userfaultfd: don't pin the user memory in userfaultfd_file_create()

userfaultfd_file_create() increments mm->mm_users; this means that the
memory won't be unmapped/freed if mm owner exits/execs, and UFFDIO_COPY
after that can populate the orphaned mm more.

Change userfaultfd_file_create() and userfaultfd_ctx_put() to use
mm->mm_count to pin mm_struct.  This means that
atomic_inc_not_zero(mm->mm_users) is needed when we are going to
actually play with this memory.  Except handle_userfault() path doesn't
need this, the caller must already have a reference.

The patch adds the new trivial helper, mmget_not_zero(), it can have
more users.

Link: http://lkml.kernel.org/r/20160516172254.GA8595@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 66cdb44..2d97952 100644 (file)
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -137,7 +137,7 @@ static void userfaultfd_ctx_put(struct userfaultfd_ctx *ctx)
                VM_BUG_ON(waitqueue_active(&ctx->fault_wqh));
                VM_BUG_ON(spin_is_locked(&ctx->fd_wqh.lock));
                VM_BUG_ON(waitqueue_active(&ctx->fd_wqh));
-               mmput(ctx->mm);
+               mmdrop(ctx->mm);
                kmem_cache_free(userfaultfd_ctx_cachep, ctx);
        }
 }
@@ -434,6 +434,9 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
 
        ACCESS_ONCE(ctx->released) = true;
 
+       if (!mmget_not_zero(mm))
+               goto wakeup;
+
        /*
         * Flush page faults out of all CPUs. NOTE: all page faults
         * must be retried without returning VM_FAULT_SIGBUS if
@@ -466,7 +469,8 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
                vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
        }
        up_write(&mm->mmap_sem);
-
+       mmput(mm);
+wakeup:
        /*
         * After no new page faults can wait on this fault_*wqh, flush
         * the last page faults that may have been already waiting on
@@ -760,10 +764,12 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
        start = uffdio_register.range.start;
        end = start + uffdio_register.range.len;
 
+       ret = -ENOMEM;
+       if (!mmget_not_zero(mm))
+               goto out;
+
        down_write(&mm->mmap_sem);
        vma = find_vma_prev(mm, start, &prev);
-
-       ret = -ENOMEM;
        if (!vma)
                goto out_unlock;
 
@@ -864,6 +870,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
        } while (vma && vma->vm_start < end);
 out_unlock:
        up_write(&mm->mmap_sem);
+       mmput(mm);
        if (!ret) {
                /*
                 * Now that we scanned all vmas we can already tell
@@ -902,10 +909,12 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
        start = uffdio_unregister.start;
        end = start + uffdio_unregister.len;
 
+       ret = -ENOMEM;
+       if (!mmget_not_zero(mm))
+               goto out;
+
        down_write(&mm->mmap_sem);
        vma = find_vma_prev(mm, start, &prev);
-
-       ret = -ENOMEM;
        if (!vma)
                goto out_unlock;
 
@@ -998,6 +1007,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
        } while (vma && vma->vm_start < end);
 out_unlock:
        up_write(&mm->mmap_sem);
+       mmput(mm);
 out:
        return ret;
 }
@@ -1067,9 +1077,11 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx,
                goto out;
        if (uffdio_copy.mode & ~UFFDIO_COPY_MODE_DONTWAKE)
                goto out;
-
-       ret = mcopy_atomic(ctx->mm, uffdio_copy.dst, uffdio_copy.src,
-                          uffdio_copy.len);
+       if (mmget_not_zero(ctx->mm)) {
+               ret = mcopy_atomic(ctx->mm, uffdio_copy.dst, uffdio_copy.src,
+                                  uffdio_copy.len);
+               mmput(ctx->mm);
+       }
        if (unlikely(put_user(ret, &user_uffdio_copy->copy)))
                return -EFAULT;
        if (ret < 0)
@@ -1110,8 +1122,11 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx,
        if (uffdio_zeropage.mode & ~UFFDIO_ZEROPAGE_MODE_DONTWAKE)
                goto out;
 
-       ret = mfill_zeropage(ctx->mm, uffdio_zeropage.range.start,
-                            uffdio_zeropage.range.len);
+       if (mmget_not_zero(ctx->mm)) {
+               ret = mfill_zeropage(ctx->mm, uffdio_zeropage.range.start,
+                                    uffdio_zeropage.range.len);
+               mmput(ctx->mm);
+       }
        if (unlikely(put_user(ret, &user_uffdio_zeropage->zeropage)))
                return -EFAULT;
        if (ret < 0)
@@ -1289,12 +1304,12 @@ static struct file *userfaultfd_file_create(int flags)
        ctx->released = false;
        ctx->mm = current->mm;
        /* prevent the mm struct to be freed */
-       atomic_inc(&ctx->mm->mm_users);
+       atomic_inc(&ctx->mm->mm_count);
 
        file = anon_inode_getfile("[userfaultfd]", &userfaultfd_fops, ctx,
                                  O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS));
        if (IS_ERR(file)) {
-               mmput(ctx->mm);
+               mmdrop(ctx->mm);
                kmem_cache_free(userfaultfd_ctx_cachep, ctx);
        }
 out:

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 01fe1bb..6b3213d 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2723,12 +2723,17 @@ extern struct mm_struct * mm_alloc(void);
 
 /* mmdrop drops the mm and the page tables */
 extern void __mmdrop(struct mm_struct *);
-static inline void mmdrop(struct mm_struct * mm)
+static inline void mmdrop(struct mm_struct *mm)
 {
        if (unlikely(atomic_dec_and_test(&mm->mm_count)))
                __mmdrop(mm);
 }
 
+static inline bool mmget_not_zero(struct mm_struct *mm)
+{
+       return atomic_inc_not_zero(&mm->mm_users);
+}
+
 /* mmput gets rid of the mappings and all user-space */
 extern void mmput(struct mm_struct *);
 /* same as above but performs the slow path from the async kontext. Can