2.7 KiB
CVE-2024-50280
Description
In the Linux kernel, the following vulnerability has been resolved:dm cache: fix flushing uninitialized delayed_work on cache_ctr errorAn unexpected WARN_ON from flush_work() may occur when cache creationfails, caused by destroying the uninitialized delayed_work waker in theerror path of cache_create(). For example, the warning appears on thesuperblock checksum error.Reproduce steps:dmsetup create cmeta --table "0 8192 linear /dev/sdc 0"dmsetup create cdata --table "0 65536 linear /dev/sdc 8192"dmsetup create corig --table "0 524288 linear /dev/sdc 262144"dd if=/dev/urandom of=/dev/mapper/cmeta bs=4k count=1 oflag=directdmsetup create cache --table "0 524288 cache /dev/mapper/cmeta /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0"Kernel logs:(snip)WARNING: CPU: 0 PID: 84 at kernel/workqueue.c:4178 __flush_work+0x5d4/0x890Fix by pulling out the cancel_delayed_work_sync() from the constructor'serror path. This patch doesn't affect the use-after-free fix forconcurrent dm_resume and dm_destroy (commit 6a459d8edbdb ("dm cache: FixUAF in destroy()")) as cache_dtr is not changed.
POC
Reference
No PoCs from references.