1093 lines
36 KiB
C
1093 lines
36 KiB
C
/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_LIBCRYPTSETUP
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#include <libcryptsetup.h>
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#endif
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#include <linux/dm-ioctl.h>
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#include <sys/mount.h>
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#include "architecture.h"
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#include "ask-password-api.h"
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#include "blkid-util.h"
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#include "dissect-image.h"
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#include "fd-util.h"
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#include "gpt.h"
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#include "mount-util.h"
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#include "path-util.h"
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#include "stat-util.h"
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#include "stdio-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "udev-util.h"
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static int probe_filesystem(const char *node, char **ret_fstype) {
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#ifdef HAVE_BLKID
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_cleanup_blkid_free_probe_ blkid_probe b = NULL;
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const char *fstype;
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int r;
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b = blkid_new_probe_from_filename(node);
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if (!b)
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return -ENOMEM;
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blkid_probe_enable_superblocks(b, 1);
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blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
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errno = 0;
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r = blkid_do_safeprobe(b);
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if (r == -2 || r == 1) {
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log_debug("Failed to identify any partition type on partition %s", node);
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goto not_found;
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}
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if (r != 0) {
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if (errno == 0)
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return -EIO;
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return -errno;
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}
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(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
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if (fstype) {
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char *t;
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t = strdup(fstype);
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if (!t)
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return -ENOMEM;
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*ret_fstype = t;
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return 1;
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}
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not_found:
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*ret_fstype = NULL;
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return 0;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectImageFlags flags, DissectedImage **ret) {
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#ifdef HAVE_BLKID
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sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL;
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_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
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bool is_gpt, is_mbr, generic_rw, multiple_generic = false;
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_cleanup_udev_device_unref_ struct udev_device *d = NULL;
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_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
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_cleanup_blkid_free_probe_ blkid_probe b = NULL;
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_cleanup_udev_unref_ struct udev *udev = NULL;
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_cleanup_free_ char *generic_node = NULL;
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sd_id128_t generic_uuid = SD_ID128_NULL;
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const char *pttype = NULL;
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struct udev_list_entry *first, *item;
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blkid_partlist pl;
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int r, generic_nr;
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struct stat st;
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unsigned i;
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assert(fd >= 0);
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assert(ret);
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assert(root_hash || root_hash_size == 0);
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/* Probes a disk image, and returns information about what it found in *ret.
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*
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* Returns -ENOPKG if no suitable partition table or file system could be found.
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* Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */
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if (root_hash) {
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/* If a root hash is supplied, then we use the root partition that has a UUID that match the first
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* 128bit of the root hash. And we use the verity partition that has a UUID that match the final
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* 128bit. */
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if (root_hash_size < sizeof(sd_id128_t))
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return -EINVAL;
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memcpy(&root_uuid, root_hash, sizeof(sd_id128_t));
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memcpy(&verity_uuid, (const uint8_t*) root_hash + root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t));
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if (sd_id128_is_null(root_uuid))
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return -EINVAL;
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if (sd_id128_is_null(verity_uuid))
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return -EINVAL;
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}
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if (fstat(fd, &st) < 0)
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return -errno;
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if (!S_ISBLK(st.st_mode))
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return -ENOTBLK;
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b = blkid_new_probe();
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if (!b)
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return -ENOMEM;
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errno = 0;
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r = blkid_probe_set_device(b, fd, 0, 0);
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if (r != 0) {
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if (errno == 0)
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return -ENOMEM;
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return -errno;
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}
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if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) {
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/* Look for file system superblocks, unless we only shall look for GPT partition tables */
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blkid_probe_enable_superblocks(b, 1);
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blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE);
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}
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blkid_probe_enable_partitions(b, 1);
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blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
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errno = 0;
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r = blkid_do_safeprobe(b);
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if (r == -2 || r == 1) {
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log_debug("Failed to identify any partition table.");
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return -ENOPKG;
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}
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if (r != 0) {
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if (errno == 0)
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return -EIO;
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return -errno;
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}
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m = new0(DissectedImage, 1);
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if (!m)
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return -ENOMEM;
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if (!(flags & DISSECT_IMAGE_GPT_ONLY) &&
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(flags & DISSECT_IMAGE_REQUIRE_ROOT)) {
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const char *usage = NULL;
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(void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL);
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if (STRPTR_IN_SET(usage, "filesystem", "crypto")) {
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_cleanup_free_ char *t = NULL, *n = NULL;
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const char *fstype = NULL;
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/* OK, we have found a file system, that's our root partition then. */
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(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
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if (fstype) {
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t = strdup(fstype);
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if (!t)
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return -ENOMEM;
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}
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if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0)
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return -ENOMEM;
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m->partitions[PARTITION_ROOT] = (DissectedPartition) {
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.found = true,
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.rw = true,
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.partno = -1,
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.architecture = _ARCHITECTURE_INVALID,
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.fstype = t,
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.node = n,
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};
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t = n = NULL;
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m->encrypted = streq(fstype, "crypto_LUKS");
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*ret = m;
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m = NULL;
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return 0;
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}
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}
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(void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
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if (!pttype)
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return -ENOPKG;
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is_gpt = streq_ptr(pttype, "gpt");
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is_mbr = streq_ptr(pttype, "dos");
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if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr))
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return -ENOPKG;
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errno = 0;
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pl = blkid_probe_get_partitions(b);
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if (!pl) {
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if (errno == 0)
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return -ENOMEM;
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return -errno;
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}
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udev = udev_new();
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if (!udev)
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return -errno;
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d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
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if (!d)
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return -ENOMEM;
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for (i = 0;; i++) {
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int n, z;
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if (i >= 10) {
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log_debug("Kernel partitions never appeared.");
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return -ENXIO;
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}
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e = udev_enumerate_new(udev);
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if (!e)
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return -errno;
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r = udev_enumerate_add_match_parent(e, d);
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if (r < 0)
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return r;
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r = udev_enumerate_scan_devices(e);
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if (r < 0)
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return r;
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/* Count the partitions enumerated by the kernel */
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n = 0;
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first)
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n++;
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/* Count the partitions enumerated by blkid */
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z = blkid_partlist_numof_partitions(pl);
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if (n == z + 1)
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break;
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if (n > z + 1) {
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log_debug("blkid and kernel partition list do not match.");
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return -EIO;
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}
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if (n < z + 1) {
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unsigned j;
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/* The kernel has probed fewer partitions than blkid? Maybe the kernel prober is still running
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* or it got EBUSY because udev already opened the device. Let's reprobe the device, which is a
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* synchronous call that waits until probing is complete. */
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for (j = 0; j < 20; j++) {
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r = ioctl(fd, BLKRRPART, 0);
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if (r < 0)
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r = -errno;
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if (r >= 0 || r != -EBUSY)
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break;
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/* If something else has the device open, such as an udev rule, the ioctl will return
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* EBUSY. Since there's no way to wait until it isn't busy anymore, let's just wait a
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* bit, and try again.
