CVE-2022-50630
Description
In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: fix UAF in hugetlb_handle_userfault The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race, hugetlb_fault hugetlb_no_page /*unlock vma_lock */ hugetlb_handle_userfault handle_userfault /* unlock mm->mmap_lock*/ vm_mmap_pgoff do_mmap mmap_region munmap_vma_range /* clean old vma */ /* lock vma_lock again <--- UAF */ /* unlock vma_lock */ Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue. [1] https://lore.kernel.org/linux-mm/[email protected]/ [2] https://lore.kernel.org/linux-mm/[email protected]/
How to fix
- Linux Linux45c33966759ea1b4040c08dacda99ef623c0ca29, 0db2efb3bff879566f05341d94c3de00ac95c4cc, dd691973f67b2800a97db723b1ff6f07fdcf7f5a, 78504bcedb2f1bbfb353b4d233c24d641c4dda33, 958f32ce832ba781ac20e11bb2d12a9352ea28fc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 ≤ v < 45c33966759ea1b4040c08dacda99ef623c0ca29, 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 ≤ v < 0db2efb3bff879566f05341d94c3de00ac95c4cc, 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 ≤ v < dd691973f67b2800a97db723b1ff6f07fdcf7f5a, 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 ≤ v < 78504bcedb2f1bbfb353b4d233c24d641c4dda33, 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 ≤ v < 958f32ce832ba781ac20e11bb2d12a9352ea28fc, 4.11 | 45c33966759ea1b4040c08dacda99ef623c0ca29, 0db2efb3bff879566f05341d94c3de00ac95c4cc, dd691973f67b2800a97db723b1ff6f07fdcf7f5a, 78504bcedb2f1bbfb353b4d233c24d641c4dda33, 958f32ce832ba781ac20e11bb2d12a9352ea28fc |
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