gpio: prevent potential speculation leaks in gpio_device_get_desc()

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Userspace may trigger a speculative read of an address outside the gpio
descriptor array.
Users can do that by calling gpio_ioctl() with an offset out of range.
Offset is copied from user and then used as an array index to get
the gpio descriptor without sanitization in gpio_device_get_desc().

This change ensures that the offset is sanitized by using
array_index_nospec() to mitigate any possibility of speculative
information leaks.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
Link: https://lore.kernel.org/r/20240523085332.1801-1-hagarhem@amazon.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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Hagar Hemdan 2024-05-23 08:53:32 +00:00 • committed by Bartosz Golaszewski

parent 447e140e66

commit d795848ecc

1 changed files with 2 additions and 1 deletions

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drivers/gpio/gpiolib.c

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