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*
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* This is really something they should fix in the kernel! */
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usleep(50 * USEC_PER_MSEC);
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}
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if (r < 0)
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return r;
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}
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e = udev_enumerate_unref(e);
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first) {
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_cleanup_udev_device_unref_ struct udev_device *q;
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unsigned long long pflags;
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blkid_partition pp;
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const char *node;
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dev_t qn;
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int nr;
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q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
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if (!q)
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return -errno;
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qn = udev_device_get_devnum(q);
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if (major(qn) == 0)
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continue;
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if (st.st_rdev == qn)
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continue;
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node = udev_device_get_devnode(q);
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if (!node)
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continue;
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pp = blkid_partlist_devno_to_partition(pl, qn);
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if (!pp)
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continue;
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pflags = blkid_partition_get_flags(pp);
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nr = blkid_partition_get_partno(pp);
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if (nr < 0)
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continue;
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if (is_gpt) {
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int designator = _PARTITION_DESIGNATOR_INVALID, architecture = _ARCHITECTURE_INVALID;
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const char *stype, *sid, *fstype = NULL;
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sd_id128_t type_id, id;
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bool rw = true;
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if (pflags & GPT_FLAG_NO_AUTO)
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continue;
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sid = blkid_partition_get_uuid(pp);
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if (!sid)
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continue;
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if (sd_id128_from_string(sid, &id) < 0)
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continue;
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stype = blkid_partition_get_type_string(pp);
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if (!stype)
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continue;
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if (sd_id128_from_string(stype, &type_id) < 0)
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continue;
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if (sd_id128_equal(type_id, GPT_HOME)) {
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designator = PARTITION_HOME;
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rw = !(pflags & GPT_FLAG_READ_ONLY);
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} else if (sd_id128_equal(type_id, GPT_SRV)) {
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designator = PARTITION_SRV;
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rw = !(pflags & GPT_FLAG_READ_ONLY);
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} else if (sd_id128_equal(type_id, GPT_ESP)) {
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designator = PARTITION_ESP;
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fstype = "vfat";
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}
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#ifdef GPT_ROOT_NATIVE
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else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
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/* If a root ID is specified, ignore everything but the root id */
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if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
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continue;
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designator = PARTITION_ROOT;
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architecture = native_architecture();
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rw = !(pflags & GPT_FLAG_READ_ONLY);
