Patch "kexec, KEYS, s390: Make use of built-in and secondary keyring for signature verification" has been added to the 5.4-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    kexec, KEYS, s390: Make use of built-in and secondary keyring for signature verification

to the 5.4-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:
     kexec-keys-s390-make-use-of-built-in-and-secondary-keyring-for-signature-verification.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From 0828c4a39be57768b8788e8cbd0d84683ea757e5 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <msuchanek at suse.de>
Date: Thu, 14 Jul 2022 21:40:27 +0800
Subject: kexec, KEYS, s390: Make use of built-in and secondary keyring for signature verification

From: Michal Suchanek <msuchanek at suse.de>

commit 0828c4a39be57768b8788e8cbd0d84683ea757e5 upstream.

commit e23a8020ce4e ("s390/kexec_file: Signature verification prototype")
adds support for KEXEC_SIG verification with keys from platform keyring
but the built-in keys and secondary keyring are not used.

Add support for the built-in keys and secondary keyring as x86 does.

Fixes: e23a8020ce4e ("s390/kexec_file: Signature verification prototype")
Cc: stable at vger.kernel.org
Cc: Philipp Rudo <prudo at linux.ibm.com>
Cc: kexec at lists.infradead.org
Cc: keyrings at vger.kernel.org
Cc: linux-security-module at vger.kernel.org
Signed-off-by: Michal Suchanek <msuchanek at suse.de>
Reviewed-by: "Lee, Chun-Yi" <jlee at suse.com>
Acked-by: Baoquan He <bhe at redhat.com>
Signed-off-by: Coiby Xu <coxu at redhat.com>
Acked-by: Heiko Carstens <hca at linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar at linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/s390/kernel/machine_kexec_file.c |   18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -29,6 +29,7 @@ int s390_verify_sig(const char *kernel,
 	const unsigned long marker_len = sizeof(MODULE_SIG_STRING) - 1;
 	struct module_signature *ms;
 	unsigned long sig_len;
+	int ret;
 
 	/* Skip signature verification when not secure IPLed. */
 	if (!ipl_secure_flag)
@@ -63,11 +64,18 @@ int s390_verify_sig(const char *kernel,
 		return -EBADMSG;
 	}
 
-	return verify_pkcs7_signature(kernel, kernel_len,
-				      kernel + kernel_len, sig_len,
-				      VERIFY_USE_PLATFORM_KEYRING,
-				      VERIFYING_MODULE_SIGNATURE,
-				      NULL, NULL);
+	ret = verify_pkcs7_signature(kernel, kernel_len,
+				     kernel + kernel_len, sig_len,
+				     VERIFY_USE_SECONDARY_KEYRING,
+				     VERIFYING_MODULE_SIGNATURE,
+				     NULL, NULL);
+	if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING))
+		ret = verify_pkcs7_signature(kernel, kernel_len,
+					     kernel + kernel_len, sig_len,
+					     VERIFY_USE_PLATFORM_KEYRING,
+					     VERIFYING_MODULE_SIGNATURE,
+					     NULL, NULL);
+	return ret;
 }
 #endif /* CONFIG_KEXEC_SIG */
 


Patches currently in stable-queue which might be from msuchanek at suse.de are

queue-5.4/kexec-keys-s390-make-use-of-built-in-and-secondary-keyring-for-signature-verification.patch