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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 F0E0BC43387 for ; Fri, 4 Jan 2019 16:37:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF04D21874 for ; Fri, 4 Jan 2019 16:37:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726415AbfADQhT (ORCPT ); Fri, 4 Jan 2019 11:37:19 -0500 Received: from mail-it1-f198.google.com ([209.85.166.198]:39939 "EHLO mail-it1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726285AbfADQhF (ORCPT ); Fri, 4 Jan 2019 11:37:05 -0500 Received: by mail-it1-f198.google.com with SMTP id 135so1508489itk.5 for ; Fri, 04 Jan 2019 08:37:04 -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=6CPda2rd/Ei4ocRTxtuDKDu4e5pMW8qjwG6/bGMCGnk=; b=rfCSTQ4BcCLuXYb0KJH7YCYYqVj3im5ykcfalYVZOBcL9uj9O5oKW1IQ2RQpSZSADg rssqE3fCeoJ9p6k03rYoa54ZloJ/PFTO6/5cxN6ZFsw5djSkn0lP/hRn3yW5X0dd2FIv YjOCuYG4j21GYvTY+e2ynG+q0uYdNIPtJywvd6QqSqtaxgH3xwVUi3hwYf1grTRObaNu rfDXjNJ+TQ44DwqS1u4GGnkVxBcSxwK6YVkEAxkjolOpKBZR89aSmn/PWgsqgSdX2D41 dYT5lbzfIbHP9MoXVNgzWcuhvkTqWaxSyXsr37sxwauqnFtQ3wnc0/HTyDzPq8SFatfx 8ZGQ== X-Gm-Message-State: AA+aEWbKFcG8XIuWjacr6dqowVfWHag6O4Nw0sT1pkXM/GD6eH0xAPUT s2SfFESKZolY74JzBkxBCMJ9rk3mF0sU9K5IJ09dUOYJkdnU X-Google-Smtp-Source: AFSGD/W172ZC12HkzPJI8Avl0pLhTftGmCSRqKui8bUdfLr7TLXywscu15Dq1TYdY8UQZPnRcJP96Mg4kleH5TxYpwG9TLFQ/U4K MIME-Version: 1.0 X-Received: by 2002:a02:c90a:: with SMTP id t10mr40863479jao.19.1546619824110; Fri, 04 Jan 2019 08:37:04 -0800 (PST) Date: Fri, 04 Jan 2019 08:37:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003804ff057ea47d37@google.com> Subject: KASAN: use-after-free Read in disk_map_sector_rcu 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: 645ff1e8e704 Merge branch 'for-linus' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14bb39ab400000 kernel config: https://syzkaller.appspot.com/x/.config?x=7308e68273924137 dashboard link: https://syzkaller.appspot.com/bug?extid=e01322aeded15e015bbd 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+e01322aeded15e015bbd@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in sector_in_part block/genhd.c:260 [inline] BUG: KASAN: use-after-free in disk_map_sector_rcu+0x6a6/0x6d0 block/genhd.c:288 Read of size 8 at addr ffff88808b32d640 by task blkid/2241 CPU: 0 PID: 2241 Comm: blkid Not tainted 4.20.0+ #8 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 sector_in_part block/genhd.c:260 [inline] disk_map_sector_rcu+0x6a6/0x6d0 block/genhd.c:288 blk_account_io_start+0x54a/0x1000 block/blk-core.c:1360 blk_mq_bio_to_request block/blk-mq.c:1749 [inline] blk_mq_make_request+0x7ac/0x1e10 block/blk-mq.c:1962 generic_make_request+0x902/0x17f0 block/blk-core.c:1087 submit_bio+0xba/0x480 block/blk-core.c:1195 mpage_bio_submit fs/mpage.c:66 [inline] mpage_readpages+0x694/0x920 fs/mpage.c:410 blkdev_readpages+0x2d/0x40 fs/block_dev.c:601 read_pages+0x119/0x650 mm/readahead.c:123 __do_page_cache_readahead+0x5ce/0x800 mm/readahead.c:209 force_page_cache_readahead+0x1e9/0x360 mm/readahead.c:240 page_cache_sync_readahead mm/readahead.c:519 [inline] page_cache_sync_readahead+0x62a/0x6b0 mm/readahead.c:506 generic_file_buffered_read mm/filemap.c:2080 [inline] generic_file_read_iter+0x1a81/0x2d40 mm/filemap.c:2350 blkdev_read_iter+0x120/0x190 fs/block_dev.c:1959 call_read_iter include/linux/fs.h:1856 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x761/0xb20 fs/read_write.c:418 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd3fcbe0310 Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 RSP: 002b:00007ffcead735c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd3fcbe0310 RDX: 0000000000000400 RSI: 0000000001aedc58 RDI: 0000000000000003 RBP: 0000000001aedc30 R08: 0000000000000028 R09: 0000000001680000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001aed030 R13: 0000000000000400 R14: 0000000001aed080 R15: 0000000001aedc48 Allocated by task 2136: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3607 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] add_partition+0x1e9/0xf50 block/partition-generic.c:322 rescan_partitions+0x5c5/0x970 block/partition-generic.c:618 __blkdev_reread_part+0x1a2/0x230 block/ioctl.c:173 blkdev_reread_part+0x27/0x40 block/ioctl.c:193 loop_reread_partitions+0x1c/0x40 drivers/block/loop.c:633 loop_set_status+0xcf7/0x1100 drivers/block/loop.c:1268 loop_set_status64+0xc2/0x120 drivers/block/loop.c:1388 lo_ioctl+0x518/0x2190 drivers/block/loop.c:1514 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x10e0/0x2120 block/ioctl.c:605 block_ioctl+0xee/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8281: save_stack+0x45/0xd0 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 part_release+0xaa/0xd0 block/partition-generic.c:228 device_release+0x7d/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:67 [inline] kobject_put.cold+0x28f/0x2ec lib/kobject.c:708 put_device+0x20/0x30 drivers/base/core.c:2060 delete_partition_work_fn+0x14a/0x1b0 block/partition-generic.c:256 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88808b32d640 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff88808b32d640, ffff88808b32de40) The buggy address belongs to the page: page:ffffea00022ccb00 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002153f88 ffffea00011d8588 ffff88812c3f0c40 raw: 0000000000000000 ffff88808b32c540 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808b32d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808b32d580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff88808b32d600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88808b32d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808b32d700: 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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