mm: pass page directly instead of using folio_page
authorDev Jain <dev.jain@arm.com>
Wed, 6 Aug 2025 14:56:11 +0000 (20:26 +0530)
committerAndrew Morton <akpm@linux-foundation.org>
Tue, 12 Aug 2025 06:00:59 +0000 (23:00 -0700)
In commit_anon_folio_batch(), we iterate over all pages pointed to by the
PTE batch.  Therefore we need to know the first page of the batch;
currently we derive that via folio_page(folio, 0), but, that takes us to
the first (head) page of the folio instead - our PTE batch may lie in the
middle of the folio, leading to incorrectness.

Bite the bullet and throw away the micro-optimization of reusing the folio
in favour of code simplicity.  Derive the page and the folio in
change_pte_range, and pass the page too to commit_anon_folio_batch to fix
the aforementioned issue.

Link: https://lkml.kernel.org/r/20250806145611.3962-1-dev.jain@arm.com
Fixes: cac1db8c3aad ("mm: optimize mprotect() by PTE batching")
Reported-by: syzbot+57bcc752f0df8bb1365c@syzkaller.appspotmail.com
Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Debugged-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Cc: Zhenhua Huang <quic_zhenhuah@quicinc.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/mprotect.c

index 78bded7acf7952b30f3f6d131c45af578e57f140..113b489858341ff1d68af3596c1a695453493551 100644 (file)
@@ -120,9 +120,8 @@ static int mprotect_folio_pte_batch(struct folio *folio, pte_t *ptep,
 
 static bool prot_numa_skip(struct vm_area_struct *vma, unsigned long addr,
                           pte_t oldpte, pte_t *pte, int target_node,
-                          struct folio **foliop)
+                          struct folio *folio)
 {
-       struct folio *folio = NULL;
        bool ret = true;
        bool toptier;
        int nid;
@@ -131,7 +130,6 @@ static bool prot_numa_skip(struct vm_area_struct *vma, unsigned long addr,
        if (pte_protnone(oldpte))
                goto skip;
 
-       folio = vm_normal_folio(vma, addr, oldpte);
        if (!folio)
                goto skip;
 
@@ -173,7 +171,6 @@ static bool prot_numa_skip(struct vm_area_struct *vma, unsigned long addr,
                folio_xchg_access_time(folio, jiffies_to_msecs(jiffies));
 
 skip:
-       *foliop = folio;
        return ret;
 }
 
@@ -231,10 +228,9 @@ static int page_anon_exclusive_sub_batch(int start_idx, int max_len,
  * retrieve sub-batches.
  */
 static void commit_anon_folio_batch(struct vm_area_struct *vma,
-               struct folio *folio, unsigned long addr, pte_t *ptep,
+               struct folio *folio, struct page *first_page, unsigned long addr, pte_t *ptep,
                pte_t oldpte, pte_t ptent, int nr_ptes, struct mmu_gather *tlb)
 {
-       struct page *first_page = folio_page(folio, 0);
        bool expected_anon_exclusive;
        int sub_batch_idx = 0;
        int len;
@@ -251,7 +247,7 @@ static void commit_anon_folio_batch(struct vm_area_struct *vma,
 }
 
 static void set_write_prot_commit_flush_ptes(struct vm_area_struct *vma,
-               struct folio *folio, unsigned long addr, pte_t *ptep,
+               struct folio *folio, struct page *page, unsigned long addr, pte_t *ptep,
                pte_t oldpte, pte_t ptent, int nr_ptes, struct mmu_gather *tlb)
 {
        bool set_write;
@@ -270,7 +266,7 @@ static void set_write_prot_commit_flush_ptes(struct vm_area_struct *vma,
                                       /* idx = */ 0, set_write, tlb);
                return;
        }
-       commit_anon_folio_batch(vma, folio, addr, ptep, oldpte, ptent, nr_ptes, tlb);
+       commit_anon_folio_batch(vma, folio, page, addr, ptep, oldpte, ptent, nr_ptes, tlb);
 }
 
 static long change_pte_range(struct mmu_gather *tlb,
@@ -305,15 +301,19 @@ static long change_pte_range(struct mmu_gather *tlb,
                        const fpb_t flags = FPB_RESPECT_SOFT_DIRTY | FPB_RESPECT_WRITE;
                        int max_nr_ptes = (end - addr) >> PAGE_SHIFT;
                        struct folio *folio = NULL;
+                       struct page *page;
                        pte_t ptent;
 
+                       page = vm_normal_page(vma, addr, oldpte);
+                       if (page)
+                               folio = page_folio(page);
                        /*
                         * Avoid trapping faults against the zero or KSM
                         * pages. See similar comment in change_huge_pmd.
                         */
                        if (prot_numa) {
                                int ret = prot_numa_skip(vma, addr, oldpte, pte,
-                                                        target_node, &folio);
+                                                        target_node, folio);
                                if (ret) {
 
                                        /* determine batch to skip */
@@ -323,9 +323,6 @@ static long change_pte_range(struct mmu_gather *tlb,
                                }
                        }
 
-                       if (!folio)
-                               folio = vm_normal_folio(vma, addr, oldpte);
-
                        nr_ptes = mprotect_folio_pte_batch(folio, pte, oldpte, max_nr_ptes, flags);
 
                        oldpte = modify_prot_start_ptes(vma, addr, pte, nr_ptes);
@@ -351,7 +348,7 @@ static long change_pte_range(struct mmu_gather *tlb,
                         */
                        if ((cp_flags & MM_CP_TRY_CHANGE_WRITABLE) &&
                             !pte_write(ptent))
-                               set_write_prot_commit_flush_ptes(vma, folio,
+                               set_write_prot_commit_flush_ptes(vma, folio, page,
                                addr, pte, oldpte, ptent, nr_ptes, tlb);
                        else
                                prot_commit_flush_ptes(vma, addr, pte, oldpte, ptent,