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} else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
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m->can_verity = true;
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/* Ignore verity unless a root hash is specified */
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if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
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continue;
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designator = PARTITION_ROOT_VERITY;
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fstype = "DM_verity_hash";
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architecture = native_architecture();
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rw = false;
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}
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#endif
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#ifdef GPT_ROOT_SECONDARY
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else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
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/* If a root ID is specified, ignore everything but the root id */
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if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id))
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continue;
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designator = PARTITION_ROOT_SECONDARY;
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architecture = SECONDARY_ARCHITECTURE;
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rw = !(pflags & GPT_FLAG_READ_ONLY);
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} else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
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m->can_verity = true;
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/* Ignore verity unless root has is specified */
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if (sd_id128_is_null(verity_uuid) || !sd_id128_equal(verity_uuid, id))
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continue;
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designator = PARTITION_ROOT_SECONDARY_VERITY;
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fstype = "DM_verity_hash";
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architecture = SECONDARY_ARCHITECTURE;
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rw = false;
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}
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#endif
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else if (sd_id128_equal(type_id, GPT_SWAP)) {
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designator = PARTITION_SWAP;
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fstype = "swap";
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} else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
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if (generic_node)
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multiple_generic = true;
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else {
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generic_nr = nr;
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generic_rw = !(pflags & GPT_FLAG_READ_ONLY);
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generic_uuid = id;
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generic_node = strdup(node);
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if (!generic_node)
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return -ENOMEM;
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}
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}
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if (designator != _PARTITION_DESIGNATOR_INVALID) {
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_cleanup_free_ char *t = NULL, *n = NULL;
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/* First one wins */
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if (m->partitions[designator].found)
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continue;
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if (fstype) {
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t = strdup(fstype);
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if (!t)
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return -ENOMEM;
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}
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n = strdup(node);
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if (!n)
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return -ENOMEM;
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m->partitions[designator] = (DissectedPartition) {
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.found = true,
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.partno = nr,
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.rw = rw,
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.architecture = architecture,
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.node = n,
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.fstype = t,
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.uuid = id,
