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systemd/src/shared/bootspec.c
Zbigniew Jędrzejewski-Szmek 7f42be65b9 bootspec: remove now-unused boot_entry_type_table
2019-04-05 13:50:45 +02:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <stdio.h>
#include <linux/magic.h>
#include <unistd.h>
#include "sd-device.h"
#include "sd-id128.h"
#include "alloc-util.h"
#include "blkid-util.h"
#include "bootspec.h"
#include "conf-files.h"
#include "def.h"
#include "device-nodes.h"
#include "dirent-util.h"
#include "efivars.h"
#include "env-file.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "parse-util.h"
#include "path-util.h"
#include "pe-header.h"
#include "sort-util.h"
#include "stat-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "unaligned.h"
#include "util.h"
#include "virt.h"
static void boot_entry_free(BootEntry *entry) {
assert(entry);
free(entry->id);
free(entry->path);
free(entry->root);
free(entry->title);
free(entry->show_title);
free(entry->version);
free(entry->machine_id);
free(entry->architecture);
strv_free(entry->options);
free(entry->kernel);
free(entry->efi);
strv_free(entry->initrd);
free(entry->device_tree);
}
static int boot_entry_load(
const char *root,
const char *path,
BootEntry *entry) {
_cleanup_(boot_entry_free) BootEntry tmp = {
.type = BOOT_ENTRY_CONF,
};
_cleanup_fclose_ FILE *f = NULL;
unsigned line = 1;
char *b, *c;
int r;
assert(root);
assert(path);
assert(entry);
c = endswith_no_case(path, ".conf");
if (!c)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid loader entry file suffix: %s", path);
b = basename(path);
tmp.id = strndup(b, c - b);
if (!tmp.id)
return log_oom();
if (!efi_loader_entry_name_valid(tmp.id))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid loader entry filename: %s", path);
tmp.path = strdup(path);
if (!tmp.path)
return log_oom();
tmp.root = strdup(root);
if (!tmp.root)
return log_oom();
f = fopen(path, "re");
if (!f)
return log_error_errno(errno, "Failed to open \"%s\": %m", path);
for (;;) {
_cleanup_free_ char *buf = NULL, *field = NULL;
const char *p;
r = read_line(f, LONG_LINE_MAX, &buf);
if (r == 0)
break;
if (r == -ENOBUFS)
return log_error_errno(r, "%s:%u: Line too long", path, line);
if (r < 0)
return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
line++;
if (IN_SET(*strstrip(buf), '#', '\0'))
continue;
p = buf;
r = extract_first_word(&p, &field, " \t", 0);
if (r < 0) {
log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
continue;
}
if (r == 0) {
log_warning("%s:%u: Bad syntax", path, line);
continue;
}
if (streq(field, "title"))
r = free_and_strdup(&tmp.title, p);
else if (streq(field, "version"))
r = free_and_strdup(&tmp.version, p);
else if (streq(field, "machine-id"))
r = free_and_strdup(&tmp.machine_id, p);
else if (streq(field, "architecture"))
r = free_and_strdup(&tmp.architecture, p);
else if (streq(field, "options"))
r = strv_extend(&tmp.options, p);
else if (streq(field, "linux"))
r = free_and_strdup(&tmp.kernel, p);
else if (streq(field, "efi"))
r = free_and_strdup(&tmp.efi, p);
else if (streq(field, "initrd"))
r = strv_extend(&tmp.initrd, p);
else if (streq(field, "devicetree"))
r = free_and_strdup(&tmp.device_tree, p);
else {
log_notice("%s:%u: Unknown line \"%s\", ignoring.", path, line, field);
continue;
}
if (r < 0)
return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
}
*entry = tmp;
tmp = (BootEntry) {};
return 0;
}
void boot_config_free(BootConfig *config) {
size_t i;
assert(config);
free(config->default_pattern);
free(config->timeout);
free(config->editor);
free(config->auto_entries);
free(config->auto_firmware);
free(config->console_mode);
free(config->entry_oneshot);
free(config->entry_default);
for (i = 0; i < config->n_entries; i++)
boot_entry_free(config->entries + i);
free(config->entries);
}
static int boot_loader_read_conf(const char *path, BootConfig *config) {
_cleanup_fclose_ FILE *f = NULL;
unsigned line = 1;
int r;
assert(path);
assert(config);
f = fopen(path, "re");
if (!f) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open \"%s\": %m", path);
}
for (;;) {
_cleanup_free_ char *buf = NULL, *field = NULL;
const char *p;
r = read_line(f, LONG_LINE_MAX, &buf);
if (r == 0)
break;
if (r == -ENOBUFS)
