Informazioni sul CVE-2024-41058
cachefiles: fix slab-use-after-free in fscache_withdraw_volume()
CWE ID: N/A
Base Score (CVSS): N/A
CVE: CVE-2024-41058
Descrizione: In the Linux kernel, a vulnerability has been resolved in the cachefiles: cachefiles: fix slab-use-after-free in fscache_withdraw_volume(). During a fault injection stress test, we encountered the following issue: ================================================================== BUG: KASAN: slab-use-after-free in fscache_withdraw_volume+0x2e1/0x370 Read of size 4 at addr ffff88810680be08 by task ondemand-04-dae/5798 CPU: 0 PID: 5798 Comm: ondemand-04-dae Not tainted 6.8.0-dirty #565 Call Trace: kasan_check_range+0xf6/0x1b0 fscache_withdraw_volume+0x2e1/0x370 cachefiles_withdraw_volume+0x31/0x50 cachefiles_withdraw_cache+0x3ad/0x900 cachefiles_put_unbind_pincount+0x1f6/0x250 cachefiles_daemon_release+0x13b/0x290 __fput+0x204/0xa00 task_work_run+0x139/0x230 Allocated by task 5820: __kmalloc+0x1df/0x4b0 fscache_alloc_volume+0x70/0x600 __fscache_acquire_volume+0x1c/0x610 erofs_fscache_register_volume+0x96/0x1a0 erofs_fscache_register_fs+0x49a/0x690 erofs_fc_fill_super+0x6c0/0xcc0 vfs_get_super+0xa9/0x140 vfs_get_tree+0x8e/0x300 do_new_mount+0x28c/0x580 […] Freed by task 5820: kfree+0xf1/0x2c0 fscache_put_volume.part.0+0x5cb/0x9e0 erofs_fscache_unregister_fs+0x157/0x1b0 erofs_kill_sb+0xd9/0x1c0 deactivate_locked_super+0xa3/0x100 vfs_get_super+0x105/0x140 vfs_get_tree+0x8e/0x300 do_new_mount+0x28c/0x580 […] The issue occurred because the reference count of `cachefiles_volume` was zero. The `fscache_put_volume` function was freeing it, so we waited for it to be removed from the cache. The fscache_volume in `cache->volumes` must not have been freed yet, but its reference count may be 0. Therefore, we use the `try_get_volume()` helper function to check its reference count and wait for it to be removed.
Vettore di attacco
Punteggio CVSS
Il CVSS è un sistema di valutazione che misura la gravità di una vulnerabilità informatica considerando fattori come l’impatto potenziale, la probabilità di attacco e la facilità di esecuzione.
Riassunto: .
Dettaglio del Vettore
| Metrica | Valore | Significato | Descrizione |
|---|
Riferimenti esterni
- https://git.kernel.org/stable/c/90f17e47f1e209c6a3c92a1d038a0a80c95c460e
- https://git.kernel.org/stable/c/9dd7f5663899ea13a6a73216106d9c13c37453e3
- https://git.kernel.org/stable/c/38b88d544216f806d93a273a62ff8ebe82254003
- https://git.kernel.org/stable/c/522018a0de6b6fcce60c04f86dfc5f0e4b6a1b36
Prodotti interessati
- Linux – Linux
- Linux – Linux