mirror of
https://github.com/systemd/systemd.git
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702 lines
20 KiB
C
702 lines
20 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 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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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include "util.h"
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#include "utf8.h"
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#include "virt.h"
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#include "efivars.h"
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#ifdef ENABLE_EFI
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#define LOAD_OPTION_ACTIVE 0x00000001
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#define MEDIA_DEVICE_PATH 0x04
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#define MEDIA_HARDDRIVE_DP 0x01
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#define MEDIA_FILEPATH_DP 0x04
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#define SIGNATURE_TYPE_GUID 0x02
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#define MBR_TYPE_EFI_PARTITION_TABLE_HEADER 0x02
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#define END_DEVICE_PATH_TYPE 0x7f
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#define END_ENTIRE_DEVICE_PATH_SUBTYPE 0xff
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#define EFI_OS_INDICATIONS_BOOT_TO_FW_UI 0x0000000000000001
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struct boot_option {
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uint32_t attr;
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uint16_t path_len;
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uint16_t title[];
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} _packed_;
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struct drive_path {
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uint32_t part_nr;
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uint64_t part_start;
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uint64_t part_size;
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char signature[16];
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uint8_t mbr_type;
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uint8_t signature_type;
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} _packed_;
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struct device_path {
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uint8_t type;
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uint8_t sub_type;
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uint16_t length;
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union {
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uint16_t path[0];
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struct drive_path drive;
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};
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} _packed_;
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bool is_efi_boot(void) {
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return access("/sys/firmware/efi", F_OK) >= 0;
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}
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static int read_flag(const char *varname) {
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int r;
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_cleanup_free_ void *v = NULL;
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size_t s;
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uint8_t b;
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r = efi_get_variable(EFI_VENDOR_GLOBAL, varname, NULL, &v, &s);
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if (r < 0)
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return r;
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if (s != 1)
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return -EINVAL;
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b = *(uint8_t *)v;
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r = b > 0;
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return r;
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}
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bool is_efi_secure_boot(void) {
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return read_flag("SecureBoot") > 0;
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}
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bool is_efi_secure_boot_setup_mode(void) {
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return read_flag("SetupMode") > 0;
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}
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int efi_reboot_to_firmware_supported(void) {
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int r;
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size_t s;
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uint64_t b;
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_cleanup_free_ void *v = NULL;
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if (!is_efi_boot() || detect_container(NULL) > 0)
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return -EOPNOTSUPP;
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r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s);
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if (r < 0)
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return r;
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else if (s != sizeof(uint64_t))
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return -EINVAL;
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b = *(uint64_t *)v;
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b &= EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
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return b > 0 ? 0 : -EOPNOTSUPP;
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}
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static int get_os_indications(uint64_t *os_indication) {
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int r;
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size_t s;
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_cleanup_free_ void *v = NULL;
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r = efi_reboot_to_firmware_supported();
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if (r < 0)
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return r;
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r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndications", NULL, &v, &s);
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if (r == -ENOENT) {
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/* Some firmware implementations that do support
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* OsIndications and report that with
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* OsIndicationsSupported will remove the
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* OsIndications variable when it is unset. Let's
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* pretend it's 0 then, to hide this implementation
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* detail. Note that this call will return -ENOENT
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* then only if the support for OsIndications is
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* missing entirely, as determined by
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* efi_reboot_to_firmware_supported() above. */
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*os_indication = 0;
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return 0;
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} else if (r < 0)
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return r;
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else if (s != sizeof(uint64_t))
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return -EINVAL;
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*os_indication = *(uint64_t *)v;
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return 0;
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}
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int efi_get_reboot_to_firmware(void) {
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int r;
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uint64_t b;
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r = get_os_indications(&b);
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if (r < 0)
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return r;
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return !!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI);
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}
