Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate lengths in dlm_mig_lockres_handler A node receiving a DLM_MIG_LOCKRES message trusts several fields of the peer-supplied dlm_migratable_lockres without validation. num_locks and lockname_len are bounded only on the sending side, and the message is never checked to actually carry num_locks migratable_lock entries. As a result dlm_process_recovery_data() walks mres->ml[0..num_locks) past the kmalloc(data_len) copy of the message (an out-of-bounds read that ends in a BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the fixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). Both are reachable by any node in the domain. Validate these fields right after dlm_grab(), before anything uses them -- including the not-joined error path, which already prints mres->lockname with the unbounded lockname_len as a %.*s precision. Reject the message unless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <= DLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the payload is large enough to hold the claimed locks. Conforming recovery and migration messages are unaffected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before 4a5798253212093b9ff7d90c6cfbe348bcda1594; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before dce05b17db862f47ff60614017abe639b2e71cad; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before 0e999d56917f861f97adb961617b1828c9eb4733; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before 77686fa5bba135252d348e2dacf481fc19f60c41; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before f33041906885f96e190cde54e61ddc69de39e3ee; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before 50c4cc9183e11f83427efbf770f54851f4471c02; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before a8facb1670b4a0612183198e758d9539ef628ed9; affected 6714d8e86bf443f6f7af50f9d432025649f091f5 before b54e03d9b3697d25f4a0063cf717d459c5e3ad94 |
| Linux / Linux | affected 2.6.16; unaffected 0 before 2.6.16; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594
- https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad
- https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733
- https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41
- https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee
- https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02
- https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9
- https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94