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=-0.6 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 83925C04EB8 for ; Mon, 10 Dec 2018 07:49:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 487232081F for ; Mon, 10 Dec 2018 07:49:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 487232081F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-block-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726519AbeLJHtF (ORCPT ); Mon, 10 Dec 2018 02:49:05 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:56541 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726218AbeLJHtE (ORCPT ); Mon, 10 Dec 2018 02:49:04 -0500 Received: by mail-it1-f200.google.com with SMTP id x3so12886856itb.6 for ; Sun, 09 Dec 2018 23:49:03 -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=fskeLgDIlTWoRRDITccqr/L2+yuEhPN362olBBjX+KM=; b=EpUJkzmht3rxeAfcTBWejksBUiZFuE4Sd8r2HRx9h2AlR+ZygkK1Xc5R2cOGci7dQY AZ8Du2SPdvV9B8CLDIjrcGmaUmyRb9ay5FOg1LHsld+V5QDTHPK1phaaHvIfP+y5CAs8 IhHGvPMrE4QznzjknBnClQq+mt5B3cdafQT+uq6Ws1A7lXnhqQ6/Q2Nr3LV3gfUgAkoi ukfo8ZOIvMbMA7HtKCaDQCHhlbJhUXJIUFaXKT208lo9Prqj/CxKod8LvwA4W3UkKMjM X0XwH8+y1ItRatJExe1vGgxOUZcK3cIwevYCceC6h5gMC0k/2ONALdTnffHuPfDSbTRP aKeA== X-Gm-Message-State: AA+aEWaLu/Vs8PYdfTsi5SWupKdnB6G7IJi/tdT8ikMTngFr2M5txBYz S0yKQw+CBYKeAyRWFNptsclfCzLXMDvChOr5HgETENEPCtIA X-Google-Smtp-Source: AFSGD/WxQ9vIH4JqYOTS2Ugv1CsNBjK4E5rI6kKzdZQwP5lS+AAeKdWCyeozSbmijpgpoexr2DEbkzz4ioBnyxO57aM5Yh5X4W4i MIME-Version: 1.0 X-Received: by 2002:a02:4596:: with SMTP id o22mr9575456jad.12.1544428143007; Sun, 09 Dec 2018 23:49:03 -0800 (PST) Date: Sun, 09 Dec 2018 23:49:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d86774057ca63295@google.com> Subject: KASAN: use-after-free Read in get_disk_and_module From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 74c4a24df7ca Add linux-next specific files for 20181207 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=171e9125400000 kernel config: https://syzkaller.appspot.com/x/.config?x=6e9413388bf37bed dashboard link: https://syzkaller.appspot.com/bug?extid=b00e02299cdecb22b288 compiler: gcc (GCC) 8.0.1 20180413 (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+b00e02299cdecb22b288@syzkaller.appspotmail.com QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl __loop_clr_fd: partition scan of loop3 failed (rc=-22) ================================================================== BUG: KASAN: use-after-free in get_disk_and_module+0xd5/0xf0 block/genhd.c:1493 Read of size 8 at addr ffff8881b4f24f58 by task blkid/21934 CPU: 0 PID: 21934 Comm: blkid Not tainted 4.20.0-rc5-next-20181207+ #163 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.4+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.5+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 get_disk_and_module+0xd5/0xf0 block/genhd.c:1493 get_gendisk+0x17a/0x380 block/genhd.c:855 bdev_get_gendisk fs/block_dev.c:1092 [inline] __blkdev_get+0x467/0x13b0 fs/block_dev.c:1487 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe787296120 Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24 RSP: 002b:00007fffed985768 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe787296120 RDX: 00007fffed987f1f RSI: 0000000000000000 RDI: 00007fffed987f1f RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000939030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 Allocated by task 21892: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482 kmem_cache_alloc_node_trace+0x14f/0x740 mm/slab.c:3650 kmalloc_node include/linux/slab.h:583 [inline] kzalloc_node include/linux/slab.h:751 [inline] __alloc_disk_node+0xc9/0x510 block/genhd.c:1446 loop_add+0x453/0xa20 drivers/block/loop.c:1935 loop_probe+0x18d/0x1d0 drivers/block/loop.c:2041 kobj_lookup+0x264/0x460 drivers/base/map.c:124 get_gendisk+0x4c/0x380 block/genhd.c:847 bdev_get_gendisk fs/block_dev.c:1092 [inline] __blkdev_get+0x467/0x13b0 fs/block_dev.c:1487 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21924: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kfree+0xcf/0x230 mm/slab.c:3804 disk_release+0x1f2/0x250 block/genhd.c:1304 device_release+0x7e/0x210 drivers/base/core.c:919 kobject_cleanup lib/kobject.c:662 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold.9+0x287/0x2e4 lib/kobject.c:708 put_disk+0x23/0x30 block/genhd.c:1511 loop_remove+0x92/0xc0 drivers/block/loop.c:1990 loop_control_ioctl+0x3f2/0x480 drivers/block/loop.c:2086 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881b4f249c0 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1432 bytes inside of 2048-byte region [ffff8881b4f249c0, ffff8881b4f251c0) The buggy address belongs to the page: page:ffffea0006d3c900 count:1 mapcount:0 mapping:ffff8881da800c40 index:0xffff8881b4f25240 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000707b388 ffffea00075d4688 ffff8881da800c40 raw: ffff8881b4f25240 ffff8881b4f24140 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881b4f24e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b4f24e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881b4f24f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881b4f24f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b4f25000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. 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