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From:   Michal Suchanek <msuchanek@suse.de>
Cc:     Michal Suchanek <msuchanek@suse.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
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        Martin Schwidefsky <schwidefsky@de.ibm.com>,
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        linux-s390@vger.kernel.org, kexec@lists.infradead.org,
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        stable@kernel.org
Subject: [PATCH 1/4] Fix arm64 kexec forbidding kernels signed with keys in the secondary keyring to boot
Date:   Tue, 15 Feb 2022 20:39:38 +0100
Message-Id: <83b3583f35c50c609739a8d857d14e8410293373.1644953683.git.msuchanek@suse.de>
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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@lists.infradead.org
Cc: keyrings@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Cc: stable@kernel.org
Signed-off-by: Michal Suchanek <msuchanek@suse.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