7.8

CVE-2023-53629

fs: dlm: fix use after free in midcomms commit

In the Linux kernel, the following vulnerability has been resolved:

fs: dlm: fix use after free in midcomms commit

While working on processing dlm message in softirq context I experienced
the following KASAN use-after-free warning:

[  151.760477] ==================================================================
[  151.761803] BUG: KASAN: use-after-free in dlm_midcomms_commit_mhandle+0x19d/0x4b0
[  151.763414] Read of size 4 at addr ffff88811a980c60 by task lock_torture/1347

[  151.765284] CPU: 7 PID: 1347 Comm: lock_torture Not tainted 6.1.0-rc4+ #2828
[  151.766778] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-3.module+el8.7.0+16134+e5908aa2 04/01/2014
[  151.768726] Call Trace:
[  151.769277]  <TASK>
[  151.769748]  dump_stack_lvl+0x5b/0x86
[  151.770556]  print_report+0x180/0x4c8
[  151.771378]  ? kasan_complete_mode_report_info+0x7c/0x1e0
[  151.772241]  ? dlm_midcomms_commit_mhandle+0x19d/0x4b0
[  151.773069]  kasan_report+0x93/0x1a0
[  151.773668]  ? dlm_midcomms_commit_mhandle+0x19d/0x4b0
[  151.774514]  __asan_load4+0x7e/0xa0
[  151.775089]  dlm_midcomms_commit_mhandle+0x19d/0x4b0
[  151.775890]  ? create_message.isra.29.constprop.64+0x57/0xc0
[  151.776770]  send_common+0x19f/0x1b0
[  151.777342]  ? remove_from_waiters+0x60/0x60
[  151.778017]  ? lock_downgrade+0x410/0x410
[  151.778648]  ? __this_cpu_preempt_check+0x13/0x20
[  151.779421]  ? rcu_lockdep_current_cpu_online+0x88/0xc0
[  151.780292]  _convert_lock+0x46/0x150
[  151.780893]  convert_lock+0x7b/0xc0
[  151.781459]  dlm_lock+0x3ac/0x580
[  151.781993]  ? 0xffffffffc0540000
[  151.782522]  ? torture_stop+0x120/0x120 [dlm_locktorture]
[  151.783379]  ? dlm_scan_rsbs+0xa70/0xa70
[  151.784003]  ? preempt_count_sub+0xd6/0x130
[  151.784661]  ? is_module_address+0x47/0x70
[  151.785309]  ? torture_stop+0x120/0x120 [dlm_locktorture]
[  151.786166]  ? 0xffffffffc0540000
[  151.786693]  ? lockdep_init_map_type+0xc3/0x360
[  151.787414]  ? 0xffffffffc0540000
[  151.787947]  torture_dlm_lock_sync.isra.3+0xe9/0x150 [dlm_locktorture]
[  151.789004]  ? torture_stop+0x120/0x120 [dlm_locktorture]
[  151.789858]  ? 0xffffffffc0540000
[  151.790392]  ? lock_torture_cleanup+0x20/0x20 [dlm_locktorture]
[  151.791347]  ? delay_tsc+0x94/0xc0
[  151.791898]  torture_ex_iter+0xc3/0xea [dlm_locktorture]
[  151.792735]  ? torture_start+0x30/0x30 [dlm_locktorture]
[  151.793606]  lock_torture+0x177/0x270 [dlm_locktorture]
[  151.794448]  ? torture_dlm_lock_sync.isra.3+0x150/0x150 [dlm_locktorture]
[  151.795539]  ? lock_torture_stats+0x80/0x80 [dlm_locktorture]
[  151.796476]  ? do_raw_spin_lock+0x11e/0x1e0
[  151.797152]  ? mark_held_locks+0x34/0xb0
[  151.797784]  ? _raw_spin_unlock_irqrestore+0x30/0x70
[  151.798581]  ? __kthread_parkme+0x79/0x110
[  151.799246]  ? trace_preempt_on+0x2a/0xf0
[  151.799902]  ? __kthread_parkme+0x79/0x110
[  151.800579]  ? preempt_count_sub+0xd6/0x130
[  151.801271]  ? __kasan_check_read+0x11/0x20
[  151.801963]  ? __kthread_parkme+0xec/0x110
[  151.802630]  ? lock_torture_stats+0x80/0x80 [dlm_locktorture]
[  151.803569]  kthread+0x192/0x1d0
[  151.804104]  ? kthread_complete_and_exit+0x30/0x30
[  151.804881]  ret_from_fork+0x1f/0x30
[  151.805480]  </TASK>

[  151.806111] Allocated by task 1347:
[  151.806681]  kasan_save_stack+0x26/0x50
[  151.807308]  kasan_set_track+0x25/0x30
[  151.807920]  kasan_save_alloc_info+0x1e/0x30
[  151.808609]  __kasan_slab_alloc+0x63/0x80
[  151.809263]  kmem_cache_alloc+0x1ad/0x830
[  151.809916]  dlm_allocate_mhandle+0x17/0x20
[  151.810590]  dlm_midcomms_get_mhandle+0x96/0x260
[  151.811344]  _create_message+0x95/0x180
[  151.811994]  create_message.isra.29.constprop.64+0x57/0xc0
[  151.812880]  send_common+0x129/0x1b0
[  151.813467]  _convert_lock+0x46/0x150
[  151.814074]  convert_lock+0x7b/0xc0
[  151.814648]  dlm_lock+0x3ac/0x580
[  151.815199]  torture_dlm_lock_sync.isra.3+0xe9/0x150 [dlm_locktorture]
[  151.816258]  torture_ex_iter+0xc3/0xea [dlm_locktorture]
[  151.817129]  lock_t
---truncated---
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.14 < 6.1.20
Linux ≫ Linux Kernel Version >= 6.2 < 6.2.3
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.19% 0.088
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/a3b0e9ac3c2447008db942d51f593841d8329e99
Patch
https://git.kernel.org/stable/c/a2de9f9b686c71b4fa3663ae374f5f643c46a446
Patch
https://git.kernel.org/stable/c/724b6bab0d75f1dc01fdfbf7fe8d4217a5cb90ba
Patch
https://git.kernel.org/stable/c/84d6ce2aef1d06a53f606211da68a2085dfeb50d