Fix resolver inet_* namespace (bug 17722).

Parts of the resolver brought in by pthreads (at least) use inet_*
functions that aren't in the 1995/6 edition of POSIX that introduced
pthreads (or in one case, use __inet_aton which is then defined in the
same file as non-weak inet_addr).  This patch fixes this by making the
affected functions into weak alias for __inet_* and using those names
in the problematic resolver code.

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

	[BZ #17722]
	* inet/inet_mkadr.c (inet_makeaddr): Rename to __inet_makeaddr and
	define as weak alias of __inet_makeaddr.
	* resolv/inet_addr.c (inet_addr): Rename to __inet_addr and define
	as weak alias of __inet_addr.
	* resolv/inet_pton.c (inet_pton): Rename to __inet_pton and define
	as weak alias of __inet_pton.  Use libc_hidden_weak.
	* include/arpa/inet.h (__inet_pton): Declare.  Use
	libc_hidden_proto.
	(inet_makeaddr): Don't use libc_hidden_proto.
	(__inet_makeaddr): Declare.  Use libc_hidden_proto.
	* resolv/res_init.c (__res_vinit): Use __inet_pton instead of
	inet_pton.  Use __inet_makeaddr instead of inet_makeaddr.
	* conform/Makefile (test-xfail-POSIX/pthread.h/linknamespace):
	Remove variable.
	(test-xfail-POSIX/sched.h/linknamespace): Likewise.
	(test-xfail-POSIX/time.h/linknamespace): Likewise.

ChangeLog

@@ -1,3 +1,23 @@
+2014-12-17  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #17722]
+	* inet/inet_mkadr.c (inet_makeaddr): Rename to __inet_makeaddr and
+	define as weak alias of __inet_makeaddr.
+	* resolv/inet_addr.c (inet_addr): Rename to __inet_addr and define
+	as weak alias of __inet_addr.
+	* resolv/inet_pton.c (inet_pton): Rename to __inet_pton and define
+	as weak alias of __inet_pton.  Use libc_hidden_weak.
+	* include/arpa/inet.h (__inet_pton): Declare.  Use
+	libc_hidden_proto.
+	(inet_makeaddr): Don't use libc_hidden_proto.
+	(__inet_makeaddr): Declare.  Use libc_hidden_proto.
+	* resolv/res_init.c (__res_vinit): Use __inet_pton instead of
+	inet_pton.  Use __inet_makeaddr instead of inet_makeaddr.
+	* conform/Makefile (test-xfail-POSIX/pthread.h/linknamespace):
+	Remove variable.
+	(test-xfail-POSIX/sched.h/linknamespace): Likewise.
+	(test-xfail-POSIX/time.h/linknamespace): Likewise.
+
 2014-12-17  Steve Ellcey  <sellcey@imgtec.com>
 
 	* inet/getnetgrent_r.c: Move while loop to be inside if statement.

NEWS

@@ -14,7 +14,8 @@ Version 2.21
   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, 17630, 17633,
-  17634, 17647, 17653, 17657, 17664, 17665, 17668, 17682, 17717, 17719.
+  17634, 17647, 17653, 17657, 17664, 17665, 17668, 17682, 17717, 17719,
+  17722.
 
 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
   under certain input conditions resulting in the execution of a shell for

conform/Makefile

@@ -371,11 +371,8 @@ test-xfail-POSIX/aio.h/linknamespace = yes
 test-xfail-POSIX/fnmatch.h/linknamespace = yes
 test-xfail-POSIX/glob.h/linknamespace = yes
 test-xfail-POSIX/mqueue.h/linknamespace = yes
-test-xfail-POSIX/pthread.h/linknamespace = yes
 test-xfail-POSIX/regex.h/linknamespace = yes
-test-xfail-POSIX/sched.h/linknamespace = yes
 test-xfail-POSIX/semaphore.h/linknamespace = yes
-test-xfail-POSIX/time.h/linknamespace = yes
 test-xfail-POSIX/unistd.h/linknamespace = yes
 test-xfail-POSIX/wordexp.h/linknamespace = yes
 test-xfail-UNIX98/ctype.h/linknamespace = yes

