Required tools for playing around with memory:
hexdumpobjdumpreadelfxxdgcore
Dexuan Cui dcui
dcui
/ sendRawEth.c
Created
May 20, 2016 10:06
— forked from austinmarton/sendRawEth.c
Send a raw Ethernet frame in Linux
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| /* | |
| * This program is free software: you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation, either version 3 of the License, or | |
| * (at your option) any later version. | |
| */ | |
| #include <arpa/inet.h> | |
| #include <linux/if_packet.h> | |
| #include <stdio.h> |
dcui
/ memory_layout.md
Created
May 10, 2017 12:11
— forked from CMCDragonkai/memory_layout.md
Linux: Understanding the Memory Layout of Linux Executables
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| --- a/drivers/net/hyperv/netvsc.c 2018-06-21 06:21:38.510273512 +0000 | |
| +++ b/drivers/net/hyperv/netvsc.c 2018-06-21 06:33:29.991826355 +0000 | |
| @@ -1251,9 +1251,10 @@ | |
| if (send_recv_completions(ndev, net_device, nvchan) == 0 && | |
| work_done < budget && | |
| netvsc_napi_complete_done(napi, work_done) && | |
| - hv_end_read(&channel->inbound)) { | |
| + hv_end_read(&channel->inbound) && | |
| + napi_schedule_prep(napi)) { | |
| hv_begin_read(&channel->inbound); |
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| diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c | |
| index 64713ff..e51b080 100644 | |
| --- a/drivers/hv/vmbus_drv.c | |
| +++ b/drivers/hv/vmbus_drv.c | |
| @@ -476,6 +476,68 @@ static ssize_t channel_vp_mapping_show(struct device *dev, | |
| } | |
| static DEVICE_ATTR_RO(channel_vp_mapping); | |
| +static ssize_t channel_rb_show(struct device *dev, | |
| + struct device_attribute *dev_attr, |
dcui
/ toeplitz_based_hash.py
Created
May 9, 2019 17:37
— forked from joongh/toeplitz_based_hash.py
Python implementation of Toeplitz-based hash function. It is implemented to understand how the Toeplitz-based hash function works.
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| #!/usr/bin/env python | |
| #-*- coding: utf-8 -*- | |
| # Test data including the secret key, ip, port numbers and the hash values | |
| # as the result is from "Intel Ethernet Controller 710 Series Datasheet". | |
| KEY=[] | |
| def reset_key(): | |
| global KEY |
dcui
/ source.list
Created
May 8, 2020 22:53
— forked from malikalichsan/sources.list
/etc/apt/source.list for ubuntu 19.10
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| # deb cdrom:[Ubuntu 19.10 _Eoan Ermine_ - Release amd64 (20191017)]/ eoan main restricted | |
| # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to | |
| # newer versions of the distribution. | |
| deb http://id.archive.ubuntu.com/ubuntu/ eoan main restricted | |
| # deb-src http://id.archive.ubuntu.com/ubuntu/ eoan main restricted | |
| ## Major bug fix updates produced after the final release of the | |
| ## distribution. | |
| deb http://id.archive.ubuntu.com/ubuntu/ eoan-updates main restricted |
dcui
/ packet-generator.cpp
Created
July 11, 2020 19:11
— forked from jonhoo/packet-generator.cpp
Complete example code showing how to construct a UDP packet from scratch and inject it on a WiFi interface in Linux
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| /** | |
| * Hello, and welcome to this brief, but hopefully complete, example file for | |
| * wireless packet injection using pcap. | |
| * | |
| * Although there are various resources for this spread on the web, it is hard | |
| * to find a single, cohesive piece that shows how everything fits together. | |
| * This file aims to give such an example, constructing a fully valid UDP packet | |
| * all the way from the 802.11 PHY header (through radiotap) to the data part of | |
| * the packet and then injecting it on a wireless interface | |
| * |
dcui
/ net-checksum.c
Created
July 11, 2020 19:48
— forked from fxlv/net-checksum.c
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| /* | |
| * IP checksumming functions. | |
| * (c) 2008 Gerd Hoffmann <[email protected]> | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation; under version 2 of the License. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
dcui
/ centos-install-kernel-debuginfo.sh
Created
August 3, 2020 18:55
— forked from jarek-przygodzki/centos-install-kernel-debuginfo.sh
CentOS 7 - How to install kernel-debuginfo
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| yum --enablerepo=base-debuginfo install -y kernel-debuginfo-$(uname -r) |
dcui
/ latency.txt
Created
May 24, 2021 18:55
— forked from jboner/latency.txt
Latency Numbers Every Programmer Should Know
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| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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