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};
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n = t = NULL;
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}
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} else if (is_mbr) {
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if (pflags != 0x80) /* Bootable flag */
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continue;
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if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */
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continue;
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|
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if (generic_node)
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multiple_generic = true;
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else {
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generic_nr = nr;
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generic_rw = true;
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generic_node = strdup(node);
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if (!generic_node)
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return -ENOMEM;
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}
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}
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}
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|
|
if (!m->partitions[PARTITION_ROOT].found) {
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|
/* No root partition found? Then let's see if ther's one for the secondary architecture. And if not
|
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* either, then check if there's a single generic one, and use that. */
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if (m->partitions[PARTITION_ROOT_VERITY].found)
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return -EADDRNOTAVAIL;
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if (m->partitions[PARTITION_ROOT_SECONDARY].found) {
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m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY];
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zero(m->partitions[PARTITION_ROOT_SECONDARY]);
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m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY];
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zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]);
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} else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) {
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|
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/* If the root has was set, then we won't fallback to a generic node, because the root hash
|
|
* decides */
|
|
if (root_hash)
|
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return -EADDRNOTAVAIL;
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|
|
/* If we didn't find a generic node, then we can't fix this up either */
|
|
if (!generic_node)
|
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return -ENXIO;
|
|
|
|
/* If we didn't find a properly marked root partition, but we did find a single suitable
|
|
* generic Linux partition, then use this as root partition, if the caller asked for it. */
|
|
if (multiple_generic)
|
|
return -ENOTUNIQ;
|
|
|
|
m->partitions[PARTITION_ROOT] = (DissectedPartition) {
|
|
.found = true,
|
|
.rw = generic_rw,
|
|
.partno = generic_nr,
|
|
.architecture = _ARCHITECTURE_INVALID,
|
|
.node = generic_node,
|
|
.uuid = generic_uuid,
|
|
};
|
|
|
|
generic_node = NULL;
|
|
}
|
|
}
|
|
|
|
if (root_hash) {
|
|
if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
/* If we found the primary root with the hash, then we definitely want to suppress any secondary root
|
|
* (which would be weird, after all the root hash should only be assigned to one pair of
|
|
* partitions... */
|
|
m->partitions[PARTITION_ROOT_SECONDARY].found = false;
|
|
m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false;
|
|
|
|
/* If we found a verity setup, then the root partition is necessarily read-only. */
|
|
m->partitions[PARTITION_ROOT].rw = false;
|
|
|
|
m->verity = true;
|
|
}
|
|
|
|
blkid_free_probe(b);
|
|
b = NULL;
|
|
|
|
/* Fill in file system types if we don't know them yet. */
|
|
for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
|
|
DissectedPartition *p = m->partitions + i;
|
|
|
|
if (!p->found)
|
|
continue;
|
|
|
|
if (!p->fstype && p->node) {
|
|
r = probe_filesystem(p->node, &p->fstype);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (streq_ptr(p->fstype, "crypto_LUKS"))
|
|
m->encrypted = true;
|
|
}
|
|
|
|
*ret = m;
|
|
m = NULL;
|
|
|
|
return 0;
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
DissectedImage* dissected_image_unref(DissectedImage *m) {
|
|
unsigned i;
|
|
|
|
if (!m)
|
|
return NULL;
|
|
|
|
for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
|
|
free(m->partitions[i].fstype);
|
|
free(m->partitions[i].node);
|
|
free(m->partitions[i].decrypted_fstype);
|
|
free(m->partitions[i].decrypted_node);
|
|
}
|
|
|
|
free(m);
|
|
return NULL;
|
|
}
|
|
|
|
static int is_loop_device(const char *path) {
|
|
char s[strlen("/sys/dev/block/") + DECIMAL_STR_MAX(dev_t) + 1 + DECIMAL_STR_MAX(dev_t) + strlen("/../loop/")];
