diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2016-10-18 16:54:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-10 16:38:45 +0100 |
| commit | a23a59c56a53db7339e89b0b8b10edf79d1d0865 (patch) | |
| tree | ded6240022e6556dd19aa5595d1b9c365e5d9525 | |
| parent | 78ae767553e435d5c3d71521b39d52e3a2e226b1 (diff) | |
gpio: GPIO_GET_CHIPINFO_IOCTL: Fix information leak
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@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 44d976c238c1..6c443ddedb38 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -821,6 +821,8 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 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'; |