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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 8A01CC432C0 for ; Fri, 29 Nov 2019 10:35:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 60175217D6 for ; Fri, 29 Nov 2019 10:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726770AbfK2KfL (ORCPT ); Fri, 29 Nov 2019 05:35:11 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:38351 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726215AbfK2KfK (ORCPT ); Fri, 29 Nov 2019 05:35:10 -0500 Received: by mail-io1-f70.google.com with SMTP id q4so20079984ion.5 for ; Fri, 29 Nov 2019 02:35:07 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=OGcjapQzLy7dUOOJVg8PgFzMbIK79uLO7twQWtJcTVg=; b=GNT+dnyGP0+NXWSoR/uKOYLJESHmwhwUNHiDYIpxbw5kGP3UVZYNf+Bqmy9ybldlef lX5DiB3C95IqwE5zfDo/xAp0Tu99IP7t+26dvRt8Q+MY2vM5QLpGSOUYfUx9GiZUQGBU 5kuiyJPglNFp+uL3uDzpbwkjbsVTvArML3ovzlSLEVdgb45YeIwtN/5Z2JIFhGsSCqqL 8bgGZTlnAzFcbAx8SElxc4vLnDLveXC8uuhTkKzbtOG3oJ6+JoW3fsZ38rOgY3zK4sMf y0+cb/5NN+C3yxaYkeGuV3L3Wbzbw79a0oeLDvPTAX/Ix+vVqFJDX4DvK0T8rvpddAED MRLg== X-Gm-Message-State: APjAAAWmVdxFQfEbn1rprsnsKrWZ4QUyG9TIjdLRIU/vMxku4N/yqrSY F8A7Dw6QfFyb9okHaFw31haBA8cvZnFThe9d1GIBdvN2zc7f X-Google-Smtp-Source: APXvYqyZ/qpLbF8G7/m0oN8CFhBaeKT++NcOzBx0xKuJJyRfyOqI+2t7pNtx6RmLAqJIFtZWoYhct7OpE46I2WDkiQTGmCA+lY18 MIME-Version: 1.0 X-Received: by 2002:a5d:8855:: with SMTP id t21mr46884865ios.138.1575023707562; Fri, 29 Nov 2019 02:35:07 -0800 (PST) Date: Fri, 29 Nov 2019 02:35:07 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009a2b62059879c830@google.com> Subject: KASAN: slab-out-of-bounds Read in chaoskey_disconnect From: syzbot To: alexandre.belloni@bootlin.com, andreyknvl@google.com, arnd@arndb.de, b.zolnierkie@samsung.com, gregkh@linuxfoundation.org, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, lvivier@redhat.com, mchehab+samsung@kernel.org, mpm@selenic.com, swboyd@chromium.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: da06441b usb: gadget: add raw-gadget interface git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=10dd88eee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=99c88c44660624e7 dashboard link: https://syzkaller.appspot.com/bug?extid=8632e5cd5a4e644e5745 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8632e5cd5a4e644e5745@syzkaller.appspotmail.com usb 3-1: USB disconnect, device number 46 ================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: slab-out-of-bounds in refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123 Read of size 4 at addr ffff8881d2771820 by task kworker/1:4/3303 CPU: 1 PID: 3303 Comm: kworker/1:4 Not tainted 5.4.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123 refcount_inc_checked+0x12/0x60 lib/refcount.c:156 get_task_struct include/linux/sched/task.h:110 [inline] kthread_stop+0x6c/0x610 kernel/kthread.c:554 hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1134 [inline] device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 device_del+0x420/0xb20 drivers/base/core.c:2376 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 hub_port_connect drivers/usb/core/hub.c:5035 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 25070: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483 kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:564 kvmalloc include/linux/mm.h:670 [inline] seq_buf_alloc fs/seq_file.c:32 [inline] seq_read+0x805/0x10f0 fs/seq_file.c:204 kernfs_fop_read+0xe9/0x560 fs/kernfs/file.c:251 __vfs_read+0x76/0x100 fs/read_write.c:425 vfs_read+0x1ea/0x430 fs/read_write.c:461 ksys_read+0x127/0x250 fs/read_write.c:587 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 25070: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1424 [inline] slab_free_freelist_hook mm/slub.c:1475 [inline] slab_free mm/slub.c:3025 [inline] kfree+0xe4/0x320 mm/slub.c:3977 kvfree+0x59/0x60 mm/util.c:593 seq_release+0x4f/0x80 fs/seq_file.c:360 kernfs_fop_release+0xf2/0x190 fs/kernfs/file.c:780 __fput+0x2d7/0x840 fs/file_table.c:280 task_work_run+0x13f/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881d2770000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2080 bytes to the right of 4096-byte region [ffff8881d2770000, ffff8881d2771000) The buggy address belongs to the page: page:ffffea000749dc00 refcount:1 mapcount:0 mapping:ffff8881da00c280 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d2771700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d2771780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8881d2771800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881d2771880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d2771900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.