From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC59AC7618B for ; Wed, 24 Jul 2019 14:17:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A162222ADB for ; Wed, 24 Jul 2019 14:17:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387422AbfGXORs (ORCPT ); Wed, 24 Jul 2019 10:17:48 -0400 Received: from mx2.suse.de ([195.135.220.15]:34516 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726287AbfGXORs (ORCPT ); Wed, 24 Jul 2019 10:17:48 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id BF428AE44; Wed, 24 Jul 2019 14:17:46 +0000 (UTC) Message-ID: <1563977855.4670.8.camel@suse.com> Subject: Re: KASAN: use-after-free Read in usbhid_power From: Oliver Neukum To: syzbot , andreyknvl@google.com, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Date: Wed, 24 Jul 2019 16:17:35 +0200 In-Reply-To: <000000000000bb4247058e589a20@google.com> References: <000000000000bb4247058e589a20@google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Dienstag, den 23.07.2019, 05:48 -0700 schrieb syzbot: > > Freed by task 243: > save_stack+0x1b/0x80 /mm/kasan/common.c:71 > set_track /mm/kasan/common.c:79 [inline] > __kasan_slab_free+0x130/0x180 /mm/kasan/common.c:451 > slab_free_hook /mm/slub.c:1421 [inline] > slab_free_freelist_hook /mm/slub.c:1448 [inline] > slab_free /mm/slub.c:2994 [inline] > kfree+0xd7/0x280 /mm/slub.c:3949 > skb_free_head+0x8b/0xa0 /net/core/skbuff.c:588 > skb_release_data+0x41f/0x7c0 /net/core/skbuff.c:608 > skb_release_all+0x46/0x60 /net/core/skbuff.c:662 > __kfree_skb /net/core/skbuff.c:676 [inline] > consume_skb /net/core/skbuff.c:736 [inline] > consume_skb+0xc0/0x2f0 /net/core/skbuff.c:730 > skb_free_datagram+0x16/0xf0 /net/core/datagram.c:328 > netlink_recvmsg+0x65e/0xea0 /net/netlink/af_netlink.c:2001 > sock_recvmsg_nosec /net/socket.c:877 [inline] > sock_recvmsg /net/socket.c:894 [inline] > sock_recvmsg+0xca/0x110 /net/socket.c:890 > ___sys_recvmsg+0x271/0x5a0 /net/socket.c:2448 > __sys_recvmsg+0xe9/0x1b0 /net/socket.c:2497 > do_syscall_64+0xb7/0x560 /arch/x86/entry/common.c:301 > entry_SYSCALL_64_after_hwframe+0x49/0xbe How reliable is this trace? It seems very likely to me that this bug is the same bug as syzbot KASAN: use-after-free Read in hidraw_ioctl which shows a race with disconnect() instead of some networking code, which I really cannot fathom. Regards Oliver