From: Matthew Garrett <matthewgarrett@google.com>
To: jmorris@namei.org
Cc: Kees Cook <keescook@chromium.org>,
linux-api@vger.kernel.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, Matthew Garrett <mjg59@google.com>,
David Howells <dhowells@redhat.com>,
linux-security-module@vger.kernel.org,
Dave Young <dyoung@redhat.com>
Subject: [PATCH V36 07/29] Copy secure_boot flag in boot params across kexec reboot
Date: Thu, 18 Jul 2019 12:43:53 -0700 [thread overview]
Message-ID: <20190718194415.108476-8-matthewgarrett@google.com> (raw)
In-Reply-To: <20190718194415.108476-1-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>
Reviewed-by: Kees Cook <keescook@chromium.org>
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 5ebcd02cbca7..d2f4e706a428 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -180,6 +180,7 @@ 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;
--
2.22.0.510.g264f2c817a-goog
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next prev parent reply other threads:[~2019-07-18 19:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190718194415.108476-1-matthewgarrett@google.com>
2019-07-18 19:43 ` [PATCH V36 06/29] kexec_load: Disable at runtime if the kernel is locked down Matthew Garrett
2019-07-18 19:43 ` Matthew Garrett [this message]
2019-07-18 19:43 ` [PATCH V36 08/29] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 09/29] kexec_file: Restrict at runtime if the kernel is locked down Matthew Garrett
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