Bugzilla: N/A
Upstream-status: Fedora mustard

From ab0f460f8349c7ccb400b2dc8937c0682c8a0f47 Mon Sep 17 00:00:00 2001
From: Josh Boyer <jwboyer@fedoraproject.org>
Date: Fri, 26 Oct 2012 14:02:09 -0400
Subject: [PATCH] hibernate: Disable in a signed modules environment

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 in
a secure modules environment.

Signed-off-by: Josh Boyer <jwboyer@fedoraproject.com>
---
 kernel/power/hibernate.c | 16 +++++++++++++++-
 kernel/power/main.c      |  7 ++++++-
 kernel/power/user.c      |  1 +
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index df88d55dc436..5c5834d7708b 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -28,6 +28,8 @@
 #include <linux/syscore_ops.h>
 #include <linux/ctype.h>
 #include <linux/genhd.h>
+#include <linux/efi.h>
+#include <linux/module.h>
 
 #include "power.h"
 
@@ -639,6 +641,10 @@ int hibernate(void)
 {
 	int error;
 
+	if (secure_modules()) {
+		return -EPERM;
+	}
+
 	lock_system_sleep();
 	/* The snapshot device should not be opened while we're running */
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
@@ -731,7 +737,7 @@ static int software_resume(void)
 	/*
 	 * If the user said "noresume".. bail out early.
 	 */
-	if (noresume)
+	if (noresume || secure_modules())
 		return 0;
 
 	/*
@@ -897,6 +903,11 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
 	int i;
 	char *start = buf;
 
+	if (efi_enabled(EFI_SECURE_BOOT)) {
+		buf += sprintf(buf, "[%s]\n", "disabled");
+		return buf-start;
+	}
+
 	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
 		if (!hibernation_modes[i])
 			continue;
@@ -931,6 +942,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
 	char *p;
 	int mode = HIBERNATION_INVALID;
 
+	if (secure_modules())
+		return -EPERM;
+
 	p = memchr(buf, '\n', n);
 	len = p ? p - buf : n;
 
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 573410d6647e..f5201093adc4 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -15,6 +15,7 @@
 #include <linux/workqueue.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
+#include <linux/efi.h>
 
 #include "power.h"
 
@@ -301,7 +302,11 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
 
 #endif
 #ifdef CONFIG_HIBERNATION
-	s += sprintf(s, "%s\n", "disk");
+	if (!efi_enabled(EFI_SECURE_BOOT)) {
+		s += sprintf(s, "%s\n", "disk");
+	} else {
+		s += sprintf(s, "\n");
+	}
 #else
 	if (s != buf)
 		/* convert the last space to a newline */
diff --git a/kernel/power/user.c b/kernel/power/user.c
index efe99dee9510..5f5d1026f1e2 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -25,6 +25,7 @@
 #include <linux/cpu.h>
 #include <linux/freezer.h>
 #include <linux/module.h>
+#include <linux/efi.h>
 
 #include <asm/uaccess.h>
 
-- 
1.9.3