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/* Copyright (C) 2012-2021 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 environment variables like
MALLOC_CHECK_ and MALLOC_MMAP_THRESHOLD_ but also retain
MALLOC_MMAP_THRESHOLD_ in an unprivileged child. */
#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 <support/check.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/capture_subprocess.h>
static char SETGID_CHILD[] = "setgid-child";
#ifndef test_child
static int
test_child (void)
{
if (getenv ("MALLOC_CHECK_") != NULL)
{
printf ("MALLOC_CHECK_ is still set\n");
return 1;
}
if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL)
{
printf ("MALLOC_MMAP_THRESHOLD_ lost\n");
return 1;
}
if (getenv ("LD_HWCAP_MASK") != NULL)
{
printf ("LD_HWCAP_MASK still set\n");
return 1;
}
return 0;
}
#endif
#ifndef test_parent
static int
test_parent (void)
{
if (getenv ("MALLOC_CHECK_") == NULL)
{
printf ("MALLOC_CHECK_ lost\n");
return 1;
}
if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL)
{
printf ("MALLOC_MMAP_THRESHOLD_ lost\n");
return 1;
}
if (getenv ("LD_HWCAP_MASK") == NULL)
{
printf ("LD_HWCAP_MASK lost\n");
return 1;
}
return 0;
}
#endif
static int
do_test (int argc, char **argv)
{
/* Setgid child process. */
if (argc == 2 && strcmp (argv[1], SETGID_CHILD) == 0)
{
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 ();
if (ret != 0)
exit (1);
exit (EXIT_SUCCESS);
}
else
{
if (test_parent () != 0)
exit (1);
int status = support_capture_subprogram_self_sgid (SETGID_CHILD);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
if (!WIFEXITED (status))
FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
return 0;
}
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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