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=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 04227C7618B for ; Wed, 24 Jul 2019 14:25:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAD3621738 for ; Wed, 24 Jul 2019 14:25:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Pmagx+/z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726593AbfGXOZK (ORCPT ); Wed, 24 Jul 2019 10:25:10 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:46188 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726166AbfGXOZK (ORCPT ); Wed, 24 Jul 2019 10:25:10 -0400 Received: by mail-pg1-f196.google.com with SMTP id k189so2280235pgk.13 for ; Wed, 24 Jul 2019 07:25:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=zeiboGSV7ypLA6dVtPYsNtNIh035XqkP74sEvzaLWW8=; b=Pmagx+/ziuTOsvielbY4z1LP1u14ot91S39ggDgrdZTUssRHH0vrvUR/uxFpkCYjBN WjMoRkhoe5I3OHMUlooZdztdfA6xrrwrofkfJq965JFnbnr0o52wIt5iWzm0kahaGFTu h9nSIU2rCswCk3Ez5biY2V3LuYv3lA7UZraFCg9LnLvFbalWqgIuT9KVjUNJfQsf2P8N I98AigjLweb3NRV2ApOuRPVLLAyzxfuyrtcaJ34BHJ8iXDRiwEkcqV+Rw3iIRPC0lshp pYLAkeF+C04MpVqPOCitVVUk13ccsAj6eUkj4KKya1in7YFPNizfJ37N5wPPL5TMb+At l/Ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=zeiboGSV7ypLA6dVtPYsNtNIh035XqkP74sEvzaLWW8=; b=UuxvMS36PvIBgbHyUlPccv4+XsSzL1A0lZnOkKNz92kjqSNmL3RtHRR/VsIbdxn2pc DvldX0KXDYq+5ZOqsRo2kQNgRa3yqGUcbHJcvIjD7rZexjExpZrqwBFP5ekqxcKX7LiR adkaxil4jx5xMj8G4wuGB5c9PPoCcX0s/oRl941uXaoOcoNeEQ/IY8c/gy7sTLYHT2+Y kkA1AAFg38eE6M495/4ycXvj+v+xY6TeFqjO8moLIITbhQb5BTEZ+wllvBUyayF+A+6A 1g46Nh8MbbjmHzAXDiXnJCvNhC6kMVqoiVKWloB9Ky9WDRIFjz3te+UW4gGzqPGi8sWM dmFA== X-Gm-Message-State: APjAAAVhTV8EvRiNNGq7DpEXzWa+Rt77yWuNwo0sqQcV8IHuIWHiKBPH NUiG3FqWQsl/4YDR0hJVJm2bem6YdtB9p33IxTLgsw== X-Google-Smtp-Source: APXvYqwfjIKHX+tJXl8xh6pWa+B5dCG49t49e2sDtBf7Bs0Yz/UNqB0hu6apHj84EXj2entUm4ziZIPPAJhdd+XcnxI= X-Received: by 2002:a63:c442:: with SMTP id m2mr82929692pgg.286.1563978309069; Wed, 24 Jul 2019 07:25:09 -0700 (PDT) MIME-Version: 1.0 References: <000000000000bb4247058e589a20@google.com> <1563977855.4670.8.camel@suse.com> In-Reply-To: <1563977855.4670.8.camel@suse.com> From: Andrey Konovalov Date: Wed, 24 Jul 2019 16:24:58 +0200 Message-ID: Subject: Re: KASAN: use-after-free Read in usbhid_power To: Oliver Neukum Cc: syzbot , syzkaller-bugs , LKML , USB list Content-Type: text/plain; charset="UTF-8" Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Wed, Jul 24, 2019 at 4:17 PM Oliver Neukum wrote: > > 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. To me the alloc/free stack trace doesn't seem to have anything to do with the access stack trace here, so I wouldn't rely on them. This is a limitation of KASAN and can happen when there's a wild memory access or a huge out-of-bounds or some kind of a racy-use-after-free. > > Regards > Oliver >