edda44605f
This makes hibernation unavailable if the kernel image we are currently running was removed. This is supposed to be superficial protection against hibernating a system we can never return from because the kernel has been updated and the kernel we currently run is not available anymore. We look at a couple of places for the kernel, which should cover all distributions I know off. Should I have missed a path I am sure people will quickly notice and we can add more places to check. (or maybe convince those distros to stick their kernels at a standard place)
479 lines
17 KiB
C
479 lines
17 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2018 Dell Inc.
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***/
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#include <errno.h>
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#include <linux/fs.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/utsname.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "sd-id128.h"
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "def.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "sleep-config.h"
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#include "string-util.h"
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#include "strv.h"
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int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t *_delay) {
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_cleanup_strv_free_ char
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**suspend_mode = NULL, **suspend_state = NULL,
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**hibernate_mode = NULL, **hibernate_state = NULL,
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**hybrid_mode = NULL, **hybrid_state = NULL;
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_cleanup_strv_free_ char **modes, **states; /* always initialized below */
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usec_t delay = 180 * USEC_PER_MINUTE;
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const ConfigTableItem items[] = {
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{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
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{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
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{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
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{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
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{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
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{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
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{ "Sleep", "HibernateDelaySec", config_parse_sec, 0, &delay},
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{}
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};
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(void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf",
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CONF_PATHS_NULSTR("systemd/sleep.conf.d"),
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"Sleep\0", config_item_table_lookup, items,
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CONFIG_PARSE_WARN, NULL);
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if (streq(verb, "suspend")) {
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/* empty by default */
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modes = TAKE_PTR(suspend_mode);
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if (suspend_state)
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states = TAKE_PTR(suspend_state);
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else
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states = strv_new("mem", "standby", "freeze", NULL);
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} else if (streq(verb, "hibernate")) {
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if (hibernate_mode)
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modes = TAKE_PTR(hibernate_mode);
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else
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modes = strv_new("platform", "shutdown", NULL);
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if (hibernate_state)
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states = TAKE_PTR(hibernate_state);
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else
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states = strv_new("disk", NULL);
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} else if (streq(verb, "hybrid-sleep")) {
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if (hybrid_mode)
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modes = TAKE_PTR(hybrid_mode);
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else
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modes = strv_new("suspend", "platform", "shutdown", NULL);
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if (hybrid_state)
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states = TAKE_PTR(hybrid_state);
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else
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states = strv_new("disk", NULL);
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} else if (streq(verb, "suspend-then-hibernate"))
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modes = states = NULL;
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else
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assert_not_reached("what verb");
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if ((!modes && STR_IN_SET(verb, "hibernate", "hybrid-sleep")) ||
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(!states && !streq(verb, "suspend-then-hibernate")))
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return log_oom();
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if (_modes)
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*_modes = TAKE_PTR(modes);
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if (_states)
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*_states = TAKE_PTR(states);
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if (_delay)
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*_delay = delay;
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return 0;
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}
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int can_sleep_state(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/state", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/state", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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}
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return false;
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}
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int can_sleep_disk(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/disk", W_OK) < 0) {
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log_debug_errno(errno, "/sys/power/disk is not writable: %m");
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return false;
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}
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r = read_one_line_file("/sys/power/disk", &p);
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if (r < 0) {
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log_debug_errno(r, "Couldn't read /sys/power/disk: %m");
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return false;
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}
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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if (l == k + 2 &&
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word[0] == '[' &&
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memcmp(word + 1, *type, l - 2) == 0 &&
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word[l-1] == ']')
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return true;
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}
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}
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return false;
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}
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#define HIBERNATION_SWAP_THRESHOLD 0.98
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int find_hibernate_location(char **device, char **type, size_t *size, size_t *used) {
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_cleanup_fclose_ FILE *f;
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unsigned i;
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f = fopen("/proc/swaps", "re");
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if (!f) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"Failed to retrieve open /proc/swaps: %m");
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assert(errno > 0);
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return -errno;
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}
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(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
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for (i = 1;; i++) {
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_cleanup_free_ char *dev_field = NULL, *type_field = NULL;
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size_t size_field, used_field;
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int k;
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k = fscanf(f,
