEARCHING); |
| if (r >= 0) |
| goto found; |
| if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL, -ENOTDIR, -ENOTTY)) /* This one is not it */ |
| return r; |
| |
| p = mfree(p); |
| } |
| |
| /* No logging here */ |
| return -ENOKEY; |
| |
| found: |
| if (ret_path) |
| *ret_path = TAKE_PTR(p); |
| |
| return 0; |
| } |
| |
| static int verify_xbootldr_blkid( |
| dev_t devid, |
| bool searching, |
| sd_id128_t *ret_uuid) { |
| |
| sd_id128_t uuid = SD_ID128_NULL; |
| |
| #if HAVE_BLKID |
| _cleanup_(blkid_free_probep) blkid_probe b = NULL; |
| _cleanup_free_ char *node = NULL; |
| const char *type, *v; |
| int r; |
| |
| r = devname_from_devnum(S_IFBLK, devid, &node); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get block device path for " DEVNUM_FORMAT_STR ": %m", |
| DEVNUM_FORMAT_VAL(devid)); |
| |
| errno = 0; |
| b = blkid_new_probe_from_filename(node); |
| if (!b) |
| return log_error_errno(errno_or_else(ENOMEM), "%s: Failed to create blkid probe: %m", node); |
| |
| blkid_probe_enable_partitions(b, 1); |
| blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); |
| |
| errno = 0; |
| r = blkid_do_safeprobe(b); |
| if (r == _BLKID_SAFEPROBE_AMBIGUOUS) |
| return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "%s: File system is ambiguous.", node); |
| if (r == _BLKID_SAFEPROBE_NOT_FOUND) |
| return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "%s: File system does not contain a label.", node); |
| if (r == _BLKID_SAFEPROBE_ERROR) |
| return log_error_errno(errno_or_else(EIO), "%s: Failed to probe file system: %m", node); |
| |
| assert(r == _BLKID_SAFEPROBE_FOUND); |
| |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &type, NULL); |
| if (r != 0) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(EIO), |
| "%s: Failed to probe PART_ENTRY_SCHEME: %m", node); |
| if (streq(type, "gpt")) { |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno_or_else(EIO), "%s: Failed to probe PART_ENTRY_TYPE: %m", node); |
| if (sd_id128_string_equal(v, SD_GPT_XBOOTLDR) <= 0) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "%s: Partitition has wrong PART_ENTRY_TYPE=%s for XBOOTLDR partition.", node, v); |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno_or_else(EIO), "%s: Failed to probe PART_ENTRY_UUID: %m", node); |
| r = sd_id128_from_string(v, &uuid); |
| if (r < 0) |
| return log_error_errno(r, "%s: Partition has invalid UUID PART_ENTRY_TYPE=%s: %m", node, v); |
| |
| } else if (streq(type, "dos")) { |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); |
| if (r != 0) |
| return log_error_errno(errno_or_else(EIO), "%s: Failed to probe PART_ENTRY_TYPE: %m", node); |
| if (!streq(v, "0xea")) |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "%s: Wrong PART_ENTRY_TYPE=%s for XBOOTLDR partition.", node, v); |
| |
| } else |
| return log_full_errno(searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "%s: Not on a GPT or DOS partition table (PART_ENTRY_SCHEME=%s).", node, type); |
| #endif |
| |
| if (ret_uuid) |
| *ret_uuid = uuid; |
| |
| return 0; |
| } |
| |
| static int verify_xbootldr_udev( |
| dev_t devid, |
| bool searching, |
| sd_id128_t *ret_uuid) { |
| |
| _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
| sd_id128_t uuid = SD_ID128_NULL; |
| const char *node, *type, *v; |
| int r; |
| |
| r = sd_device_new_from_devnum(&d, 'b', devid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get block device for " DEVNUM_FORMAT_STR ": %m", DEVNUM_FORMAT_VAL(devid)); |
| |
| r = sd_device_get_devname(d, &node); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to get device node: %m"); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_SCHEME", &type); |
| if (r < 0) |
| return log_device_full_errno(d, |
| searching && r == -ENOENT ? LOG_DEBUG : LOG_ERR, |
| searching && r == -ENOENT ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : r, |
| "Failed to query ID_PART_ENTRY_SCHEME: %m"); |
| |
| if (streq(type, "gpt")) { |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to query ID_PART_ENTRY_TYPE: %m"); |
| |
| r = sd_id128_string_equal(v, SD_GPT_XBOOTLDR); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to parse ID_PART_ENTRY_TYPE=%s: %m", v); |
