Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933982AbbHKGRh (ORCPT ); Tue, 11 Aug 2015 02:17:37 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:35001 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933700AbbHKGR3 (ORCPT ); Tue, 11 Aug 2015 02:17:29 -0400 From: "Lee, Chun-Yi" X-Google-Original-From: "Lee, Chun-Yi" To: linux-kernel@vger.kernel.org Cc: linux-efi@vger.kernel.org, linux-pm@vger.kernel.org, "Rafael J. Wysocki" , Matthew Garrett , Len Brown , Pavel Machek , Josh Boyer , Vojtech Pavlik , Matt Fleming , Jiri Kosina , "H. Peter Anvin" , Ingo Molnar , "Lee, Chun-Yi" Subject: [PATCH v2 01/16] PM / hibernate: define HMAC algorithm and digest size of hibernation Date: Tue, 11 Aug 2015 14:16:21 +0800 Message-Id: <1439273796-25359-2-git-send-email-jlee@suse.com> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1439273796-25359-1-git-send-email-jlee@suse.com> References: <1439273796-25359-1-git-send-email-jlee@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2845 Lines: 87 Using HMAC-SHA1 to be the HMAC algorithm of signing hibernate snapshot image. The digest size of HMAC-SHA1 is 160 bits (20 bytes), this size will be also applied to the length of HMAC key. In addition, moved swsusp_info struct definition into CONFIG_HIBERNATION ifdef block because only hibernate code uses it. Add HIBERNATE_VERIFICATION kernel config for using by later hibernate signature verification code. Signed-off-by: Lee, Chun-Yi --- include/linux/suspend.h | 5 +++++ kernel/power/Kconfig | 13 +++++++++++++ kernel/power/power.h | 3 ++- 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 5efe743..56c6de9 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -327,6 +327,11 @@ struct platform_hibernation_ops { }; #ifdef CONFIG_HIBERNATION + +/* HMAC Algorithm of Hibernate Signature */ +#define HIBERNATION_HMAC "hmac(sha1)" +#define HIBERNATION_DIGEST_SIZE 20 + /* kernel/power/snapshot.c */ extern void __register_nosave_region(unsigned long b, unsigned long e, int km); static inline void __init register_nosave_region(unsigned long b, unsigned long e) diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 9e30231..8608b3b 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -66,6 +66,19 @@ config HIBERNATION For more information take a look at . +config HIBERNATE_VERIFICATION + bool "Hibernate verification" + depends on HIBERNATION + depends on EFI_STUB + depends on X86 + select CRYPTO_HMAC + select CRYPTO_SHA1 + help + This option provides support for generating and verifying the + signature of memory snapshot image by HMAC-SHA1. Current mechanism + relies on UEFI secure boot environment, EFI stub generates HMAC + key for hibernate verification. + config ARCH_SAVE_PAGE_KEYS bool diff --git a/kernel/power/power.h b/kernel/power/power.h index caadb56..6ea5c78 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -4,6 +4,7 @@ #include #include +#ifdef CONFIG_HIBERNATION struct swsusp_info { struct new_utsname uts; u32 version_code; @@ -12,9 +13,9 @@ struct swsusp_info { unsigned long image_pages; unsigned long pages; unsigned long size; + u8 signature[HIBERNATION_DIGEST_SIZE]; } __aligned(PAGE_SIZE); -#ifdef CONFIG_HIBERNATION /* kernel/power/snapshot.c */ extern void __init hibernate_reserved_size_init(void); extern void __init hibernate_image_size_init(void); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/