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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "device-nodes.h"
#include "fstab-util.h"
#include "hibernate-resume-config.h"
#include "json.h"
#include "os-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "efivars.h"
static KernelHibernateLocation* kernel_hibernate_location_free(KernelHibernateLocation *k) {
if (!k)
return NULL;
free(k->device);
return mfree(k);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(KernelHibernateLocation*, kernel_hibernate_location_free);
static EFIHibernateLocation* efi_hibernate_location_free(EFIHibernateLocation *e) {
if (!e)
return NULL;
free(e->device);
free(e->kernel_version);
free(e->id);
free(e->image_id);
free(e->image_version);
return mfree(e);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(EFIHibernateLocation*, efi_hibernate_location_free);
void hibernate_info_done(HibernateInfo *info) {
assert(info);
kernel_hibernate_location_free(info->cmdline);
efi_hibernate_location_free(info->efi);
}
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
KernelHibernateLocation *k = ASSERT_PTR(data);
int r;
assert(key);
if (streq(key, "resume")) {
_cleanup_free_ char *d = NULL;
if (proc_cmdline_value_missing(key, value))
return 0;
d = fstab_node_to_udev_node(value);
if (!d)
return log_oom();
free_and_replace(k->device, d);
} else if (proc_cmdline_key_streq(key, "resume_offset")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = safe_atou64(value, &k->offset);
if (r < 0)
return log_error_errno(r, "Failed to parse resume_offset=%s: %m", value);
k->offset_set = true;
}
return 0;
}
static int get_kernel_hibernate_location(KernelHibernateLocation **ret) {
_cleanup_(kernel_hibernate_location_freep) KernelHibernateLocation *k = NULL;
int r;
assert(ret);
k = new0(KernelHibernateLocation, 1);
if (!k)
return log_oom();
r = proc_cmdline_parse(parse_proc_cmdline_item, k, 0);
if (r < 0)
return log_error_errno(r, "Failed to parse kernel command line: %m");
if (!k->device) {
if (k->offset_set)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Found resume_offset=%" PRIu64 " but resume= is unset, refusing.",
k->offset);
*ret = NULL;
return 0;
}
*ret = TAKE_PTR(k);
return 1;
}
#if ENABLE_EFI
static bool validate_efi_hibernate_location(EFIHibernateLocation *e) {
_cleanup_free_ char *id = NULL, *image_id = NULL;
int r;
assert(e);
r = parse_os_release(NULL,
"ID", &id,
"IMAGE_ID", &image_id);
if (r < 0)
log_warning_errno(r, "Failed to parse os-release: %m");
if (!streq_ptr(id, e->id) ||
!streq_ptr(image_id, e->image_id)) {
log_notice("HibernateLocation system identifier doesn't match currently running system, not resuming from it.");
return false;
}
/*
* Note that we accept kernel version mismatches. Linux writes the old kernel to disk as part of the
* hibernation image, and thus resuming means the short-lived kernel that reads the image from the
* disk will be replaced by the original kernel and effectively removed from memory as part of that.
