CVE-2022-49220

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dax: make sure inodes are flushed before destroy cache<br /> <br /> A bug can be triggered by following command<br /> <br /> $ modprobe nd_pmem &amp;&amp; modprobe -r nd_pmem<br /> <br /> [ 10.060014] BUG dax_cache (Not tainted): Objects remaining in dax_cache on __kmem_cache_shutdown()<br /> [ 10.060938] Slab 0x0000000085b729ac objects=9 used=1 fp=0x000000004f5ae469 flags=0x200000000010200(slab|head|node)<br /> [ 10.062433] Call Trace:<br /> [ 10.062673] dump_stack_lvl+0x34/0x44<br /> [ 10.062865] slab_err+0x90/0xd0<br /> [ 10.063619] __kmem_cache_shutdown+0x13b/0x2f0<br /> [ 10.063848] kmem_cache_destroy+0x4a/0x110<br /> [ 10.064058] __x64_sys_delete_module+0x265/0x300<br /> <br /> This is caused by dax_fs_exit() not flushing inodes before destroy cache.<br /> To fix this issue, call rcu_barrier() before destroy cache.