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https://github.com/systemd/systemd
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bootctl: add kernel-identity command
The command takes a kernel as argument and checks what kind of kernel the image is. Returns one of uki, pe or unknown.
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@ -217,6 +217,19 @@
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</variablelist>
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</refsect1>
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<refsect1>
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<title><command>kernel</command> Commands</title>
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<variablelist>
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<varlistentry>
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<term><option>kernel-identify</option> <replaceable>kernel</replaceable></term>
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<listitem><para>Takes a kernel image as argument. Checks what kind of kernel the image is. Returns
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one of uki, pe or unknown.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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@ -2622,6 +2622,8 @@ if conf.get('HAVE_BLKID') == 1 and conf.get('HAVE_GNU_EFI') == 1
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'src/boot/bootctl-status.h',
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'src/boot/bootctl-systemd-efi-options.c',
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'src/boot/bootctl-systemd-efi-options.h',
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'src/boot/bootctl-uki.c',
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'src/boot/bootctl-uki.h',
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'src/boot/bootctl-util.c',
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'src/boot/bootctl-util.h'],
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include_directories : includes,
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110
src/boot/bootctl-uki.c
Normal file
110
src/boot/bootctl-uki.c
Normal file
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@ -0,0 +1,110 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "bootctl.h"
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#include "bootctl-uki.h"
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#include "fd-util.h"
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#include "parse-util.h"
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#include "pe-header.h"
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#define MAX_SECTIONS 96
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static const uint8_t dos_file_magic[2] = "MZ";
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static const uint8_t pe_file_magic[4] = "PE\0\0";
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static const uint8_t name_osrel[8] = ".osrel";
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static const uint8_t name_linux[8] = ".linux";
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static const uint8_t name_initrd[8] = ".initrd";
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static int pe_sections(FILE *uki, struct PeSectionHeader **ret, size_t *ret_n) {
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_cleanup_free_ struct PeSectionHeader *sections = NULL;
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struct DosFileHeader dos;
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struct PeHeader pe;
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size_t scount;
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uint64_t soff, items;
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int rc;
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items = fread(&dos, 1, sizeof(dos), uki);
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if (items != sizeof(dos))
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return log_error_errno(SYNTHETIC_ERRNO(EIO), "DOS header read error");
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if (memcmp(dos.Magic, dos_file_magic, sizeof(dos_file_magic)) != 0)
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goto no_sections;
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rc = fseek(uki, le32toh(dos.ExeHeader), SEEK_SET);
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if (rc < 0)
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return log_error_errno(errno, "seek to PE header");
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items = fread(&pe, 1, sizeof(pe), uki);
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if (items != sizeof(pe))
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return log_error_errno(SYNTHETIC_ERRNO(EIO), "PE header read error");
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if (memcmp(pe.Magic, pe_file_magic, sizeof(pe_file_magic)) != 0)
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goto no_sections;
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soff = le32toh(dos.ExeHeader) + sizeof(pe) + le16toh(pe.FileHeader.SizeOfOptionalHeader);
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rc = fseek(uki, soff, SEEK_SET);
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if (rc < 0)
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return log_error_errno(errno, "seek to PE section headers");
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scount = le16toh(pe.FileHeader.NumberOfSections);
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if (scount > MAX_SECTIONS)
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goto no_sections;
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sections = new(struct PeSectionHeader, scount);
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if (!sections)
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return log_oom();
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items = fread(sections, sizeof(*sections), scount, uki);
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if (items != scount)
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return log_error_errno(SYNTHETIC_ERRNO(EIO), "PE section header read error");
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*ret = TAKE_PTR(sections);
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*ret_n = scount;
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return 0;
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no_sections:
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*ret = NULL;
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*ret_n = 0;
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return 0;
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}
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static int find_pe_section(struct PeSectionHeader *sections, size_t scount,
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const uint8_t *name, size_t namelen, size_t *ret) {
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for (size_t s = 0; s < scount; s++) {
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if (memcmp_nn(sections[s].Name, sizeof(sections[s].Name),
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name, namelen) == 0) {
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if (ret)
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*ret = s;
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return 1;
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}
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}
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return 0;
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}
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static bool is_uki(struct PeSectionHeader *sections, size_t scount) {
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return (find_pe_section(sections, scount, name_osrel, sizeof(name_osrel), NULL) &&
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find_pe_section(sections, scount, name_linux, sizeof(name_linux), NULL) &&
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find_pe_section(sections, scount, name_initrd, sizeof(name_initrd), NULL));
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}
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int verb_kernel_identify(int argc, char *argv[], void *userdata) {
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_cleanup_fclose_ FILE *uki = NULL;
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_cleanup_free_ struct PeSectionHeader *sections = NULL;
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size_t scount;
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int rc;
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uki = fopen(argv[1], "re");
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if (!uki)
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return log_error_errno(errno, "Failed to open UKI file '%s': %m", argv[1]);
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rc = pe_sections(uki, §ions, &scount);
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if (rc < 0)
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return EXIT_FAILURE;
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if (sections) {
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if (is_uki(sections, scount)) {
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puts("uki");
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return EXIT_SUCCESS;
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}
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puts("pe");
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return EXIT_SUCCESS;
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}
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puts("unknown");
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return EXIT_SUCCESS;
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}
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3
src/boot/bootctl-uki.h
Normal file
3
src/boot/bootctl-uki.h
Normal file
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@ -0,0 +1,3 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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int verb_kernel_identify(int argc, char *argv[], void *userdata);
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@ -9,6 +9,7 @@
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#include "bootctl-set-efivar.h"
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#include "bootctl-status.h"
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#include "bootctl-systemd-efi-options.h"
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#include "bootctl-uki.h"
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#include "build.h"
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#include "dissect-image.h"
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#include "escape.h"
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@ -150,6 +151,8 @@ static int help(int argc, char *argv[], void *userdata) {
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" remove Remove systemd-boot from the ESP and EFI variables\n"
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" is-installed Test whether systemd-boot is installed in the ESP\n"
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" random-seed Initialize random seed in ESP and EFI variables\n"
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"\n%3$skernel Commands:%4$s\n"
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" kernel-identify Identify kernel image type.\n"
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"\n%3$sOptions:%4$s\n"
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" -h --help Show this help\n"
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" --version Print version\n"
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@ -406,6 +409,7 @@ static int bootctl_main(int argc, char *argv[]) {
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{ "update", VERB_ANY, 1, 0, verb_install },
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{ "remove", VERB_ANY, 1, 0, verb_remove },
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{ "is-installed", VERB_ANY, 1, 0, verb_is_installed },
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{ "kernel-identify", 2, 2, 0, verb_kernel_identify },
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{ "list", VERB_ANY, 1, 0, verb_list },
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{ "set-default", 2, 2, 0, verb_set_efivar },
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{ "set-oneshot", 2, 2, 0, verb_set_efivar },
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