|
|
struct stat st;
|
|
|
|
assert(path);
|
|
|
|
if (stat(path, &st) < 0)
|
|
return -errno;
|
|
|
|
if (!S_ISBLK(st.st_mode))
|
|
return -ENOTBLK;
|
|
|
|
xsprintf(s, "/sys/dev/block/%u:%u/loop/", major(st.st_rdev), minor(st.st_rdev));
|
|
if (access(s, F_OK) < 0) {
|
|
if (errno != ENOENT)
|
|
return -errno;
|
|
|
|
/* The device itself isn't a loop device, but maybe it's a partition and its parent is? */
|
|
xsprintf(s, "/sys/dev/block/%u:%u/../loop/", major(st.st_rdev), minor(st.st_rdev));
|
|
if (access(s, F_OK) < 0)
|
|
return errno == ENOENT ? false : -errno;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int mount_partition(
|
|
DissectedPartition *m,
|
|
const char *where,
|
|
const char *directory,
|
|
DissectImageFlags flags) {
|
|
|
|
const char *p, *options = NULL, *node, *fstype;
|
|
bool rw;
|
|
|
|
assert(m);
|
|
assert(where);
|
|
|
|
node = m->decrypted_node ?: m->node;
|
|
fstype = m->decrypted_fstype ?: m->fstype;
|
|
|
|
if (!m->found || !node || !fstype)
|
|
return 0;
|
|
|
|
/* Stacked encryption? Yuck */
|
|
if (streq_ptr(fstype, "crypto_LUKS"))
|
|
return -ELOOP;
|
|
|
|
rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY);
|
|
|
|
if (directory)
|
|
p = strjoina(where, directory);
|
|
else
|
|
p = where;
|
|
|
|
/* If requested, turn on discard support. */
|
|
if (STR_IN_SET(fstype, "btrfs", "ext4", "vfat", "xfs") &&
|
|
((flags & DISSECT_IMAGE_DISCARD) ||
|
|
((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node))))
|
|
options = "discard";
|
|
|
|
return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
|
|
}
|
|
|
|
int dissected_image_mount(DissectedImage *m, const char *where, DissectImageFlags flags) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(where);
|
|
|
|
if (!m->partitions[PARTITION_ROOT].found)
|
|
return -ENXIO;
|
|
|
|
r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, flags);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", flags);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", flags);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (m->partitions[PARTITION_ESP].found) {
|
|
const char *mp, *x;
|
|
|
|
/* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
|
|
|
|
mp = "/efi";
|
|
x = strjoina(where, mp);
|
|
r = dir_is_empty(x);
|
|
if (r == -ENOENT) {
|
|
mp = "/boot";
|
|
x = strjoina(where, mp);
|
|
r = dir_is_empty(x);
|
|
}
|
|
if (r > 0) {
|
|
r = mount_partition(m->partitions + PARTITION_ESP, where, mp, flags);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
typedef struct DecryptedPartition {
|
|
struct crypt_device *device;
|
|
char *name;
|
|
bool relinquished;
|
|
} DecryptedPartition;
|
|
|
|
struct DecryptedImage {
|
|
DecryptedPartition *decrypted;
|
|
size_t n_decrypted;
|
|
size_t n_allocated;
|
|
};
|
|
#endif
|
|
|
|
DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
size_t i;
|
|
int r;
|
|
|
|
if (!d)
|
|
return NULL;
|
|
|
|
for (i = 0; i < d->n_decrypted; i++) {
|
|
DecryptedPartition *p = d->decrypted + i;
|
|
|
|
if (p->device && p->name && !p->relinquished) {
|
|
r = crypt_deactivate(p->device, p->name);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
|
|
}
|
|
|
|
if (p->device)
|
|
crypt_free(p->device);
|
|
free(p->name);
|
|
}
|
|
|
|
free(d);
|
|
#endif
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
|
|
static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) {
|
|
_cleanup_free_ char *name = NULL, *node = NULL;
|
|
const char *base;
|
|
|
|
assert(original_node);
|
|
assert(suffix);
|
|
assert(ret_name);
|
|
assert(ret_node);
|
|
|
|
base = strrchr(original_node, '/');
|
|
if (!base)
|
|
return -EINVAL;
|
|
base++;
|
|
if (isempty(base))
|
|
return -EINVAL;
|
|
|
|
name = strjoin(base, suffix);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
if (!filename_is_valid(name))
|
|
return -EINVAL;
|
|
|
|
node = strjoin(crypt_get_dir(), "/", name);
|
|
if (!node)
|
|
return -ENOMEM;
|
|
|
|
*ret_name = name;
|
|
*ret_node = node;
|
|
|
|
name = node = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int decrypt_partition(
|
|
DissectedPartition *m,
|
|
const char *passphrase,
|
|
DissectImageFlags flags,
|
|
DecryptedImage *d) {
|
|
|
|
_cleanup_free_ char *node = NULL, *name = NULL;
|
|
struct crypt_device *cd;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(d);
|
|
|
|
if (!m->found || !m->node || !m->fstype)
|
|
return 0;
|
|
|
|
if (!streq(m->fstype, "crypto_LUKS"))
|
|
return 0;
|
|
|
|
r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
|
|
return -ENOMEM;
|
|
|
|
r = crypt_init(&cd, m->node);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = crypt_load(cd, CRYPT_LUKS1, NULL);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
|
|
((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
|
|
((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
|
|
if (r == -EPERM) {
|
|
r = -EKEYREJECTED;
|
|
goto fail;
|
|
}
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
d->decrypted[d->n_decrypted].name = name;
|
|
name = NULL;
|
|
|
|
d->decrypted[d->n_decrypted].device = cd;
|
|
d->n_decrypted++;
|
|
|
|
m->decrypted_node = node;
|
|
node = NULL;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
crypt_free(cd);
|
|
return r;
|
|
}
|
|
|
|
static int verity_partition(
|
|
DissectedPartition *m,
|
|
DissectedPartition *v,
|
|
const void *root_hash,
|
|
