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72 lines
2.6 KiB
72 lines
2.6 KiB
6 months ago
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From dc742ee6411f4f7bd5d447cd29dc17a0025843e0 Mon Sep 17 00:00:00 2001
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From: Daan De Meyer <daan.j.demeyer@gmail.com>
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Date: Mon, 30 Jan 2023 16:26:50 +0100
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Subject: [PATCH] stub: Read extra kernel command line items from SMBIOS
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Let's read more kernel command line arguments from SMBIOS OEM string
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io.systemd.stub.kernel-cmdline-extra. This allows adding debug kernel
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command line arguments when booting in qemy without having to modify
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the UKI.
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(cherry picked from commit 717af0de4648ccc223f06683a6baf73d64271e02)
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Related: RHEL-16952
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---
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man/systemd-stub.xml | 17 +++++++++++++++++
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src/boot/efi/stub.c | 7 +++++++
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2 files changed, 24 insertions(+)
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diff --git a/man/systemd-stub.xml b/man/systemd-stub.xml
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index 85d30129d6..66c158c44d 100644
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--- a/man/systemd-stub.xml
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+++ b/man/systemd-stub.xml
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@@ -382,6 +382,23 @@
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default, this is done for the TPM2 PCR signature and public key files.</para>
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</refsect1>
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+ <refsect1>
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+ <title>SMBIOS Type 11 Strings</title>
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+
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+ <para><command>systemd-stub</command> can be configured using SMBIOS Type 11 strings. Applicable strings
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+ consist of a name, followed by <literal>=</literal>, followed by the value.
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+ <command>systemd-stub</command> will search the table for a string with a specific name, and if found,
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+ use its value. The following strings are read:</para>
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+
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+ <variablelist>
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+ <varlistentry>
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+ <term><varname>io.systemd.stub.kernel-cmdline-extra</varname></term>
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+ <listitem><para>If set, the value of this string is added to the list of kernel command line
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+ arguments that are passed to the kernel.</para></listitem>
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+ </varlistentry>
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+ </variablelist>
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+ </refsect1>
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+
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<refsect1>
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<title>Assembling Kernel Images</title>
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diff --git a/src/boot/efi/stub.c b/src/boot/efi/stub.c
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index dac1bb0606..86eae2e350 100644
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--- a/src/boot/efi/stub.c
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+++ b/src/boot/efi/stub.c
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@@ -16,6 +16,7 @@
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#include "splash.h"
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#include "tpm-pcr.h"
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#include "util.h"
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+#include "vmm.h"
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/* magic string to find in the binary image */
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_used_ _section_(".sdmagic") static const char magic[] = "#### LoaderInfo: systemd-stub " GIT_VERSION " ####";
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@@ -277,6 +278,12 @@ static EFI_STATUS real_main(EFI_HANDLE image) {
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mangle_stub_cmdline(cmdline);
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}
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+ const char *extra = smbios_find_oem_string("io.systemd.stub.kernel-cmdline-extra");
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+ if (extra) {
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+ _cleanup_free_ char16_t *tmp = TAKE_PTR(cmdline), *extra16 = xstr8_to_16(extra);
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+ cmdline = xasprintf("%ls %ls", tmp, extra16);
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+ }
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+
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export_variables(loaded_image);
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if (pack_cpio(loaded_image,
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