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 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 E089FC6786E for ; Fri, 26 Oct 2018 16:38:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 97A692075D for ; Fri, 26 Oct 2018 16:38:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 97A692075D 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 vger.kernel.org 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AGRZ1gLL2RaMV2IBnvMchxeBtFejdc815Fm0s/VXfUO0Wea9eN5LILz0 9NHElNhMkQCdD6FfxoY/S1PpCeTyfqaaxOb5UyNTJ3v3+mLC X-Google-Smtp-Source: AJdET5fevZL0qFcHxRD7S9TJg1goI0YQFbXwzsbD2mHfF60iPO4JoV/gX3eZnF+D8WdjTNs6Gvrucl8YobmRlczU471kXwSXrBJr MIME-Version: 1.0 X-Received: by 2002:a05:660c:145:: with SMTP id r5mr3113868itk.25.1540571884158; Fri, 26 Oct 2018 09:38:04 -0700 (PDT) Date: Fri, 26 Oct 2018 09:38:04 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e80c930579245751@google.com> Subject: KASAN: slab-out-of-bounds Read in sctp_getsockopt From: syzbot To: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, vyasevich@gmail.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: bd6bf7c10484 Merge tag 'pci-v4.20-changes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16fd6bcb400000 kernel config: https://syzkaller.appspot.com/x/.config?x=2dd8629d56664133 dashboard link: https://syzkaller.appspot.com/bug?extid=5da0d0a72a9e7d791748 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b3ea33400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17f9f1bd400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5da0d0a72a9e7d791748@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline] BUG: KASAN: slab-out-of-bounds in sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582 Read of size 8 at addr ffff8801d89f0968 by task syz-executor278/5330 CPU: 1 PID: 5330 Comm: syz-executor278 Not tainted 4.19.0+ #303 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline] sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2937 __sys_getsockopt+0x1ad/0x390 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt net/socket.c:1947 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1947 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445789 Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007effdb293db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000445789 RDX: 0000000000000074 RSI: 0000000000000084 RDI: 0000000000000003 RBP: 00000000006dac40 R08: 0000000020000040 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000006dac4c R13: 00007ffcfc408c6f R14: 00007effdb2949c0 R15: 00000000006dad2c Allocated by task 5329: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] sctp_stream_init_ext+0x4f/0xf0 net/sctp/stream.c:237 sctp_sendmsg_to_asoc+0x1308/0x1a20 net/sctp/socket.c:1896 sctp_sendmsg+0x13c2/0x1da0 net/sctp/socket.c:2113 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3223: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 kzfree+0x28/0x30 mm/slab_common.c:1543 aa_free_file_ctx security/apparmor/include/file.h:76 [inline] apparmor_file_free_security+0x133/0x1a0 security/apparmor/lsm.c:448 security_file_free+0x4a/0x80 security/security.c:900 file_free fs/file_table.c:54 [inline] __fput+0x4e8/0xa30 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 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 ffff8801d89f0900 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 8 bytes to the right of 96-byte region [ffff8801d89f0900, ffff8801d89f0960) The buggy address belongs to the page: page:ffffea0007627c00 count:1 mapcount:0 mapping:ffff8801da8004c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007646748 ffffea0007613488 ffff8801da8004c0 raw: 0000000000000000 ffff8801d89f0000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d89f0800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801d89f0880: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc > ffff8801d89f0900: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ^ ffff8801d89f0980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801d89f0a00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== --- 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