kernel/sb-hibernate.patch

Bugzilla: N/A
Upstream-status: Fedora mustard

From 9cdffb6980a2c573844b4b87f907da24d68fb916 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 49e0a20fd010..777eff68e8ef 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -29,6 +29,8 @@
 #include <linux/ctype.h>
 #include <linux/genhd.h>
 #include <trace/events/power.h>
+#include <linux/module.h>
+#include <linux/efi.h>
 
 #include "power.h"
 
@@ -642,6 +644,10 @@ 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)) {
@@ -734,7 +740,7 @@ static int software_resume(void)
 	/*
 	 * If the user said "noresume".. bail out early.
 	 */
-	if (noresume)
+	if (noresume || secure_modules())
 		return 0;
 
 	/*
@@ -900,6 +906,11 @@ 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;
@@ -934,6 +945,9 @@ 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