userfaultfd: convert userfaultfd_ctx::refcount to refcount_t

From: Eric Biggers <[email protected]>

Reference counters should use refcount_t rather than atomic_t, since the refcount_t implementation can prevent overflows, reducing the exploitability of reference leak bugs. userfaultfd_ctx::refcount is a reference counter with the usual semantics, so convert it to refcount_t.

Note: I replaced the BUG() on incrementing a 0 refcount with just refcount_inc(), since part of the semantics of refcount_t is that that incrementing a 0 refcount is not allowed; with CONFIG_REFCOUNT_FULL, refcount_inc() already checks for it and warns.

Signed-off-by Eric Biggers <[email protected]>

---
 fs/userfaultfd.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

fs/userfaultfd.c +5 -6

index 356d2b8568c14..8375faac2790d 100644
@@ -53,7 +53,7 @@ struct userfaultfd_ctx {
 	/* a refile sequence protected by fault_pending_wqh lock */
 	struct seqcount refile_seq;
 	/* pseudo fd refcounting */
-	atomic_t refcount;
+	refcount_t refcount;
 	/* userfaultfd syscall flags */
 	unsigned int flags;
 	/* features requested from the userspace */

@@ -140,8 +140,7 @@ static int userfaultfd_wake_function(wait_queue_entry_t *wq, unsigned mode,
  */
 static void userfaultfd_ctx_get(struct userfaultfd_ctx *ctx)
 {
-	if (!atomic_inc_not_zero(&ctx->refcount))
-		BUG();
+	refcount_inc(&ctx->refcount);
 }
 
 /**

@@ -154,7 +153,7 @@ static void userfaultfd_ctx_get(struct userfaultfd_ctx *ctx)
  */
 static void userfaultfd_ctx_put(struct userfaultfd_ctx *ctx)
 {
-	if (atomic_dec_and_test(&ctx->refcount)) {
+	if (refcount_dec_and_test(&ctx->refcount)) {
 		VM_BUG_ON(spin_is_locked(&ctx->fault_pending_wqh.lock));
 		VM_BUG_ON(waitqueue_active(&ctx->fault_pending_wqh));
 		VM_BUG_ON(spin_is_locked(&ctx->fault_wqh.lock));

@@ -686,7 +685,7 @@ int dup_userfaultfd(struct vm_area_struct *vma, struct list_head *fcs)
 			return -ENOMEM;
 		}
 
-		atomic_set(&ctx->refcount, 1);
+		refcount_set(&ctx->refcount, 1);
 		ctx->flags = octx->flags;
 		ctx->state = UFFD_STATE_RUNNING;
 		ctx->features = octx->features;

@@ -1911,7 +1910,7 @@ SYSCALL_DEFINE1(userfaultfd, int, flags)
 	if (!ctx)
 		return -ENOMEM;
 
-	atomic_set(&ctx->refcount, 1);
+	refcount_set(&ctx->refcount, 1);
 	ctx->flags = flags;
 	ctx->features = 0;
 	ctx->state = UFFD_STATE_WAIT_API;

Signature · 1 line

2.19.1.930.g4563a0d9d0-goog