118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
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/* Test ldconfig after /etc/ld.so.conf update and verify that a running process
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observes changes to /etc/ld.so.cache.
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xdlfcn.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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#define DSO "libldconfig-ld-mod.so"
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#define DSO_DIR "/tmp/tst-ldconfig"
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#define CONF "/etc/ld.so.conf"
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static void
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run_ldconfig (void *x __attribute__((unused)))
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{
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char *prog = xasprintf ("%s/ldconfig", support_install_rootsbindir);
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char *args[] = { prog, NULL };
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execv (args[0], args);
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FAIL_EXIT1 ("execv: %m");
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}
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/* Create a new directory.
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Copy a test shared object there.
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Try to dlopen it by soname. This should fail.
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(Directory is not searched.)
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Run ldconfig.
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Try to dlopen it again. It should still fail.
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(Directory is still not searched.)
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Add the directory to /etc/ld.so.conf.
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Try to dlopen it again. It should still fail.
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(The loader does not read /etc/ld.so.conf, only /etc/ld.so.cache.)
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Run ldconfig.
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Try to dlopen it again. This should finally succeed. */
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static int
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do_test (void)
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{
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struct support_capture_subprocess result;
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/* Create the needed directories. */
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xmkdirp ("/var/cache/ldconfig", 0777);
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xmkdirp (DSO_DIR, 0777);
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/* Rename the DSO to start with "lib" because there's an undocumented
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filter in ldconfig where it ignores any file that doesn't start with
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"lib" (for regular shared libraries) or "ld-" (for ld-linux-*). */
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char *mod_src_path = xasprintf ("%s/tst-ldconfig-ld-mod.so",
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support_libdir_prefix);
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if (rename (mod_src_path, "/tmp/tst-ldconfig/libldconfig-ld-mod.so"))
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FAIL_EXIT1 ("Renaming/moving the DSO failed: %m");
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free (mod_src_path);
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/* Open the DSO. We expect this to fail - tst-ldconfig directory
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is not searched. */
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TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL);
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FILE *fp = xfopen (CONF, "a+");
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if (!fp)
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FAIL_EXIT1 ("creating /etc/ld.so.conf failed: %m");
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xfclose (fp);
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/* Run ldconfig. */
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result = support_capture_subprocess (run_ldconfig, NULL);
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support_capture_subprocess_check (&result, "execv", 0, sc_allow_none);
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/* Try to dlopen the same DSO again, we expect this to fail again. */
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TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL);
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/* Add tst-ldconfig directory to /etc/ld.so.conf. */
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fp = xfopen (CONF, "w");
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if (!(fwrite (DSO_DIR, 1, sizeof (DSO_DIR), fp)))
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FAIL_EXIT1 ("updating /etc/ld.so.conf failed: %m");
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xfclose (fp);
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/* Try to dlopen the same DSO again, we expect this to still fail. */
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TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL);
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/* Run ldconfig again. */
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result = support_capture_subprocess (run_ldconfig, NULL);
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support_capture_subprocess_check (&result, "execv", 0, sc_allow_none);
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support_capture_subprocess_free (&result);
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/* Finally, we expect dlopen to pass now. */
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TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) != NULL);
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return 0;
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}
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#include <support/test-driver.c>
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