size_t root_hash_size,
|
|
DissectImageFlags flags,
|
|
DecryptedImage *d) {
|
|
|
|
_cleanup_free_ char *node = NULL, *name = NULL;
|
|
struct crypt_device *cd;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(v);
|
|
|
|
if (!root_hash)
|
|
return 0;
|
|
|
|
if (!m->found || !m->node || !m->fstype)
|
|
return 0;
|
|
if (!v->found || !v->node || !v->fstype)
|
|
return 0;
|
|
|
|
if (!streq(v->fstype, "DM_verity_hash"))
|
|
return 0;
|
|
|
|
r = make_dm_name_and_node(m->node, "-verity", &name, &node);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
|
|
return -ENOMEM;
|
|
|
|
r = crypt_init(&cd, v->node);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = crypt_load(cd, CRYPT_VERITY, NULL);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = crypt_set_data_device(cd, m->node);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
d->decrypted[d->n_decrypted].name = name;
|
|
name = NULL;
|
|
|
|
d->decrypted[d->n_decrypted].device = cd;
|
|
d->n_decrypted++;
|
|
|
|
m->decrypted_node = node;
|
|
node = NULL;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
crypt_free(cd);
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
int dissected_image_decrypt(
|
|
DissectedImage *m,
|
|
const char *passphrase,
|
|
const void *root_hash,
|
|
size_t root_hash_size,
|
|
DissectImageFlags flags,
|
|
DecryptedImage **ret) {
|
|
|
|
_cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL;
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
unsigned i;
|
|
int r;
|
|
#endif
|
|
|
|
assert(m);
|
|
assert(root_hash || root_hash_size == 0);
|
|
|
|
/* Returns:
|
|
*
|
|
* = 0 → There was nothing to decrypt
|
|
* > 0 → Decrypted successfully
|
|
* -ENOKEY → There's some to decrypt but no key was supplied
|
|
* -EKEYREJECTED → Passed key was not correct
|
|
*/
|
|
|
|
if (root_hash && root_hash_size < sizeof(sd_id128_t))
|
|
return -EINVAL;
|
|
|
|
if (!m->encrypted && !m->verity) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
if (m->encrypted && !passphrase)
|
|
return -ENOKEY;
|
|
|
|
d = new0(DecryptedImage, 1);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
|
|
DissectedPartition *p = m->partitions + i;
|
|
int k;
|
|
|
|
if (!p->found)
|
|
continue;
|
|
|
|
r = decrypt_partition(p, passphrase, flags, d);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
k = PARTITION_VERITY_OF(i);
|
|
if (k >= 0) {
|
|
r = verity_partition(p, m->partitions + k, root_hash, root_hash_size, flags, d);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (!p->decrypted_fstype && p->decrypted_node) {
|
|
r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
*ret = d;
|
|
d = NULL;
|
|
|
|
return 1;
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
int dissected_image_decrypt_interactively(
|
|
DissectedImage *m,
|
|
const char *passphrase,
|
|
const void *root_hash,
|
|
size_t root_hash_size,
|
|
DissectImageFlags flags,
|
|
DecryptedImage **ret) {
|
|
|
|
_cleanup_strv_free_erase_ char **z = NULL;
|
|
int n = 3, r;
|
|
|
|
if (passphrase)
|
|
n--;
|
|
|
|
for (;;) {
|
|
r = dissected_image_decrypt(m, passphrase, root_hash, root_hash_size, flags, ret);
|
|
if (r >= 0)
|
|
return r;
|
|
if (r == -EKEYREJECTED)
|
|
log_error_errno(r, "Incorrect passphrase, try again!");
|
|
else if (r != -ENOKEY) {
|
|
log_error_errno(r, "Failed to decrypt image: %m");
|
|
return r;
|
|
}
|
|
|
|
if (--n < 0) {
|
|
log_error("Too many retries.");
|
|
return -EKEYREJECTED;
|
|
}
|
|
|
|
z = strv_free(z);
|
|
|
|
r = ask_password_auto("Please enter image passphrase!", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to query for passphrase: %m");
|
|
|
|
passphrase = z[0];
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
static int deferred_remove(DecryptedPartition *p) {
|
|
|
|
struct dm_ioctl dm = {
|
|
.version = {
|
|
DM_VERSION_MAJOR,
|
|
DM_VERSION_MINOR,
|
|
DM_VERSION_PATCHLEVEL
|
|
},
|
|
.data_size = sizeof(dm),
|
|
.flags = DM_DEFERRED_REMOVE,
|
|
};
|
|
|
|
_cleanup_close_ int fd = -1;
|
|
|
|
assert(p);
|
|
|
|
/* Unfortunately, libcryptsetup doesn't provide a proper API for this, hence call the ioctl() directly. */
|
|
|
|
fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
strncpy(dm.name, p->name, sizeof(dm.name));
|
|
|
|
if (ioctl(fd, DM_DEV_REMOVE, &dm))
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int decrypted_image_relinquish(DecryptedImage *d) {
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
size_t i;
|
|
int r;
|
|
#endif
|
|
|
|
assert(d);
|
|
|
|
/* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so
|
|
* that we don't clean it up ourselves either anymore */
|
|
|
|
#ifdef HAVE_LIBCRYPTSETUP
|
|
for (i = 0; i < d->n_decrypted; i++) {
|
|
DecryptedPartition *p = d->decrypted + i;
|
|
|
|
if (p->relinquished)
|
|
continue;
|
|
|
|
r = deferred_remove(p);
|
|
if (r < 0)
|
|
return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
|
|
|
|
p->relinquished = true;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char *const partition_designator_table[] = {
|
|
[PARTITION_ROOT] = "root",
|
|
[PARTITION_ROOT_SECONDARY] = "root-secondary",
|
|
[PARTITION_HOME] = "home",
|
|
[PARTITION_SRV] = "srv",
|
|
[PARTITION_ESP] = "esp",
|
|
[PARTITION_SWAP] = "swap",
|
|
[PARTITION_ROOT_VERITY] = "root-verity",
|
|
[PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(partition_designator, int);
|