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* [Bug network/19074] New: Data race in _res_hconf_reorder_addrs
@ 2015-10-06 12:17 fweimer at redhat dot com
  2015-10-14 14:50 ` [Bug network/19074] " cvs-commit at gcc dot gnu.org
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2015-10-06 12:17 UTC (permalink / raw)
  To: glibc-bugs

https://sourceware.org/bugzilla/show_bug.cgi?id=19074

            Bug ID: 19074
           Summary: Data race in _res_hconf_reorder_addrs
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: fweimer at redhat dot com
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

_res_hconf_reorder_addrs contains an instance of the incorrect double-checked
locking idiom:

  /* Number of interfaces.  */
  static int num_ifs = -1;
  /* We need to protect the dynamic buffer handling.  */
  __libc_lock_define_initialized (static, lock);
…
  if (num_ifs <= 0)
    {
…
      /* Get lock.  */
      __libc_lock_lock (lock);

      /* Recheck, somebody else might have done the work by now.  */
      if (num_ifs <= 0)
…
          num_ifs = new_num_ifs;
        }

      __libc_lock_unlock (lock);

num_ifs needs to be accessed with acquire loads and a release store.

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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/19074] Data race in _res_hconf_reorder_addrs
Date: Tue, 06 Oct 2015 12:17:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x19074

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

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^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-10-29 17:11 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-10-06 12:17 [Bug network/19074] New: Data race in _res_hconf_reorder_addrs fweimer at redhat dot com
2015-10-14 14:50 ` [Bug network/19074] " cvs-commit at gcc dot gnu.org
2015-10-14 14:50 ` fweimer at redhat dot com
2015-10-29 17:11 ` jsm28 at gcc dot gnu.org

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