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 C5987C32771 for ; Wed, 15 Jan 2020 17:09:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9F3982465A for ; Wed, 15 Jan 2020 17:09:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729033AbgAORJN (ORCPT ); Wed, 15 Jan 2020 12:09:13 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:32820 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728982AbgAORJN (ORCPT ); Wed, 15 Jan 2020 12:09:13 -0500 Received: by mail-il1-f197.google.com with SMTP id s9so13813036ilk.0 for ; Wed, 15 Jan 2020 09:09:12 -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=Qbzb5A9NTIdexzU3+GDyxXanOmczlUCSWJ+llDlUeKE=; b=KNalGGaT55fV+NFRwwyQp8cXyKhkZRTw7M7fQBNrrRd725bLjngjGddrzscC9aUG93 nMG7ympYaD26i/IXjHoDny89kZl2WMO66rkOZUGFDVx2hVZVAl+48FKU2YrSSzjtulWo Bx7I7PqkXAq5uJdg6JF8T01QVGWW6IDgbmz49ecI4sCW7Qbh7RADFGDup3p2BvNhlOHd 0aE/qg61S5stuGSR3tKUT/JUeFqV3uWdu2nrtNYMzyJnIy9IOFTcqQbnxFdl9n9rXISP HkrxAlAkTGjRuQd4ue+AHqer/5kxhkjDQImfEug17MNmLO5cpJ5zcOCUNwH/jlcvPgT4 r29g== X-Gm-Message-State: APjAAAV4Fp5rrOGPPg3zO2enEJIdgC9O4t8caLciJUYOoqS/G+X6Kvzt 4RQUwioP7xpNi1GH8Qqy/JmBrS1MkrfR5DQhkOB7u6yF5Glh X-Google-Smtp-Source: APXvYqzgkin2QCBDKr+TM7mcvH98bIkCbsyiNGMto6b1TNj7A+Aq/twS6IkaV5fRkY2Wzhc/j9ccf9Q1q6yftx8JhzxOKT0o2ns9 MIME-Version: 1.0 X-Received: by 2002:a02:2446:: with SMTP id q6mr23887453jae.78.1579108152572; Wed, 15 Jan 2020 09:09:12 -0800 (PST) Date: Wed, 15 Jan 2020 09:09:12 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007f03ed059c30c4a0@google.com> Subject: KASAN: use-after-free Read in rds_inc_put (2) From: syzbot To: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, rds-devel@oss.oracle.com, santosh.shilimkar@oracle.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 95e20af9 Merge tag 'nfs-for-5.5-2' of git://git.linux-nfs... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=119575e1e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4 dashboard link: https://syzkaller.appspot.com/bug?extid=8a25042506b5a9f010cd compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 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+8a25042506b5a9f010cd@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in rds_inc_put+0x19e/0x1b0 net/rds/recv.c:82 Read of size 8 at addr ffff8880a8dd6650 by task syz-executor.5/9920 CPU: 1 PID: 9920 Comm: syz-executor.5 Not tainted 5.5.0-rc6-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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 rds_inc_put+0x19e/0x1b0 net/rds/recv.c:82 rds_clear_recv_queue+0x157/0x380 net/rds/recv.c:770 rds_release+0x117/0x430 net/rds/af_rds.c:73 __sock_release+0xce/0x280 net/socket.c:592 sock_close+0x1e/0x30 net/socket.c:1270 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xba9/0x2f50 kernel/exit.c:801 do_group_exit+0x135/0x360 kernel/exit.c:899 get_signal+0x47c/0x24f0 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:352 [inline] do_fast_syscall_32+0xbbd/0xe16 arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f49a39 Code: Bad RIP value. RSP: 002b:00000000f5d2412c EFLAGS: 00000292 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 000000000817aff8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000817affc RBP: 00000000f5d24228 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 25007: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:660 [inline] __rds_conn_create+0x63a/0x20a0 net/rds/connection.c:193 rds_conn_create_outgoing+0x4b/0x60 net/rds/connection.c:351 rds_sendmsg+0x19a4/0x35b0 net/rds/send.c:1294 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:659 ____sys_sendmsg+0x753/0x880 net/socket.c:2330 ___sys_sendmsg+0x100/0x170 net/socket.c:2384 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417 __compat_sys_sendmsg net/compat.c:642 [inline] __do_compat_sys_sendmsg net/compat.c:649 [inline] __se_compat_sys_sendmsg net/compat.c:646 [inline] __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:646 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 72: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3694 rds_conn_destroy+0x61f/0x880 net/rds/connection.c:501 rds_loop_kill_conns net/rds/loop.c:213 [inline] rds_loop_exit_net+0x2fc/0x4a0 net/rds/loop.c:219 ops_exit_list.isra.0+0xb1/0x160 net/core/net_namespace.c:172 cleanup_net+0x538/0xaf0 net/core/net_namespace.c:597 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a8dd6608 which belongs to the cache rds_connection of size 232 The buggy address is located 72 bytes inside of 232-byte region [ffff8880a8dd6608, ffff8880a8dd66f0) The buggy address belongs to the page: page:ffffea0002a37580 refcount:1 mapcount:0 mapping:ffff8880a8eec380 index:0xffff8880a8dd6e20 raw: 00fffe0000000200 ffff8880a86c8938 ffffea000292e348 ffff8880a8eec380 raw: ffff8880a8dd6e20 ffff8880a8dd6040 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8dd6500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a8dd6580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc > ffff8880a8dd6600: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8dd6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff8880a8dd6700: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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.