CVE-2024-50199
Description
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.
How to fix
- linux linux_kernel5.4.285, 5.10.228, 5.15.169, 6.1.114, 6.6.58, 6.11.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.36 ≤ v < 5.4.285, 5.5 ≤ v < 5.10.228, 5.11 ≤ v < 5.15.169, 5.16 ≤ v < 6.1.114, 6.2 ≤ v < 6.6.58, 6.7 ≤ v < 6.11.5, 6.12 | 5.4.285, 5.10.228, 5.15.169, 6.1.114, 6.6.58, 6.11.5 |
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