Fix getifaddrs, freeifaddrs namespace (bug 17668).

Various objects in glibc bring in ifaddrs.o (via references to
__netlink_*) and thereby getifaddrs and freeifaddrs, which are not
part of any standard supported by glibc.  These should be weak aliases
of __getifaddrs and __freeifaddrs; this patch makes them so.

(The path by which these functions are brought in is Linux-specific,
but it seems less confusing to make all versions of these functions
weak aliases rather than only the Linux-specific versions that
definitely need it.)

Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by this patch).

	[BZ #17668]
	* inet/ifaddrs.c (getifaddrs): Rename to __getifaddrs and define
	as weak alias of __getifaddrs.  Use libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* sysdeps/gnu/ifaddrs.c (getifaddrs): Rename to __getifaddrs and
	define as weak alias of __getifaddrs.  Use libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* sysdeps/unix/sysv/linux/ifaddrs.c (getifaddrs): Rename to
	__getifaddrs and define as weak alias of __getifaddrs.  Use
	libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* conform/Makefile (test-xfail-XOPEN2K/net/if.h/linknamespace):
	Remove variable.
	(test-xfail-POSIX2008/net/if.h/linknamespace): Likewise.
	(test-xfail-XOPEN2K8/net/if.h/linknamespace): Likewise.

6 files changed, 40 insertions, 16 deletions

diff --git a/ChangeLog b/ChangeLog
index f8e0e6c..cbdc3a4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,24 @@
+2014-12-02  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #17668]
+	* inet/ifaddrs.c (getifaddrs): Rename to __getifaddrs and define
+	as weak alias of __getifaddrs.  Use libc_hidden_weak.
+	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
+	__freeifaddrs.  Use libc_hidden_weak.
+	* sysdeps/gnu/ifaddrs.c (getifaddrs): Rename to __getifaddrs and
+	define as weak alias of __getifaddrs.  Use libc_hidden_weak.
+	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
+	__freeifaddrs.  Use libc_hidden_weak.
+	* sysdeps/unix/sysv/linux/ifaddrs.c (getifaddrs): Rename to
+	__getifaddrs and define as weak alias of __getifaddrs.  Use
+	libc_hidden_weak.
+	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
+	__freeifaddrs.  Use libc_hidden_weak.
+	* conform/Makefile (test-xfail-XOPEN2K/net/if.h/linknamespace):
+	Remove variable.
+	(test-xfail-POSIX2008/net/if.h/linknamespace): Likewise.
+	(test-xfail-XOPEN2K8/net/if.h/linknamespace): Likewise.
+
 2014-12-02  Petar Jovanovic  <petar.jovanovic@rt-rk.com>
 
 	[BZ #17601]
diff --git a/NEWS b/NEWS
index 33ab071..581bc8b 100644
--- a/NEWS
+++ b/NEWS
@@ -13,7 +13,7 @@ Version 2.21
   16619, 16740, 16857, 17192, 17266, 17344, 17363, 17370, 17371, 17411,
   17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555, 17570, 17571,
   17572, 17573, 17574, 17581, 17582, 17583, 17584, 17585, 17589, 17594,
-  17601, 17608, 17616, 17625, 17633, 17664, 17665.
+  17601, 17608, 17616, 17625, 17633, 17664, 17665, 17668.
 
