linux-kernel - [PATCH] Fix kexec forbidding kernels signed with custom platform keys to boot

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Date:   Wed, 15 Aug 2018 12:00:53 +0200
From:   Yannik Sembritzki <yannik@...britzki.me>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Yannik Sembritzki <yannik@...britzki.me>
Subject: [PATCH] Fix kexec forbidding kernels signed with custom platform keys to boot

---
 arch/x86/kernel/kexec-bzimage64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 7326078e..eaaa125d 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -532,7 +532,7 @@ static int bzImage64_cleanup(void *loader_data)
 static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
 {
 	return verify_pefile_signature(kernel, kernel_len,
-				       NULL,
+				       (void *)1UL,
 				       VERIFYING_KEXEC_PE_SIGNATURE);
 }
 #endif
-- 
2.17.1

The exact scenario under which this issue occurs is described here:
https://bugzilla.redhat.com/show_bug.cgi?id=1554113