CVE-2024-50199

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.

• linux linux kernel (>= 2.6.36 < 5.4.285) • linux linux kernel (>= 5.5 < 5.10.228) • linux linux kernel (>= 5.11 < 5.15.169) • linux linux kernel (>= 5.16 < 6.1.114) • linux linux kernel (>= 6.2 < 6.6.58) • linux linux kernel (>= 6.7 < 6.11.5) • linux linux kernel 6.12