150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
/* Copyright (C) 2017-2022 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
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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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"glibc.malloc.check=2:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2",
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"glibc.malloc.perturb=0x800",
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"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
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"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
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"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
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":glibc.malloc.garbage=2:glibc.malloc.check=1",
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"glibc.malloc.check=1:glibc.malloc.check=2",
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"not_valid.malloc.check=2",
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"glibc.not_valid.check=2",
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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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"glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.perturb=0x800",
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"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.mmap_threshold=4096",
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"",
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"",
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"",
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"",
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"",
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"",
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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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