linux-kernel - [PATCH 09/12] uswsusp: Disable when trusted

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Message-Id: <1393445473-15068-10-git-send-email-matthew.garrett@nebula.com>
Date:	Wed, 26 Feb 2014 15:11:10 -0500
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	linux-kernel@...r.kernel.org
Cc:	keescook@...omium.org, gregkh@...uxfoundation.org, hpa@...or.com,
	linux-efi@...r.kernel.org, jmorris@...ei.org,
	linux-security-module@...r.kernel.org,
	Matthew Garrett <matthew.garrett@...ula.com>
Subject: [PATCH 09/12] uswsusp: Disable when trusted_kernel is true

uswsusp allows a user process to dump and then restore kernel state, which
makes it possible to modify the running kernel. Disable this if
 trusted_kernel is true.

Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
---
 kernel/power/user.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 98d3575..2d7a5d3 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -24,6 +24,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <linux/security.h>
 
 #include <asm/uaccess.h>
 
@@ -49,6 +50,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 	struct snapshot_data *data;
 	int error;
 
+	if (get_trusted_kernel())
+		return -EPERM;
+
 	lock_system_sleep();
 
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
-- 
1.8.5.3

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