From 05e90bd05eea33fc77d6b11e121e2da01fee379f Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Thu, 12 May 2022 20:22:55 -0700 Subject: [PATCH] mm/hugetlb: only drop uffd-wp special pte if required As with shmem uffd-wp special ptes, only drop the uffd-wp special swap pte if unmapping an entire vma or synchronized such that faults can not race with the unmap operation. This requires passing zap_flags all the way to the lowest level hugetlb unmap routine: __unmap_hugepage_range. In general, unmap calls originated in hugetlbfs code will pass the ZAP_FLAG_DROP_MARKER flag as synchronization is in place to prevent faults. The exception is hole punch which will first unmap without any synchronization. Later when hole punch actually removes the page from the file, it will check to see if there was a subsequent fault and if so take the hugetlb fault mutex while unmapping again. This second unmap will pass in ZAP_FLAG_DROP_MARKER. The justification of "whether to apply ZAP_FLAG_DROP_MARKER flag when unmap a hugetlb range" is (IMHO): we should never reach a state when a page fault could errornously fault in a page-cache page that was wr-protected to be writable, even in an extremely short period. That could happen if e.g. we pass ZAP_FLAG_DROP_MARKER when hugetlbfs_punch_hole() calls hugetlb_vmdelete_list(), because if a page faults after that call and before remove_inode_hugepages() is executed, the page cache can be mapped writable again in the small racy window, that can cause unexpected data overwritten. [peterx@redhat.com: fix sparse warning] Link: https://lkml.kernel.org/r/Ylcdw8I1L5iAoWhb@xz-m1.local [akpm@linux-foundation.org: move zap_flags_t from mm.h to mm_types.h to fix build issues] Link: https://lkml.kernel.org/r/20220405014915.14873-1-peterx@redhat.com Signed-off-by: Peter Xu Reviewed-by: Mike Kravetz Cc: Alistair Popple Cc: Andrea Arcangeli Cc: Axel Rasmussen Cc: David Hildenbrand Cc: Hugh Dickins Cc: Jerome Glisse Cc: "Kirill A . Shutemov" Cc: Matthew Wilcox Cc: Mike Rapoport Cc: Nadav Amit Signed-off-by: Andrew Morton --- fs/hugetlbfs/inode.c | 15 +++++++++------ include/linux/hugetlb.h | 8 +++++--- include/linux/mm.h | 2 -- include/linux/mm_types.h | 2 ++ mm/hugetlb.c | 33 +++++++++++++++++++++++++-------- mm/memory.c | 5 ++++- 6 files changed, 45 insertions(+), 20 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 5915998..5945cac 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -405,7 +405,8 @@ static void remove_huge_page(struct page *page) } static void -hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end) +hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end, + zap_flags_t zap_flags) { struct vm_area_struct *vma; @@ -439,7 +440,7 @@ hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end) } unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, - NULL); + NULL, zap_flags); } } @@ -517,7 +518,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart, mutex_lock(&hugetlb_fault_mutex_table[hash]); hugetlb_vmdelete_list(&mapping->i_mmap, index * pages_per_huge_page(h), - (index + 1) * pages_per_huge_page(h)); + (index + 1) * pages_per_huge_page(h), + ZAP_FLAG_DROP_MARKER); i_mmap_unlock_write(mapping); } @@ -583,7 +585,8 @@ static void hugetlb_vmtruncate(struct inode *inode, loff_t offset) i_mmap_lock_write(mapping); i_size_write(inode, offset); if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) - hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); + hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0, + ZAP_FLAG_DROP_MARKER); i_mmap_unlock_write(mapping); remove_inode_hugepages(inode, offset, LLONG_MAX); } @@ -616,8 +619,8 @@ static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) i_mmap_lock_write(mapping); if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) hugetlb_vmdelete_list(&mapping->i_mmap, - hole_start >> PAGE_SHIFT, - hole_end >> PAGE_SHIFT); + hole_start >> PAGE_SHIFT, + hole_end >> PAGE_SHIFT, 0); i_mmap_unlock_write(mapping); remove_inode_hugepages(inode, hole_start, hole_end); inode_unlock(inode); diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index f1143f1..19cec41 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -143,11 +143,12 @@ long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, unsigned long *, unsigned long *, long, unsigned int, int *); void unmap_hugepage_range(struct vm_area_struct *, - unsigned long, unsigned long, struct page *); + unsigned long, unsigned long, struct page *, + zap_flags_t); void __unmap_hugepage_range_final(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, - struct page *ref_page); + struct page *ref_page, zap_flags_t zap_flags); void hugetlb_report_meminfo(struct seq_file *); int hugetlb_report_node_meminfo(char *buf, int len, int nid); void hugetlb_show_meminfo(void); @@ -406,7 +407,8 @@ static inline unsigned long hugetlb_change_protection( static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, - unsigned long end, struct page *ref_page) + unsigned long end, struct page *ref_page, + zap_flags_t zap_flags) { BUG(); } diff --git a/include/linux/mm.h b/include/linux/mm.h index 6178625..de32c038 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3428,8 +3428,6 @@ madvise_set_anon_name(struct mm_struct *mm, unsigned long start, } #endif -typedef unsigned int __bitwise zap_flags_t; - /* * Whether to drop the pte markers, for example, the uffd-wp information for * file-backed memory. This should only be specified when we will completely diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index dd38227..b34ff2c 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -863,4 +863,6 @@ enum fault_flag { FAULT_FLAG_ORIG_PTE_VALID = 1 << 11, }; +typedef unsigned int __bitwise zap_flags_t; + #endif /* _LINUX_MM_TYPES_H */ diff --git a/mm/hugetlb.c b/mm/hugetlb.c index ec9774e..99281ae 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4973,7 +4973,7 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma, static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, - struct page *ref_page) + struct page *ref_page, zap_flags_t zap_flags) { struct mm_struct *mm = vma->vm_mm; unsigned long address; @@ -5029,7 +5029,18 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct * unmapped and its refcount is dropped, so just clear pte here. */ if (unlikely(!pte_present(pte))) { - huge_pte_clear(mm, address, ptep, sz); + /* + * If the pte was wr-protected by uffd-wp in any of the + * swap forms, meanwhile the caller does not want to + * drop the uffd-wp bit in this zap, then replace the + * pte with a marker. + */ + if (pte_swp_uffd_wp_any(pte) && + !(zap_flags & ZAP_FLAG_DROP_MARKER)) + set_huge_pte_at(mm, address, ptep, + make_pte_marker(PTE_MARKER_UFFD_WP)); + else + huge_pte_clear(mm, address, ptep, sz); spin_unlock(ptl); continue; } @@ -5057,7 +5068,11 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct tlb_remove_huge_tlb_entry(h, tlb, ptep, address); if (huge_pte_dirty(pte)) set_page_dirty(page); - + /* Leave a uffd-wp pte marker if needed */ + if (huge_pte_uffd_wp(pte) && + !(zap_flags & ZAP_FLAG_DROP_MARKER)) + set_huge_pte_at(mm, address, ptep, + make_pte_marker(PTE_MARKER_UFFD_WP)); hugetlb_count_sub(pages_per_huge_page(h), mm); page_remove_rmap(page, vma, true); @@ -5091,9 +5106,10 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct void __unmap_hugepage_range_final(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, - unsigned long end, struct page *ref_page) + unsigned long end, struct page *ref_page, + zap_flags_t zap_flags) { - __unmap_hugepage_range(tlb, vma, start, end, ref_page); + __unmap_hugepage_range(tlb, vma, start, end, ref_page, zap_flags); /* * Clear this flag so that x86's huge_pmd_share page_table_shareable @@ -5109,12 +5125,13 @@ void __unmap_hugepage_range_final(struct mmu_gather *tlb, } void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, - unsigned long end, struct page *ref_page) + unsigned long end, struct page *ref_page, + zap_flags_t zap_flags) { struct mmu_gather tlb; tlb_gather_mmu(&tlb, vma->vm_mm); - __unmap_hugepage_range(&tlb, vma, start, end, ref_page); + __unmap_hugepage_range(&tlb, vma, start, end, ref_page, zap_flags); tlb_finish_mmu(&tlb); } @@ -5169,7 +5186,7 @@ static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, */ if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER)) unmap_hugepage_range(iter_vma, address, - address + huge_page_size(h), page); + address + huge_page_size(h), page, 0); } i_mmap_unlock_write(mapping); } diff --git a/mm/memory.c b/mm/memory.c index 8827157..82adda8 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1675,8 +1675,11 @@ static void unmap_single_vma(struct mmu_gather *tlb, * safe to do nothing in this case. */ if (vma->vm_file) { + zap_flags_t zap_flags = details ? + details->zap_flags : 0; i_mmap_lock_write(vma->vm_file->f_mapping); - __unmap_hugepage_range_final(tlb, vma, start, end, NULL); + __unmap_hugepage_range_final(tlb, vma, start, end, + NULL, zap_flags); i_mmap_unlock_write(vma->vm_file->f_mapping); } } else -- 2.7.4