return log_error_errno(r, "%s:%u: Line too long", path, line);
if (r < 0)
return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
line++;
if (IN_SET(*strstrip(buf), '#', '\0'))
continue;
p = buf;
r = extract_first_word(&p, &field, " \t", 0);
if (r < 0) {
log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
continue;
}
if (r == 0) {
log_warning("%s:%u: Bad syntax", path, line);
continue;
}
if (streq(field, "default"))
r = free_and_strdup(&config->default_pattern, p);
else if (streq(field, "timeout"))
r = free_and_strdup(&config->timeout, p);
else if (streq(field, "editor"))
r = free_and_strdup(&config->editor, p);
else if (streq(field, "auto-entries"))
r = free_and_strdup(&config->auto_entries, p);
else if (streq(field, "auto-firmware"))
r = free_and_strdup(&config->auto_firmware, p);
else if (streq(field, "console-mode"))
r = free_and_strdup(&config->console_mode, p);
else {
log_notice("%s:%u: Unknown line \"%s\", ignoring.", path, line, field);
continue;
}
if (r < 0)
return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
}
return 1;
}
static int boot_entry_compare(const BootEntry *a, const BootEntry *b) {
return str_verscmp(a->id, b->id);
}
static int boot_entries_find(
const char *root,
const char *dir,
BootEntry **entries,
size_t *n_entries) {
_cleanup_strv_free_ char **files = NULL;
size_t n_allocated = *n_entries;
char **f;
int r;
assert(root);
assert(dir);
assert(entries);
assert(n_entries);
r = conf_files_list(&files, ".conf", NULL, 0, dir, NULL);
if (r < 0)
return log_error_errno(r, "Failed to list files in \"%s\": %m", dir);
STRV_FOREACH(f, files) {
if (!GREEDY_REALLOC0(*entries, n_allocated, *n_entries + 1))
return log_oom();
r = boot_entry_load(root, *f, *entries + *n_entries);
if (r < 0)
continue;
(*n_entries) ++;
}
return 0;
}
static int boot_entry_load_unified(
const char *root,
const char *path,
const char *osrelease,
const char *cmdline,
BootEntry *ret) {
_cleanup_free_ char *os_pretty_name = NULL, *os_id = NULL, *version_id = NULL, *build_id = NULL;
_cleanup_(boot_entry_free) BootEntry tmp = {
.type = BOOT_ENTRY_UNIFIED,
};
_cleanup_fclose_ FILE *f = NULL;
const char *k;
int r;
assert(root);
assert(path);
assert(osrelease);
k = path_startswith(path, root);
if (!k)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Path is not below root: %s", path);
f = fmemopen((void*) osrelease, strlen(osrelease), "r");
if (!f)
return log_error_errno(errno, "Failed to open os-release buffer: %m");
r = parse_env_file(f, "os-release",
"PRETTY_NAME", &os_pretty_name,
"ID", &os_id,
"VERSION_ID", &version_id,
"BUILD_ID", &build_id);
if (r < 0)
return log_error_errno(r, "Failed to parse os-release data from unified kernel image %s: %m", path);
if (!os_pretty_name || !os_id || !(version_id || build_id))
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Missing fields in os-release data from unified kernel image %s, refusing.", path);
tmp.id = strjoin(os_id, "-", version_id ?: build_id);
if (!tmp.id)
return log_oom();
if (!efi_loader_entry_name_valid(tmp.id))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid loader entry: %s", tmp.id);
tmp.path = strdup(path);
if (!tmp.path)
return log_oom();
tmp.root = strdup(root);
if (!tmp.root)
return log_oom();
tmp.kernel = strdup(skip_leading_chars(k, "/"));
if (!tmp.kernel)
return log_oom();
tmp.options = strv_new(skip_leading_chars(cmdline, WHITESPACE));
if (!tmp.options)
return log_oom();
delete_trailing_chars(tmp.options[0], WHITESPACE);
tmp.title = TAKE_PTR(os_pretty_name);
*ret = tmp;
tmp = (BootEntry) {};
return 0;
}
/* Maximum PE section we are willing to load (Note that sections we are not interested in may be larger, but
* the ones we do care about and we are willing to load into memory have this size limit.) */
#define PE_SECTION_SIZE_MAX (4U*1024U*1024U)
static int find_sections(
int fd,
char **ret_osrelease,
char **ret_cmdline) {
_cleanup_free_ struct PeSectionHeader *sections = NULL;
_cleanup_free_ char *osrelease = NULL, *cmdline = NULL;
size_t i, n_sections;
struct DosFileHeader dos;
struct PeHeader pe;
uint64_t start;
ssize_t n;
n = pread(fd, &dos, sizeof(dos), 0);
if (n < 0)
return log_error_errno(errno, "Failed read DOS header: %m");
if (n != sizeof(dos))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading DOS header, refusing.");
