807 lines
25 KiB
C
807 lines
25 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "dirent-util.h"
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#include "efi-loader.h"
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#include "efivars.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "parse-util.h"
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#include "sort-util.h"
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#include "stat-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "utf8.h"
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#include "virt.h"
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#if 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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#define boot_option__contents \
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{ \
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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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}
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struct boot_option boot_option__contents;
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struct boot_option__packed boot_option__contents _packed_;
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assert_cc(offsetof(struct boot_option, title) == offsetof(struct boot_option__packed, title));
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/* sizeof(struct boot_option) != sizeof(struct boot_option__packed), so
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* the *size* of the structure should not be used anywhere below. */
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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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#define device_path__contents \
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{ \
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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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}
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struct device_path device_path__contents;
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struct device_path__packed device_path__contents _packed_;
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assert_cc(sizeof(struct device_path) == sizeof(struct device_path__packed));
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int efi_reboot_to_firmware_supported(void) {
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_cleanup_free_ void *v = NULL;
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static int cache = -1;
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uint64_t b;
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size_t s;
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int r;
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if (cache > 0)
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return 0;
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if (cache == 0)
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return -EOPNOTSUPP;
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if (!is_efi_boot())
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goto not_supported;
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r = efi_get_variable(EFI_VENDOR_GLOBAL, "OsIndicationsSupported", NULL, &v, &s);
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if (r == -ENOENT)
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goto not_supported; /* variable doesn't exist? it's not supported then */
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if (r < 0)
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return r;
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if (s != sizeof(uint64_t))
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return -EINVAL;
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b = *(uint64_t*) v;
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if (!(b & EFI_OS_INDICATIONS_BOOT_TO_FW_UI))
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goto not_supported; /* bit unset? it's not supported then */
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cache = 1;
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return 0;
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not_supported:
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cache = 0;
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return -EOPNOTSUPP;
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}
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static int get_os_indications(uint64_t *ret) {
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static struct stat cache_stat = {};
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_cleanup_free_ void *v = NULL;
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_cleanup_free_ char *fn = NULL;
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static uint64_t cache;
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struct stat new_stat;
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size_t s;
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int r;
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assert(ret);
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/* Let's verify general support first */
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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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fn = efi_variable_path(EFI_VENDOR_GLOBAL, "OsIndications");
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if (!fn)
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return -ENOMEM;
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/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
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if (stat(fn, &new_stat) < 0) {
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if (errno != ENOENT)
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return -errno;
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/* Doesn't exist? Then we can exit early (also see below) */
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*ret = 0;
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return 0;
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} else if (stat_inode_unmodified(&new_stat, &cache_stat)) {
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/* inode didn't change, we can return the cached value */
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*ret = cache;
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return 0;
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}
