cve-2024-36943
Vulnerability from cvelistv5
Published
2024-05-30 15:35
Modified
2024-12-19 09:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan make_uffd_wp_pte() was previously doing: pte = ptep_get(ptep); ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep, pte); But if another thread accessed or dirtied the pte between the first 2 calls, this could lead to loss of that information. Since ptep_modify_prot_start() gets and clears atomically, the following is the correct pattern and prevents any possible race. Any access after the first call would see an invalid pte and cause a fault: pte = ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep, pte);
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4
Impacted products
Vendor Product Version
Linux Linux Version: 6.7
Show details on NVD website

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