include/arpa/inet.h

@@ -7,6 +7,9 @@ libc_hidden_proto (__inet_aton)
 libc_hidden_proto (inet_aton)
 libc_hidden_proto (inet_ntop)
 libc_hidden_proto (inet_pton)
-libc_hidden_proto (inet_makeaddr)
+extern __typeof (inet_pton) __inet_pton;
+libc_hidden_proto (__inet_pton)
+extern __typeof (inet_makeaddr) __inet_makeaddr;
+libc_hidden_proto (__inet_makeaddr)
 libc_hidden_proto (inet_netof)
 #endif

inet/inet_mkadr.c

@@ -40,7 +40,7 @@ static char sccsid[] = "@(#)inet_makeaddr.c	8.1 (Berkeley) 6/4/93";
  * building addresses stored in the ifnet structure.
  */
 struct in_addr
-inet_makeaddr(net, host)
+__inet_makeaddr(net, host)
 	in_addr_t net, host;
 {
 	struct in_addr in;
@@ -56,4 +56,5 @@ inet_makeaddr(net, host)
 	in.s_addr = htonl(in.s_addr);
 	return in;
 }
-libc_hidden_def (inet_makeaddr)
+libc_hidden_def (__inet_makeaddr)
+weak_alias (__inet_makeaddr, inet_makeaddr)

resolv/inet_addr.c

@@ -90,13 +90,14 @@ static const char rcsid[] = "$BINDId: inet_addr.c,v 8.11 1999/10/13 16:39:25 vix
  * The value returned is in network order.
  */
 in_addr_t
-inet_addr(const char *cp) {
+__inet_addr(const char *cp) {
 	struct in_addr val;
 
 	if (__inet_aton(cp, &val))
 		return (val.s_addr);
 	return (INADDR_NONE);
 }
+weak_alias (__inet_addr, inet_addr)
 
 /*
  * Check whether "cp" is a valid ascii representation

resolv/inet_pton.c

@@ -49,7 +49,7 @@ static int inet_pton6 (const char *src, u_char *dst) internal_function;
  *	Paul Vixie, 1996.
  */
 int
-inet_pton(af, src, dst)
+__inet_pton(af, src, dst)
 	int af;
 	const char *src;
 	void *dst;
@@ -65,7 +65,9 @@ inet_pton(af, src, dst)
 	}
 	/* NOTREACHED */
 }
-libc_hidden_def (inet_pton)
+libc_hidden_def (__inet_pton)
+weak_alias (__inet_pton, inet_pton)
+libc_hidden_weak (inet_pton)
 
 /* int
  * inet_pton4(src, dst)

resolv/res_init.c

@@ -324,7 +324,7 @@ __res_vinit(res_state statp, int preinit) {
 			if ((el = strchr(cp, SCOPE_DELIMITER)) != NULL)
 			    *el = '\0';
 			if ((*cp != '\0') &&
-			    (inet_pton(AF_INET6, cp, &a6) > 0)) {
+			    (__inet_pton(AF_INET6, cp, &a6) > 0)) {
 			    struct sockaddr_in6 *sa6;
 
 			    sa6 = malloc(sizeof(*sa6));
@@ -428,7 +428,7 @@ __res_vinit(res_state statp, int preinit) {
 	    (void) fclose(fp);
 	}
 	if (__builtin_expect(statp->nscount == 0, 0)) {
-	    statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
+	    statp->nsaddr.sin_addr = __inet_makeaddr(IN_LOOPBACKNET, 1);
 	    statp->nsaddr.sin_family = AF_INET;
 	    statp->nsaddr.sin_port = htons(NAMESERVER_PORT);
 	    statp->nscount = 1;