[PATCH 06/27] Copy secure_boot flag in boot params across kexec reboot
From: jlee@suse.com (joeyli)
Date: 2017-10-20 06:40:13
Also in:
linux-efi, lkml
On Thu, Oct 19, 2017 at 03:51:20PM +0100, David Howells wrote:
From: Dave Young <redacted> 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 <redacted> Signed-off-by: David Howells <dhowells@redhat.com> cc: kexec at lists.infradead.org
I have reviewed and tested this patch. Please feel free to add: Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com> Thanks a lot! Joey Lee
quoted hunk ↗ jump to hunk
--- 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 fb095ba0c02f..7d0fac5bcbbe 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; --To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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