CVE-2023-53052

Description

In the Linux kernel, the following vulnerability has been resolved:cifs: fix use-after-free bug in refresh_cache_worker()The UAF bug occurred because we were putting DFS root sessions incifs_umount() while DFS cache refresher was being executed.Make DFS root sessions have same lifetime as DFS tcons so we can avoidthe use-after-free bug is DFS cache refresher and other places thatrequire IPCs to get new DFS referrals on. Also, get rid of mountgroup handling in DFS cache as we no longer need it.This fixes below use-after-free bug catched by KASAN[ 379.946955] BUG: KASAN: use-after-free in __refresh_tcon.isra.0+0x10b/0xc10 [cifs][ 379.947642] Read of size 8 at addr ffff888018f57030 by task kworker/u4:3/56[ 379.948096][ 379.948208] CPU: 0 PID: 56 Comm: kworker/u4:3 Not tainted 6.2.0-rc7-lku #23[ 379.948661] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOSrel-1.16.0-0-gd239552-rebuilt.opensuse.org 04/01/2014[ 379.949368] Workqueue: cifs-dfscache refresh_cache_worker [cifs][ 379.949942] Call Trace:[ 379.950113] [ 379.950260] dump_stack_lvl+0x50/0x67[ 379.950510] print_report+0x16a/0x48e[ 379.950759] __virt_addr_valid+0xd8/0x160[ 379.951040] __phys_addr+0x41/0x80[ 379.951285] kasan_report+0xdb/0x110[ 379.951533] __refresh_tcon.isra.0+0x10b/0xc10 [cifs][ 379.952056] __refresh_tcon.isra.0+0x10b/0xc10 [cifs][ 379.952585] __refresh_tcon.isra.0+0x10b/0xc10 [cifs][ 379.953096] __pfx___refresh_tcon.isra.0+0x10/0x10 [cifs][ 379.953637] __pfx___mutex_lock+0x10/0x10[ 379.953915] lock_release+0xb6/0x720[ 379.954167] __pfx_lock_acquire+0x10/0x10[ 379.954443] refresh_cache_worker+0x34e/0x6d0 [cifs][ 379.954960] __pfx_wb_workfn+0x10/0x10[ 379.955239] refresh_cache_worker+0x4ad/0x6d0 [cifs][ 379.955755] __pfx_refresh_cache_worker+0x10/0x10 [cifs][ 379.956323] __pfx_lock_acquired+0x10/0x10[ 379.956615] read_word_at_a_time+0xe/0x20[ 379.956898] lockdep_hardirqs_on_prepare+0x12/0x220[ 379.957235] process_one_work+0x535/0x990[ 379.957509] __pfx_process_one_work+0x10/0x10[ 379.957812] lock_acquired+0xb7/0x5f0[ 379.958069] __list_add_valid+0x37/0xd0[ 379.958341] __list_add_valid+0x37/0xd0[ 379.958611] worker_thread+0x8e/0x630[ 379.958861] __pfx_worker_thread+0x10/0x10[ 379.959148] kthread+0x17d/0x1b0[ 379.959369] __pfx_kthread+0x10/0x10[ 379.959630] ret_from_fork+0x2c/0x50[ 379.959879]

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234