sunrpc/tst-udp-error.c

   1 /* Check for use-after-free in clntudp_call (bug 21115).
   2    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <netinet/in.h>
  20 #include <rpc/clnt.h>
  21 #include <rpc/svc.h>
  22 #include <support/check.h>
  23 #include <support/namespace.h>
  24 #include <support/xsocket.h>
  25 #include <unistd.h>
  26
  27 static int
  28 do_test (void)
  29 {
  30   support_become_root ();
  31   support_enter_network_namespace ();
  32
  33   /* Obtain a likely-unused port number.  */
  34   struct sockaddr_in sin =
  35     {
  36       .sin_family = AF_INET,
  37       .sin_addr.s_addr = htonl (INADDR_LOOPBACK),
  38     };
  39   {
  40     int fd = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
  41     xbind (fd, (struct sockaddr *) &sin, sizeof (sin));
  42     socklen_t sinlen = sizeof (sin);
  43     xgetsockname (fd, (struct sockaddr *) &sin, &sinlen);
  44     /* Close the socket, so that we will receive an error below.  */
  45     close (fd);
  46   }
  47
  48   int sock = RPC_ANYSOCK;
  49   CLIENT *clnt = clntudp_create
  50     (&sin, 1, 2, (struct timeval) { 1, 0 }, &sock);
  51   TEST_VERIFY_EXIT (clnt != NULL);
  52   TEST_VERIFY (clnt_call (clnt, 3,
  53                           (xdrproc_t) xdr_void, NULL,
  54                           (xdrproc_t) xdr_void, NULL,
  55                           ((struct timeval) { 3, 0 }))
  56                == RPC_CANTRECV);
  57   clnt_destroy (clnt);
  58
  59   return 0;
  60 }
  61
  62 #include <support/test-driver.c>