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"%ms " /* device/file */
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"%ms " /* type of swap */
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"%zu " /* swap size */
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"%zu " /* used */
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"%*i\n", /* priority */
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&dev_field, &type_field, &size_field, &used_field);
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if (k == EOF)
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break;
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if (k != 4) {
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log_warning("Failed to parse /proc/swaps:%u", i);
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continue;
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}
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if (streq(type_field, "file")) {
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if (endswith(dev_field, "\\040(deleted)")) {
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log_warning("Ignoring deleted swap file '%s'.", dev_field);
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continue;
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}
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} else if (streq(type_field, "partition")) {
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const char *fn;
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fn = path_startswith(dev_field, "/dev/");
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if (fn && startswith(fn, "zram")) {
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log_debug("Ignoring compressed RAM swap device '%s'.", dev_field);
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continue;
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}
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}
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if (device)
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*device = TAKE_PTR(dev_field);
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if (type)
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*type = TAKE_PTR(type_field);
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if (size)
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*size = size_field;
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if (used)
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*used = used_field;
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return 0;
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}
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log_debug("No swap partitions were found.");
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return -ENOSYS;
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}
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static bool enough_swap_for_hibernation(void) {
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_cleanup_free_ char *active = NULL;
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unsigned long long act = 0;
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size_t size = 0, used = 0;
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int r;
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if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
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return true;
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r = find_hibernate_location(NULL, NULL, &size, &used);
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if (r < 0)
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return false;
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r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active);
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if (r < 0) {
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log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
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return false;
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}
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r = safe_atollu(active, &act);
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if (r < 0) {
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log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
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active);
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return false;
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}
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r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
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log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
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r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
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return r;
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}
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static int kernel_exists(void) {
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struct utsname u;
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sd_id128_t m;
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int i, r;
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/* Do some superficial checks whether the kernel we are currently running is still around. If it isn't we
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* shouldn't offer hibernation as we couldn't possible resume from hibernation again. Of course, this check is
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* very superficial, as the kernel's mere existance is hardly enough to know whether the hibernate/resume cycle
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* will succeed. However, the common case of kernel updates can be caught this way, and it's definitely worth
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* covering that. */
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for (i = 0;; i++) {
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_cleanup_free_ char *path = NULL;
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switch (i) {
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case 0:
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/* First, let's look in /lib/modules/`uname -r`/vmlinuz. This is where current Fedora places
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* its RPM-managed kernels. It's a good place, as it means compiled vendor code is monopolized
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* in /usr, and then the kernel image is stored along with its modules in the same
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* hierarchy. It's also what our 'kernel-install' script is written for. */
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if (uname(&u) < 0)
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return log_debug_errno(errno, "Failed to acquire kernel release: %m");
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path = strjoin("/lib/modules/", u.release, "/vmlinuz");
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break;
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case 1:
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/* Secondly, let's look in /boot/vmlinuz-`uname -r`. This is where older Fedora and other
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* distributions tend to place the kernel. */
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path = strjoin("/boot/vmlinuz-", u.release);
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break;
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case 2:
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/* For the other cases, we look in the EFI/boot partition, at the place where our
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* "kernel-install" script copies the kernel on install by default. */
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r = sd_id128_get_machine(&m);
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if (r < 0)
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return log_debug_errno(r, "Failed to read machine ID: %m");
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(void) asprintf(&path, "/efi/" SD_ID128_FORMAT_STR "/%s/linux", SD_ID128_FORMAT_VAL(m), u.release);
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break;
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case 3:
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(void) asprintf(&path, "/boot/" SD_ID128_FORMAT_STR "/%s/linux", SD_ID128_FORMAT_VAL(m), u.release);
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break;
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case 4:
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(void) asprintf(&path, "/boot/efi/" SD_ID128_FORMAT_STR "/%s/linux", SD_ID128_FORMAT_VAL(m), u.release);
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break;
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default:
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return false;
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}
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if (!path)
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return -ENOMEM;
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log_debug("Testing whether %s exists.", path);
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if (access(path, F_OK) >= 0)
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return true;
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if (errno != ENOENT)