if (dos.Magic[0] != 'M' || dos.Magic[1] != 'Z')
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "DOS executable magic missing, refusing.");
start = unaligned_read_le32(&dos.ExeHeader);
n = pread(fd, &pe, sizeof(pe), start);
if (n < 0)
return log_error_errno(errno, "Failed to read PE header: %m");
if (n != sizeof(pe))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading PE header, refusing.");
if (pe.Magic[0] != 'P' || pe.Magic[1] != 'E' || pe.Magic[2] != 0 || pe.Magic[3] != 0)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "PE executable magic missing, refusing.");
n_sections = unaligned_read_le16(&pe.FileHeader.NumberOfSections);
if (n_sections > 96)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "PE header has too many sections, refusing.");
sections = new(struct PeSectionHeader, n_sections);
if (!sections)
return log_oom();
n = pread(fd, sections,
n_sections * sizeof(struct PeSectionHeader),
start + sizeof(pe) + unaligned_read_le16(&pe.FileHeader.SizeOfOptionalHeader));
if (n < 0)
return log_error_errno(errno, "Failed to read section data: %m");
if ((size_t) n != n_sections * sizeof(struct PeSectionHeader))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading sections, refusing.");
for (i = 0; i < n_sections; i++) {
_cleanup_free_ char *k = NULL;
uint32_t offset, size;
char **b;
if (strneq((char*) sections[i].Name, ".osrel", sizeof(sections[i].Name)))
b = &osrelease;
else if (strneq((char*) sections[i].Name, ".cmdline", sizeof(sections[i].Name)))
b = &cmdline;
else
continue;
if (*b)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Duplicate section %s, refusing.", sections[i].Name);
offset = unaligned_read_le32(&sections[i].PointerToRawData);
size = unaligned_read_le32(&sections[i].VirtualSize);
if (size > PE_SECTION_SIZE_MAX)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Section %s too large, refusing.", sections[i].Name);
k = new(char, size+1);
if (!k)
return log_oom();
n = pread(fd, k, size, offset);
if (n < 0)
return log_error_errno(errno, "Failed to read section payload: %m");
if ((size_t) n != size)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading section payload, refusing:");
/* Allow one trailing NUL byte, but nothing more. */
if (size > 0 && memchr(k, 0, size - 1))
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Section contains embedded NUL byte: %m");
k[size] = 0;
*b = TAKE_PTR(k);
}
if (!osrelease)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Image lacks .osrel section, refusing.");
if (ret_osrelease)
*ret_osrelease = TAKE_PTR(osrelease);
if (ret_cmdline)
*ret_cmdline = TAKE_PTR(cmdline);
return 0;
}
static int boot_entries_find_unified(
const char *root,
const char *dir,
BootEntry **entries,
size_t *n_entries) {
_cleanup_(closedirp) DIR *d = NULL;
size_t n_allocated = *n_entries;
struct dirent *de;
int r;
assert(root);
assert(dir);
assert(entries);
assert(n_entries);
d = opendir(dir);
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open %s: %m", dir);
}
FOREACH_DIRENT(de, d, return log_error_errno(errno, "Failed to read %s: %m", dir)) {
_cleanup_free_ char *j = NULL, *osrelease = NULL, *cmdline = NULL;
_cleanup_close_ int fd = -1;
if (!dirent_is_file(de))
continue;
if (!endswith_no_case(de->d_name, ".efi"))
continue;
if (!GREEDY_REALLOC0(*entries, n_allocated, *n_entries + 1))
return log_oom();
fd = openat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0) {
log_warning_errno(errno, "Failed to open %s/%s, ignoring: %m", dir, de->d_name);
continue;
}
r = fd_verify_regular(fd);
if (r < 0) {
log_warning_errno(r, "File %s/%s is not regular, ignoring: %m", dir, de->d_name);
continue;
}
r = find_sections(fd, &osrelease, &cmdline);
if (r < 0)
continue;
j = path_join(dir, de->d_name);
if (!j)
return log_oom();
r = boot_entry_load_unified(root, j, osrelease, cmdline, *entries + *n_entries);
if (r < 0)
continue;
(*n_entries) ++;
}
return 0;
}
static bool find_nonunique(BootEntry *entries, size_t n_entries, bool *arr) {
size_t i, j;
bool non_unique = false;
assert(entries || n_entries == 0);
assert(arr || n_entries == 0);
for (i = 0; i < n_entries; i++)
arr[i] = false;
for (i = 0; i < n_entries; i++)
for (j = 0; j < n_entries; j++)
