[RFC PATCH 01/16] PM / hibernate: define HMAC algorithm and digest size of swsusp
From: Lee, Chun-Yi <hidden>
Date: 2015-07-16 14:26:22
Also in:
linux-efi, lkml
Subsystem:
hibernation (aka software suspend, aka swsusp), suspend to ram, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
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 <jlee-IBi9RG/b67k@public.gmane.org> --- 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 <file:Documentation/power/swsusp.txt>. +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
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1.8.4.5