CVE-2024-40969 Information

Description

In the Linux kernel the following vulnerability has been resolved:

f2fs: don’t set RO when shutting down f2fs

Shutdown does not check the error of thaw_super due to readonly which causes a deadlock like below.

f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC) issue_discard_thread

• bdev_freeze
• freeze_super
• f2fs_stop_checkpoint()
• f2fs_handle_critical_error - sb_start_write
  • set RO - waiting
• bdev_thaw
• thaw_super_locked
  • return -EINVAL if sb_rdonly()
• f2fs_stop_discard_thread -> wait for kthread_stop(discard_thread);

Reference

https://git.kernel.org/stable/c/1036d3ea7a32cb7cee00885c73a1f2ba7fbc499a https://git.kernel.org/stable/c/f47ed3b284b38f235355e281f57dfa8fffcc6563 https://git.kernel.org/stable/c/3bdb7f161697e2d5123b89fe1778ef17a44858e7