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061fe3f8ad
Instead of passing GLIBC_TUNABLES via the environment, pass the environment variable from parent to child. This allows us to test multiple variables to ensure better coverage. The test list currently only includes the case that's already being tested. More tests will be added later. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/* Copyright (C) 2017-2021 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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Verify that tunables correctly filter out unsafe tunables like
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glibc.malloc.check and glibc.malloc.mmap_threshold but also retain
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glibc.malloc.mmap_threshold in an unprivileged child. */
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/* This is compiled as part of the testsuite but needs to see
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HAVE_TUNABLES. */
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#define _LIBC 1
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#include "config.h"
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#undef _LIBC
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <intprops.h>
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#include <array_length.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/capture_subprocess.h>
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const char *teststrings[] =
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{
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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};
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const char *resultstrings[] =
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{
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"glibc.malloc.mmap_threshold=4096",
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};
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static int
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test_child (int off)
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{
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const char *val = getenv ("GLIBC_TUNABLES");
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#if HAVE_TUNABLES
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if (val != NULL && strcmp (val, resultstrings[off]) == 0)
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return 0;
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if (val != NULL)
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printf ("[%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
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return 1;
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#else
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if (val != NULL)
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{
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printf ("[%d] GLIBC_TUNABLES not cleared\n", off);
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return 1;
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}
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return 0;
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#endif
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}
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static int
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do_test (int argc, char **argv)
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{
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/* Setgid child process. */
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if (argc == 2)
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{
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if (getgid () == getegid ())
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/* This can happen if the file system is mounted nosuid. */
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FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
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(intmax_t) getgid ());
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int ret = test_child (atoi (argv[1]));
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if (ret != 0)
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exit (1);
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exit (EXIT_SUCCESS);
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}
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else
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{
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int ret = 0;
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/* Spawn tests. */
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for (int i = 0; i < array_length (teststrings); i++)
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{
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char buf[INT_BUFSIZE_BOUND (int)];
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printf ("Spawned test for %s (%d)\n", teststrings[i], i);
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snprintf (buf, sizeof (buf), "%d\n", i);
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if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
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exit (1);
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int status = support_capture_subprogram_self_sgid (buf);
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/* Bail out early if unsupported. */
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if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
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return EXIT_UNSUPPORTED;
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ret |= status;
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}
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return ret;
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}
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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