linux-surface/patches/6.15/0001-secureboot.patch

From 58aa22bec32223a605375d0aea0a961105ee3e50 Mon Sep 17 00:00:00 2001
From: Maximilian Luz <luzmaximilian@gmail.com>
Date: Sun, 9 Jun 2024 19:48:58 +0200
Subject: [PATCH] Revert "efi/x86: Set the PE/COFF header's NX compat flag
 unconditionally"

This reverts commit 891f8890a4a3663da7056542757022870b499bc1.

Revert because of compatibility issues of MS Surface devices and GRUB
with NX. In short, these devices get stuck on boot with NX advertised.
So to not advertise it, add the respective option back in.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Patchset: secureboot
---
 arch/x86/boot/header.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index b5c79f43359b..a1bbedd989e4 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -111,7 +111,11 @@ extra_header_fields:
 	.long	salign				# SizeOfHeaders
 	.long	0				# CheckSum
 	.word	IMAGE_SUBSYSTEM_EFI_APPLICATION	# Subsystem (EFI application)
+#ifdef CONFIG_EFI_DXE_MEM_ATTRIBUTES
 	.word	IMAGE_DLL_CHARACTERISTICS_NX_COMPAT	# DllCharacteristics
+#else
+	.word	0				# DllCharacteristics
+#endif
 #ifdef CONFIG_X86_32
 	.long	0				# SizeOfStackReserve
 	.long	0				# SizeOfStackCommit
-- 
2.50.0

From ce1b44f9e408c1bc34413c8a4558df3770700340 Mon Sep 17 00:00:00 2001
From: "J. Eduardo" <j.eduardo@gmail.com>
Date: Sun, 25 Aug 2024 14:17:45 +0200
Subject: [PATCH] PM: hibernate: Add a lockdown_hibernate parameter

This allows the user to tell the kernel that they know better (namely,
they secured their swap properly), and that it can enable hibernation.

Signed-off-by: Kelvie Wong <kelvie@kelvie.ca>
Link: https://github.com/linux-surface/kernel/pull/158
Link: https://gist.github.com/brknkfr/95d1925ccdbb7a2d18947c168dfabbee
Patchset: secureboot
---
 Documentation/admin-guide/kernel-parameters.txt |  5 +++++
 kernel/power/hibernate.c                        | 10 +++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 8f75ec177399..b6c4edfc3c13 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3200,6 +3200,11 @@
 			to extract confidential information from the kernel
 			are also disabled.
 
+	lockdown_hibernate	[HIBERNATION]
+			Enable hibernation even if lockdown is enabled. Enable this only if
+			your swap is encrypted and secured properly, as an attacker can
+			modify the kernel offline during hibernation.
+
 	locktorture.acq_writer_lim= [KNL]
 			Set the time limit in jiffies for a lock
 			acquisition.  Acquisitions exceeding this limit
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 5af9c7ee98cd..d52aa94e2fa2 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -38,6 +38,7 @@
 #include "power.h"
 
 
+static int lockdown_hibernate;
 static int nocompress;
 static int noresume;
 static int nohibernate;
@@ -98,7 +99,7 @@ bool hibernation_in_progress(void)
 bool hibernation_available(void)
 {
 	return nohibernate == 0 &&
-		!security_locked_down(LOCKDOWN_HIBERNATION) &&
+		(lockdown_hibernate || !security_locked_down(LOCKDOWN_HIBERNATION)) &&
 		!secretmem_active() && !cxl_mem_active();
 }
 
@@ -1440,6 +1441,12 @@ static int __init nohibernate_setup(char *str)
 	return 1;
 }
 
+static int __init lockdown_hibernate_setup(char *str)
+{
+	lockdown_hibernate = 1;
+	return 1;
+}
+
 static const char * const comp_alg_enabled[] = {
 #if IS_ENABLED(CONFIG_CRYPTO_LZO)
 	COMPRESSION_ALGO_LZO,
@@ -1498,3 +1505,4 @@ __setup("hibernate=", hibernate_setup);
 __setup("resumewait", resumewait_setup);
 __setup("resumedelay=", resumedelay_setup);
 __setup("nohibernate", nohibernate_setup);
+__setup("lockdown_hibernate", lockdown_hibernate_setup);
-- 
2.50.0