if (i != j && streq(boot_entry_title(entries + i),
boot_entry_title(entries + j)))
non_unique = arr[i] = arr[j] = true;
return non_unique;
}
static int boot_entries_uniquify(BootEntry *entries, size_t n_entries) {
char *s;
size_t i;
int r;
bool arr[n_entries];
assert(entries || n_entries == 0);
/* Find _all_ non-unique titles */
if (!find_nonunique(entries, n_entries, arr))
return 0;
/* Add version to non-unique titles */
for (i = 0; i < n_entries; i++)
if (arr[i] && entries[i].version) {
r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].version);
if (r < 0)
return -ENOMEM;
free_and_replace(entries[i].show_title, s);
}
if (!find_nonunique(entries, n_entries, arr))
return 0;
/* Add machine-id to non-unique titles */
for (i = 0; i < n_entries; i++)
if (arr[i] && entries[i].machine_id) {
r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].machine_id);
if (r < 0)
return -ENOMEM;
free_and_replace(entries[i].show_title, s);
}
if (!find_nonunique(entries, n_entries, arr))
return 0;
/* Add file name to non-unique titles */
for (i = 0; i < n_entries; i++)
if (arr[i]) {
r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].id);
if (r < 0)
return -ENOMEM;
free_and_replace(entries[i].show_title, s);
}
return 0;
}
static int boot_entries_select_default(const BootConfig *config) {
int i;
assert(config);
assert(config->entries || config->n_entries == 0);
if (config->n_entries == 0) {
log_debug("Found no default boot entry :(");
return -1; /* -1 means "no default" */
}
if (config->entry_oneshot)
for (i = config->n_entries - 1; i >= 0; i--)
if (streq(config->entry_oneshot, config->entries[i].id)) {
log_debug("Found default: id \"%s\" is matched by LoaderEntryOneShot",
config->entries[i].id);
return i;
}
if (config->entry_default)
for (i = config->n_entries - 1; i >= 0; i--)
if (streq(config->entry_default, config->entries[i].id)) {
log_debug("Found default: id \"%s\" is matched by LoaderEntryDefault",
config->entries[i].id);
return i;
}
if (config->default_pattern)
for (i = config->n_entries - 1; i >= 0; i--)
if (fnmatch(config->default_pattern, config->entries[i].id, FNM_CASEFOLD) == 0) {
log_debug("Found default: id \"%s\" is matched by pattern \"%s\"",
config->entries[i].id, config->default_pattern);
return i;
}
log_debug("Found default: last entry \"%s\"", config->entries[config->n_entries - 1].id);
return config->n_entries - 1;
}
int boot_entries_load_config(
const char *esp_path,
const char *xbootldr_path,
BootConfig *config) {
const char *p;
int r;
assert(config);
if (esp_path) {
p = strjoina(esp_path, "/loader/loader.conf");
r = boot_loader_read_conf(p, config);
if (r < 0)
return r;
p = strjoina(esp_path, "/loader/entries");
r = boot_entries_find(esp_path, p, &config->entries, &config->n_entries);
if (r < 0)
return r;
p = strjoina(esp_path, "/EFI/Linux/");
r = boot_entries_find_unified(esp_path, p, &config->entries, &config->n_entries);
if (r < 0)
return r;
}
if (xbootldr_path) {
p = strjoina(xbootldr_path, "/loader/entries");
r = boot_entries_find(xbootldr_path, p, &config->entries, &config->n_entries);
if (r < 0)
return r;
p = strjoina(xbootldr_path, "/EFI/Linux/");
r = boot_entries_find_unified(xbootldr_path, p, &config->entries, &config->n_entries);
if (r < 0)
return r;
}
typesafe_qsort(config->entries, config->n_entries, boot_entry_compare);
r = boot_entries_uniquify(config->entries, config->n_entries);
if (r < 0)
return log_error_errno(r, "Failed to uniquify boot entries: %m");
if (is_efi_boot()) {
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryOneShot", &config->entry_oneshot);
if (r < 0 && !IN_SET(r, -ENOENT, -ENODATA)) {
log_warning_errno(r, "Failed to read EFI variable \"LoaderEntryOneShot\": %m");
if (r == -ENOMEM)
return r;
}
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryDefault", &config->entry_default);
if (r < 0 && !IN_SET(r, -ENOENT, -ENODATA)) {
log_warning_errno(r, "Failed to read EFI variable \"LoaderEntryDefault\": %m");
if (r == -ENOMEM)
return r;
}
}
config->default_entry = boot_entries_select_default(config);
return 0;
}
int boot_entries_load_config_auto(
const char *override_esp_path,
const char *override_xbootldr_path,
BootConfig *config) {
_cleanup_free_ char *esp_where = NULL, *xbootldr_where = NULL;
int r;
assert(config);
