This is a note to let you know that I've just added the patch titled gpio: GPIOHANDLE_GET_LINE_VALUES_IOCTL: Fix another 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-another-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 d82aa4a8f2e8df9673ddb099262355da4c9b99b1 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen <lars@xxxxxxxxxx> Date: Tue, 18 Oct 2016 16:54:04 +0200 Subject: gpio: GPIOHANDLE_GET_LINE_VALUES_IOCTL: Fix another information leak From: Lars-Peter Clausen <lars@xxxxxxxxxx> commit d82aa4a8f2e8df9673ddb099262355da4c9b99b1 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 only the first element of the values array in the struct is set, which leaves the struct 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. Cc: stable@xxxxxxxxxxxxxxx Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events") 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 @@ -645,6 +645,8 @@ static long lineevent_ioctl(struct file if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { int val; + memset(&ghd, 0, sizeof(ghd)); + val = gpiod_get_value_cansleep(le->desc); if (val < 0) return val; 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