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log_debug_errno(errno, "Failed to determine whether '%s' exists, ignoring: %m", path);
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}
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}
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int read_fiemap(int fd, struct fiemap **ret) {
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_cleanup_free_ struct fiemap *fiemap = NULL, *result_fiemap = NULL;
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struct stat statinfo;
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uint32_t result_extents = 0;
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uint64_t fiemap_start = 0, fiemap_length;
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const size_t n_extra = DIV_ROUND_UP(sizeof(struct fiemap), sizeof(struct fiemap_extent));
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size_t fiemap_allocated = n_extra, result_fiemap_allocated = n_extra;
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if (fstat(fd, &statinfo) < 0)
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return log_debug_errno(errno, "Cannot determine file size: %m");
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if (!S_ISREG(statinfo.st_mode))
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return -ENOTTY;
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fiemap_length = statinfo.st_size;
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/* Zero this out in case we run on a file with no extents */
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fiemap = calloc(n_extra, sizeof(struct fiemap_extent));
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if (!fiemap)
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return -ENOMEM;
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result_fiemap = malloc_multiply(n_extra, sizeof(struct fiemap_extent));
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if (!result_fiemap)
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return -ENOMEM;
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/* XFS filesystem has incorrect implementation of fiemap ioctl and
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* returns extents for only one block-group at a time, so we need
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* to handle it manually, starting the next fiemap call from the end
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* of the last extent
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*/
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while (fiemap_start < fiemap_length) {
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*fiemap = (struct fiemap) {
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.fm_start = fiemap_start,
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.fm_length = fiemap_length,
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.fm_flags = FIEMAP_FLAG_SYNC,
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};
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/* Find out how many extents there are */
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if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
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return log_debug_errno(errno, "Failed to read extents: %m");
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/* Nothing to process */
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if (fiemap->fm_mapped_extents == 0)
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break;
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/* Resize fiemap to allow us to read in the extents, result fiemap has to hold all
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* the extents for the whole file. Add space for the initial struct fiemap. */
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if (!greedy_realloc0((void**) &fiemap, &fiemap_allocated,
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n_extra + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
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return -ENOMEM;
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fiemap->fm_extent_count = fiemap->fm_mapped_extents;
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fiemap->fm_mapped_extents = 0;
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if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
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return log_debug_errno(errno, "Failed to read extents: %m");
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/* Resize result_fiemap to allow us to copy in the extents */
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if (!greedy_realloc((void**) &result_fiemap, &result_fiemap_allocated,
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n_extra + result_extents + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
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return -ENOMEM;
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memcpy(result_fiemap->fm_extents + result_extents,
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fiemap->fm_extents,
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sizeof(struct fiemap_extent) * fiemap->fm_mapped_extents);
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result_extents += fiemap->fm_mapped_extents;
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/* Highly unlikely that it is zero */
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if (_likely_(fiemap->fm_mapped_extents > 0)) {
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uint32_t i = fiemap->fm_mapped_extents - 1;
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fiemap_start = fiemap->fm_extents[i].fe_logical +
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fiemap->fm_extents[i].fe_length;
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if (fiemap->fm_extents[i].fe_flags & FIEMAP_EXTENT_LAST)
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break;
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}
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}
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memcpy(result_fiemap, fiemap, sizeof(struct fiemap));
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result_fiemap->fm_mapped_extents = result_extents;
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*ret = TAKE_PTR(result_fiemap);
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return 0;
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}
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static bool can_s2h(void) {
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const char *p;
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int r;
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r = access("/sys/class/rtc/rtc0/wakealarm", W_OK);
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if (r < 0) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"/sys/class/rct/rct0/wakealarm is not writable %m");
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return false;
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}
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FOREACH_STRING(p, "suspend", "hibernate") {
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r = can_sleep(p);
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if (IN_SET(r, 0, -ENOSPC, -ENOMEDIUM)) {
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log_debug("Unable to %s system.", p);
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return false;
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}
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if (r < 0)
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return log_debug_errno(r, "Failed to check if %s is possible: %m", p);
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}
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return true;
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}
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int can_sleep(const char *verb) {
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_cleanup_strv_free_ char **modes = NULL, **states = NULL;
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int r;
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assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));
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if (streq(verb, "suspend-then-hibernate"))
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return can_s2h();
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r = parse_sleep_config(verb, &modes, &states, NULL);
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if (r < 0)
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return false;
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if (!can_sleep_state(states) || !can_sleep_disk(modes))
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return false;
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if (streq(verb, "suspend"))
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return true;
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if (kernel_exists() <= 0) {
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log_debug_errno(errno, "Couldn't find kernel, not offering hibernation.");
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return -ENOMEDIUM;
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}
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if (!enough_swap_for_hibernation())
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return -ENOSPC;
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return true;
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}
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