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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 B9FCBC32792 for ; Thu, 3 Oct 2019 06:18:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A3B2222C4 for ; Thu, 3 Oct 2019 06:18:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726811AbfJCGSI (ORCPT ); Thu, 3 Oct 2019 02:18:08 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:40313 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725879AbfJCGSI (ORCPT ); Thu, 3 Oct 2019 02:18:08 -0400 Received: by mail-io1-f72.google.com with SMTP id r20so3559837ioh.7 for ; Wed, 02 Oct 2019 23:18:07 -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=gBSQkU41ZLVR6bUYLDQYs/WhgJL7Xhhm/K97Y0QyX7E=; b=CnDNALkwFz4ULU4YX/YGBog9hPrN6JaQweywWtaDfQxMHAVw56hohELEAwLnlmNXYu o5CokrNaivJXej4/ABsxHQx7LVHFtuYvpgT9MtrbFEhIcuRW2h4XStLyPI+2WoywxXYu ZOu2o22V1uqjOn2LRi+FwZtbZbbhdJ10gcPnIAqqsSlkhzveQrauXEhklbOF6skFuAdy 0B84/FyNATMctf2lhdL3q8toY8C3aldJhoo3jN26CCDOfLrlskddWJlS5eX5aiY9k8ym eMy+/TQT4NZPclNOcIQlw/ZX8UgTNwYuPSjPkR5kulOM8mxXK3SpvOFKsQW+C1IUKsb3 RKqA== X-Gm-Message-State: APjAAAUxGq+wFHlHFPD6XZ4ePmkX8QC7v7v1F95rrJ6Nfwr7vGFuGUcg y4K4/F9QFNj+2s4ZOwpB64bZhNsHkDBJYr81naL6fy6HqAVK X-Google-Smtp-Source: APXvYqyPWsGmsYzObJIZ/MF2L7Heo9bZifiycB3TxiMa7aWNjl+XOaK6BJwyXu6fx7wFW6GAnxH7ZgGG9qebcGQrUaRJ34hGrI0T MIME-Version: 1.0 X-Received: by 2002:a02:1cc5:: with SMTP id c188mr8051949jac.26.1570083487128; Wed, 02 Oct 2019 23:18:07 -0700 (PDT) Date: Wed, 02 Oct 2019 23:18:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000084a5a10593fb8c3f@google.com> Subject: KASAN: use-after-free Read in rds_inc_put 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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: a32db7e1 Add linux-next specific files for 20191002 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10ff857b600000 kernel config: https://syzkaller.appspot.com/x/.config?x=599cf05035799eef dashboard link: https://syzkaller.appspot.com/bug?extid=322126673a98080e677f 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+322126673a98080e677f@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in rds_inc_put+0x141/0x150 net/rds/recv.c:82 Read of size 8 at addr ffff88806f5371b0 by task syz-executor.0/18418 CPU: 1 PID: 18418 Comm: syz-executor.0 Not tainted 5.4.0-rc1-next-20191002 #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+0x172/0x1f0 lib/dump_stack.c:113 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:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 rds_inc_put+0x141/0x150 net/rds/recv.c:82 rds_clear_recv_queue+0x157/0x380 net/rds/recv.c:770 rds_release+0x117/0x3d0 net/rds/af_rds.c:73 __sock_release+0xce/0x280 net/socket.c:591 sock_close+0x1e/0x30 net/socket.c:1269 __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+0x904/0x2e60 kernel/exit.c:817 do_group_exit+0x135/0x360 kernel/exit.c:921 get_signal+0x47c/0x2500 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:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 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:00007f4088663cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffe10e1ad8f R14: 00007f40886649c0 R15: 000000000075bf2c Allocated by task 12004: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:518 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 kmem_cache_zalloc include/linux/slab.h:680 [inline] __rds_conn_create+0x63f/0x20b0 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:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 __sys_sendto+0x262/0x380 net/socket.c:1953 __do_sys_sendto net/socket.c:1965 [inline] __se_sys_sendto net/socket.c:1961 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1961 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9330: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3693 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+0xaa/0x150 net/core/net_namespace.c:172 cleanup_net+0x4e2/0xa60 net/core/net_namespace.c:594 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 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 ffff88806f537168 which belongs to the cache rds_connection of size 232 The buggy address is located 72 bytes inside of 232-byte region [ffff88806f537168, ffff88806f537250) The buggy address belongs to the page: page:ffffea0001bd4dc0 refcount:1 mapcount:0 mapping:ffff88809bcbd1c0 index:0xffff88806f537608 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffff88809bcfb338 ffffea00026b0248 ffff88809bcbd1c0 raw: ffff88806f537608 ffff88806f537040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806f537080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806f537100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fb fb fb > ffff88806f537180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f537200: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff88806f537280: fc fc 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.