Към съдържанието
Търсене

CVE-2024-50066: Linux, състезание за ресурс

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: има публичен пример за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: mm/mremap: fix move_normal_pmd/retract_page_tables race In mremap(), move_page_tables() looks at the type of the PMD entry and the specified address range to figure out by which method the next chunk of page table entries should be moved. At that point, the mmap_lock is held in write mode, but no rmap locks are held yet. For PMD entries that point to page tables and are fully covered by the source address range, move_pgt_entry(NORMAL_PMD, ...) is called, which first takes rmap locks, then does move_normal_pmd(). move_normal_pmd() takes the necessary page table locks at source and destination, then moves an entire page table from the source to the destination. The problem is: The rmap locks, which protect against concurrent page table removal by retract_page_tables() in the THP code, are only taken after the PMD entry has been read and it has been decided how to move it. So we can race as follows (with two processes that have mappings of the same tmpfs file that is stored on a tmpfs mount with huge=advise); note that process A accesses page tables through the MM while process B does it through the file rmap: process A process B ========= ========= mremap mremap_to move_vma move_page_tables get_old_pmd alloc_new_pmd *** PREEMPT *** madvise(MADV_COLLAPSE) do_madvise madvise_walk_vmas madvise_vma_behavior madvise_collapse hpage_collapse_scan_file collapse_file retract_page_tables i_mmap_lock_read(mapping) pmdp_coll

Засегнати продукти

  • Linux Linux: 1d65b771bc08cd054cf6d3766a72e113dc46d62f преди 17396e32f975130b3e6251f024c8807d192e4c3e; 1d65b771bc08cd054cf6d3766a72e113dc46d62f преди 1552ce9ce8af47c0fe911682e5e1855e25851ca9; 1d65b771bc08cd054cf6d3766a72e113dc46d62f преди 6fa1066fc5d00cb9f1b0e83b7ff6ef98d26ba2aa
  • Linux Linux: 6.6; преди 6.6; 6.6.58 до 6.6.*; 6.11.5 до 6.11.*; от 6.12 нататък
  • linux linux_kernel: 6.6 преди 6.6.58; 6.6.58 преди 6.7; 6.11.5 преди 6.12; от 6.12 нататък; 1d65b771bc08 преди 17396e32f975; 1d65b771bc08 преди 1552ce9ce8af; 1d65b771bc08 преди 6fa1066fc5d0

Вид слабост

История

  • 23 октомври 2024 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2024-50066: Linux, състезание за ресурс | freedomonline.bg