userfaultfd: shmem: add i_size checks

With MAP_SHARED: recheck the i_size after taking the PT lock, to
serialize against truncate with the PT lock.  Delete the page from the
pagecache if the i_size_read check fails.

With MAP_PRIVATE: check the i_size after the PT lock before mapping
anonymous memory or zeropages into the MAP_PRIVATE shmem mapping.

A mostly irrelevant cleanup: like we do the delete_from_page_cache()
pagecache removal after dropping the PT lock, the PT lock is a spinlock
so drop it before the sleepable page lock.

Link: http://lkml.kernel.org/r/20181126173452.26955-5-aarcange@redhat.com
Fixes: 4c27fe4c4c84 ("userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support")
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Hugh Dickins <hughd@google.com>
Reported-by: Jann Horn <jannh@google.com>
Cc: <stable@vger.kernel.org>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 6c54a6874e4143524f5305daaf1063d8a313c5a0..99d5867daadb1fb8341f585d91377c0619cf49aa 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2216,6 +2216,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
        struct page *page;
        pte_t _dst_pte, *dst_pte;
        int ret;
+       pgoff_t offset, max_off;
 
        ret = -ENOMEM;
        if (!shmem_inode_acct_block(inode, 1))
@@ -2253,6 +2254,12 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
        __SetPageSwapBacked(page);
        __SetPageUptodate(page);
 
+       ret = -EFAULT;
+       offset = linear_page_index(dst_vma, dst_addr);
+       max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+       if (unlikely(offset >= max_off))
+               goto out_release;
+
        ret = mem_cgroup_try_charge_delay(page, dst_mm, gfp, &memcg, false);
        if (ret)
                goto out_release;
@@ -2268,8 +2275,14 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
        if (dst_vma->vm_flags & VM_WRITE)
                _dst_pte = pte_mkwrite(pte_mkdirty(_dst_pte));
 
-       ret = -EEXIST;
        dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
+
+       ret = -EFAULT;
+       max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+       if (unlikely(offset >= max_off))
+               goto out_release_uncharge_unlock;
+
+       ret = -EEXIST;
        if (!pte_none(*dst_pte))
                goto out_release_uncharge_unlock;
 
@@ -2287,13 +2300,14 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
 
        /* No need to invalidate - it was non-present before */
        update_mmu_cache(dst_vma, dst_addr, dst_pte);
-       unlock_page(page);
        pte_unmap_unlock(dst_pte, ptl);
+       unlock_page(page);
        ret = 0;
 out:
        return ret;
 out_release_uncharge_unlock:
        pte_unmap_unlock(dst_pte, ptl);
+       delete_from_page_cache(page);
 out_release_uncharge:
        mem_cgroup_cancel_charge(page, memcg, false);
 out_release:

diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 43cf314cfddd5eb4d0ccb9fa62c5ea15c1f51230..458acda96f2075472c3afcd6bc8a024684845019 100644 (file)
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -33,6 +33,8 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm,
        void *page_kaddr;
        int ret;
        struct page *page;
+       pgoff_t offset, max_off;
+       struct inode *inode;
 
        if (!*pagep) {
                ret = -ENOMEM;
@@ -73,8 +75,17 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm,
        if (dst_vma->vm_flags & VM_WRITE)
                _dst_pte = pte_mkwrite(pte_mkdirty(_dst_pte));
 
-       ret = -EEXIST;
        dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
+       if (dst_vma->vm_file) {
+               /* the shmem MAP_PRIVATE case requires checking the i_size */
+               inode = dst_vma->vm_file->f_inode;
+               offset = linear_page_index(dst_vma, dst_addr);
+               max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+               ret = -EFAULT;
+               if (unlikely(offset >= max_off))
+                       goto out_release_uncharge_unlock;
+       }
+       ret = -EEXIST;
        if (!pte_none(*dst_pte))
                goto out_release_uncharge_unlock;
 
@@ -108,11 +119,22 @@ static int mfill_zeropage_pte(struct mm_struct *dst_mm,
        pte_t _dst_pte, *dst_pte;
        spinlock_t *ptl;
        int ret;
+       pgoff_t offset, max_off;
+       struct inode *inode;
 
        _dst_pte = pte_mkspecial(pfn_pte(my_zero_pfn(dst_addr),
                                         dst_vma->vm_page_prot));
-       ret = -EEXIST;
        dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
+       if (dst_vma->vm_file) {
+               /* the shmem MAP_PRIVATE case requires checking the i_size */
+               inode = dst_vma->vm_file->f_inode;
+               offset = linear_page_index(dst_vma, dst_addr);
+               max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+               ret = -EFAULT;
+               if (unlikely(offset >= max_off))
+                       goto out_unlock;
+       }
+       ret = -EEXIST;
        if (!pte_none(*dst_pte))
                goto out_unlock;
        set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);