From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Lee, Chun-Yi" Subject: [RFC PATCH 01/16] PM / hibernate: define HMAC algorithm and digest size of swsusp Date: Thu, 16 Jul 2015 22:25:15 +0800 Message-ID: <1437056730-15247-2-git-send-email-jlee@suse.com> References: <1437056730-15247-1-git-send-email-jlee@suse.com> Return-path: In-Reply-To: <1437056730-15247-1-git-send-email-jlee-IBi9RG/b67k@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Rafael J. Wysocki" , Matthew Garrett , Len Brown , Pavel Machek , Josh Boyer , Vojtech Pavlik , Matt Fleming , Jiri Kosina , "H. Peter Anvin" , "Lee, Chun-Yi" List-Id: linux-efi@vger.kernel.org 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, add HIBERNATE_VERIFICATION kernel config. Signed-off-by: Lee, Chun-Yi --- include/linux/suspend.h | 5 +++++ kernel/power/Kconfig | 13 +++++++++++++ kernel/power/power.h | 1 + 3 files changed, 19 insertions(+) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 5efe743..6cd2a48 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 SWSUSP_HMAC "hmac(sha1)" +#define SWSUSP_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..f65fcf7 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -12,6 +12,7 @@ struct swsusp_info { unsigned long image_pages; unsigned long pages; unsigned long size; + u8 signature[SWSUSP_DIGEST_SIZE]; } __aligned(PAGE_SIZE); #ifdef CONFIG_HIBERNATION -- 1.8.4.5