CVE-2022-49270 Information

Description

In the Linux kernel the following vulnerability has been resolved:

dm: fix use-after-free in dm_cleanup_zoned_dev()

dm_cleanup_zoned_dev() uses queue so it must be called before blk_cleanup_disk() starts its killing:

blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()-> ->…RCU…->blk_free_queue_rcu()->kmem_cache_free()

Otherwise RCU callback may be executed first and dm_cleanup_zoned_dev() will touch free’d memory:

BUG: KASAN: use-after-free in dm_cleanup_zoned_dev+0x33/0xd0 Read of size 8 at addr ffff88805ac6e430 by task dmsetup/681

CPU: 4 PID: 681 Comm: dmsetup Not tainted 5.17.0-rc2+ 6 Hardware name: QEMU Standard PC (i440FX + PIIX 1996) BIOS 1.14.0-2 04/01/2014 Call Trace: dump_stack_lvl+0x57/0x7d print_address_description.constprop.0+0x1f/0x150 ? dm_cleanup_zoned_dev+0x33/0xd0 kasan_report.cold+0x7f/0x11b ? dm_cleanup_zoned_dev+0x33/0xd0 dm_cleanup_zoned_dev+0x33/0xd0 __dm_destroy+0x26a/0x400 ? dm_blk_ioctl+0x230/0x230 ? up_write+0xd8/0x270 dev_remove+0x156/0x1d0 ctl_ioctl+0x269/0x530 ? table_clear+0x140/0x140 ? lock_release+0xb2/0x750 ? remove_all+0x40/0x40 ? rcu_read_lock_sched_held+0x12/0x70 ? lock_downgrade+0x3c0/0x3c0 ? rcu_read_lock_sched_held+0x12/0x70 dm_ctl_ioctl+0xa/0x10 __x64_sys_ioctl+0xb9/0xf0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb6dfa95c27

Reference

https://git.kernel.org/stable/c/0987f00a76a17aa7213da492c00ed9e5a6210c73 https://git.kernel.org/stable/c/43a043aed964659bc69ef81f266912b73c80d837 https://git.kernel.org/stable/c/588b7f5df0cb64f281290c7672470c006abe7160 https://git.kernel.org/stable/c/fdfe414ca28ddfd562c233fb27385cf820de03e8