From 38bd94b8a1bd46e6d3d9718c7ff582e4c8ccb440 Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Mon, 19 Aug 2019 17:17:46 -0700 Subject: [PATCH] hibernate: Disable when the kernel is locked down There is currently no way to verify the resume image when returning from hibernate. This might compromise the signed modules trust model, so until we can work with signed hibernate images we disable it when the kernel is locked down. Signed-off-by: Josh Boyer Signed-off-by: David Howells Signed-off-by: Matthew Garrett Reviewed-by: Kees Cook Cc: rjw@rjwysocki.net Cc: pavel@ucw.cz cc: linux-pm@vger.kernel.org Signed-off-by: James Morris --- include/linux/security.h | 1 + kernel/power/hibernate.c | 3 ++- security/lockdown/lockdown.c | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/security.h b/include/linux/security.h index b607a8a..80ac7fb 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -106,6 +106,7 @@ enum lockdown_reason { LOCKDOWN_MODULE_SIGNATURE, LOCKDOWN_DEV_MEM, LOCKDOWN_KEXEC, + LOCKDOWN_HIBERNATION, LOCKDOWN_INTEGRITY_MAX, LOCKDOWN_CONFIDENTIALITY_MAX, }; diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index cd7434e..3c0a5a8 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include "power.h" @@ -68,7 +69,7 @@ static const struct platform_hibernation_ops *hibernation_ops; bool hibernation_available(void) { - return (nohibernate == 0); + return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION); } /** diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index aaf30ad..3462f7e 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -21,6 +21,7 @@ static char *lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = { [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading", [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port", [LOCKDOWN_KEXEC] = "kexec of unsigned images", + [LOCKDOWN_HIBERNATION] = "hibernation", [LOCKDOWN_INTEGRITY_MAX] = "integrity", [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", }; -- 2.7.4