/* This function is similar to boot_entries_load_config(), however we automatically search for the
* ESP and the XBOOTLDR partition unless it is explicitly specified. Also, if the user did not pass
* an ESP or XBOOTLDR path directly, let's see if /run/boot-loader-entries/ exists. If so, let's
* read data from there, as if it was an ESP (i.e. loading both entries and loader.conf data from
* it). This allows other boot loaders to pass boot loader entry information to our tools if they
* want to. */
if (!override_esp_path && !override_xbootldr_path) {
if (access("/run/boot-loader-entries/", F_OK) >= 0)
return boot_entries_load_config("/run/boot-loader-entries/", NULL, config);
if (errno != ENOENT)
return log_error_errno(errno,
"Failed to determine whether /run/boot-loader-entries/ exists: %m");
}
r = find_esp_and_warn(override_esp_path, false, &esp_where, NULL, NULL, NULL, NULL);
if (r < 0) /* we don't log about ENOKEY here, but propagate it, leaving it to the caller to log */
return r;
r = find_xbootldr_and_warn(override_xbootldr_path, false, &xbootldr_where, NULL);
if (r < 0 && r != -ENOKEY)
return r; /* It's fine if the XBOOTLDR partition doesn't exist, hence we ignore ENOKEY here */
return boot_entries_load_config(esp_where, xbootldr_where, config);
}
int boot_entries_augment_from_loader(BootConfig *config, bool only_auto) {
static const char * const title_table[] = {
/* Pretty names for a few well-known automatically discovered entries. */
"auto-osx", "macOS",
"auto-windows", "Windows Boot Manager",
"auto-efi-shell", "EFI Shell",
"auto-efi-default", "EFI Default Loader",
"auto-reboot-to-firmware-setup", "Reboot Into Firmware Interface",
};
_cleanup_strv_free_ char **found_by_loader = NULL;
size_t n_allocated;
char **i;
int r;
assert(config);
/* Let's add the entries discovered by the boot loader to the end of our list, unless they are
* already included there. */
r = efi_loader_get_entries(&found_by_loader);
if (IN_SET(r, -ENOENT, -EOPNOTSUPP))
return log_debug_errno(r, "Boot loader reported no entries.");
if (r < 0)
return log_error_errno(r, "Failed to determine entries reported by boot loader: %m");
n_allocated = config->n_entries;
STRV_FOREACH(i, found_by_loader) {
_cleanup_free_ char *c = NULL, *t = NULL, *p = NULL;
char **a, **b;
if (boot_config_has_entry(config, *i))
continue;
if (only_auto && !startswith(*i, "auto-"))
continue;
c = strdup(*i);
if (!c)
return log_oom();
STRV_FOREACH_PAIR(a, b, (char**) title_table)
if (streq(*a, *i)) {
t = strdup(*b);
if (!t)
return log_oom();
break;
}
p = efi_variable_path(EFI_VENDOR_LOADER, "LoaderEntries");
if (!p)
return log_oom();
if (!GREEDY_REALLOC0(config->entries, n_allocated, config->n_entries + 1))
return log_oom();
config->entries[config->n_entries++] = (BootEntry) {
.type = BOOT_ENTRY_LOADER,
.id = TAKE_PTR(c),
.title = TAKE_PTR(t),
.path = TAKE_PTR(p),
};
}
return 0;
}
/********************************************************************************/
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 = device_path_make_major_minor(S_IFBLK, devid, &node);
if (r < 0)
return log_error_errno(r, "Failed to format major/minor device path: %m");
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);
errno = 0;
r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
if (r != 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe file system type of \"%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);
errno = 0;
r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
if (r != 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition scheme of \"%s\": %m", 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 (!streq(v, "c12a7328-f81f-11d2-ba4b-00a0c93ec93b"))
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;
_cleanup_free_ char *node = NULL;
sd_id128_t uuid = SD_ID128_NULL;
uint64_t pstart = 0, psize = 0;
uint32_t part = 0;
const char *v;
int r;
r = device_path_make_major_minor(S_IFBLK, devid, &node);
if (r < 0)
return log_error_errno(r, "Failed to format major/minor device path: %m");
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_property_value(d, "ID_FS_TYPE", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
