You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
2.6 KiB
60 lines
2.6 KiB
7 months ago
|
From ee8090db1c2fe4df29fd0b134d80791eced6434d Mon Sep 17 00:00:00 2001
|
||
|
|
From: Luca Boccassi <bluca@debian.org>
|
||
|
|
Date: Sun, 21 May 2023 15:18:21 +0100
|
||
|
|
Subject: [PATCH] stub: measure SMBIOS kernel-cmdline-extra in PCR12
|
||
|
|
|
||
|
|
PCR1, where SMBIOS strings are measured, is filled with data that is not
|
||
|
|
under the control of the machine owner. Measure cmdline extensions in
|
||
|
|
PCR12 too, where we measure other optional addons that are loaded by
|
||
|
|
sd-stub.
|
||
|
|
|
||
|
|
(cherry picked from commit 2c90b5ec63ab420d074ebe4f5c6881737c9bc155)
|
||
|
|
|
||
|
|
Related: RHEL-16952
|
||
|
|
---
|
||
|
|
man/systemd-stub.xml | 5 ++++-
|
||
|
|
src/boot/efi/stub.c | 7 +++++++
|
||
|
|
2 files changed, 11 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/man/systemd-stub.xml b/man/systemd-stub.xml
|
||
|
|
index 66c158c44d..edfc299bc2 100644
|
||
|
|
--- a/man/systemd-stub.xml
|
||
|
|
+++ b/man/systemd-stub.xml
|
||
|
|
@@ -66,6 +66,9 @@
|
||
|
|
<listitem><para>A compiled binary DeviceTree will be looked for in the <literal>.dtb</literal> PE
|
||
|
|
section.</para></listitem>
|
||
|
|
|
||
|
|
+ <listitem><para>Kernel version information, i.e. the output of <command>uname -r</command> for the
|
||
|
|
+ kernel included in the UKI, in the <literal>.uname</literal> PE section.</para></listitem>
|
||
|
|
+
|
||
|
|
<listitem><para>The kernel command line to pass to the invoked kernel will be looked for in the
|
||
|
|
<literal>.cmdline</literal> PE section.</para></listitem>
|
||
|
|
|
||
|
|
@@ -394,7 +397,7 @@
|
||
|
|
<varlistentry>
|
||
|
|
<term><varname>io.systemd.stub.kernel-cmdline-extra</varname></term>
|
||
|
|
<listitem><para>If set, the value of this string is added to the list of kernel command line
|
||
|
|
- arguments that are passed to the kernel.</para></listitem>
|
||
|
|
+ arguments that are measured in PCR12 and passed to the kernel.</para></listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
diff --git a/src/boot/efi/stub.c b/src/boot/efi/stub.c
|
||
|
|
index 86eae2e350..a195612f0e 100644
|
||
|
|
--- a/src/boot/efi/stub.c
|
||
|
|
+++ b/src/boot/efi/stub.c
|
||
|
|
@@ -282,6 +282,13 @@ static EFI_STATUS real_main(EFI_HANDLE image) {
|
||
|
|
if (extra) {
|
||
|
|
_cleanup_free_ char16_t *tmp = TAKE_PTR(cmdline), *extra16 = xstr8_to_16(extra);
|
||
|
|
cmdline = xasprintf("%ls %ls", tmp, extra16);
|
||
|
|
+
|
||
|
|
+ /* SMBIOS strings are measured in PCR1, but we also want to measure them in our specific
|
||
|
|
+ * PCR12, as firmware-owned PCRs are very difficult to use as they'll contain unpredictable
|
||
|
|
+ * measurements that are not under control of the machine owner. */
|
||
|
|
+ m = false;
|
||
|
|
+ (void) tpm_log_load_options(extra16, &m);
|
||
|
|
+ parameters_measured = parameters_measured < 0 ? m : (parameters_measured && m);
|
||
|
|
}
|
||
|
|
|
||
|
|
export_variables(loaded_image);
|