New: CONFIG_PROC_SYSCTL is required for networking

Bug 75221 Daniel Borkmann 1 participant 1 message May 1, 2014 1 message not in the archive

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Networking Network drivers

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Daniel Borkmann

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2014-05-01 11:38 UTC #1 lore raw

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-------- Original Message --------
Subject: [Bug 75221] New: CONFIG_PROC_SYSCTL is required for networking
Date: Thu, 01 May 2014 10:17:24 +0000
From: [email protected]
To: [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=75221

            Bug ID: 75221
           Summary: CONFIG_PROC_SYSCTL is required for networking
           Product: Networking
           Version: 2.5
    Kernel Version: 3.14.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

I am in the proces of building an embedded kernel which I wanted to limit in both functionality and memory. For this reason I disabled CONFIG_PROC_SYSCTL. I have figured out the hard way that this functionality implements the successful randomisation of source ports, it might be responsible for the initialisation of net.ipv4.ip_local_port_range.

Effectively, booting a kernel with ip=dhcp works. Ping-pong (ICMP) to and from an address works. DNS queries (UDP/53) don't because the source port remains 0, a connection to a typical webserver also seems to result in a no reply situation.

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