[09/27] uswsusp: Disable when the kernel is locked down

Message ID	20190325220954.29054-10-matthewgarrett@google.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-security-module-owner@kernel.org> Date: Mon, 25 Mar 2019 15:09:36 -0700 In-Reply-To: <20190325220954.29054-1-matthewgarrett@google.com> Message-Id: <20190325220954.29054-10-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190325220954.29054-1-matthewgarrett@google.com> Subject: [PATCH 09/27] uswsusp: Disable when the kernel is locked down From: Matthew Garrett <matthewgarrett@google.com> To: jmorris@namei.org Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, Matthew Garrett <mjg59@srcf.ucam.org>, James Morris <james.l.morris@oracle.com>, linux-pm@vger.kernel.org, pavel@ucw.cz, rjw@rjwysocki.net, Matthew Garrett <matthewgarrett@google.com> Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk
Series	[PULL,REQUEST] Lockdown patches for 5.2 \| expand [PULL,REQUEST] Lockdown patches for 5.2 [02/27] Enforce module signatures if the kernel is locked down [03/27] Restrict /dev/{mem,kmem,port} when the kernel is locked down [04/27] kexec_load: Disable at runtime if the kernel is locked down [05/27] Copy secure_boot flag in boot params across kexec reboot [06/27] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE [07/27] kexec_file: Restrict at runtime if the kernel is locked down [08/27] hibernate: Disable when the kernel is locked down [09/27] uswsusp: Disable when the kernel is locked down [10/27] PCI: Lock down BAR access when the kernel is locked down [11/27] x86: Lock down IO port access when the kernel is locked down [12/27] x86/msr: Restrict MSR access when the kernel is locked down [13/27] ACPI: Limit access to custom_method when the kernel is locked down [14/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down [15/27] acpi: Disable ACPI table override if the kernel is locked down [16/27] acpi: Disable APEI error injection if the kernel is locked down [17/27] Prohibit PCMCIA CIS storage when the kernel is locked down [18/27] Lock down TIOCSSERIAL [19/27] Lock down module params that specify hardware parameters (eg. ioport) [20/27] x86/mmiotrace: Lock down the testmmiotrace module [21/27] Lock down /proc/kcore [22/27] Lock down kprobes [23/27] bpf: Restrict kernel image access functions when the kernel is locked down [24/27] Lock down perf [25/27] debugfs: Restrict debugfs when the kernel is locked down [26/27] lockdown: Print current->comm in restriction messages [27/27] kexec: Allow kexec_file() with appropriate IMA policy when locked down

Message ID

20190325220954.29054-10-matthewgarrett@google.com (mailing list archive)

State

New, archived

Headers

Date: Mon, 25 Mar 2019 15:09:36 -0700
In-Reply-To: <20190325220954.29054-1-matthewgarrett@google.com>
Message-Id: <20190325220954.29054-10-matthewgarrett@google.com>
Mime-Version: 1.0
References: <20190325220954.29054-1-matthewgarrett@google.com>
Subject: [PATCH 09/27] uswsusp: Disable when the kernel is locked down
From: Matthew Garrett <matthewgarrett@google.com>
To: jmorris@namei.org
Cc: linux-security-module@vger.kernel.org,
        linux-kernel@vger.kernel.org, dhowells@redhat.com,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        James Morris <james.l.morris@oracle.com>,
        linux-pm@vger.kernel.org, pavel@ucw.cz, rjw@rjwysocki.net,
        Matthew Garrett <matthewgarrett@google.com>
Content-Type: text/plain; charset="UTF-8"
Sender: owner-linux-security-module@vger.kernel.org
Precedence: bulk

Series

[PULL,REQUEST] Lockdown patches for 5.2 | expand

Commit Message

Matthew Garrett March 25, 2019, 10:09 p.m. UTC

From: Matthew Garrett <mjg59@srcf.ucam.org>

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

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
cc: linux-pm@vger.kernel.org
Cc: pavel@ucw.cz
Cc: rjw@rjwysocki.net
Signed-off-by: Matthew Garrett <matthewgarrett@google.com>
---
 kernel/power/user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 2d8b60a3c86b..0305d513c274 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -52,6 +52,9 @@  static int snapshot_open(struct inode *inode, struct file *filp)
 	if (!hibernation_available())
 		return -EPERM;
 
+	if (kernel_is_locked_down("/dev/snapshot"))
+		return -EPERM;
+
 	lock_system_sleep();
 
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {

[09/27] uswsusp: Disable when the kernel is locked down

Commit Message

Patch