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int efi_set_reboot_to_firmware(bool value) {
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int r;
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uint64_t b, b_new;
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r = get_os_indications(&b);
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if (r < 0)
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return r;
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if (value)
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b_new = b | EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
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else
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b_new = b & ~EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
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/* Avoid writing to efi vars store if we can due to firmware bugs. */
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if (b != b_new)
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return efi_set_variable(EFI_VENDOR_GLOBAL, "OsIndications", &b_new, sizeof(uint64_t));
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return 0;
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}
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int efi_get_variable(
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sd_id128_t vendor,
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const char *name,
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uint32_t *attribute,
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void **value,
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size_t *size) {
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_cleanup_close_ int fd = -1;
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_cleanup_free_ char *p = NULL;
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uint32_t a;
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ssize_t n;
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struct stat st;
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_cleanup_free_ void *buf = NULL;
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assert(name);
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assert(value);
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assert(size);
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if (asprintf(&p,
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"/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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name, SD_ID128_FORMAT_VAL(vendor)) < 0)
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return -ENOMEM;
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fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (fstat(fd, &st) < 0)
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return -errno;
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if (st.st_size < 4)
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return -EIO;
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if (st.st_size > 4*1024*1024 + 4)
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return -E2BIG;
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n = read(fd, &a, sizeof(a));
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if (n < 0)
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return -errno;
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if (n != sizeof(a))
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return -EIO;
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buf = malloc(st.st_size - 4 + 2);
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if (!buf)
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return -ENOMEM;
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n = read(fd, buf, (size_t) st.st_size - 4);
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if (n < 0)
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return -errno;
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if (n != (ssize_t) st.st_size - 4)
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return -EIO;
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/* Always NUL terminate (2 bytes, to protect UTF-16) */
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((char*) buf)[st.st_size - 4] = 0;
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((char*) buf)[st.st_size - 4 + 1] = 0;
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*value = buf;
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buf = NULL;
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*size = (size_t) st.st_size - 4;
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if (attribute)
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*attribute = a;
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return 0;
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}
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int efi_set_variable(
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sd_id128_t vendor,
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const char *name,
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const void *value,
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size_t size) {
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struct var {
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uint32_t attr;
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char buf[];
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} _packed_ * _cleanup_free_ buf = NULL;
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_cleanup_free_ char *p = NULL;
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_cleanup_close_ int fd = -1;
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assert(name);
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if (asprintf(&p,
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"/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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name, SD_ID128_FORMAT_VAL(vendor)) < 0)
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return -ENOMEM;
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if (size == 0) {
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if (unlink(p) < 0)
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return -errno;
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return 0;
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}
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fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644);
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if (fd < 0)
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return -errno;
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buf = malloc(sizeof(uint32_t) + size);
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if (!buf)
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return -ENOMEM;
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buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS;
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memcpy(buf->buf, value, size);
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return loop_write(fd, buf, sizeof(uint32_t) + size, false);
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}
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int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) {
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_cleanup_free_ void *s = NULL;
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size_t ss = 0;
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int r;
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char *x;
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r = efi_get_variable(vendor, name, NULL, &s, &ss);
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if (r < 0)
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return r;
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x = utf16_to_utf8(s, ss);
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if (!x)
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return -ENOMEM;
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*p = x;
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return 0;
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}
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static size_t utf16_size(const uint16_t *s) {
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size_t l = 0;
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while (s[l] > 0)
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l++;
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return (l+1) * sizeof(uint16_t);
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}
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static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
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struct uuid {