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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 OsIndications and report that with
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* OsIndicationsSupported will remove the OsIndications variable when it is unset. Let's
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* pretend it's 0 then, to hide this implementation detail. Note that this call will return
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* -ENOENT then only if the support for OsIndications is missing entirely, as determined by
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* efi_reboot_to_firmware_supported() above. */
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*ret = 0;
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return 0;
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}
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if (r < 0)
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return r;
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if (s != sizeof(uint64_t))
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return -EINVAL;
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cache_stat = new_stat;
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*ret = cache = *(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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b_new = UPDATE_FLAG(b, EFI_OS_INDICATIONS_BOOT_TO_FW_UI, value);
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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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static ssize_t utf16_size(const uint16_t *s, size_t buf_len_bytes) {
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size_t l = 0;
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/* Returns the size of the string in bytes without the terminating two zero bytes */
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if (buf_len_bytes % sizeof(uint16_t) != 0)
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return -EINVAL;
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while (l < buf_len_bytes / sizeof(uint16_t)) {
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if (s[l] == 0)
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return (l + 1) * sizeof(uint16_t);
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l++;
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}
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return -EINVAL; /* The terminator was not found */
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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 efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
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uint32_t u1;
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uint16_t u2, u3;
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const struct guid *uuid = guid;
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memcpy(&u1, &uuid->u1, sizeof(uint32_t));
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id128->bytes[0] = (u1 >> 24) & 0xff;
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id128->bytes[1] = (u1 >> 16) & 0xff;
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id128->bytes[2] = (u1 >> 8) & 0xff;
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id128->bytes[3] = u1 & 0xff;
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memcpy(&u2, &uuid->u2, sizeof(uint16_t));
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id128->bytes[4] = (u2 >> 8) & 0xff;
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id128->bytes[5] = u2 & 0xff;
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memcpy(&u3, &uuid->u3, sizeof(uint16_t));
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id128->bytes[6] = (u3 >> 8) & 0xff;
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id128->bytes[7] = 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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ssize_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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if (!is_efi_boot())
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return -EOPNOTSUPP;
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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 < offsetof(struct boot_option, title))
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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, l - offsetof(struct boot_option, title));
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if (title_size < 0)
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return title_size;
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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, doff;
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doff = offsetof(struct boot_option, title) + title_size;
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dbuf = buf + doff;
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if (header->path_len > l - doff)
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return -EINVAL;
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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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if (!p)
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return -ENOMEM;
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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 = TAKE_PTR(s);
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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 = TAKE_PTR(p);
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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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static void id128_to_efi_guid(sd_id128_t id, void *guid) {
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struct guid uuid = {
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.u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3],
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.u2 = id.bytes[4] << 8 | id.bytes[5],
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.u3 = id.bytes[6] << 8 | id.bytes[7],
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};
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memcpy(uuid.u4, id.bytes+8, sizeof(uuid.u4));
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memcpy(guid, &uuid, sizeof(uuid));
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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(
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uint16_t id,
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const char *title,
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uint32_t part,
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uint64_t pstart,
