Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix missing hugetlb_lock for resv uncharge There is a recent report on UFFDIO_COPY over hugetlb: https://lore.kernel.org/all/000000000000ee06de0616177560@google.com/ 350: lockdep_assert_held(&hugetlb_lock); Should be an issue in hugetlb but triggered in an userfault context, where it goes into the unlikely path where two threads modifying the resv map together. Mike has a fix in that path for resv uncharge but it looks like the locking criteria was overlooked: hugetlb_cgroup_uncharge_folio_rsvd() will update the cgroup pointer, so it requires to be called with the lock held.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 79aa925bf239c234be8586780e482872dc4690dd before 4c806333efea1000a2a9620926f560ad2e1ca7cc; affected 79aa925bf239c234be8586780e482872dc4690dd before f6c5d21db16a0910152ec8aa9d5a7aed72694505; affected 79aa925bf239c234be8586780e482872dc4690dd before 538faabf31e9c53d8c870d114846fda958a0de10; affected 79aa925bf239c234be8586780e482872dc4690dd before b76b46902c2d0395488c8412e1116c2486cdfcb2; affected f87004c0b2bdf0f1066b88795d8e6c1dfad6cea0; affected 5.9.7 before 5.10 |
| Linux / Linux | affected 5.10; unaffected 0 before 5.10; unaffected 6.1.91 through 6.1.*; unaffected 6.6.30 through 6.6.*; unaffected 6.8.9 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4c806333efea1000a2a9620926f560ad2e1ca7cc
- https://git.kernel.org/stable/c/f6c5d21db16a0910152ec8aa9d5a7aed72694505
- https://git.kernel.org/stable/c/538faabf31e9c53d8c870d114846fda958a0de10
- https://git.kernel.org/stable/c/b76b46902c2d0395488c8412e1116c2486cdfcb2
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.