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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 3A49DC4363A for ; Thu, 8 Oct 2020 15:00:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFA8321789 for ; Thu, 8 Oct 2020 15:00:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730799AbgJHPAW (ORCPT ); Thu, 8 Oct 2020 11:00:22 -0400 Received: from mail-io1-f78.google.com ([209.85.166.78]:47881 "EHLO mail-io1-f78.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a05:6e02:8b3:: with SMTP id a19mr6931279ilt.174.1602169220321; Thu, 08 Oct 2020 08:00:20 -0700 (PDT) Date: Thu, 08 Oct 2020 08:00:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003f57e905b12a17b5@google.com> Subject: KASAN: slab-out-of-bounds Read in strset_parse_request From: syzbot To: andrew@lunn.ch, davem@davemloft.net, f.fainelli@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 9faebeb2 Merge branch 'ethtool-allow-dumping-policies-to-u.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=15f7dc00500000 kernel config: https://syzkaller.appspot.com/x/.config?x=8ad9ecfafd94317b dashboard link: https://syzkaller.appspot.com/bug?extid=9d1389df89299fa368dc compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d9b94f900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105268bf900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9d1389df89299fa368dc@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in strset_parse_request+0x4dd/0x530 net/ethtool/strset.c:172 Read of size 8 at addr ffff8880a120be18 by task syz-executor483/6874 CPU: 1 PID: 6874 Comm: syz-executor483 Not tainted 5.9.0-rc8-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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 strset_parse_request+0x4dd/0x530 net/ethtool/strset.c:172 ethnl_default_parse+0xda/0x130 net/ethtool/netlink.c:282 ethnl_default_start+0x21f/0x510 net/ethtool/netlink.c:501 genl_start+0x3cc/0x670 net/netlink/genetlink.c:604 __netlink_dump_start+0x585/0x900 net/netlink/af_netlink.c:2363 genl_family_rcv_msg_dumpit+0x1c9/0x310 net/netlink/genetlink.c:697 genl_family_rcv_msg net/netlink/genetlink.c:780 [inline] genl_rcv_msg+0x434/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2489 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x440979 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 5b 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe892965e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440979 RDX: 0000000000000000 RSI: 0000000020000780 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000001 R09: 00000000004002c8 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000401f60 R13: 0000000000401ff0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6874: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3659 [inline] __kmalloc+0x1b0/0x360 mm/slab.c:3668 kmalloc_array include/linux/slab.h:594 [inline] genl_family_rcv_msg_attrs_parse.constprop.0+0xd7/0x280 net/netlink/genetlink.c:543 genl_start+0x187/0x670 net/netlink/genetlink.c:584 __netlink_dump_start+0x585/0x900 net/netlink/af_netlink.c:2363 genl_family_rcv_msg_dumpit+0x1c9/0x310 net/netlink/genetlink.c:697 genl_family_rcv_msg net/netlink/genetlink.c:780 [inline] genl_rcv_msg+0x434/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2489 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880a120be00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes inside of 32-byte region [ffff8880a120be00, ffff8880a120be20) The buggy address belongs to the page: page:000000007938d980 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a120bfc1 pfn:0xa120b flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002848c08 ffffea00027e6b48 ffff8880aa040100 raw: ffff8880a120bfc1 ffff8880a120b000 0000000100000011 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a120bd00: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff8880a120bd80: fb fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc >ffff8880a120be00: 00 00 00 fc fc fc fc fc 00 01 fc fc fc fc fc fc ^ ffff8880a120be80: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a120bf00: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc 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