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From:   Coiby Xu <coxu@redhat.com>
To:     kexec@lists.infradead.org
Cc:     linux-arm-kernel@lists.infradead.org, Baoquan He <bhe@redhat.com>,
        Dave Young <dyoung@redhat.com>, Will Deacon <will@kernel.org>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v5 3/3] arm64: kexec_file: use more system keyrings to verify kernel image signature
Date:   Fri,  1 Apr 2022 09:31:18 +0800
Message-Id: <20220401013118.348084-4-coxu@redhat.com>
In-Reply-To: <20220401013118.348084-1-coxu@redhat.com>
References: <20220401013118.348084-1-coxu@redhat.com>
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Currently, a problem faced by arm64 is if a kernel image is signed by a
MOK key, loading it via the kexec_file_load() system call would be
rejected with the error "Lockdown: kexec: kexec of unsigned images is
restricted; see man kernel_lockdown.7".

This patch allows to verify arm64 kernel image signature using not only
.builtin_trusted_keys but also .platform and .secondary_trusted_key
keyring.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Coiby Xu <coxu@redhat.com>
---
 arch/arm64/kernel/kexec_image.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
index 9ec34690e255..51af1c22d6da 100644
--- a/arch/arm64/kernel/kexec_image.c
+++ b/arch/arm64/kernel/kexec_image.c
@@ -14,7 +14,6 @@
 #include <linux/kexec.h>
 #include <linux/pe.h>
 #include <linux/string.h>
-#include <linux/verification.h>
 #include <asm/byteorder.h>
 #include <asm/cpufeature.h>
 #include <asm/image.h>
@@ -133,8 +132,7 @@ 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,
-				       VERIFYING_KEXEC_PE_SIGNATURE);
+	return kexec_kernel_verify_pe_sig(kernel, kernel_len);
 }
 #endif
 
-- 
2.34.1