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gpio: Fix kernel stack leak to userspace

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The GPIO event descriptor was leaking kernel stack to
userspace because we don't zero the variable before
use. Ooops. Fix this.

Cc: stable@vger.kernel.org
Reported-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2018-01-22 13:19:28 +01:00
parent 2046362cf1
commit 24bd3efc9d
1 changed files with 3 additions and 0 deletions
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3
drivers/gpio/gpiolib.c
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@ -744,6 +744,9 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p)
struct gpioevent_data ge;
int ret, level;
/* Do not leak kernel stack to userspace */
memset(&ge, 0, sizeof(ge));
ge.timestamp = ktime_get_real_ns();
level = gpiod_get_value_cansleep(le->desc);