From: "usa (Usaku NAKAMURA)" <usa@...>
Date: 2013-02-05T18:33:14+09:00
Subject: [ruby-core:51871] [Backport93 - Backport #7786] fix for abstract namespace


Issue #7786 has been updated by usa (Usaku NAKAMURA).


Q1: Is this related to [Backport #7775] ?
Q2: Can you show the revision of the related change(s) in trunk?
Q3: Where the "attached patch"? :)
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Backport #7786: fix for abstract namespace
https://bugs.ruby-lang.org/issues/7786#change-35858

Author: shugo (Shugo Maeda)
Status: Assigned
Priority: Normal
Assignee: usa (Usaku NAKAMURA)
Category: 
Target version: 


=begin
Please apply the attached patch to Ruby 1.9.3.

In Ruby 1.9.3, the addrlen argument for bind(2) and connect(2) is set to sizeof(struct sockaddr_un).
However, on Linux, if sun_path starts with NUL, which means that the socket's address is in abstract namespace, the first (addrlen  - sizeof(sa_family_t)) bytes of sun_path is used as the name of the socket, so the socket name is filled with extra NULs unintentionally.  Please see unix(7) for details.

The patch introduces a new function rsock_unix_sockaddr_len() to calculate the correct address length on Linux.

Besides that, the patch includes the following changes.

* fix Socket.unix_server_socket not to access the file system if the specified name is in abstract namespace.
* fix rsock_init_unixsock to use rb_inspect() to avoid ArgumentError in rb_sys_fail_str() when path includes NUL.
* support the longest path in sockaddr_un.
  * This change is necessary for backward compatibility.  Without it, the old name filled with extra NULs cannot be specified like UNIXSocket.open(name + "\0" * (108 - name.bytesize)).
=end



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