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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#if HAVE_XENCTRL
#define __XEN_INTERFACE_VERSION__ 0x00040900
#include <xen/xen.h>
#include <xen/kexec.h>
#include <xen/sys/privcmd.h>
#endif
#include "alloc-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "proc-cmdline.h"
#include "raw-reboot.h"
#include "reboot-util.h"
#include "string-util.h"
#include "umask-util.h"
#include "utf8.h"
#include "virt.h"
bool reboot_parameter_is_valid(const char *parameter) {
assert(parameter);
return ascii_is_valid(parameter) && strlen(parameter) <= NAME_MAX;
}
int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
int r;
if (isempty(parameter)) {
if (keep)
return 0;
if (unlink("/run/systemd/reboot-param") < 0) {
if (errno == ENOENT)
return 0;
return log_warning_errno(errno, "Failed to unlink reboot parameter file: %m");
}
return 0;
}
if (!reboot_parameter_is_valid(parameter))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid reboot parameter '%s'.", parameter);
WITH_UMASK(0022) {
r = write_string_file("/run/systemd/reboot-param", parameter,
WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
if (r < 0)
return log_warning_errno(r, "Failed to write reboot parameter file: %m");
}
return 0;
}
int read_reboot_parameter(char **parameter) {
int r;
assert(parameter);
r = read_one_line_file("/run/systemd/reboot-param", parameter);
if (r < 0 && r != -ENOENT)
return log_debug_errno(r, "Failed to read /run/systemd/reboot-param: %m");
return 0;
}
int reboot_with_parameter(RebootFlags flags) {
int r;
/* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if
* REBOOT_DRY_RUN was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is
* set and the reboot with parameter doesn't work out a fallback to classic reboot() is attempted. If
* REBOOT_FALLBACK is not set, 0 is returned instead, which should be considered indication for the
* caller to fall back to reboot() on its own, or somehow else deal with this. If REBOOT_LOG is
* specified will log about what it is going to do, as well as all errors. */
if (detect_container() == 0) {
_cleanup_free_ char *parameter = NULL;
r = read_one_line_file("/run/systemd/reboot-param", ¶meter);
if (r < 0 && r != -ENOENT)
log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, r,
"Failed to read reboot parameter file, ignoring: %m");
if (!isempty(parameter)) {
log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG,
"Rebooting with argument '%s'.", parameter);
if (flags & REBOOT_DRY_RUN)
return 0;
(void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter);
log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, errno,
"Failed to reboot with parameter, retrying without: %m");
}
}
if (!(flags & REBOOT_FALLBACK))
return 0;
log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, "Rebooting.");
if (flags & REBOOT_DRY_RUN)
return 0;
(void) reboot(RB_AUTOBOOT);
return log_full_errno(flags & REBOOT_LOG ? LOG_ERR : LOG_DEBUG, errno, "Failed to reboot: %m");
}
bool shall_restore_state(void) {
static int cached = -1;
bool b = true; /* If nothing specified or the check fails, then defaults to true. */
int r;
if (cached >= 0)
return cached;
r = proc_cmdline_get_bool("systemd.restore_state", PROC_CMDLINE_TRUE_WHEN_MISSING, &b);
if (r < 0)
log_debug_errno(r, "Failed to parse systemd.restore_state= kernel command line option, ignoring: %m");
return (cached = b);
}
static int xen_kexec_loaded(void) {
#if HAVE_XENCTRL
_cleanup_close_ int privcmd_fd = -EBADF, buf_fd = -EBADF;
xen_kexec_status_t *buffer;
size_t size;
int r;
if (access("/proc/xen", F_OK) < 0) {
if (errno == ENOENT)
return -EOPNOTSUPP;
return log_debug_errno(errno, "Unable to test whether /proc/xen exists: %m");
}
size = page_size();
if (sizeof(xen_kexec_status_t) > size)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "page_size is too small for hypercall");
privcmd_fd = open("/dev/xen/privcmd", O_RDWR|O_CLOEXEC);
if (privcmd_fd < 0)
return log_debug_errno(errno, "Cannot access /dev/xen/privcmd: %m");
buf_fd = open("/dev/xen/hypercall", O_RDWR|O_CLOEXEC);
if (buf_fd < 0)
return log_debug_errno(errno, "Cannot access /dev/xen/hypercall: %m");
buffer = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, buf_fd, 0);
if (buffer == MAP_FAILED)
return log_debug_errno(errno, "Cannot allocate buffer for hypercall: %m");
*buffer = (xen_kexec_status_t) {
.type = KEXEC_TYPE_DEFAULT,
};
privcmd_hypercall_t call = {
.op = __HYPERVISOR_kexec_op,
.arg = {
KEXEC_CMD_kexec_status,
PTR_TO_UINT64(buffer),
},
};
r = RET_NERRNO(ioctl(privcmd_fd, IOCTL_PRIVCMD_HYPERCALL, &call));
if (r < 0)
log_debug_errno(r, "kexec_status failed: %m");
munmap(buffer, size);
return r;
#else
return -EOPNOTSUPP;
#endif
}
bool kexec_loaded(void) {
_cleanup_free_ char *s = NULL;
int r;
r = xen_kexec_loaded();
if (r >= 0)
return r;
r = read_one_line_file("/sys/kernel/kexec_loaded", &s);
if (r < 0) {
if (r != -ENOENT)
log_debug_errno(r, "Unable to read /sys/kernel/kexec_loaded, ignoring: %m");
return false;
}
return s[0] == '1';
}
int create_shutdown_run_nologin_or_warn(void) {
int r;
/* This is used twice: once in systemd-user-sessions.service, in order to block logins when we
* actually go down, and once in systemd-logind.service when shutdowns are scheduled, and logins are
* to be turned off a bit in advance. We use the same wording of the message in both cases.
*
* Traditionally, there was only /etc/nologin, and we managed that. Then, in PAM 1.1
* support for /run/nologin was added as alternative
* (https://github.com/linux-pam/linux-pam/commit/e9e593f6ddeaf975b7fe8446d184e6bc387d450b).
* 13 years later we stopped managing /etc/nologin, leaving it for the administrator to manage.
*/
r = write_string_file("/run/nologin",
"System is going down. Unprivileged users are not permitted to log in anymore. "
"For technical details, see pam_nologin(8).",
WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_LABEL);
if (r < 0)
return log_error_errno(r, "Failed to create /run/nologin: %m");
return 0;
}
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