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 = sd_device_get_property_value(d, "ID_PART_ENTRY_SCHEME", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
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);
r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
if (!streq(v, "c12a7328-f81f-11d2-ba4b-00a0c93ec93b"))
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);
r = sd_device_get_property_value(d, "ID_PART_ENTRY_UUID", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
r = sd_id128_from_string(v, &uuid);
if (r < 0)
return log_error_errno(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_error_errno(r, "Failed to get device property: %m");
r = safe_atou32(v, &part);
if (r < 0)
return log_error_errno(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_error_errno(r, "Failed to get device property: %m");
r = safe_atou64(v, &pstart);
if (r < 0)
return log_error_errno(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_error_errno(r, "Failed to get device property: %m");
r = safe_atou64(v, &psize);
if (r < 0)
return log_error_errno(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) {
struct stat st, st2;
const char *t2, *trigger;
int r;
assert(path);
assert(ret_dev);
/* 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 */
trigger = strjoina(path, "/trigger"); /* Filename doesn't matter... */
(void) access(trigger, F_OK);
if (stat(path, &st) < 0)
return log_full_errno((searching && errno == ENOENT) ||
(unprivileged_mode && errno == EACCES) ? LOG_DEBUG : LOG_ERR, errno,
"Failed to determine block device node of \"%s\": %m", path);
if (major(st.st_dev) == 0)
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
SYNTHETIC_ERRNO(searching ? EADDRNOTAVAIL : ENODEV),
"Block device node of \"%s\" is invalid.", path);
t2 = strjoina(path, "/..");
if (stat(t2, &st2) < 0) {
if (errno != EACCES)
r = -errno;
else {
_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. */
parent = dirname_malloc(path);
if (!parent)
return log_oom();
if (stat(parent, &st2) < 0)
r = -errno;
else
r = 0;
}
if (r < 0)
return log_full_errno(unprivileged_mode && r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
"Failed to determine block device node of parent of \"%s\": %m", path);
}
if (st.st_dev == st2.st_dev)
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);
if (ret_dev)
*ret_dev = st.st_dev;
return 0;
}
static int verify_esp(
const char *p,
bool searching,
bool unprivileged_mode,
uint32_t *ret_part,
uint64_t *ret_pstart,
uint64_t *ret_psize,
sd_id128_t *ret_uuid) {
bool relax_checks;
dev_t devid;
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 acessing the thing
*/
relax_checks = getenv_bool("SYSTEMD_RELAX_ESP_CHECKS") > 0;
/* Non-root user can only check the status, so if an error occured 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);
}
r = verify_fsroot_dir(p, searching, unprivileged_mode, &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 (detect_container() > 0 || 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)
return verify_esp_udev(devid, searching, ret_part, ret_pstart, ret_psize, ret_uuid);
else
return verify_esp_blkid(devid, searching, ret_part, ret_pstart, ret_psize, ret_uuid);
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;
return 0;
}
int find_esp_and_warn(
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) {
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 = verify_esp(path, false, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
if (r < 0)
return r;
goto found;
}
path = getenv("SYSTEMD_ESP_PATH");
if (path) {
if (!path_is_valid(path) || !path_is_absolute(path))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"$SYSTEMD_ESP_PATH does not refer to absolute path, refusing to use it: %s",
path);
/* Note: when the user explicitly configured things with an env var we won't validate the mount
* point. After all we want this to be useful for testing. */
goto found;
}
FOREACH_STRING(path, "/efi", "/boot", "/boot/efi") {
r = verify_esp(path, true, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
if (r >= 0)
goto found;
if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL)) /* This one is not it */
return r;
}
/* No logging here */
return -ENOKEY;
found:
if (ret_path) {
char *c;
c = strdup(path);
if (!c)
return log_oom();
*ret_path = c;
}
