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 7C84DC33CAF for ; Wed, 22 Jan 2020 06:57:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 51AD52465B for ; Wed, 22 Jan 2020 06:57:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728900AbgAVG5K (ORCPT ); Wed, 22 Jan 2020 01:57:10 -0500 Received: from mail-il1-f198.google.com ([209.85.166.198]:56408 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP 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X-Received: by 2002:a92:5cda:: with SMTP id d87mr7193909ilg.100.1579676228655; Tue, 21 Jan 2020 22:57:08 -0800 (PST) Date: Tue, 21 Jan 2020 22:57:08 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000078224f059cb50887@google.com> Subject: KASAN: slab-out-of-bounds Read in nla_put_nohdr From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d13879e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153 dashboard link: https://syzkaller.appspot.com/bug?extid=2f07903a5b05e7f36410 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17736bd1e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b67369e00000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=138c726ee00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=104c726ee00000 console output: https://syzkaller.appspot.com/x/log.txt?x=178c726ee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2f07903a5b05e7f36410@syzkaller.appspotmail.com IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: slab-out-of-bounds in __nla_put_nohdr lib/nlattr.c:815 [inline] BUG: KASAN: slab-out-of-bounds in nla_put_nohdr+0x100/0x180 lib/nlattr.c:881 Read of size 12 at addr ffff888095542c40 by task syz-executor859/9230 CPU: 0 PID: 9230 Comm: syz-executor859 Not tainted 5.5.0-rc7-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+0x1fb/0x318 lib/dump_stack.c:118 print_address_description+0x74/0x5c0 mm/kasan/report.c:374 __kasan_report+0x149/0x1c0 mm/kasan/report.c:506 kasan_report+0x26/0x50 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:182 [inline] check_memory_region+0x2b6/0x2f0 mm/kasan/generic.c:192 memcpy+0x28/0x60 mm/kasan/common.c:125 __nla_put_nohdr lib/nlattr.c:815 [inline] nla_put_nohdr+0x100/0x180 lib/nlattr.c:881 tcf_em_tree_dump+0x4c6/0x940 net/sched/ematch.c:471 basic_dump+0x44e/0x690 net/sched/cls_basic.c:308 tcf_fill_node+0x4f5/0x8a0 net/sched/cls_api.c:1814 tfilter_notify net/sched/cls_api.c:1840 [inline] tc_new_tfilter+0x1b73/0x2f70 net/sched/cls_api.c:2108 rtnetlink_rcv_msg+0x8fb/0xd40 net/core/rtnetlink.c:5415 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5442 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440dd9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff09724008 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004a25b0 RCX: 0000000000440dd9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000006cc018 R08: 0000000120080522 R09: 0000000120080522 R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004022e0 R13: 0000000000402370 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9230: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:513 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc_track_caller+0x253/0x340 mm/slab.c:3671 kmemdup+0x24/0x50 mm/util.c:127 em_nbyte_change+0xb7/0x120 net/sched/em_nbyte.c:32 tcf_em_validate net/sched/ematch.c:241 [inline] tcf_em_tree_validate+0x6b2/0x1020 net/sched/ematch.c:359 basic_set_parms net/sched/cls_basic.c:157 [inline] basic_change+0x5c8/0x1280 net/sched/cls_basic.c:219 tc_new_tfilter+0x1490/0x2f70 net/sched/cls_api.c:2104 rtnetlink_rcv_msg+0x8fb/0xd40 net/core/rtnetlink.c:5415 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5442 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8926: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10d/0x220 mm/slab.c:3757 tomoyo_check_open_permission+0x79c/0x9d0 security/tomoyo/file.c:786 tomoyo_file_open+0x141/0x190 security/tomoyo/tomoyo.c:319 security_file_open+0x50/0x2e0 security/security.c:1497 do_dentry_open+0x351/0x10c0 fs/open.c:784 vfs_open+0x73/0x80 fs/open.c:914 do_last fs/namei.c:3356 [inline] path_openat+0x1367/0x4250 fs/namei.c:3473 do_filp_open+0x192/0x3d0 fs/namei.c:3503 do_sys_open+0x29f/0x560 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x87/0x90 fs/open.c:1110 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888095542c40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff888095542c40, ffff888095542c60) The buggy address belongs to the page: page:ffffea0002555080 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff888095542fc1 raw: 00fffe0000000200 ffffea00029f8708 ffffea00029c1a48 ffff8880aa8001c0 raw: ffff888095542fc1 ffff888095542000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888095542b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff888095542b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff888095542c00: 00 00 01 fc fc fc fc fc 04 fc fc fc fc fc fc fc ^ ffff888095542c80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc ffff888095542d00: fb fb fb fb fc fc fc fc 00 00 fc fc 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#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches