FAILED: patch "[PATCH] arm64: kexec_file: use more system keyrings to verify kernel" failed to apply to 5.18-stable tree

The patch below does not apply to the 5.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0d519cadf75184a24313568e7f489a7fc9b1be3b Mon Sep 17 00:00:00 2001
From: Coiby Xu <[email protected]>
Date: Thu, 14 Jul 2022 21:40:26 +0800
Subject: [PATCH] arm64: kexec_file: use more system keyrings to verify kernel image signature

Currently, when loading a kernel image via the kexec_file_load() system call, arm64 can only use the .builtin_trusted_keys keyring to verify a signature whereas x86 can use three more keyrings i.e. .secondary_trusted_keys, .machine and .platform keyrings. For example, one resulting problem is kexec'ing a kernel image would be rejected with the error "Lockdown: kexec: kexec of unsigned images is restricted; see man kernel_lockdown.7".

This patch set enables arm64 to make use of the same keyrings as x86 to verify the signature kexec'ed kernel image.

Fixes 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support")

Cc [email protected] # 105e10e2cf1c: kexec_file: drop weak attribute from functions

Cc [email protected] # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig

Cc [email protected] # 83b7bb2d49ae: kexec, KEYS: make the code in bzImage64_verify_sig generic

Acked-by Baoquan He <[email protected]>

Cc [email protected]

Cc [email protected]

Cc [email protected]

Co-developed-by Michal Suchanek <[email protected]>

Signed-off-by Michal Suchanek <[email protected]>

Acked-by Will Deacon <[email protected]>

Signed-off-by Coiby Xu <[email protected]>

Signed-off-by Mimi Zohar <[email protected]>

arch/arm64/kernel/kexec_image.c +1 -10

index 9ec34690e255..5ed6a585f21f 100644
@@ -14,7 +14,6 @@
 #include <linux/kexec.h>
 #include <linux/pe.h>
 #include <linux/string.h>
-#include <linux/verification.h>
 #include <asm/byteorder.h>
 #include <asm/cpufeature.h>
 #include <asm/image.h>

@@ -130,18 +129,10 @@ static void *image_load(struct kimage *image,
 	return NULL;
 }
 
-#ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
-static int image_verify_sig(const char *kernel, unsigned long kernel_len)
-{
-	return verify_pefile_signature(kernel, kernel_len, NULL,
-				       VERIFYING_KEXEC_PE_SIGNATURE);
-}
-#endif
-
 const struct kexec_file_ops kexec_image_ops = {
 	.probe = image_probe,
 	.load = image_load,
 #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
-	.verify_sig = image_verify_sig,
+	.verify_sig = kexec_kernel_verify_pe_sig,
 #endif
 };

Hi Greg,

This patch depends on three prerequisites but 5.18-stable tree has two prerequisites backported. So the full list of commit ids should be
backported is shown below,
1. c903dae8941d ("kexec, KEYS: make the code in bzImage64_verify_sig generic")
2. 0d519cadf751 ("arm64: kexec_file: use more system keyrings to verify kernel image signature")

$ git checkout -b arm_key_5.18.y stable/linux-5.18.y                Updating
files: 100% (43489/43489), done.
branch 'arm_key_5.18.y' set up to track 'stable/linux-5.18.y'.
Switched to a new branch 'arm_key_5.18.y'

$ git cherry-pick c903dae8941d 0d519cadf751 Auto-merging
include/linux/kexec.h
Auto-merging kernel/kexec_file.c
[arm_key_5.18.y f3c9c5542700] kexec, KEYS: make the code in bzImage64_verify_sig generic
 Date: Thu Jul 14 21:40:25 2022 +0800
 3 files changed, 25 insertions(+), 19 deletions(-)
[arm_key_5.18.y 532854860941] arm64: kexec_file: use more system keyrings to verify kernel image signature
 Date: Thu Jul 14 21:40:26 2022 +0800
 1 file changed, 1 insertion(+), 10 deletions(-)