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 *v;
int r;
r = device_path_make_major_minor(S_IFBLK, devid, &node);
if (r < 0)
return log_error_errno(r, "Failed to format major/minor device path: %m");
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_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);
errno = 0;
r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
if (r != 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition scheme of \"%s\": %m", node);
if (streq(v, "gpt")) {
errno = 0;
r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
if (r != 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition type UUID of \"%s\": %m", node);
if (!streq(v, "bc13c2ff-59e6-4262-a352-b275fd6f7172"))
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" has wrong type for extended boot loader partition.", 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);
} else if (streq(v, "dos")) {
errno = 0;
r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
if (r != 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe partition type UUID of \"%s\": %m", node);
if (!streq(v, "0xea"))
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" has wrong type for extended boot loader partition.", node);
} else
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" is not on a GPT or DOS partition table.", node);
#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;
_cleanup_free_ char *node = NULL;
sd_id128_t uuid = SD_ID128_NULL;
const char *v;
int r;
r = device_path_make_major_minor(S_IFBLK, devid, &node);
if (r < 0)
return log_error_errno(r, "Failed to format major/minor device path: %m");
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_property_value(d, "ID_PART_ENTRY_SCHEME", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
if (streq(v, "gpt")) {
r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
if (!streq(v, "bc13c2ff-59e6-4262-a352-b275fd6f7172"))
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" has wrong type for extended boot loader partition.", node);
r = sd_device_get_property_value(d, "ID_PART_ENTRY_UUID", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
r = sd_id128_from_string(v, &uuid);
if (r < 0)
return log_error_errno(r, "Partition \"%s\" has invalid UUID \"%s\".", node, v);
} else if (streq(v, "dos")) {
r = sd_device_get_property_value(d, "ID_PART_ENTRY_TYPE", &v);
if (r < 0)
return log_error_errno(r, "Failed to get device property: %m");
if (!streq(v, "0xea"))
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" has wrong type for extended boot loader partition.", node);
} else
return log_full_errno(searching ? LOG_DEBUG : LOG_ERR,
searching ? SYNTHETIC_ERRNO(EADDRNOTAVAIL) : SYNTHETIC_ERRNO(ENODEV),
"File system \"%s\" is not on a GPT or DOS partition table.", node);
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) {
bool relax_checks;
dev_t devid;
int r;
assert(p);
relax_checks = getenv_bool("SYSTEMD_RELAX_XBOOTLDR_CHECKS") > 0;
r = verify_fsroot_dir(p, searching, unprivileged_mode, &devid);
if (r < 0)
return r;
if (detect_container() > 0 || relax_checks)
goto finish;
if (unprivileged_mode)
return verify_xbootldr_udev(devid, searching, ret_uuid);
else
return verify_xbootldr_blkid(devid, searching, ret_uuid);
finish:
if (ret_uuid)
*ret_uuid = SD_ID128_NULL;
return 0;
}
int find_xbootldr_and_warn(
const char *path,
bool unprivileged_mode,
char **ret_path,
sd_id128_t *ret_uuid) {
int r;
/* Similar to find_esp_and_warn(), but finds the XBOOTLDR partition. Returns the same errors. */
if (path) {
r = verify_xbootldr(path, false, unprivileged_mode, ret_uuid);
if (r < 0)
return r;
goto found;
}
path = getenv("SYSTEMD_XBOOTLDR_PATH");
if (path) {
if (!path_is_valid(path) || !path_is_absolute(path))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"$SYSTEMD_XBOOTLDR_PATH does not refer to absolute path, refusing to use it: %s",
path);
goto found;
}
r = verify_xbootldr("/boot", true, unprivileged_mode, ret_uuid);
if (r >= 0) {
path = "/boot";
goto found;
}
if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL)) /* This one is not it */
return r;
return -ENOKEY;
found:
if (ret_path) {
char *c;
c = strdup(path);
if (!c)
return log_oom();
*ret_path = c;
}
return 0;
}
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