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/* Copyright (C) 2017-2025 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 GLIBC_TUNABLES is kept unchanged but no tunable is actually
enabled for AT_SECURE processes. */
#include <dl-tunables.h>
#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>
static 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.mmap_threshold=glibc.malloc.mmap_threshold=4096",
"glibc.malloc.check=2",
"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",
};
static int
test_child (int off)
{
const char *val = getenv ("GLIBC_TUNABLES");
int ret = 1;
printf (" [%d] GLIBC_TUNABLES is %s\n", off, val);
fflush (stdout);
if (val != NULL)
printf (" [%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
else
ret = 0;
fflush (stdout);
/* Also check if the set tunables are effectively unchanged. */
int32_t check = TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL);
size_t mmap_threshold = TUNABLE_GET_FULL (glibc, malloc, mmap_threshold,
size_t, NULL);
int32_t perturb = TUNABLE_GET_FULL (glibc, malloc, perturb, int32_t, NULL);
printf (" [%d] glibc.malloc.check=%d\n", off, check);
fflush (stdout);
printf (" [%d] glibc.malloc.mmap_threshold=%zu\n", off, mmap_threshold);
fflush (stdout);
printf (" [%d] glibc.malloc.perturb=%d\n", off, perturb);
fflush (stdout);
ret |= check != 0;
ret |= mmap_threshold != 0;
ret |= perturb != 0;
return ret;
}
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);
/* Special return code to make sure that the child executed all the way
through. */
exit (42);
}
else
{
/* Spawn tests. */
for (int i = 0; i < array_length (teststrings); i++)
{
char buf[INT_BUFSIZE_BOUND (int)];
printf ("[%d] Spawned test for %s\n", i, teststrings[i]);
snprintf (buf, sizeof (buf), "%d\n", i);
fflush (stdout);
if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
{
printf (" [%d] Failed to set GLIBC_TUNABLES: %m", i);
support_record_failure ();
continue;
}
int status = support_capture_subprogram_self_sgid (buf);
/* Bail out early if unsupported. */
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
if (WEXITSTATUS (status) != 42)
{
printf (" [%d] child failed with status %d\n", i,
WEXITSTATUS (status));
support_record_failure ();
}
}
return 0;
}
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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