Patch "gpio: GPIOHANDLE_GET_LINE_VALUES_IOCTL: Fix information leak" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

gpio: GPIOHANDLE_GET_LINE_VALUES_IOCTL: Fix information leak

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
gpio-gpiohandle_get_line_values_ioctl-fix-information-leak.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Lars-Peter Clausen <[email protected]>
Date: Tue, 18 Oct 2016 16:54:02 +0200
Subject: gpio: GPIOHANDLE_GET_LINE_VALUES_IOCTL: Fix information leak

From: Lars-Peter Clausen <[email protected]>

commit 3eded5d83bf4e36ad78775c7ceb44a45480b0abd upstream.

The GPIOHANDLE_GET_LINE_VALUES_IOCTL handler allocates a gpiohandle_data struct on the stack and then passes it to copy_to_user(). But depending on the number of requested line handles the struct is only partially initialized.

This exposes the previous, potentially sensitive, stack content to the issuing userspace application. To avoid this make sure that the struct is fully initialized.

---
 drivers/gpio/gpiolib.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -342,6 +342,8 @@ static long linehandle_ioctl(struct file
 	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
 		int val;
 
+		memset(&ghd, 0, sizeof(ghd));
+
 		/* TODO: check if descriptors are really input */
 		for (i = 0; i < lh->numdescs; i++) {
 			val = gpiod_get_value_cansleep(lh->descs[i]);

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/gpio-gpio_get_chipinfo_ioctl-fix-line-offset-validation.patch queue-4.8/gpio-gpio_get_line-handle-event-_ioctl-fix-file-descriptor-leak.patch queue-4.8/gpio-gpio_get_chipinfo_ioctl-fix-information-leak.patch queue-4.8/gpio-gpio_get_lineevent_ioctl-reject-invalid-line-and-event-flags.patch queue-4.8/gpio-gpiohandle_get_line_values_ioctl-fix-another-information-leak.patch queue-4.8/gpio-gpio_get_linehandle_ioctl-reject-invalid-line-flags.patch queue-4.8/gpio-gpio_get_lineevent_ioctl-validate-line-offset.patch queue-4.8/gpio-gpiohandle_get_line_values_ioctl-fix-information-leak.patch queue-4.8/gpio-gpio_get_linehandle_ioctl-validate-line-offset.patch