From f62e1553500688ac70d6eb407ceb9c9852c69125 Mon Sep 17 00:00:00 2001 From: Jann Horn Date: Wed, 11 Jan 2023 14:33:51 +0100 Subject: [PATCH] mm/khugepaged: fix ->anon_vma race commit 023f47a8250c6bdb4aebe744db4bf7f73414028b upstream. If an ->anon_vma is attached to the VMA, collapse_and_free_pmd() requires it to be locked. Page table traversal is allowed under any one of the mmap lock, the anon_vma lock (if the VMA is associated with an anon_vma), and the mapping lock (if the VMA is associated with a mapping); and so to be able to remove page tables, we must hold all three of them. retract_page_tables() bails out if an ->anon_vma is attached, but does this check before holding the mmap lock (as the comment above the check explains). If we racily merged an existing ->anon_vma (shared with a child process) from a neighboring VMA, subsequent rmap traversals on pages belonging to the child will be able to see the page tables that we are concurrently removing while assuming that nothing else can access them. Repeat the ->anon_vma check once we hold the mmap lock to ensure that there really is no concurrent page table access. Hitting this bug causes a lockdep warning in collapse_and_free_pmd(), in the line "lockdep_assert_held_write(&vma->anon_vma->root->rwsem)". It can also lead to use-after-free access. Link: https://lore.kernel.org/linux-mm/CAG48ez3434wZBKFFbdx4M9j6eUwSUVPd4dxhzW_k_POneSDF+A@mail.gmail.com/ Link: https://lkml.kernel.org/r/20230111133351.807024-1-jannh@google.com Fixes: 43fcdf499b7c ("khugepaged: add support of collapse for tmpfs/shmem pages") Signed-off-by: Jann Horn Reported-by: Zach O'Keefe Acked-by: Kirill A. Shutemov Reviewed-by: Yang Shi Cc: David Hildenbrand Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/khugepaged.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index c982b250aa317..5c495bcb521e0 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1649,7 +1649,7 @@ static int retract_page_tables(struct address_space *mapping, pgoff_t pgoff, * has higher cost too. It would also probably require locking * the anon_vma. */ - if (vma->anon_vma) { + if (READ_ONCE(vma->anon_vma)) { result = SCAN_PAGE_ANON; goto next; } @@ -1677,6 +1677,18 @@ static int retract_page_tables(struct address_space *mapping, pgoff_t pgoff, result = SCAN_PTE_MAPPED_HUGEPAGE; if ((cc->is_khugepaged || is_target) && mmap_write_trylock(mm)) { + /* + * Re-check whether we have an ->anon_vma, because + * collapse_and_free_pmd() requires that either no + * ->anon_vma exists or the anon_vma is locked. + * We already checked ->anon_vma above, but that check + * is racy because ->anon_vma can be populated under the + * mmap lock in read mode. + */ + if (vma->anon_vma) { + result = SCAN_PAGE_ANON; + goto unlock_next; + } /* * When a vma is registered with uffd-wp, we can't * recycle the pmd pgtable because there can be pte -- 2.39.5