This is a note to let you know that I've just added the patch titled
Fix kexec forbidding kernels signed with keys in the secondary keyring to boot
to the 4.18-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:
fix-kexec-forbidding-kernels-signed-with-keys-in-the-secondary-keyring-to-boot.patch
and it can be found in the queue-4.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea93102f32244e3f45c8b26260be77ed0cc1d16c Mon Sep 17 00:00:00 2001
From: Yannik Sembritzki <yannik@xxxxxxxxxxxxx>
Date: Thu, 16 Aug 2018 14:05:23 +0100
Subject: Fix kexec forbidding kernels signed with keys in the secondary keyring to boot
From: Yannik Sembritzki <yannik@xxxxxxxxxxxxx>
commit ea93102f32244e3f45c8b26260be77ed0cc1d16c upstream.
The 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().
Fixes: d3bfe84129f6 ("certs: Add a secondary system keyring that can be added to dynamically")
Signed-off-by: Yannik Sembritzki <yannik@xxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Cc: kexec@xxxxxxxxxxxxxxxxxxx
Cc: keyrings@xxxxxxxxxxxxxxx
Cc: linux-security-module@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxx
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/kexec-bzimage64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -532,7 +532,7 @@ static int bzImage64_cleanup(void *loade
static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
{
return verify_pefile_signature(kernel, kernel_len,
- NULL,
+ VERIFY_USE_SECONDARY_KEYRING,
VERIFYING_KEXEC_PE_SIGNATURE);
}
#endif
Patches currently in stable-queue which might be from yannik@xxxxxxxxxxxxx are
queue-4.18/replace-magic-for-trusting-the-secondary-keyring-with-define.patch
queue-4.18/fix-kexec-forbidding-kernels-signed-with-keys-in-the-secondary-keyring-to-boot.patch
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