Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before ba7f982cdb37ff5a7739dec85d7325ea66fc1496; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before 417d5838ca73c6331ae2fe692fab6c25c00d9a0b; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before e41710f5a61aca9d6baaa8f53908a927dd9e7aa7; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before 6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before bed2b9037806c62166a0ef9a559a1e7e3e1275b8; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f before 7528c4fb1237512ee18049f852f014eba80bbe8d |
| Linux / Linux | affected 2.6.36; unaffected 0 before 2.6.36; unaffected 5.4.285 through 5.4.*; unaffected 5.10.228 through 5.10.*; unaffected 5.15.169 through 5.15.*; unaffected 6.1.114 through 6.1.*; unaffected 6.6.58 through 6.6.*; unaffected 6.11.5 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
- https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
- https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
- https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
- https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
- https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
- https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
ADP enrichment
No English description supplied.