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,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 7EA94C433FF for ; Thu, 8 Aug 2019 16:48:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 55AF421881 for ; Thu, 8 Aug 2019 16:48:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404098AbfHHQsG (ORCPT ); Thu, 8 Aug 2019 12:48:06 -0400 Received: from mail-ot1-f69.google.com ([209.85.210.69]:53834 "EHLO mail-ot1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732775AbfHHQsG (ORCPT ); Thu, 8 Aug 2019 12:48:06 -0400 Received: by mail-ot1-f69.google.com with SMTP id e42so1086317ote.20 for ; Thu, 08 Aug 2019 09:48:06 -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=aZTT0yWwCLvofMIk/vDC+UDU3g6pGvtYwgnyGAaloQg=; b=ufs9UcTbJQGiOT5cCGZrZvqKeeqz37U6jq6mDFeupAdpeeEYN5wjbibTr7VDiMh6PT UK82BCZYbbpNzCHWXjsBmpSd9Fnq/VRHafAny9ETiMsqosEWBjUOPjYqg1SOF1e80QZd f067PCAQkbZAzMiIZ0NlvlhSLZ/pfyCUrS2ZT86n5SS3nPon8nxG/7UUP6oyYciKfdfU nvhOUu8/r4FACUHqXgMEDSaxdOJPB/0+D90q/A0+fK9M4i9B96lpmoxu2wBi145pWQEs tytj2NSbe7l0wJtQJL6RFm0Mb+uuDjWpc+SSu0f0UeyAbCZj/BswvdlDzU6GhI1YlKHb lpTQ== X-Gm-Message-State: APjAAAWbZxpIGdnFmTwdIKKs2r6cGQxrr+wIZ/RIDeulJ7Do1HCVp1DU 1nt9AS3N86GZ/m22jjUNOG4P+wdB+DtvZBomMBTxfRt23NDF X-Google-Smtp-Source: APXvYqytw9HqCH1DBUw67wrUkqUU8fJEGDnt8vZR6W2gnl4+Ka54Jb73f78Rhe/UFgBE7w2DUO6m9ZbJFc8S+UCKUKlRtodfp82z MIME-Version: 1.0 X-Received: by 2002:a02:b713:: with SMTP id g19mr10752238jam.77.1565282885836; Thu, 08 Aug 2019 09:48:05 -0700 (PDT) Date: Thu, 08 Aug 2019 09:48:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000062292b058f9dd282@google.com> Subject: KASAN: use-after-free Read in __blkdev_direct_IO From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 629f8205 Merge tag 'for-linus-20190730' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13e50eb4600000 kernel config: https://syzkaller.appspot.com/x/.config?x=e397351d2615e10 dashboard link: https://syzkaller.appspot.com/bug?extid=a1fc36a4d12501564d34 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) 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+a1fc36a4d12501564d34@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __blkdev_direct_IO+0xb3d/0x1310 fs/block_dev.c:468 Read of size 4 at addr ffff888037bc2028 by task syz-executor.0/5655 CPU: 0 PID: 5655 Comm: syz-executor.0 Not tainted 5.3.0-rc2+ #56 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+0x1d8/0x2f8 lib/dump_stack.c:113 print_address_description+0x75/0x5b0 mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:482 kasan_report+0x26/0x50 mm/kasan/common.c:612 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 __blkdev_direct_IO+0xb3d/0x1310 fs/block_dev.c:468 blkdev_direct_IO+0xbe/0xd0 fs/block_dev.c:518 generic_file_direct_write+0x22e/0x440 mm/filemap.c:3230 __generic_file_write_iter+0x2af/0x520 mm/filemap.c:3413 blkdev_write_iter+0x2f2/0x420 fs/block_dev.c:1993 ? 0xffffffff81000000 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x617/0x7d0 fs/read_write.c:496 vfs_write+0x275/0x590 fs/read_write.c:558 ksys_write+0x16b/0x2a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:620 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f56f3b24c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 RDX: 0000000052698b21 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f56f3b256d4 R13: 00000000004c5db7 R14: 00000000004e00e0 R15: 00000000ffffffff Allocated by task 5655: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:487 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x1f5/0x2e0 mm/slab.c:3483 mempool_alloc_slab+0x4d/0x70 mm/mempool.c:513 mempool_alloc+0x15f/0x6c0 mm/mempool.c:393 bio_alloc_bioset+0x210/0x670 block/bio.c:477 bio_alloc include/linux/bio.h:400 [inline] __blkdev_direct_IO+0xa29/0x1310 fs/block_dev.c:470 blkdev_direct_IO+0xbe/0xd0 fs/block_dev.c:518 generic_file_direct_write+0x22e/0x440 mm/filemap.c:3230 __generic_file_write_iter+0x2af/0x520 mm/filemap.c:3413 blkdev_write_iter+0x2f2/0x420 fs/block_dev.c:1993 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x617/0x7d0 fs/read_write.c:496 vfs_write+0x275/0x590 fs/read_write.c:558 ksys_write+0x16b/0x2a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:620 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x81/0xf0 mm/slab.c:3693 mempool_free_slab+0x1d/0x30 mm/mempool.c:520 mempool_free+0xd5/0x350 mm/mempool.c:502 bio_put+0x35a/0x420 block/bio.c:253 blkdev_bio_end_io+0x336/0x430 fs/block_dev.c:333 bio_endio+0x4ff/0x570 block/bio.c:1830 req_bio_endio block/blk-core.c:239 [inline] blk_update_request+0x385/0xf80 block/blk-core.c:1424 blk_mq_end_request+0x42/0x80 block/blk-mq.c:557 blk_flush_complete_seq+0x5e1/0xd10 block/blk-flush.c:196 flush_end_io+0x4d2/0x670 block/blk-flush.c:237 __blk_mq_end_request+0x38a/0x410 block/blk-mq.c:548 blk_mq_end_request+0x55/0x80 block/blk-mq.c:559 lo_complete_rq+0x13b/0x270 drivers/block/loop.c:485 blk_done_softirq+0x362/0x3e0 block/blk-softirq.c:37 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 The buggy address belongs to the object at ffff888037bc2000 which belongs to the cache bio-0 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff888037bc2000, ffff888037bc20c0) The buggy address belongs to the page: page:ffffea0000def080 refcount:1 mapcount:0 mapping:ffff88821ac91540 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000167a2c8 ffffea0001e21ac8 ffff88821ac91540 raw: 0000000000000000 ffff888037bc2000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888037bc1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888037bc1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff888037bc2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888037bc2080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888037bc2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.