lkml.org 
[lkml]   [2016]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH 13/16] asus-wmi: Restrict debugfs interface when the kernel is locked down
From
Date
From: Matthew Garrett <matthew.garrett@nebula.com>

We have no way of validating what all of the Asus WMI methods do on a given
machine - and there's a risk that some will allow hardware state to be
manipulated in such a way that arbitrary code can be executed in the
kernel, circumventing module loading restrictions. Prevent that if the
kernel is locked down.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---

drivers/platform/x86/asus-wmi.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index ce6ca31a2d09..d860017f5240 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1872,6 +1872,9 @@ static int show_dsts(struct seq_file *m, void *data)
int err;
u32 retval = -1;

+ if (kernel_is_locked_down())
+ return -EPERM;
+
err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval);

if (err < 0)
@@ -1888,6 +1891,9 @@ static int show_devs(struct seq_file *m, void *data)
int err;
u32 retval = -1;

+ if (kernel_is_locked_down())
+ return -EPERM;
+
err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param,
&retval);

@@ -1912,6 +1918,9 @@ static int show_call(struct seq_file *m, void *data)
union acpi_object *obj;
acpi_status status;

+ if (kernel_is_locked_down())
+ return -EPERM;
+
status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
1, asus->debug.method_id,
&input, &output);
\
 
 \ /
  Last update: 2016-11-16 22:50    [W:0.601 / U:0.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site