[PR #6157] Fix duplicate address detection (ARP) #5849

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opened 2026-05-05 10:46:04 -06:00 by gitea-mirror · 0 comments

gitea-mirror commented

2026-05-05 10:46:04 -06:00

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📋 Pull Request Information

Original PR: https://github.com/netblue30/firejail/pull/6157
Author: @brianvanderburg2
Created: 1/16/2024
Status: 🔄 Open

Base: master ← Head: master

📝 Commits (1)

35a8a53 Fix duplicate address detection

📊 Changes

1 file changed (+18 additions, -7 deletions)

View changed files

📝 src/firejail/arp.c (+18 -7)

📄 Description

The original code compare the target IP of an ARP reply packet with the srcaddr/sender IP of the request packet. Instead it should compare the source IP of the ARP reply with the destaddr/target IP of the request packet. In addition this adds the check for ARP requests with the same IP address in case other systems are probing for the same IP at the same time as per recommendation in RFC5227:

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netblue30/firejail/pull/6157 **Author:** [@brianvanderburg2](https://github.com/brianvanderburg2) **Created:** 1/16/2024 **Status:** 🔄 Open **Base:** `master` ← **Head:** `master` --- ### 📝 Commits (1) - [`35a8a53`](https://github.com/netblue30/firejail/commit/35a8a53612a84bc73bf11bf6d860eb039d512255) Fix duplicate address detection ### 📊 Changes **1 file changed** (+18 additions, -7 deletions) <details> <summary>View changed files</summary> 📝 `src/firejail/arp.c` (+18 -7) </details> ### 📄 Description The original code compare the target IP of an ARP reply packet with the srcaddr/sender IP of the request packet. Instead it should compare the source IP of the ARP reply with the destaddr/target IP of the request packet. In addition this adds the check for ARP requests with the same IP address in case other systems are probing for the same IP at the same time as per recommendation in RFC5227: ![image](https://github.com/netblue30/firejail/assets/2142408/4a6d8a0b-afad-45fe-9c93-4bb975d193da) --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

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Reference: github-starred/firejail#5849

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