milabs / drop-tcp-sock Goto Github PK

OS:centOS7.5.1804

make: *** /lib/modules/3.10.0-86.el7.x86_64/build: no such file or directory . stop.
make: *** [default] errer 2

Привет.
Сабж в заголовке. После make:

/root/drop-tcp-sock/main.c:57:8: error: implicit declaration of function ‘inet6_lookup’; did you mean ‘inet_lookup’? [-Werror=implicit-function-declaration]
   sk = inet6_lookup(net, &tcp_hashinfo,

Как быть. Спасибо.

I'm not sure yet if this happens at the second write to /proc/net/tcpdropsock, or just to kill a lot of connections, or both at the same time.

Without much certainty I'd say dnew = krealloc is actually ignored as if dnew is a different pointer, it's not save back in i_private?

[ 792.277473] usercopy: kernel memory overwrite attempt detected to 0000000053b3152f (kmalloc-8192) (8192 bytes)
[ 792.277956] ------------[ cut here ]------------
[ 792.277956] kernel BUG at /build/linux-vxxS7y/linux-4.15.0/mm/usercopy.c:72!
[ 792.278401] invalid opcode: 0000 [#1] SMP NOPTI
[ 792.278840] Modules linked in: drop_tcp_sock(OE) ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs cpuid rpcsec_gss_krb5 auth_rpcgss nfsv4 msr nfs lockd grace fscache rdma_ucm(OE) ib_ucm(OE) ib_ipoib(OE) ib_uverbs(OE) ib_umad(OE) esp6_offload esp6 esp4_offload esp4 xfrm_algo mlx5_fpga_tools(OE) mlx4_en(OE) mlx4_ib(OE) mlx4_core(OE) intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel ipmi_ssif kvm irqbypass intel_cstate dcdbas intel_rapl_perf ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter mac_hid mei_me mei shpchp lpc_ich sch_fq_codel sunrpc rdma_cm(OE) iw_cm(OE) ib_cm(OE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1
[ 792.282388] raid0 multipath linear mlx5_ib(OE) mgag200 crct10dif_pclmul ib_core(OE) crc32_pclmul ttm ghash_clmulni_intel pcbc drm_kms_helper ixgbe syscopyarea igb mlx5_core(OE) aesni_intel sysfillrect mlxfw(OE) devlink sysimgblt aes_x86_64 dca mlx_compat(OE) fb_sys_fops i2c_algo_bit crypto_simd megaraid_sas ahci glue_helper ptp drm cryptd libahci mdio pps_core wmi
[ 792.284109] CPU: 10 PID: 10502 Comm: tee Tainted: G OE 4.15.0-43-generic #46-Ubuntu
[ 792.284700] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 1.0.4 08/28/2014
[ 792.285298] RIP: 0010:__check_object_size+0x123/0x1b0
[ 792.285890] RSP: 0018:ffffa688c720be28 EFLAGS: 00010282
[ 792.286478] RAX: 0000000000000062 RBX: 0000000000002000 RCX: 0000000000000006
[ 792.287072] RDX: 0000000000000000 RSI: 0000000000000096 RDI: ffff9006bfd56490
[ 792.287664] RBP: ffffa688c720be48 R08: 0000000000000000 R09: 00000000000005b6
[ 792.288258] R10: 0000000000002000 R11: 00000000ffffffff R12: 0000000000000000
[ 792.288848] R13: ffff8ffa4342a008 R14: ffff8ffa43428008 R15: ffff9006b8418c00
[ 792.289440] FS: 00007f067ecaa540(0000) GS:ffff9006bfd40000(0000) knlGS:0000000000000000
[ 792.290038] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 792.290637] CR2: 00007f067ecbd000 CR3: 00000003bf404006 CR4: 00000000001606e0
[ 792.291241] Call Trace:
[ 792.291844] dts_proc_write+0x53/0xd0 [drop_tcp_sock]
[ 792.292453] proc_reg_write+0x45/0x70
[ 792.293053] __vfs_write+0x1b/0x40
[ 792.293650] vfs_write+0xb1/0x1a0
[ 792.294241] SyS_write+0x55/0xc0
[ 792.294828] do_syscall_64+0x73/0x130
[ 792.295413] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 792.295996] RIP: 0033:0x7f067e7bb154
[ 792.296577] RSP: 002b:00007fff075b5aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 792.297169] RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00007f067e7bb154
[ 792.297767] RDX: 0000000000002000 RSI: 00007fff075b5b90 RDI: 0000000000000003
[ 792.298367] RBP: 00007fff075b5b90 R08: 0000000000002000 R09: 00007f067ecaa540
[ 792.298965] R10: 00000000000001b6 R11: 0000000000000246 R12: 00005606b2b00460
[ 792.299558] R13: 0000000000002000 R14: 00007f067ea92760 R15: 0000000000002000
[ 792.300150] Code: 48 0f 45 d1 48 c7 c6 93 ee 0d b5 48 c7 c1 3f fc 0e b5 48 0f 45 f1 49 89 d9 49 89 c0 4c 89 f1 48 c7 c7 48 fc 0e b5 e8 ed e0 e7 ff <0f> 0b f3 c3 48 8b 3d b2 1d 1a 01 48 8b 0d 43 9e 1d 01 be 00 00
[ 792.301396] RIP: __check_object_size+0x123/0x1b0 RSP: ffffa688c720be28
[ 792.302025] ---[ end trace c9aab99dea41e061 ]---

I added a little printk to show that the size of the "size" argument in ts_proc_write is 8192.

Hello milabs,

I am trying install your module. I am not linux guru.
This is my commands

cd
git clone https://github.com/milabs/drop-tcp-sock.git
cd drop*
make
insmod ./drop-tcp-sock.ko

I am getting this error.

make -C /lib/modules/4.15.0-29-generic/build M=$PWD
make[1]: *** /lib/modules/4.15.0-29-generic/build: No such file or directory. Stop.
Makefile:7: recipe for target 'all' failed
make: *** [all] Error 2

What can i do?

Thank You.

The following usage is missing the netstat -t switch:

netstat -n | grep WAIT | awk '{print $4"\t"$5}'

Should be:

netstat -t -n | grep WAIT | awk '{print $4"\t"$5}'

When using the module with a large amount of sockets, I eventually end up in soft lockup:

[93492.433061] Call Trace:
[93492.433061]  in4_pton+0x3f/0x160
[93492.433061]  dts_pton+0x3d/0xd0 [drop_tcp_sock]
[93492.433061]  dts_proc_release+0x143/0x360 [drop_tcp_sock]
[93492.433061]  close_pdeo+0x58/0x100
[93492.433061]  proc_reg_release+0x6b/0x70
[93492.433061]  __fput+0xea/0x220
[93492.433061]  ____fput+0xe/0x10
[93492.433061]  task_work_run+0x9d/0xc0
[93492.433061]  exit_to_usermode_loop+0xc0/0xd0
[93492.433061]  do_syscall_64+0x115/0x130
[93492.433061]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[93492.433061] RIP: 0033:0x7f15aad96947
[93492.433061] RSP: 002b:00007ffd06de2df8 EFLAGS: 00000206 ORIG_RAX: 0000000000000003
[93492.433061] RAX: 0000000000000000 RBX: 00005636a5885460 RCX: 00007f15aad96947
[93492.433061] RDX: 00007f15ab06d760 RSI: 00005636a58854e3 RDI: 0000000000000003
[93492.433061] RBP: 00007f15ab06e2a0 R08: 00007f15ab28e540 R09: 00007f15ab28e540
[93492.433061] R10: 00000000000001b6 R11: 0000000000000206 R12: 0000000000000000
[93492.433061] R13: 00005636a4a4317c R14: 0000000000000000 R15: 00007ffd06de4fb0
[93492.433061] Code: c2 01 80 3a 00 75 f7 48 83 c6 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed 5d c3 0f 1f 00 80 3f 00 55 48 89 e5 74 14 48 89 f8 <48> 83 c7 01 80 3f 00 75 f7 48 29 c7 48 89 f8 5d c3 31 c0 5d c3

Maybe unrelated, but sometimes I get "Cannot allocate memory" when writing a big chunk to /dev/... . My system has 256G of memory. Maybe kmalloc is not necessary?