This is a note to let you know that I've just added the patch titled
arm64: kexec_file: use more system keyrings to verify kernel image signature
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-kexec_file-use-more-system-keyrings-to-verify-kernel-image-signature.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 0d519cadf75184a24313568e7f489a7fc9b1be3b Mon Sep 17 00:00:00 2001
From: Coiby Xu <[email protected]>
Date: Thu, 14 Jul 2022 21:40:26 +0800
Subject: arm64: kexec_file: use more system keyrings to verify kernel image
signature
From: Coiby Xu <[email protected]>
commit 0d519cadf75184a24313568e7f489a7fc9b1be3b upstream.
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]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm64/kernel/kexec_image.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
--- a/arch/arm64/kernel/kexec_image.c
+++ b/arch/arm64/kernel/kexec_image.c
@@ -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 *i
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
};
Patches currently in stable-queue which might be from [email protected] are
queue-5.15/arm64-kexec_file-use-more-system-keyrings-to-verify-kernel-image-signature.patch
queue-5.15/kexec-keys-make-the-code-in-bzimage64_verify_sig-generic.patch
queue-5.15/kexec-clean-up-arch_kexec_kernel_verify_sig.patch
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