Patch "kexec, KEYS, s390: Make use of built-in and secondary keyring for signature verification" has been added to the 5.15-stable tree

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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 5.15-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:
     kexec-keys-s390-make-use-of-built-in-and-secondary-k.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 <stable@xxxxxxxxxxxxxxx> know about it.



commit 21898a1cb7606e9a5ce4befe24ac82f69647030c
Author: Michal Suchanek <msuchanek@xxxxxxx>
Date:   Thu Jul 14 21:40:27 2022 +0800

    kexec, KEYS, s390: Make use of built-in and secondary keyring for signature verification
    
    [ Upstream commit 0828c4a39be57768b8788e8cbd0d84683ea757e5 ]
    
    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@xxxxxxxxxxxxxxx
    Cc: Philipp Rudo <prudo@xxxxxxxxxxxxx>
    Cc: kexec@xxxxxxxxxxxxxxxxxxx
    Cc: keyrings@xxxxxxxxxxxxxxx
    Cc: linux-security-module@xxxxxxxxxxxxxxx
    Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
    Reviewed-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>
    Acked-by: Baoquan He <bhe@xxxxxxxxxx>
    Signed-off-by: Coiby Xu <coxu@xxxxxxxxxx>
    Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
    Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index a81d6c43b9b6..3459362c54ac 100644
--- 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, unsigned long kernel_len)
 	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, unsigned long kernel_len)
 		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 */
 



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