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THREATINT
PUBLISHED

CVE-2024-36899

gpiolib: cdev: Fix use after free in lineinfo_changed_notify



Description

In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: Fix use after free in lineinfo_changed_notify The use-after-free issue occurs as follows: when the GPIO chip device file is being closed by invoking gpio_chrdev_release(), watched_lines is freed by bitmap_free(), but the unregistration of lineinfo_changed_nb notifier chain failed due to waiting write rwsem. Additionally, one of the GPIO chip's lines is also in the release process and holds the notifier chain's read rwsem. Consequently, a race condition leads to the use-after-free of watched_lines. Here is the typical stack when issue happened: [free] gpio_chrdev_release() --> bitmap_free(cdev->watched_lines) <-- freed --> blocking_notifier_chain_unregister() --> down_write(&nh->rwsem) <-- waiting rwsem --> __down_write_common() --> rwsem_down_write_slowpath() --> schedule_preempt_disabled() --> schedule() [use] st54spi_gpio_dev_release() --> gpio_free() --> gpiod_free() --> gpiod_free_commit() --> gpiod_line_state_notify() --> blocking_notifier_call_chain() --> down_read(&nh->rwsem); <-- held rwsem --> notifier_call_chain() --> lineinfo_changed_notify() --> test_bit(xxxx, cdev->watched_lines) <-- use after free The side effect of the use-after-free issue is that a GPIO line event is being generated for userspace where it shouldn't. However, since the chrdev is being closed, userspace won't have the chance to read that event anyway. To fix the issue, call the bitmap_free() function after the unregistration of lineinfo_changed_nb notifier chain.

Reserved 2024-05-30 | Published 2024-05-30 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

51c1064e82e77b39a49889287ca50709303e2f26 before 2dfbb920a89bdc58087672ad5325dc6c588b6860
affected

51c1064e82e77b39a49889287ca50709303e2f26 before 2d008d4961b039d2edce8976289773961b7e5fb5
affected

51c1064e82e77b39a49889287ca50709303e2f26 before d38c49f7bdf14381270736299e2ff68ec248a017
affected

51c1064e82e77b39a49889287ca50709303e2f26 before 95ca7c90eaf5ea8a8460536535101e3e81160e2a
affected

51c1064e82e77b39a49889287ca50709303e2f26 before ca710b5f40b8b16fdcad50bebd47f50e4c62d239
affected

51c1064e82e77b39a49889287ca50709303e2f26 before 02f6b0e1ec7e0e7d059dddc893645816552039da
affected

Default status
affected

5.7
affected

Any version before 5.7
unaffected

5.10.234
unaffected

5.15.177
unaffected

6.1.127
unaffected

6.6.31
unaffected

6.8.10
unaffected

6.9
unaffected

References

git.kernel.org/...c/2dfbb920a89bdc58087672ad5325dc6c588b6860

git.kernel.org/...c/2d008d4961b039d2edce8976289773961b7e5fb5

git.kernel.org/...c/d38c49f7bdf14381270736299e2ff68ec248a017

git.kernel.org/...c/95ca7c90eaf5ea8a8460536535101e3e81160e2a

git.kernel.org/...c/ca710b5f40b8b16fdcad50bebd47f50e4c62d239

git.kernel.org/...c/02f6b0e1ec7e0e7d059dddc893645816552039da

cve.org (CVE-2024-36899)

nvd.nist.gov (CVE-2024-36899)

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