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From: Matthew Garrett <matthewgarrett@google.com>
To: jmorris@namei.org
Cc: linux-api@vger.kernel.org, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, Matthew Garrett <mjg59@google.com>,
	dhowells@redhat.com, linux-security-module@vger.kernel.org,
	luto@kernel.org, Dave Young <dyoung@redhat.com>
Subject: [PATCH V31 05/25] Copy secure_boot flag in boot params across kexec reboot
Date: Tue, 26 Mar 2019 11:27:21 -0700	[thread overview]
Message-ID: <20190326182742.16950-6-matthewgarrett@google.com> (raw)
In-Reply-To: <20190326182742.16950-1-matthewgarrett@google.com>

From: Dave Young <dyoung@redhat.com>

Kexec reboot in case secure boot being enabled does not keep the secure
boot mode in new kernel, so later one can load unsigned kernel via legacy
kexec_load.  In this state, the system is missing the protections provided
by secure boot.

Adding a patch to fix this by retain the secure_boot flag in original
kernel.

secure_boot flag in boot_params is set in EFI stub, but kexec bypasses the
stub.  Fixing this issue by copying secure_boot flag across kexec reboot.

Signed-off-by: Dave Young <dyoung@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
cc: kexec@lists.infradead.org
---
 arch/x86/kernel/kexec-bzimage64.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 278cd07228dd..d49554b948fd 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -179,6 +179,7 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
 	if (efi_enabled(EFI_OLD_MEMMAP))
 		return 0;
 
+	params->secure_boot = boot_params.secure_boot;
 	ei->efi_loader_signature = current_ei->efi_loader_signature;
 	ei->efi_systab = current_ei->efi_systab;
 	ei->efi_systab_hi = current_ei->efi_systab_hi;
-- 
2.21.0.392.gf8f6787159e-goog


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  parent reply	other threads:[~2019-03-26 18:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190326182742.16950-1-matthewgarrett@google.com>
2019-03-26 18:27 ` [PATCH V31 04/25] kexec_load: Disable at runtime if the kernel is locked down Matthew Garrett
2019-03-26 18:27 ` Matthew Garrett [this message]
2019-03-26 18:27 ` [PATCH V31 06/25] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE Matthew Garrett
2019-06-21  6:34   ` Dave Young
2019-06-21 20:13     ` Matthew Garrett
2019-06-21 20:14       ` Matthew Garrett
2019-03-26 18:27 ` [PATCH V31 07/25] kexec_file: Restrict at runtime if the kernel is locked down Matthew Garrett
2019-06-21  6:43   ` Dave Young
2019-06-21 20:18     ` Matthew Garrett
2019-06-24  1:52       ` Dave Young
2019-06-24 21:06         ` Matthew Garrett
2019-06-24 21:27           ` Mimi Zohar
2019-06-25  0:02             ` Matthew Garrett
2019-06-25  1:46               ` Mimi Zohar
2019-06-25  2:51           ` Dave Young

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