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@xxxxxxxxxxxxxxx> know about it.
>From 0828c4a39be57768b8788e8cbd0d84683ea757e5 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <msuchanek@xxxxxxx>
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@xxxxxxx>
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@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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxx are
queue-5.4/kexec-keys-s390-make-use-of-built-in-and-secondary-keyring-for-signature-verification.patch
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