linux-kernel - [PATCH 5.8 15/70] io_uring: Fix XArray usage in io_uring_add_task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 31 Oct 2020 12:35:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.8 15/70] io_uring: Fix XArray usage in io_uring_add_task_file

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

commit 236434c3438c4da3dfbd6aeeab807577b85e951a upstream.

The xas_store() wasn't paired with an xas_nomem() loop, so if it couldn't
allocate memory using GFP_NOWAIT, it would leak the reference to the file
descriptor.  Also the node pointed to by the xas could be freed between
the call to xas_load() under the rcu_read_lock() and the acquisition of
the xa_lock.

It's easier to just use the normal xa_load/xa_store interface here.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
[axboe: fix missing assign after alloc, cur_uring -> tctx rename]
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io_uring.c |   21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7929,27 +7929,24 @@ static void io_uring_cancel_task_request
  */
 static int io_uring_add_task_file(struct file *file)
 {
-	if (unlikely(!current->io_uring)) {
+	struct io_uring_task *tctx = current->io_uring;
+
+	if (unlikely(!tctx)) {
 		int ret;
 
 		ret = io_uring_alloc_task_context(current);
 		if (unlikely(ret))
 			return ret;
+		tctx = current->io_uring;
 	}
-	if (current->io_uring->last != file) {
-		XA_STATE(xas, &current->io_uring->xa, (unsigned long) file);
-		void *old;
+	if (tctx->last != file) {
+		void *old = xa_load(&tctx->xa, (unsigned long)file);
 
-		rcu_read_lock();
-		old = xas_load(&xas);
-		if (old != file) {
+		if (!old) {
 			get_file(file);
-			xas_lock(&xas);
-			xas_store(&xas, file);
-			xas_unlock(&xas);
+			xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL);
 		}
-		rcu_read_unlock();
-		current->io_uring->last = file;
+		tctx->last = file;
 	}
 
 	return 0;