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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CC9D9C433E0 for ; Fri, 7 Aug 2020 12:19:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A84EE221E2 for ; Fri, 7 Aug 2020 12:19:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728381AbgHGMTT (ORCPT ); Fri, 7 Aug 2020 08:19:19 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:42982 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727783AbgHGMTR (ORCPT ); Fri, 7 Aug 2020 08:19:17 -0400 Received: by mail-il1-f200.google.com with SMTP id a17so1373830ilk.9 for ; Fri, 07 Aug 2020 05:19:16 -0700 (PDT) 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=lTtdC+vCkszF8sYUSIwFc5FRid7eCFAUZQejKiH4rZ4=; b=ZQw8s/AyJwkGvk0nygN2AdcNVotU1V8wZ0vATpLNZfW8yMfeGzPXHghTjimEhcDtsY JL5TFHmNsGuBBKX6gWMcoXaJ4oxJMdJySO91g3I/1ZQDWa/NMgtWeFhW3myS1X7gu8Rr nA5AeBjkGdo0baJnO4uCrY3HMAczVQvTZVQCNUUtdGzM6GC0jQmnZ4UJeQoUVPPbxiSg +sz8dxvK5g8WHOz+anEM46HaEoZDxAnFsnSRcGOi7asDLLtdDEJsqS55zMPUA5BXKlG9 5dn5392Z3q0Z9fuZzCcn6ekoXwyGhFRznOFFzlQg5zts7Q399AWGY9z7wNJy9or9ycql xc0A== X-Gm-Message-State: AOAM530BgVDDn9HEEb7mr2S/su019YLIz3HleiwWuwIv3no/p/U1T6Eb qHAGgqw8iIEqrBkGVFR2e5Hd+nOaUQMpQVZ9yjsj+D2RYF69 X-Google-Smtp-Source: ABdhPJzi0MVNUkZtYsJ4KYJoCAoCWdPB8jH+AwlKoJIupbnYoEVZqJInqSVTShxc4KiyI5iqyUfm9JEEpOaFkFEv3AnE2MiCj5kH MIME-Version: 1.0 X-Received: by 2002:a05:6638:bc2:: with SMTP id g2mr4666407jad.21.1596802756269; Fri, 07 Aug 2020 05:19:16 -0700 (PDT) Date: Fri, 07 Aug 2020 05:19:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000105ec205ac489d59@google.com> Subject: KASAN: use-after-free Read in service_outstanding_interrupt From: syzbot To: andreyknvl@google.com, gregkh@linuxfoundation.org, gustavoars@kernel.org, ingrassia@epigenesys.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com 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 Hello, syzbot found the following issue on: HEAD commit: 7b4ea945 Revert "x86/mm/64: Do not sync vmalloc/ioremap ma.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=108adf32900000 kernel config: https://syzkaller.appspot.com/x/.config?x=72a84c46d0c668c dashboard link: https://syzkaller.appspot.com/bug?extid=9e04e2df4a32fb661daf compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9e04e2df4a32fb661daf@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in usb_submit_urb+0x10c4/0x13e0 drivers/usb/core/urb.c:368 Read of size 4 at addr ffff8881caa52018 by task syz-executor.3/13922 CPU: 1 PID: 13922 Comm: syz-executor.3 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf6/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x1a/0x210 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x37/0x7c mm/kasan/report.c:530 usb_submit_urb+0x10c4/0x13e0 drivers/usb/core/urb.c:368 service_outstanding_interrupt.part.0+0x5f/0xa0 drivers/usb/class/cdc-wdm.c:463 service_outstanding_interrupt drivers/usb/class/cdc-wdm.c:458 [inline] wdm_read+0x9a0/0xbd0 drivers/usb/class/cdc-wdm.c:576 vfs_read+0x1df/0x520 fs/read_write.c:479 ksys_read+0x12d/0x250 fs/read_write.c:607 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ce79 Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8d2099fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000000252c0 RCX: 000000000045ce79 RDX: 00000000000000f2 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffd66f595ff R14: 00007f8d209a09c0 R15: 000000000118bf2c Allocated by task 4524: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] usb_alloc_dev+0x51/0xf67 drivers/usb/core/usb.c:582 hub_port_connect drivers/usb/core/hub.c:5114 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1dff/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 5477: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x116/0x160 mm/kasan/common.c:455 slab_free_hook mm/slub.c:1474 [inline] slab_free_freelist_hook+0x53/0x140 mm/slub.c:1507 slab_free mm/slub.c:3072 [inline] kfree+0xbc/0x2c0 mm/slub.c:4052 device_release+0x71/0x200 drivers/base/core.c:1800 kobject_cleanup lib/kobject.c:704 [inline] kobject_release lib/kobject.c:735 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:752 put_device+0x1b/0x30 drivers/base/core.c:3029 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8881caa52000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 24 bytes inside of 2048-byte region [ffff8881caa52000, ffff8881caa52800) The buggy address belongs to the page: page:ffffea00072a9400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00072a9400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 0000000000000000 0000000100000001 ffff8881da00c000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881caa51f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881caa51f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881caa52000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881caa52080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881caa52100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.