system/systemd
system/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd synced 2024-07-22 18:55:10 +00:00
Code Issues Actions 7 Packages Projects Releases Wiki Activity

bootctl: add kernel-identity command

Browse source 
The command takes a kernel as argument and checks what kind of kernel
the image is.  Returns one of uki, pe or unknown.
This commit is contained in:
Gerd Hoffmann 2023-01-16 18:58:21 +01:00
parent ab250890c0
commit 53c368d71b
5 changed files with 132 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
man/bootctl.xml
View file

@ -217,6 +217,19 @@
</variablelist>
</refsect1>
<refsect1>
<title><command>kernel</command> Commands</title>
<variablelist>
<varlistentry>
<term><option>kernel-identify</option> <replaceable>kernel</replaceable></term>
<listitem><para>Takes a kernel image as argument. Checks what kind of kernel the image is. Returns
one of uki, pe or unknown.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>

2
meson.build
View file

@ -2622,6 +2622,8 @@ if conf.get('HAVE_BLKID') == 1 and conf.get('HAVE_GNU_EFI') == 1
'src/boot/bootctl-status.h',
'src/boot/bootctl-systemd-efi-options.c',
'src/boot/bootctl-systemd-efi-options.h',
'src/boot/bootctl-uki.c',
'src/boot/bootctl-uki.h',
'src/boot/bootctl-util.c',
'src/boot/bootctl-util.h'],
include_directories : includes,

110
src/boot/bootctl-uki.c Normal file
View file

@ -0,0 +1,110 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "bootctl.h"
#include "bootctl-uki.h"
#include "fd-util.h"
#include "parse-util.h"
#include "pe-header.h"
#define MAX_SECTIONS 96
static const uint8_t dos_file_magic[2] = "MZ";
static const uint8_t pe_file_magic[4] = "PE\0\0";
static const uint8_t name_osrel[8] = ".osrel";
static const uint8_t name_linux[8] = ".linux";
static const uint8_t name_initrd[8] = ".initrd";
static int pe_sections(FILE *uki, struct PeSectionHeader **ret, size_t *ret_n) {
_cleanup_free_ struct PeSectionHeader *sections = NULL;
struct DosFileHeader dos;
struct PeHeader pe;
size_t scount;
uint64_t soff, items;
int rc;
items = fread(&dos, 1, sizeof(dos), uki);
if (items != sizeof(dos))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "DOS header read error");
if (memcmp(dos.Magic, dos_file_magic, sizeof(dos_file_magic)) != 0)
goto no_sections;
rc = fseek(uki, le32toh(dos.ExeHeader), SEEK_SET);
if (rc < 0)
return log_error_errno(errno, "seek to PE header");
items = fread(&pe, 1, sizeof(pe), uki);
if (items != sizeof(pe))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "PE header read error");
if (memcmp(pe.Magic, pe_file_magic, sizeof(pe_file_magic)) != 0)
goto no_sections;
soff = le32toh(dos.ExeHeader) + sizeof(pe) + le16toh(pe.FileHeader.SizeOfOptionalHeader);
rc = fseek(uki, soff, SEEK_SET);
if (rc < 0)
return log_error_errno(errno, "seek to PE section headers");
scount = le16toh(pe.FileHeader.NumberOfSections);
if (scount > MAX_SECTIONS)
goto no_sections;
sections = new(struct PeSectionHeader, scount);
if (!sections)
return log_oom();
items = fread(sections, sizeof(*sections), scount, uki);
if (items != scount)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "PE section header read error");
*ret = TAKE_PTR(sections);
*ret_n = scount;
return 0;
no_sections:
*ret = NULL;
*ret_n = 0;
return 0;
}
static int find_pe_section(struct PeSectionHeader *sections, size_t scount,
const uint8_t *name, size_t namelen, size_t *ret) {
for (size_t s = 0; s < scount; s++) {
if (memcmp_nn(sections[s].Name, sizeof(sections[s].Name),
name, namelen) == 0) {
if (ret)
*ret = s;
return 1;
}
}
return 0;
}
static bool is_uki(struct PeSectionHeader *sections, size_t scount) {
return (find_pe_section(sections, scount, name_osrel, sizeof(name_osrel), NULL) &&
find_pe_section(sections, scount, name_linux, sizeof(name_linux), NULL) &&
find_pe_section(sections, scount, name_initrd, sizeof(name_initrd), NULL));
}
int verb_kernel_identify(int argc, char *argv[], void *userdata) {
_cleanup_fclose_ FILE *uki = NULL;
_cleanup_free_ struct PeSectionHeader *sections = NULL;
size_t scount;
int rc;
uki = fopen(argv[1], "re");
if (!uki)
return log_error_errno(errno, "Failed to open UKI file '%s': %m", argv[1]);
rc = pe_sections(uki, &sections, &scount);
if (rc < 0)
return EXIT_FAILURE;
if (sections) {
if (is_uki(sections, scount)) {
puts("uki");
return EXIT_SUCCESS;
}
puts("pe");
return EXIT_SUCCESS;
}
puts("unknown");
return EXIT_SUCCESS;
}

3
src/boot/bootctl-uki.h Normal file
View file

@ -0,0 +1,3 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
int verb_kernel_identify(int argc, char *argv[], void *userdata);

4
src/boot/bootctl.c
View file

@ -9,6 +9,7 @@
#include "bootctl-set-efivar.h"
#include "bootctl-status.h"
#include "bootctl-systemd-efi-options.h"
#include "bootctl-uki.h"
#include "build.h"
#include "dissect-image.h"
#include "escape.h"
@ -150,6 +151,8 @@ static int help(int argc, char *argv[], void *userdata) {
" remove Remove systemd-boot from the ESP and EFI variables\n"
" is-installed Test whether systemd-boot is installed in the ESP\n"
" random-seed Initialize random seed in ESP and EFI variables\n"
"\n%3$skernel Commands:%4$s\n"
" kernel-identify Identify kernel image type.\n"
"\n%3$sOptions:%4$s\n"
" -h --help Show this help\n"
" --version Print version\n"
@ -406,6 +409,7 @@ static int bootctl_main(int argc, char *argv[]) {
{ "update", VERB_ANY, 1, 0, verb_install },
{ "remove", VERB_ANY, 1, 0, verb_remove },
{ "is-installed", VERB_ANY, 1, 0, verb_is_installed },
{ "kernel-identify", 2, 2, 0, verb_kernel_identify },
{ "list", VERB_ANY, 1, 0, verb_list },
{ "set-default", 2, 2, 0, verb_set_efivar },
{ "set-oneshot", 2, 2, 0, verb_set_efivar },