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Sun, 13 Dec 2020 03:13:13 -0800 (PST) Date: Sun, 13 Dec 2020 03:13:13 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000094184905b6569cdd@google.com> Subject: UBSAN: shift-out-of-bounds 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: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a9e26cb5 Add linux-next specific files for 20201208 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1752cf17500000 kernel config: https://syzkaller.appspot.com/x/.config?x=e259434a8eaf0206 dashboard link: https://syzkaller.appspot.com/bug?extid=96523fb438937cd01220 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16edd00f500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b72237500000 The issue was bisected to: commit 71921690f9745fef60a2bad425f30adf8cdc9da0 Author: Michal Kubecek Date: Fri Dec 27 14:55:43 2019 +0000 ethtool: provide string sets with STRSET_GET request bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=108cd433500000 final oops: https://syzkaller.appspot.com/x/report.txt?x=128cd433500000 console output: https://syzkaller.appspot.com/x/log.txt?x=148cd433500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+96523fb438937cd01220@syzkaller.appspotmail.com Fixes: 71921690f974 ("ethtool: provide string sets with STRSET_GET request") ================================================================================ UBSAN: shift-out-of-bounds in net/ethtool/strset.c:191:28 shift exponent 3476603555 is too large for 32-bit type 'unsigned int' CPU: 1 PID: 8488 Comm: syz-executor226 Not tainted 5.10.0-rc7-next-20201208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 strset_parse_request.cold+0x3b/0x40 net/ethtool/strset.c:191 ethnl_default_parse+0xda/0x130 net/ethtool/netlink.c:282 ethnl_default_start+0x21c/0x570 net/ethtool/netlink.c:501 genl_start+0x3cc/0x670 net/netlink/genetlink.c:604 __netlink_dump_start+0x5a7/0x920 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+0x43c/0x590 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 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+0x907/0xe40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4409d9 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:00007ffc89faeb48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004409d9 RDX: 0000000000000000 RSI: 0000000020000fc0 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 000000000000000c R09: 00000000004002c8 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401fc0 R13: 0000000000402050 R14: 0000000000000000 R15: 0000000000000000 ================================================================================ --- This report 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 issue. 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 issue, for details see: https://goo.gl/tpsmEJ#testing-patches