On Mon, 15 Oct 2007, Al Viro wrote:
> This
> + if (get_user(len, (int __user *)arg))
> + return -EFAULT;
> + if (copy_to_user(*((__u8 **)(user_arg +
> + sizeof(__u32))),
> + dev->hid->rdesc, len))
> is an instant trouble
Ouch. My bad, I mis-merged from the wrong version of the branch when
preparing the branch to merge.
The patch below is needed. Thanks a lot for catching this. I will take
this through my tree in the next round of updates if Linus doesn't pick it
up.
From: Jiri Kosina <[email protected]>
HID: fix HIDIOCGRDESC memory access in hidraw
Fix bogus copying of data into userspace when HIDIOCGRDESC is issued.
HID-transport layer makes sure that dev->hid->rdesc is not larger than
HID_MAX_DESCRIPTOR_SIZE.
Signed-off-by: Jiri Kosina <[email protected]>
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 8503197..11ced6a 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -229,9 +229,15 @@ static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd
if (get_user(len, (int __user *)arg))
return -EFAULT;
- if (copy_to_user(*((__u8 **)(user_arg +
- sizeof(__u32))),
- dev->hid->rdesc, len))
+
+ if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
+ return -EINVAL;
+
+ if (copy_to_user(user_arg + offsetof(
+ struct hidraw_report_descriptor,
+ value[0]),
+ dev->hid->rdesc,
+ min(dev->hid->rsize, len)))
return -EFAULT;
return 0;
}
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 55e51f9..edb8024 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -29,13 +29,6 @@
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/timer.h>
-#include <linux/workqueue.h>
-#include <linux/input.h>
-
/*
* USB HID (Human Interface Device) interface class code
*/
@@ -69,6 +62,17 @@
#define HID_DT_REPORT (USB_TYPE_CLASS | 0x02)
#define HID_DT_PHYSICAL (USB_TYPE_CLASS | 0x03)
+#define HID_MAX_DESCRIPTOR_SIZE 4096
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <linux/input.h>
+
/*
* We parse each description item into this structure. Short items data
* values are expanded to 32-bit signed int, long items contain a pointer
@@ -311,7 +315,6 @@ struct hid_global {
* This is the local environment. It is persistent up the next main-item.
*/
-#define HID_MAX_DESCRIPTOR_SIZE 4096
#define HID_MAX_USAGES 8192
#define HID_DEFAULT_NUM_COLLECTIONS 16
@@ -560,4 +563,5 @@ static inline int hid_ff_init(struct hid_device *hid) { return -1; }
#define err_hid(format, arg...) printk(KERN_ERR "%s: " format "\n" , \
__FILE__ , ## arg)
#endif
+#endif
diff --git a/include/linux/hidraw.h b/include/linux/hidraw.h
index 6676cd5..0536f29 100644
--- a/include/linux/hidraw.h
+++ b/include/linux/hidraw.h
@@ -15,9 +15,11 @@
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#include <linux/hid.h>
+
struct hidraw_report_descriptor {
__u32 size;
- __u8 *value;
+ __u8 value[HID_MAX_DESCRIPTOR_SIZE];
};
struct hidraw_devinfo {
@@ -40,8 +42,6 @@ struct hidraw_devinfo {
/* kernel-only API declarations */
#ifdef __KERNEL__
-#include <linux/hid.h>
-
struct hidraw {
unsigned int minor;
int exist;
-
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