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uint64_t psize,
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sd_id128_t part_uuid,
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const char *path) {
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size_t size, title_len, path_len;
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_cleanup_free_ char *buf = NULL;
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struct boot_option *option;
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struct device_path *devicep;
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char boot_id[9];
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if (!is_efi_boot())
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return -EOPNOTSUPP;
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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 = malloc0(offsetof(struct boot_option, title) + title_len +
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sizeof(struct drive_path) +
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sizeof(struct device_path) + path_len);
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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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memcpy(&devicep->drive.part_nr, &part, sizeof(uint32_t));
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memcpy(&devicep->drive.part_start, &pstart, sizeof(uint64_t));
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memcpy(&devicep->drive.part_size, &psize, sizeof(uint64_t));
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id128_to_efi_guid(part_uuid, devicep->drive.signature);
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devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER;
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devicep->drive.signature_type = SIGNATURE_TYPE_GUID;
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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;
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devicep->sub_type = END_ENTIRE_DEVICE_PATH_SUBTYPE;
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devicep->length = offsetof(struct device_path, path);
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size += devicep->length;
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xsprintf(boot_id, "Boot%04X", id);
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return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size);
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}
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int efi_remove_boot_option(uint16_t id) {
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char boot_id[9];
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if (!is_efi_boot())
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return -EOPNOTSUPP;
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xsprintf(boot_id, "Boot%04X", id);
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return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0);
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}
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int efi_get_boot_order(uint16_t **order) {
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_cleanup_free_ void *buf = NULL;
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size_t l;
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int r;
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if (!is_efi_boot())
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return -EOPNOTSUPP;
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r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
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if (r < 0)
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return r;
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if (l <= 0)
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return -ENOENT;
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if (l % sizeof(uint16_t) > 0 ||
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l / sizeof(uint16_t) > INT_MAX)
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return -EINVAL;
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*order = TAKE_PTR(buf);
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return (int) (l / sizeof(uint16_t));
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}
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int efi_set_boot_order(uint16_t *order, size_t n) {
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if (!is_efi_boot())
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return -EOPNOTSUPP;
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return efi_set_variable(EFI_VENDOR_GLOBAL, "BootOrder", order, n * sizeof(uint16_t));
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}
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static int boot_id_hex(const char s[static 4]) {
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int id = 0, i;
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assert(s);
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for (i = 0; i < 4; i++)
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if (s[i] >= '0' && s[i] <= '9')
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id |= (s[i] - '0') << (3 - i) * 4;
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else if (s[i] >= 'A' && s[i] <= 'F')
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id |= (s[i] - 'A' + 10) << (3 - i) * 4;
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else
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return -EINVAL;
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return id;
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}
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static int cmp_uint16(const uint16_t *a, const uint16_t *b) {
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return CMP(*a, *b);
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}
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int efi_get_boot_options(uint16_t **options) {
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_cleanup_closedir_ DIR *dir = NULL;
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_cleanup_free_ uint16_t *list = NULL;
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struct dirent *de;
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size_t alloc = 0;
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int count = 0;
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assert(options);
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if (!is_efi_boot())
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return -EOPNOTSUPP;
