CVE-2024-50191

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ext4: don&amp;#39;t set SB_RDONLY after filesystem errors<br /> <br /> When the filesystem is mounted with errors=remount-ro, we were setting<br /> SB_RDONLY flag to stop all filesystem modifications. We knew this misses<br /> proper locking (sb-&gt;s_umount) and does not go through proper filesystem<br /> remount procedure but it has been the way this worked since early ext2<br /> days and it was good enough for catastrophic situation damage<br /> mitigation. Recently, syzbot has found a way (see link) to trigger<br /> warnings in filesystem freezing because the code got confused by<br /> SB_RDONLY changing under its hands. Since these days we set<br /> EXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all<br /> filesystem modifications, modifying SB_RDONLY shouldn&amp;#39;t be needed. So<br /> stop doing that.