| if (r == 0) |
| return log_device_full_errno( |
| d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "Partition has wrong ID_PART_ENTRY_TYPE=%s for XBOOTLDR partition.", v); |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_UUID", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to query ID_PART_ENTRY_UUID: %m"); |
| r = sd_id128_from_string(v, &uuid); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Partition has invalid UUID ID_PART_ENTRY_TYPE=%s: %m", v); |
| |
| } else if (streq(type, "dos")) { |
| |
| r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v); |
| if (r < 0) |
| return log_device_error_errno(d, r, "Failed to query ID_PART_ENTRY_TYPE: %m"); |
| if (!streq(v, "0xea")) |
| return log_device_full_errno( |
| d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "Wrong ID_PART_ENTRY_TYPE=%s for XBOOTLDR partition.", v); |
| |
| } else |
| return log_device_full_errno( |
| d, |
| searching ? LOG_DEBUG : LOG_ERR, |
| searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV), |
| "Not on a GPT or DOS partition table (ID_PART_ENTRY_SCHEME=%s).", type); |
| |
| if (ret_uuid) |
| *ret_uuid = uuid; |
| |
| return 0; |
| } |
| |
| static int verify_xbootldr( |
| const char *p, |
| bool searching, |
| bool unprivileged_mode, |
| sd_id128_t *ret_uuid, |
| dev_t *ret_devid) { |
| |
| bool relax_checks; |
| dev_t devid = 0; |
| int r; |
| |
| assert(p); |
| |
| relax_checks = |
| getenv_bool("SYSTEMD_RELAX_XBOOTLDR_CHECKS") > 0 || |
| detect_container() > 0; |
| |
| r = verify_fsroot_dir(p, searching, unprivileged_mode, relax_checks ? NULL : &devid); |
| if (r < 0) |
| return r; |
| |
| if (relax_checks) |
| goto finish; |
| |
| if (unprivileged_mode) |
| r = verify_xbootldr_udev(devid, searching, ret_uuid); |
| else |
| r = verify_xbootldr_blkid(devid, searching, ret_uuid); |
| if (r < 0) |
| return r; |
| |
| if (ret_devid) |
| *ret_devid = devid; |
| |
| return 0; |
| |
| finish: |
| if (ret_uuid) |
| *ret_uuid = SD_ID128_NULL; |
| if (ret_devid) |
| *ret_devid = 0; |
| |
| return 0; |
| } |
| |
| int find_xbootldr_and_warn( |
| const char *root, |
| const char *path, |
| bool unprivileged_mode, |
| char **ret_path, |
| sd_id128_t *ret_uuid, |
| dev_t *ret_devid) { |
| |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| /* Similar to find_esp_and_warn(), but finds the XBOOTLDR partition. Returns the same errors. */ |
| |
| if (path) { |
| r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path %s%s%s: %m", |
| path, |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| r = verify_xbootldr(p, /* searching= */ false, unprivileged_mode, ret_uuid, ret_devid); |
| if (r < 0) |
| return r; |
| |
| goto found; |
| } |
| |
| path = getenv("SYSTEMD_XBOOTLDR_PATH"); |
| if (path) { |
| struct stat st; |
| |
| r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path %s%s%s: %m", |
| path, |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| if (!path_is_valid(p) || !path_is_absolute(p)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "$SYSTEMD_XBOOTLDR_PATH does not refer to absolute path, refusing to use it: %s", |
| p); |
| |
| if (stat(p, &st) < 0) |
| return log_error_errno(errno, "Failed to stat '%s': %m", p); |
| if (!S_ISDIR(st.st_mode)) |
| return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR), "XBOOTLDR path '%s' is not a directory.", p); |
| |
| if (ret_uuid) |
| *ret_uuid = SD_ID128_NULL; |
| if (ret_devid) |
| *ret_devid = st.st_dev; |
| |
| goto found; |
| } |
| |
| r = chase_symlinks("/boot", root, CHASE_PREFIX_ROOT, &p, NULL); |
| if (r == -ENOENT) |
| return -ENOKEY; |
| if (r < 0) |
| return log_error_errno(r, |
| "Failed to resolve path /boot%s%s: %m", |
| root ? " under directory " : "", |
| strempty(root)); |
| |
| r = verify_xbootldr(p, /* searching= */ true, unprivileged_mode, ret_uuid, ret_devid); |
| if (r >= 0) |
| goto found; |
| if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL, -ENOTDIR)) /* This one is not it */ |
| return r; |
| |
| return -ENOKEY; |
| |
| found: |
| if (ret_path) |
| *ret_path = TAKE_PTR(p); |
| |
| return 0; |
| } |
