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_PASS,URIBL_BLOCKED autolearn=ham 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 00D7BECDFB3 for ; Mon, 16 Jul 2018 14:59:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B148E208E9 for ; Mon, 16 Jul 2018 14:59:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B148E208E9 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-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by 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AOUpUlELJHFSoYWD6c/IZZFqhIN08uWM3Qejhv+TqVDY9OKCP+UR1zUJ XygwkLQo8Xf7up+FUCBeLTvzALJucAeOt3tfs2TnLrh1PAbg X-Google-Smtp-Source: AAOMgpf2/4e0uVfMBLoNVSdwBKZ++gPr8rmTZDggCO8Vcf6wxCDecz4pMdJ1+hBKqhGiFz3Kcr3MsckDS9sXQEANR4dIdY3AStws MIME-Version: 1.0 X-Received: by 2002:a6b:3384:: with SMTP id z126-v6mr7564528ioz.61.1531753143182; Mon, 16 Jul 2018 07:59:03 -0700 (PDT) Date: Mon, 16 Jul 2018 07:59:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000fbad1405711f113c@google.com> Subject: KASAN: use-after-free Read in kernel_accept From: syzbot To: davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, 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: 6bed5e260709 Merge branch 'fix-DCTCP-delayed-ACK' git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=176b25d0400000 kernel config: https://syzkaller.appspot.com/x/.config?x=b88de6eac8694da6 dashboard link: https://syzkaller.appspot.com/bug?extid=0bf2e01269f1274b4b03 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=159dd178400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13b76d62400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0bf2e01269f1274b4b03@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in kernel_accept+0x2a4/0x310 net/socket.c:3251 Read of size 8 at addr ffff8801a772c5e8 by task kworker/1:3/4569 CPU: 1 PID: 4569 Comm: kworker/1:3 Not tainted 4.18.0-rc3+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events smc_tcp_listen_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 kernel_accept+0x2a4/0x310 net/socket.c:3251 smc_clcsock_accept net/smc/af_smc.c:701 [inline] smc_tcp_listen_work+0x222/0xef0 net/smc/af_smc.c:1114 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Allocated by task 4568: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 sock_alloc_inode+0x78/0x320 net/socket.c:243 alloc_inode+0x63/0x190 fs/inode.c:210 new_inode_pseudo+0x71/0x1a0 fs/inode.c:895 sock_alloc+0x41/0x270 net/socket.c:567 __sock_create+0x175/0x940 net/socket.c:1250 sock_create_kern+0x3b/0x50 net/socket.c:1332 smc_create+0x141/0x360 net/smc/af_smc.c:1701 __sock_create+0x53c/0x940 net/socket.c:1286 sock_create net/socket.c:1326 [inline] __sys_socket+0x106/0x260 net/socket.c:1356 __do_sys_socket net/socket.c:1365 [inline] __se_sys_socket net/socket.c:1363 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1363 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4568: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 sock_destroy_inode+0x56/0x70 net/socket.c:273 destroy_inode+0x159/0x200 fs/inode.c:267 evict+0x5d5/0x990 fs/inode.c:575 iput_final fs/inode.c:1506 [inline] iput+0x635/0xaa0 fs/inode.c:1532 __sock_release+0x1f1/0x260 net/socket.c:610 sock_release+0x17/0x20 net/socket.c:618 smc_release+0x1a8/0x720 net/smc/af_smc.c:146 __sock_release+0xd7/0x260 net/socket.c:599 sock_close+0x19/0x20 net/socket.c:1150 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801a772c5c0 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 40 bytes inside of 992-byte region [ffff8801a772c5c0, ffff8801a772c9a0) The buggy address belongs to the page: page:ffffea00069dcb00 count:1 mapcount:0 mapping:ffff8801d9be93c0 index:0xffff8801a772cffd flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00069dcac8 ffffea00069dd408 ffff8801d9be93c0 raw: ffff8801a772cffd ffff8801a772c140 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a772c480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801a772c500: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801a772c580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801a772c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a772c680: 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches