linux-kernel - [PATCH 1/4] Fix arm64 kexec forbidding kernels signed with keys in the secondary keyring to boot

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Message-Id: <83b3583f35c50c609739a8d857d14e8410293373.1644953683.git.msuchanek@suse.de>
Date:   Tue, 15 Feb 2022 20:39:38 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Michal Suchanek <msuchanek@...e.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Philipp Rudo <prudo@...hat.com>, Baoquan He <bhe@...hat.com>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        Dave Young <dyoung@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Kairui Song <kasong@...hat.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kexec@...ts.infradead.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        stable@...nel.org
Subject: [PATCH 1/4] Fix arm64 kexec forbidding kernels signed with keys in the secondary keyring to boot

commit d3bfe84129f6 ("certs: Add a secondary system keyring that can be added to dynamically")
split of .system_keyring into .builtin_trusted_keys and
.secondary_trusted_keys broke kexec, thereby preventing kernels signed by
keys which are now in the secondary keyring from being kexec'd.

Fix this by passing VERIFY_USE_SECONDARY_KEYRING to
verify_pefile_signature().

Cherry-picked from
commit ea93102f3224 ("Fix kexec forbidding kernels signed with keys in the secondary keyring to boot")

Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support")
Cc: kexec@...ts.infradead.org
Cc: keyrings@...r.kernel.org
Cc: linux-security-module@...r.kernel.org
Cc: stable@...nel.org
Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 arch/arm64/kernel/kexec_image.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
index 9ec34690e255..1fbf2ee7c005 100644
--- a/arch/arm64/kernel/kexec_image.c
+++ b/arch/arm64/kernel/kexec_image.c
@@ -133,7 +133,8 @@ static void *image_load(struct kimage *image,
 #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,
+	return verify_pefile_signature(kernel, kernel_len,
+				       VERIFY_USE_SECONDARY_KEYRING,
 				       VERIFYING_KEXEC_PE_SIGNATURE);
 }
 #endif
-- 
2.31.1