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

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

[gregkh]

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 <stable@vger.kernel.org>.

thanks,

greg k-h

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

From 0d519cadf75184a24313568e7f489a7fc9b1be3b Mon Sep 17 00:00:00 2001
From: Coiby Xu <coxu@redhat.com>
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: stable@vger.kernel.org # 105e10e2cf1c: kexec_file: drop weak attribute from functions
Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
Cc: stable@vger.kernel.org # 83b7bb2d49ae: kexec, KEYS: make the code in bzImage64_verify_sig generic
Acked-by: Baoquan He <bhe@redhat.com>
Cc: kexec@lists.infradead.org
Cc: keyrings@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Co-developed-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
index 9ec34690e255..5ed6a585f21f 100644
--- 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 *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
 };

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

[Coiby Xu]

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(-)

On Mon, Aug 15, 2022 at 05:33:04PM +0200, gregkh@linuxfoundation.org wrote:
>
>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 <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From 0d519cadf75184a24313568e7f489a7fc9b1be3b Mon Sep 17 00:00:00 2001
>From: Coiby Xu <coxu@redhat.com>
>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: stable@vger.kernel.org # 105e10e2cf1c: kexec_file: drop weak attribute from functions
>Cc: stable@vger.kernel.org # 34d5960af253: kexec: clean up arch_kexec_kernel_verify_sig
>Cc: stable@vger.kernel.org # 83b7bb2d49ae: kexec, KEYS: make the code in bzImage64_verify_sig generic
>Acked-by: Baoquan He <bhe@redhat.com>
>Cc: kexec@lists.infradead.org
>Cc: keyrings@vger.kernel.org
>Cc: linux-security-module@vger.kernel.org
>Co-developed-by: Michal Suchanek <msuchanek@suse.de>
>Signed-off-by: Michal Suchanek <msuchanek@suse.de>
>Acked-by: Will Deacon <will@kernel.org>
>Signed-off-by: Coiby Xu <coxu@redhat.com>
>Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
>
>diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
>index 9ec34690e255..5ed6a585f21f 100644
>--- 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 *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
> };
>

-- 
Best regards,
Coiby

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

[Greg KH]

On Thu, Aug 18, 2022 at 12:19:06PM +0800, Coiby Xu wrote:
> 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(-)

Both now queued up, thanks.

greg k-h