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dir = opendir("/sys/firmware/efi/efivars/");
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if (!dir)
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return -errno;
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FOREACH_DIRENT(de, dir, return -errno) {
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int id;
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|
||
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;
|
||
}
|
||
|
||
typesafe_qsort(list, count, cmp_uint16);
|
||
|
||
*options = TAKE_PTR(list);
|
||
|
||
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);
|
||
|
||
if (!is_efi_boot())
|
||
return -EOPNOTSUPP;
|
||
|
||
r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x);
|
||
if (r < 0)
|
||
return log_debug_errno(r, "Failed to read LoaderTimeInitUSec: %m");
|
||
|
||
r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y);
|
||
if (r < 0)
|
||
return log_debug_errno(r, "Failed to read LoaderTimeExecUSec: %m");
|
||
|
||
if (y == 0 || y < x || y - x > USEC_PER_HOUR)
|
||
return log_debug_errno(SYNTHETIC_ERRNO(EIO),
|
||
"Bad LoaderTimeInitUSec=%"PRIu64", LoaderTimeExecUSec=%" PRIu64"; refusing.",
|
||
x, y);
|
||
|
||
*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];
|
||
|
||
if (!is_efi_boot())
|
||
return -EOPNOTSUPP;
|
||
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (sscanf(p, SD_ID128_UUID_FORMAT_STR,
|
||
&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;
|
||
}
|
||
|
||
int efi_loader_get_entries(char ***ret) {
|
||
_cleanup_free_ char16_t *entries = NULL;
|
||
_cleanup_strv_free_ char **l = NULL;
|
||
size_t size, i, start;
|
||
int r;
|
||
|
||
assert(ret);
|
||
|
||
if (!is_efi_boot())
|
||
return -EOPNOTSUPP;
|
||
|
||
r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderEntries", NULL, (void**) &entries, &size);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
/* The variable contains a series of individually NUL terminated UTF-16 strings. */
|
||
|
||
for (i = 0, start = 0;; i++) {
|
||
_cleanup_free_ char *decoded = NULL;
|
||
bool end;
|
||
|
||
/* Is this the end of the variable's data? */
|
||
end = i * sizeof(char16_t) >= size;
|
||
|
||
/* Are we in the middle of a string? (i.e. not at the end of the variable, nor at a NUL terminator?) If
|
||
* so, let's go to the next entry. */
|
||
if (!end && entries[i] != 0)
|
||
continue;
|
||
|
||
/* We reached the end of a string, let's decode it into UTF-8 */
|
||
decoded = utf16_to_utf8(entries + start, (i - start) * sizeof(char16_t));
|
||
if (!decoded)
|
||
return -ENOMEM;
|
||
|
||
if (efi_loader_entry_name_valid(decoded)) {
|
||
r = strv_consume(&l, TAKE_PTR(decoded));
|
||
if (r < 0)
|
||
return r;
|
||
} else
|
||
log_debug("Ignoring invalid loader entry '%s'.", decoded);
|
||
|
||
/* We reached the end of the variable */
|
||
if (end)
|
||
break;
|
||
|
||
/* Continue after the NUL byte */
|
||
start = i + 1;
|
||
}
|
||
|
||
*ret = TAKE_PTR(l);
|
||
return 0;
|
||
}
|
||
|
||
int efi_loader_get_features(uint64_t *ret) {
|
||
_cleanup_free_ void *v = NULL;
|
||
size_t s;
|
||
int r;
|
||
|
||
if (!is_efi_boot()) {
|
||
*ret = 0;
|
||
return 0;
|
||
}
|
||
|
||
r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderFeatures", NULL, &v, &s);
|
||
if (r == -ENOENT) {
|
||
_cleanup_free_ char *info = NULL;
|
||
|
||
/* The new (v240+) LoaderFeatures variable is not supported, let's see if it's systemd-boot at all */
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderInfo", &info);
|
||
if (r < 0) {
|
||
if (r != -ENOENT)
|
||
return r;
|
||
|
||
/* Variable not set, definitely means not systemd-boot */
|
||
|
||
} else if (first_word(info, "systemd-boot")) {
|
||
|
||
/* An older systemd-boot version. Let's hardcode the feature set, since it was pretty
|
||
* static in all its versions. */
|
||
|
||
*ret = EFI_LOADER_FEATURE_CONFIG_TIMEOUT |
|
||
EFI_LOADER_FEATURE_ENTRY_DEFAULT |
|
||
EFI_LOADER_FEATURE_ENTRY_ONESHOT;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* No features supported */
|
||
*ret = 0;
|
||
return 0;
|
||
}
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (s != sizeof(uint64_t))
|
||
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
|
||
"LoaderFeatures EFI variable doesn't have the right size.");
|
||
|
||
memcpy(ret, v, sizeof(uint64_t));
|
||
return 0;
|
||
}
|
||
|
||
int efi_loader_get_config_timeout_one_shot(usec_t *ret) {
|
||
_cleanup_free_ char *v = NULL, *fn = NULL;
|
||
static struct stat cache_stat = {};
|
||
struct stat new_stat;
|
||
static usec_t cache;
|
||
uint64_t sec;
|
||
int r;
|
||
|
||
assert(ret);
|
||
|
||
fn = efi_variable_path(EFI_VENDOR_LOADER, "LoaderConfigTimeoutOneShot");
|
||
if (!fn)
|
||
return -ENOMEM;
|
||
|
||
/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
|
||
if (stat(fn, &new_stat) < 0)
|
||
return -errno;
|
||
|
||
if (stat_inode_unmodified(&new_stat, &cache_stat)) {
|
||
*ret = cache;
|
||
return 0;
|
||
}
|
||
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderConfigTimeoutOneShot", &v);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = safe_atou64(v, &sec);
|
||
if (r < 0)
|
||
return r;
|
||
if (sec > USEC_INFINITY / USEC_PER_SEC)
|
||
return -ERANGE;
|
||
|
||
cache_stat = new_stat;
|
||
*ret = cache = sec * USEC_PER_SEC; /* return in µs */
|
||
return 0;
|
||
}
|
||
|
||
int efi_loader_update_entry_one_shot_cache(char **cache, struct stat *cache_stat) {
|
||
_cleanup_free_ char *fn = NULL, *v = NULL;
|
||
struct stat new_stat;
|
||
int r;
|
||
|
||
assert(cache);
|
||
assert(cache_stat);
|
||
|
||
fn = efi_variable_path(EFI_VENDOR_LOADER, "LoaderEntryOneShot");
|
||
if (!fn)
|
||
return -ENOMEM;
|
||
|
||
/* stat() the EFI variable, to see if the mtime changed. If it did we need to cache again. */
|
||
if (stat(fn, &new_stat) < 0)
|
||
return -errno;
|
||
|
||
if (stat_inode_unmodified(&new_stat, cache_stat))
|
||
return 0;
|
||
|
||
r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryOneShot", &v);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (!efi_loader_entry_name_valid(v))
|
||
return -EINVAL;
|
||
|
||
*cache_stat = new_stat;
|
||
free_and_replace(*cache, v);
|
||
|
||
return 0;
|
||
}
|
||
|
||
#endif
|
||
|
||
bool efi_loader_entry_name_valid(const char *s) {
|
||
if (isempty(s))
|
||
return false;
|
||
|
||
if (strlen(s) > FILENAME_MAX) /* Make sure entry names fit in filenames */
|
||
return false;
|
||
|
||
return in_charset(s, ALPHANUMERICAL "+-_.");
|
||
}
|
||
|
||
char *efi_tilt_backslashes(char *s) {
|
||
char *p;
|
||
|
||
for (p = s; *p; p++)
|
||
if (*p == '\\')
|
||
*p = '/';
|
||
|
||
return s;
|
||
}
|