[Bug 200323] BPF userland misuse can crash the system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200323

            Bug ID: 200323
           Summary: BPF userland misuse can crash the system
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eri at pfsense.org

Created attachment 156930
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156930&action=edit
Misbehaving proxy arp daemon on bpf

A bpf daemon can crash FreeBSD 10 system if it wrongly behaves.

After analysis seems that a userland process opening a blocking read descriptor
and never reading from it will consume the BPF buffers in kernel eventually
leading to a crash on the system.
This happens with bpf zerocopy enabled/disabled.

Attached is a software used for proxy arp through BPF that caused the
misbehaviour on the system.
Depending on the load, traffic moving through the system this issue could be
reproduced several times a day or even needing up to 4 days to reproduce.

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