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Commit 0fb6bd06 authored by Kees Cook's avatar Kees Cook Committed by Jiri Kosina
Browse files

HID: LG: validate HID output report details 



A HID device could send a malicious output report that would cause the
lg, lg3, and lg4 HID drivers to write beyond the output report allocation
during an event, causing a heap overflow:

[  325.245240] usb 1-1: New USB device found, idVendor=046d, idProduct=c287
...
[  414.518960] BUG kmalloc-4096 (Not tainted): Redzone overwritten

Additionally, while lg2 did correctly validate the report details, it was
cleaned up and shortened.

CVE-2013-2893

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 41df7f6d

drivers/hid/hid-lg2ff.c

+3 −16
Original line number Diff line number Diff line
@@ -64,26 +64,13 @@ int lg2ff_init(struct hid_device *hid) 
	struct hid_report *report;

	struct hid_input *hidinput = list_entry(hid->inputs.next,

						struct hid_input, list);

	struct list_head *report_list =

			&hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct input_dev *dev = hidinput->input;

	int error;



	if (list_empty(report_list)) {

		hid_err(hid, "no output report found\n");

	/* Check that the report looks ok */

	report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);

	if (!report)

		return -ENODEV;

	}



	report = list_entry(report_list->next, struct hid_report, list);



	if (report->maxfield < 1) {

		hid_err(hid, "output report is empty\n");

		return -ENODEV;

	}

	if (report->field[0]->report_count < 7) {

		hid_err(hid, "not enough values in the field\n");

		return -ENODEV;

	}



	lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);

	if (!lg2ff)

drivers/hid/hid-lg3ff.c

+6 −23
Original line number Diff line number Diff line
@@ -66,10 +66,11 @@ static int hid_lg3ff_play(struct input_dev *dev, void *data, 
	int x, y;



/*

 * Maxusage should always be 63 (maximum fields)

 * likely a better way to ensure this data is clean

 * Available values in the field should always be 63, but we only use up to

 * 35. Instead, clear the entire area, however big it is.

 */

	memset(report->field[0]->value, 0, sizeof(__s32)*report->field[0]->maxusage);

	memset(report->field[0]->value, 0,

	       sizeof(__s32) * report->field[0]->report_count);



	switch (effect->type) {

	case FF_CONSTANT:
@@ -129,32 +130,14 @@ static const signed short ff3_joystick_ac[] = { 
int lg3ff_init(struct hid_device *hid)

{

	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);

	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct input_dev *dev = hidinput->input;

	struct hid_report *report;

	struct hid_field *field;

	const signed short *ff_bits = ff3_joystick_ac;

	int error;

	int i;



	/* Find the report to use */

	if (list_empty(report_list)) {

		hid_err(hid, "No output report found\n");

		return -1;

	}



	/* Check that the report looks ok */

	report = list_entry(report_list->next, struct hid_report, list);

	if (!report) {

		hid_err(hid, "NULL output report\n");

		return -1;

	}



	field = report->field[0];

	if (!field) {

		hid_err(hid, "NULL field\n");

		return -1;

	}

	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35))

		return -ENODEV;



	/* Assume single fixed device G940 */

	for (i = 0; ff_bits[i] >= 0; i++)

drivers/hid/hid-lg4ff.c

+1 −19
Original line number Diff line number Diff line
@@ -484,34 +484,16 @@ static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cde 
int lg4ff_init(struct hid_device *hid)

{

	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);

	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct input_dev *dev = hidinput->input;

	struct hid_report *report;

	struct hid_field *field;

	struct lg4ff_device_entry *entry;

	struct lg_drv_data *drv_data;

	struct usb_device_descriptor *udesc;

	int error, i, j;

	__u16 bcdDevice, rev_maj, rev_min;



	/* Find the report to use */

	if (list_empty(report_list)) {

		hid_err(hid, "No output report found\n");

		return -1;

	}



	/* Check that the report looks ok */

	report = list_entry(report_list->next, struct hid_report, list);

	if (!report) {

		hid_err(hid, "NULL output report\n");

	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))

		return -1;

	}



	field = report->field[0];

	if (!field) {

		hid_err(hid, "NULL field\n");

		return -1;

	}



	/* Check what wheel has been connected */

	for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {

drivers/hid/hid-lgff.c

+2 −15
Original line number Diff line number Diff line
@@ -128,27 +128,14 @@ static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude) 
int lgff_init(struct hid_device* hid)

{

	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);

	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct input_dev *dev = hidinput->input;

	struct hid_report *report;

	struct hid_field *field;

	const signed short *ff_bits = ff_joystick;

	int error;

	int i;



	/* Find the report to use */

	if (list_empty(report_list)) {

		hid_err(hid, "No output report found\n");

		return -1;

	}



	/* Check that the report looks ok */

	report = list_entry(report_list->next, struct hid_report, list);

	field = report->field[0];

	if (!field) {

		hid_err(hid, "NULL field\n");

		return -1;

	}

	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))

		return -ENODEV;



	for (i = 0; i < ARRAY_SIZE(devices); i++) {

		if (dev->id.vendor == devices[i].idVendor &&