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uint32_t u1;
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uint16_t u2;
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uint16_t u3;
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uint8_t u4[8];
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} _packed_;
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const struct uuid *uuid = guid;
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id128->bytes[0] = (uuid->u1 >> 24) & 0xff;
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id128->bytes[1] = (uuid->u1 >> 16) & 0xff;
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id128->bytes[2] = (uuid->u1 >> 8) & 0xff;
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id128->bytes[3] = (uuid->u1) & 0xff;
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id128->bytes[4] = (uuid->u2 >> 8) & 0xff;
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id128->bytes[5] = (uuid->u2) & 0xff;
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id128->bytes[6] = (uuid->u3 >> 8) & 0xff;
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id128->bytes[7] = (uuid->u3) & 0xff;
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memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4));
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}
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int efi_get_boot_option(
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uint16_t id,
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char **title,
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sd_id128_t *part_uuid,
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char **path,
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bool *active) {
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char boot_id[9];
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_cleanup_free_ uint8_t *buf = NULL;
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size_t l;
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struct boot_option *header;
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size_t title_size;
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_cleanup_free_ char *s = NULL, *p = NULL;
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sd_id128_t p_uuid = SD_ID128_NULL;
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int r;
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xsprintf(boot_id, "Boot%04X", id);
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r = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l);
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if (r < 0)
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return r;
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if (l < sizeof(struct boot_option))
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return -ENOENT;
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header = (struct boot_option *)buf;
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title_size = utf16_size(header->title);
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if (title_size > l - offsetof(struct boot_option, title))
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return -EINVAL;
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if (title) {
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s = utf16_to_utf8(header->title, title_size);
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if (!s)
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return -ENOMEM;
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}
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if (header->path_len > 0) {
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uint8_t *dbuf;
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size_t dnext;
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dbuf = buf + offsetof(struct boot_option, title) + title_size;
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dnext = 0;
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while (dnext < header->path_len) {
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struct device_path *dpath;
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dpath = (struct device_path *)(dbuf + dnext);
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if (dpath->length < 4)
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break;
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/* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */
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if (dpath->type == END_DEVICE_PATH_TYPE && dpath->sub_type == END_ENTIRE_DEVICE_PATH_SUBTYPE)
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break;
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dnext += dpath->length;
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/* Type 0x04 – Media Device Path */
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if (dpath->type != MEDIA_DEVICE_PATH)
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continue;
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/* Sub-Type 1 – Hard Drive */
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if (dpath->sub_type == MEDIA_HARDDRIVE_DP) {
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/* 0x02 – GUID Partition Table */
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if (dpath->drive.mbr_type != MBR_TYPE_EFI_PARTITION_TABLE_HEADER)
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continue;
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/* 0x02 – GUID signature */
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if (dpath->drive.signature_type != SIGNATURE_TYPE_GUID)
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continue;
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if (part_uuid)
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efi_guid_to_id128(dpath->drive.signature, &p_uuid);
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continue;
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}
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/* Sub-Type 4 – File Path */
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if (dpath->sub_type == MEDIA_FILEPATH_DP && !p && path) {
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p = utf16_to_utf8(dpath->path, dpath->length-4);
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efi_tilt_backslashes(p);
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continue;
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}
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}
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}
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if (title) {
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*title = s;
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s = NULL;
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}
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if (part_uuid)
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*part_uuid = p_uuid;
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if (path) {
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*path = p;
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p = NULL;
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}
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if (active)
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*active = !!(header->attr & LOAD_OPTION_ACTIVE);
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return 0;
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}
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static void to_utf16(uint16_t *dest, const char *src) {
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int i;
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for (i = 0; src[i] != '\0'; i++)
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dest[i] = src[i];
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dest[i] = '\0';
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}
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struct guid {
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uint32_t u1;
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uint16_t u2;
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uint16_t u3;
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uint8_t u4[8];
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} _packed_;
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static void id128_to_efi_guid(sd_id128_t id, void *guid) {
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struct guid *uuid = guid;
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uuid->u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3];
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uuid->u2 = id.bytes[4] << 8 | id.bytes[5];
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uuid->u3 = id.bytes[6] << 8 | id.bytes[7];
