This is a note to let you know that I've just added the patch titled gpio: GPIO_GET_CHIPINFO_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-gpio_get_chipinfo_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 <stable@xxxxxxxxxxxxxxx> know about it. >From 0f4bbb233743bdfd51d47688b0bc2561f310488b Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen <lars@xxxxxxxxxx> Date: Tue, 18 Oct 2016 16:54:00 +0200 Subject: gpio: GPIO_GET_CHIPINFO_IOCTL: Fix information leak From: Lars-Peter Clausen <lars@xxxxxxxxxx> commit 0f4bbb233743bdfd51d47688b0bc2561f310488b upstream. The GPIO_GET_CHIPINFO_IOCTL handler allocates a gpiochip_info struct on the stack and then passes it to copy_to_user(). But depending on the length of the GPIO chip name and label 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. Fixes: 521a2ad6f862 ("gpio: add userspace ABI for GPIO line information") Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpio/gpiolib.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -821,6 +821,8 @@ static long gpio_ioctl(struct file *filp if (cmd == GPIO_GET_CHIPINFO_IOCTL) { struct gpiochip_info chipinfo; + memset(&chipinfo, 0, sizeof(chipinfo)); + strncpy(chipinfo.name, dev_name(&gdev->dev), sizeof(chipinfo.name)); chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; Patches currently in stable-queue which might be from lars@xxxxxxxxxx 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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html