 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
   under certain input conditions resulting in the execution of a shell for
diff --git a/conform/Makefile b/conform/Makefile
index eed2843..8f07d87 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -414,7 +414,6 @@ test-xfail-XOPEN2K/glob.h/linknamespace = yes
 test-xfail-XOPEN2K/grp.h/linknamespace = yes
 test-xfail-XOPEN2K/libgen.h/linknamespace = yes
 test-xfail-XOPEN2K/mqueue.h/linknamespace = yes
-test-xfail-XOPEN2K/net/if.h/linknamespace = yes
 test-xfail-XOPEN2K/netdb.h/linknamespace = yes
 test-xfail-XOPEN2K/pthread.h/linknamespace = yes
 test-xfail-XOPEN2K/pwd.h/linknamespace = yes
@@ -436,7 +435,6 @@ test-xfail-POSIX2008/dirent.h/linknamespace = yes
 test-xfail-POSIX2008/fcntl.h/linknamespace = yes
 test-xfail-POSIX2008/grp.h/linknamespace = yes
 test-xfail-POSIX2008/mqueue.h/linknamespace = yes
-test-xfail-POSIX2008/net/if.h/linknamespace = yes
 test-xfail-POSIX2008/netdb.h/linknamespace = yes
 test-xfail-POSIX2008/pthread.h/linknamespace = yes
 test-xfail-POSIX2008/regex.h/linknamespace = yes
@@ -451,7 +449,6 @@ test-xfail-XOPEN2K8/fmtmsg.h/linknamespace = yes
 test-xfail-XOPEN2K8/grp.h/linknamespace = yes
 test-xfail-XOPEN2K8/libgen.h/linknamespace = yes
 test-xfail-XOPEN2K8/mqueue.h/linknamespace = yes
-test-xfail-XOPEN2K8/net/if.h/linknamespace = yes
 test-xfail-XOPEN2K8/netdb.h/linknamespace = yes
 test-xfail-XOPEN2K8/pthread.h/linknamespace = yes
 test-xfail-XOPEN2K8/pwd.h/linknamespace = yes
diff --git a/inet/ifaddrs.c b/inet/ifaddrs.c
index 8071600..bc273c6 100644
--- a/inet/ifaddrs.c
+++ b/inet/ifaddrs.c
@@ -24,16 +24,17 @@
    network interface on the host machine.  If successful, store the
    list in *IFAP and return 0.  On errors, return -1 and set `errno'.  */
 int
-getifaddrs (struct ifaddrs **ifap)
+__getifaddrs (struct ifaddrs **ifap)
 {
   __set_errno (ENOSYS);
   return -1;
 }
-libc_hidden_def (getifaddrs)
+weak_alias (__getifaddrs, getifaddrs)
+libc_hidden_weak (getifaddrs)
 stub_warning (getifaddrs)
 
 void
-freeifaddrs (struct ifaddrs *ifa)
+__freeifaddrs (struct ifaddrs *ifa)
 {
   if (ifa == NULL)
     return;			/* a la free, why not? */
@@ -41,5 +42,6 @@ freeifaddrs (struct ifaddrs *ifa)
   /* Can't be called properly if getifaddrs never succeeded.  */
   abort ();
 }
-libc_hidden_def (freeifaddrs)
+weak_alias (__freeifaddrs, freeifaddrs)
+libc_hidden_weak (freeifaddrs)
 stub_warning (freeifaddrs)
diff --git a/sysdeps/gnu/ifaddrs.c b/sysdeps/gnu/ifaddrs.c
index 1b8775f..3607b2c 100644
--- a/sysdeps/gnu/ifaddrs.c
+++ b/sysdeps/gnu/ifaddrs.c
@@ -32,7 +32,7 @@
    network interface on the host machine.  If successful, store the
    list in *IFAP and return 0.  On errors, return -1 and set `errno'.  */
 int
-getifaddrs (struct ifaddrs **ifap)
+__getifaddrs (struct ifaddrs **ifap)
 {
   /* This implementation handles only IPv4 interfaces.
      The various ioctls below will only work on an AF_INET socket.
@@ -150,13 +150,15 @@ getifaddrs (struct ifaddrs **ifap)
 
   return 0;
 }
+weak_alias (__getifaddrs, getifaddrs)
 #ifndef getifaddrs
-libc_hidden_def (getifaddrs)
+libc_hidden_weak (getifaddrs)
 #endif
 
 void
-freeifaddrs (struct ifaddrs *ifa)
+__freeifaddrs (struct ifaddrs *ifa)
 {
   free (ifa);
 }
-libc_hidden_def (freeifaddrs)
+weak_alias (__freeifaddrs, freeifaddrs)
+libc_hidden_weak (freeifaddrs)
diff --git a/sysdeps/unix/sysv/linux/ifaddrs.c b/sysdeps/unix/sysv/linux/ifaddrs.c
index a47b2ed..3f03f86 100644
--- a/sysdeps/unix/sysv/linux/ifaddrs.c
+++ b/sysdeps/unix/sysv/linux/ifaddrs.c
@@ -819,7 +819,7 @@ getifaddrs_internal (struct ifaddrs **ifap)
    network interface on the host machine.  If successful, store the
    list in *IFAP and return 0.  On errors, return -1 and set `errno'.  */
 int
-getifaddrs (struct ifaddrs **ifap)
+__getifaddrs (struct ifaddrs **ifap)
 {
   int res;
 
@@ -829,12 +829,14 @@ getifaddrs (struct ifaddrs **ifap)
 
   return res;
 }
-libc_hidden_def (getifaddrs)
+weak_alias (__getifaddrs, getifaddrs)
+libc_hidden_weak (getifaddrs)
 
 
 void
-freeifaddrs (struct ifaddrs *ifa)
+__freeifaddrs (struct ifaddrs *ifa)
 {
   free (ifa);
 }
-libc_hidden_def (freeifaddrs)
+weak_alias (__freeifaddrs, freeifaddrs)
+libc_hidden_weak (freeifaddrs)