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/* Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Verify that tunables correctly filter out unsafe tunables like
glibc.malloc.check and glibc.malloc.mmap_threshold but also retain
glibc.malloc.mmap_threshold in an unprivileged child. */
/* This is compiled as part of the testsuite but needs to see
HAVE_TUNABLES. */
#define _LIBC 1
#include "config.h"
#undef _LIBC
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <intprops.h>
#include <array_length.h>
#include <support/check.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/capture_subprocess.h>
const char *teststrings[] =
{
"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.check=2:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2",
"glibc.malloc.perturb=0x800",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
":glibc.malloc.garbage=2:glibc.malloc.check=1",
"glibc.malloc.check=1:glibc.malloc.check=2",
"not_valid.malloc.check=2",
"glibc.not_valid.check=2",
};
const char *resultstrings[] =
{
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"",
"",
"",
"",
"",
"",
};
static int
test_child (int off)
{
const char *val = getenv ("GLIBC_TUNABLES");
#if HAVE_TUNABLES
if (val != NULL && strcmp (val, resultstrings[off]) == 0)
return 0;
if (val != NULL)
printf ("[%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
return 1;
#else
if (val != NULL)
{
printf ("[%d] GLIBC_TUNABLES not cleared\n", off);
return 1;
}
return 0;
#endif
}
static int
do_test (int argc, char **argv)
{
/* Setgid child process. */
if (argc == 2)
{
if (getgid () == getegid ())
/* This can happen if the file system is mounted nosuid. */
FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
(intmax_t) getgid ());
int ret = test_child (atoi (argv[1]));
if (ret != 0)
exit (1);
exit (EXIT_SUCCESS);
}
else
{
int ret = 0;
/* Spawn tests. */
for (int i = 0; i < array_length (teststrings); i++)
{
char buf[INT_BUFSIZE_BOUND (int)];
printf ("Spawned test for %s (%d)\n", teststrings[i], i);
snprintf (buf, sizeof (buf), "%d\n", i);
if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
exit (1);
int status = support_capture_subprogram_self_sgid (buf);
/* Bail out early if unsupported. */
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
ret |= status;
}
return ret;
}
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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