*/
return true;
}
static int get_efi_hibernate_location(EFIHibernateLocation **ret) {
static const JsonDispatch dispatch_table[] = {
{ "uuid", JSON_VARIANT_STRING, json_dispatch_id128, offsetof(EFIHibernateLocation, uuid), JSON_MANDATORY },
{ "offset", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint64, offsetof(EFIHibernateLocation, offset), JSON_MANDATORY },
{ "kernelVersion", JSON_VARIANT_STRING, json_dispatch_string, offsetof(EFIHibernateLocation, kernel_version), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseId", JSON_VARIANT_STRING, json_dispatch_string, offsetof(EFIHibernateLocation, id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseImageId", JSON_VARIANT_STRING, json_dispatch_string, offsetof(EFIHibernateLocation, image_id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseVersionId", JSON_VARIANT_STRING, json_dispatch_string, offsetof(EFIHibernateLocation, version_id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseImageVersion", JSON_VARIANT_STRING, json_dispatch_string, offsetof(EFIHibernateLocation, image_version), JSON_PERMISSIVE|JSON_DEBUG },
{},
};
_cleanup_(efi_hibernate_location_freep) EFIHibernateLocation *e = NULL;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_free_ char *location_str = NULL;
int r;
assert(ret);
if (!is_efi_boot())
goto skip;
r = efi_get_variable_string(EFI_SYSTEMD_VARIABLE(HibernateLocation), &location_str);
if (r == -ENOENT) {
log_debug_errno(r, "EFI variable HibernateLocation is not set, skipping.");
goto skip;
}
if (r < 0)
return log_error_errno(r, "Failed to get EFI variable HibernateLocation: %m");
r = json_parse(location_str, 0, &v, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to parse HibernateLocation JSON object: %m");
e = new0(EFIHibernateLocation, 1);
if (!e)
return log_oom();
r = json_dispatch(v, dispatch_table, JSON_LOG, e);
if (r < 0)
return r;
log_info("Reported hibernation image:%s%s%s%s%s%s%s%s%s%s UUID="SD_ID128_UUID_FORMAT_STR" offset=%"PRIu64,
e->id ? " ID=" : "", strempty(e->id),
e->image_id ? " IMAGE_ID=" : "", strempty(e->image_id),
e->version_id ? " VERSION_ID=" : "", strempty(e->version_id),
e->image_version ? " IMAGE_VERSION=" : "", strempty(e->image_version),
e->kernel_version ? " kernel=" : "", strempty(e->kernel_version),
SD_ID128_FORMAT_VAL(e->uuid),
e->offset);
if (!validate_efi_hibernate_location(e))
goto skip;
if (asprintf(&e->device, "/dev/disk/by-uuid/" SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(e->uuid)) < 0)
return log_oom();
*ret = TAKE_PTR(e);
return 1;
skip:
*ret = NULL;
return 0;
}
void compare_hibernate_location_and_warn(const HibernateInfo *info) {
int r;
assert(info);
if (!info->cmdline || !info->efi)
return;
assert(info->device == info->cmdline->device);
if (!path_equal(info->cmdline->device, info->efi->device)) {
r = devnode_same(info->cmdline->device, info->efi->device);
if (r < 0)
log_warning_errno(r,
"Failed to check if resume=%s is the same device as EFI HibernateLocation device '%s', ignoring: %m",
info->cmdline->device, info->efi->device);
if (r == 0)
log_warning("resume=%s doesn't match with EFI HibernateLocation device '%s', proceeding anyway with resume=.",
info->cmdline->device, info->efi->device);
}
if (info->cmdline->offset != info->efi->offset)
log_warning("resume_offset=%" PRIu64 " doesn't match with EFI HibernateLocation offset %" PRIu64 ", proceeding anyway with resume_offset=.",
info->cmdline->offset, info->efi->offset);
}
void clear_efi_hibernate_location(void) {
int r;
if (!is_efi_boot())
return;
r = efi_set_variable(EFI_SYSTEMD_VARIABLE(HibernateLocation), NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to clear EFI variable HibernateLocation, ignoring: %m");
}
#endif
int acquire_hibernate_info(HibernateInfo *ret) {
_cleanup_(hibernate_info_done) HibernateInfo i = {};
int r;
r = get_kernel_hibernate_location(&i.cmdline);
if (r < 0)
return r;
#if ENABLE_EFI
r = get_efi_hibernate_location(&i.efi);
if (r < 0)
return r;
#endif
if (i.cmdline) {
i.device = i.cmdline->device;
i.offset = i.cmdline->offset;
} else if (i.efi) {
i.device = i.efi->device;
i.offset = i.efi->offset;
} else
return -ENODEV;
*ret = TAKE_STRUCT(i);
return 0;
}
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