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memcpy(uuid->u4, id.bytes+8, sizeof(uuid->u4));
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}
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static uint16_t *tilt_slashes(uint16_t *s) {
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uint16_t *p;
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for (p = s; *p; p++)
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if (*p == '/')
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*p = '\\';
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return s;
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}
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int efi_add_boot_option(uint16_t id, const char *title,
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uint32_t part, uint64_t pstart, uint64_t psize,
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sd_id128_t part_uuid, const char *path) {
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char boot_id[9];
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size_t size;
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size_t title_len;
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size_t path_len;
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struct boot_option *option;
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struct device_path *devicep;
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_cleanup_free_ char *buf = NULL;
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title_len = (strlen(title)+1) * 2;
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path_len = (strlen(path)+1) * 2;
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buf = calloc(sizeof(struct boot_option) + title_len +
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sizeof(struct drive_path) +
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sizeof(struct device_path) + path_len, 1);
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if (!buf)
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return -ENOMEM;
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/* header */
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option = (struct boot_option *)buf;
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option->attr = LOAD_OPTION_ACTIVE;
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option->path_len = offsetof(struct device_path, drive) + sizeof(struct drive_path) +
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offsetof(struct device_path, path) + path_len +
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offsetof(struct device_path, path);
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to_utf16(option->title, title);
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size = offsetof(struct boot_option, title) + title_len;
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/* partition info */
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devicep = (struct device_path *)(buf + size);
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devicep->type = MEDIA_DEVICE_PATH;
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devicep->sub_type = MEDIA_HARDDRIVE_DP;
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devicep->length = offsetof(struct device_path, drive) + sizeof(struct drive_path);
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devicep->drive.part_nr = part;
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devicep->drive.part_start = pstart;
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devicep->drive.part_size = psize;
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devicep->drive.signature_type = SIGNATURE_TYPE_GUID;
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devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER;
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id128_to_efi_guid(part_uuid, devicep->drive.signature);
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size += devicep->length;
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/* path to loader */
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devicep = (struct device_path *)(buf + size);
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devicep->type = MEDIA_DEVICE_PATH;
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devicep->sub_type = MEDIA_FILEPATH_DP;
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devicep->length = offsetof(struct device_path, path) + path_len;
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to_utf16(devicep->path, path);
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tilt_slashes(devicep->path);
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size += devicep->length;
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/* end of path */
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devicep = (struct device_path *)(buf + size);
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devicep->type = END_DEVICE_PATH_TYPE;
|
||
devicep->sub_type = END_ENTIRE_DEVICE_PATH_SUBTYPE;
|
||
devicep->length = offsetof(struct device_path, path);
|
||
size += devicep->length;
|
||
|
||
xsprintf(boot_id, "Boot%04X", id);
|
||
return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size);
|
||
}
|
||
|
||
int efi_remove_boot_option(uint16_t id) {
|
||
char boot_id[9];
|
||
|
||
xsprintf(boot_id, "Boot%04X", id);
|
||
return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0);
|
||
}
|
||
|
||
int efi_get_boot_order(uint16_t **order) {
|
||
_cleanup_free_ void *buf = NULL;
|
||
size_t l;
|
||
int r;
|
||
|
||
r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (l <= 0)
|
||
return -ENOENT;
|
||
|
||
if (l % sizeof(uint16_t) > 0 ||
|
||
l / sizeof(uint16_t) > INT_MAX)
|
||
return -EINVAL;
|
||
|
||
*order = buf;
|
||
buf = NULL;
|
||
return (int) (l / sizeof(uint16_t));
|
||
}
|
||
|
||
int efi_set_boot_order(uint16_t *order, size_t n) {
|
||
return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t));
|
||
}
|
||
|
||
static int boot_id_hex(const char s[4]) {
|
||
int i;
|
||
int id = 0;
|
||
|
||
for (i = 0; i < 4; i++)
|
||
if (s[i] >= '0' && s[i] <= '9')
|
||
id |= (s[i] - '0') << (3 - i) * 4;
|
||
else if (s[i] >= 'A' && s[i] <= 'F')
|
||
id |= (s[i] - 'A' + 10) << (3 - i) * 4;
|
||
else
|
||
return -EINVAL;
|
||
|
||
return id;
|
||
}
|
||
|
||
static int cmp_uint16(const void *_a, const void *_b) {
|
||
const uint16_t *a = _a, *b = _b;
|
||
|
||
return (int)*a - (int)*b;
|
||
}
|
||
|
||
int efi_get_boot_options(uint16_t **options) {
|
||
_cleanup_closedir_ DIR *dir = NULL;
|
||
struct dirent *de;
|
||
_cleanup_free_ uint16_t *list = NULL;
|
||
size_t alloc = 0;
|
||
int count = 0;
|
||
|
||
assert(options);
|
||
|
||
dir = opendir("/sys/firmware/efi/efivars/");
|
||
if (!dir)
|
||
return -errno;
|
||
|
||
FOREACH_DIRENT(de, dir, return -errno) {
|
||
int id;
|
||
|
||
if (strncmp(de->d_name, "Boot", 4) != 0)
|
||
continue;
|
||
|
||
if (strlen(de->d_name) != 45)
|
||
continue;
|
||
|
||
if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0)
|
||
continue;
|
||
|
||
id = boot_id_hex(de->d_name + 4);
|
||
if (id < 0)
|
||
continue;
|
||
|
||
if (!GREEDY_REALLOC(list, alloc, count + 1))
|
||
return -ENOMEM;
|
||
|
||
list[count++] = id;
|
||
}
|
||
|
||
qsort_safe(list, count, sizeof(uint16_t), cmp_uint16);
|
||
|
||
*options = list;
|
||
list = NULL;
|
||
return count;
|
||
}
|
||
|
||
static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
|
||
_cleanup_free_ char *j = NULL;
|
||
int r;
|
||
uint64_t x = 0;
|
||
|
||
assert(name);
|
||
assert(u);
|
||
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = safe_atou64(j, &x);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
*u = x;
|
||
return 0;
|
||
}
|
||
|
||
int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) {
|
||
uint64_t x, y;
|
||
int r;
|
||
|
||
assert(firmware);
|
||
assert(loader);
|
||
|
||
r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (y == 0 || y < x)
|
||
return -EIO;
|
||
|
||
if (y > USEC_PER_HOUR)
|
||
return -EIO;
|
||
|
||
*firmware = x;
|
||
*loader = y;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int efi_loader_get_device_part_uuid(sd_id128_t *u) {
|
||
_cleanup_free_ char *p = NULL;
|
||
int r, parsed[16];
|
||
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
|
||
&parsed[0], &parsed[1], &parsed[2], &parsed[3],
|
||
&parsed[4], &parsed[5], &parsed[6], &parsed[7],
|
||
&parsed[8], &parsed[9], &parsed[10], &parsed[11],
|
||
&parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16)
|
||
return -EIO;
|
||
|
||
if (u) {
|
||
unsigned i;
|
||
|
||
for (i = 0; i < ELEMENTSOF(parsed); i++)
|
||
u->bytes[i] = parsed[i];
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
#endif
|
||
|
||
char *efi_tilt_backslashes(char *s) {
|
||
char *p;
|
||
|
||
for (p = s; *p; p++)
|
||
if (*p == '\\')
|
||
*p = '/';
|
||
|
||
return s;
|
||
}
|