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/* Copyright (C) 2012-2023 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 correctly filter out unsafe environment variables defined
in unsecvars.h. */
#include <array_length.h>
#include <gnu/lib-names.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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";
#define FILTERED_VALUE "some-filtered-value"
#define UNFILTERED_VALUE "some-unfiltered-value"
struct envvar_t
{
const char *env;
const char *value;
};
/* That is not an extensible list of all filtered out environment
variables. */
static const struct envvar_t filtered_envvars[] =
{
{ "GLIBC_TUNABLES", FILTERED_VALUE },
{ "LD_AUDIT", FILTERED_VALUE },
{ "LD_HWCAP_MASK", FILTERED_VALUE },
{ "LD_LIBRARY_PATH", FILTERED_VALUE },
{ "LD_PRELOAD", FILTERED_VALUE },
{ "LD_PROFILE", FILTERED_VALUE },
{ "MALLOC_ARENA_MAX", FILTERED_VALUE },
{ "MALLOC_PERTURB_", FILTERED_VALUE },
{ "MALLOC_TRACE", FILTERED_VALUE },
{ "MALLOC_TRIM_THRESHOLD_", FILTERED_VALUE },
{ "RES_OPTIONS", FILTERED_VALUE },
};
static const struct envvar_t unfiltered_envvars[] =
{
{ "LD_BIND_NOW", "0" },
{ "LD_BIND_NOT", "1" },
/* Non longer supported option. */
{ "LD_ASSUME_KERNEL", UNFILTERED_VALUE },
};
static int
test_child (void)
{
int ret = 0;
for (const struct envvar_t *e = filtered_envvars;
e != array_end (filtered_envvars);
e++)
{
const char *env = getenv (e->env);
ret |= env != NULL;
}
for (const struct envvar_t *e = unfiltered_envvars;
e != array_end (unfiltered_envvars);
e++)
{
const char *env = getenv (e->env);
ret |= !(env != NULL && strcmp (env, e->value) == 0);
}
return ret;
}
static int
do_test (int argc, char **argv)
{
/* For dynamic loader, the test requires --enable-hardcoded-path-in-tests so
the kernel sets the AT_SECURE on process initialization. */
if (argc >= 2 && strstr (argv[1], LD_SO) != 0)
FAIL_UNSUPPORTED ("dynamic test requires --enable-hardcoded-path-in-tests");
/* 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);
/* Special return code to make sure that the child executed all the way
through. */
exit (42);
}
else
{
for (const struct envvar_t *e = filtered_envvars;
e != array_end (filtered_envvars);
e++)
setenv (e->env, e->value, 1);
for (const struct envvar_t *e = unfiltered_envvars;
e != array_end (unfiltered_envvars);
e++)
setenv (e->env, e->value, 1);
int status = support_capture_subprogram_self_sgid (SETGID_CHILD);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
exit (EXIT_UNSUPPORTED);
if (WEXITSTATUS (status) != 42)
{
printf (" child failed with status %d\n",
WEXITSTATUS (status));
support_record_failure ();
}
return 0;
}
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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