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HID: core: Sanitize event code and type when mapping input

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When calling into hid_map_usage(), the passed event code is
blindly stored as is, even if it doesn't fit in the associated bitmap.

This event code can come from a variety of sources, including devices
masquerading as input devices, only a bit more "programmable".

Instead of taking the event code at face value, check that it actually
fits the corresponding bitmap, and if it doesn't:
- spit out a warning so that we know which device is acting up
- NULLify the bitmap pointer so that we catch unexpected uses

Code paths that can make use of untrusted inputs can now check
that the mapping was indeed correct and bail out if not.

Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Marc Zyngier 2020-09-01 10:52:33 +01:00 committed by Benjamin Tissoires
parent bce1305c0e
commit 35556bed83
3 changed files with 35 additions and 13 deletions
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4
drivers/hid/hid-input.c
View File

@ -1132,6 +1132,10 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
}
mapped:
/* Mapping failed, bail out */
if (!bit)
return;
if (device->driver->input_mapped &&
device->driver->input_mapped(device, hidinput, field, usage,
&bit, &max) < 0) {

2
drivers/hid/hid-multitouch.c
View File

@ -856,6 +856,8 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
code = BTN_0 + ((usage->hid - 1) & HID_USAGE);
hid_map_usage(hi, usage, bit, max, EV_KEY, code);
if (!*bit)
return -1;
input_set_capability(hi->input, EV_KEY, code);
return 1;

42
include/linux/hid.h
View File

@ -959,34 +959,49 @@ static inline void hid_device_io_stop(struct hid_device *hid) {
* @max: maximal valid usage->code to consider later (out parameter)
* @type: input event type (EV_KEY, EV_REL, ...)
* @c: code which corresponds to this usage and type
*
* The value pointed to by @bit will be set to NULL if either @type is
* an unhandled event type, or if @c is out of range for @type. This
* can be used as an error condition.
*/
static inline void hid_map_usage(struct hid_input *hidinput,
struct hid_usage *usage, unsigned long **bit, int *max,
__u8 type, __u16 c)
__u8 type, unsigned int c)
{
struct input_dev *input = hidinput->input;
usage->type = type;
usage->code = c;
unsigned long *bmap = NULL;
unsigned int limit = 0;
switch (type) {
case EV_ABS:
*bit = input->absbit;
*max = ABS_MAX;
bmap = input->absbit;
limit = ABS_MAX;
break;
case EV_REL:
*bit = input->relbit;
*max = REL_MAX;
bmap = input->relbit;
limit = REL_MAX;
break;
case EV_KEY:
*bit = input->keybit;
*max = KEY_MAX;
bmap = input->keybit;
limit = KEY_MAX;
break;
case EV_LED:
*bit = input->ledbit;
*max = LED_MAX;
bmap = input->ledbit;
limit = LED_MAX;
break;
}
if (unlikely(c > limit || !bmap)) {
pr_warn_ratelimited("%s: Invalid code %d type %d\n",
input->name, c, type);
*bit = NULL;
return;
}
usage->type = type;
usage->code = c;
*max = limit;
*bit = bmap;
}
/**
@ -1000,7 +1015,8 @@ static inline void hid_map_usage_clear(struct hid_input *hidinput,
__u8 type, __u16 c)
{
hid_map_usage(hidinput, usage, bit, max, type, c);
clear_bit(c, *bit);
if (*bit)
clear_bit(usage->code, *bit);
}
/**