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/* Check the VMA name decoration.
Copyright (C) 2023-2024 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/>. */
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xthread.h>
#include <support/xunistd.h>
#include <sys/mman.h>
#ifndef MAP_STACK
# define MAP_STACK 0
#endif
static pthread_barrier_t b;
static int expected_n_arenas;
static void *
tf (void *closure)
{
void *p = xmalloc (1024);
/* Wait the thread startup, so thread stack is allocated. */
xpthread_barrier_wait (&b);
/* Wait the test to read the process mapping. */
xpthread_barrier_wait (&b);
free (p);
return NULL;
}
struct proc_maps_t
{
int n_def_threads;
int n_user_threads;
int n_arenas;
int n_malloc_mmap;
int n_loader_malloc_mmap;
};
static struct proc_maps_t
read_proc_maps (void)
{
if (test_verbose)
printf ("=== print process %jd memory mapping ===\n",
(intmax_t) getpid ());
struct proc_maps_t r = { 0 };
FILE *f = xfopen ("/proc/self/maps", "r");
char *line = NULL;
size_t line_len = 0;
while (xgetline (&line, &line_len, f))
{
if (test_verbose)
printf ("%s", line);
if (strstr (line, "[anon: glibc: pthread stack:") != NULL)
r.n_def_threads++;
else if (strstr (line, "[anon: glibc: pthread user stack:") != NULL)
r.n_user_threads++;
else if (strstr (line, "[anon: glibc: malloc arena]") != NULL)
r.n_arenas++;
else if (strstr (line, "[anon: glibc: malloc]") != NULL)
r.n_malloc_mmap++;
else if (strstr (line, "[anon: glibc: loader malloc]") != NULL)
r.n_loader_malloc_mmap++;
}
free (line);
xfclose (f);
if (test_verbose)
printf ("===\n");
return r;
}
static void
do_test_threads (bool set_guard)
{
enum
{
num_def_threads = 8,
num_user_threads = 2,
num_threads = num_def_threads + num_user_threads,
};
xpthread_barrier_init (&b, NULL, num_threads + 1);
/* Issue a large malloc to trigger a mmap call. */
void *p = xmalloc (256 * 1024);
pthread_t thr[num_threads];
{
int i = 0;
for (; i < num_threads - num_user_threads; i++)
{
pthread_attr_t attr;
xpthread_attr_init (&attr);
/* The guard page is not annotated. */
if (!set_guard)
xpthread_attr_setguardsize (&attr, 0);
thr[i] = xpthread_create (&attr, tf, NULL);
xpthread_attr_destroy (&attr);
}
for (; i < num_threads; i++)
{
pthread_attr_t attr;
xpthread_attr_init (&attr);
size_t stacksize = support_small_thread_stack_size ();
void *stack = xmmap (0,
stacksize,
PROT_READ | PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK,
-1);
xpthread_attr_setstack (&attr, stack, stacksize);
if (!set_guard)
xpthread_attr_setguardsize (&attr, 0);
thr[i] = xpthread_create (&attr, tf, NULL);
xpthread_attr_destroy (&attr);
}
}
/* Wait all threads to finshed statup and stack allocation. */
xpthread_barrier_wait (&b);
{
struct proc_maps_t r = read_proc_maps ();
TEST_COMPARE (r.n_def_threads, num_def_threads);
TEST_COMPARE (r.n_user_threads, num_user_threads);
TEST_COMPARE (r.n_arenas, expected_n_arenas);
TEST_COMPARE (r.n_malloc_mmap, 1);
/* On some architectures the loader might use more than one page. */
TEST_VERIFY (r.n_loader_malloc_mmap >= 1);
}
/* Let the threads finish. */
xpthread_barrier_wait (&b);
for (int i = 0; i < num_threads; i++)
xpthread_join (thr[i]);
{
struct proc_maps_t r = read_proc_maps ();
TEST_COMPARE (r.n_def_threads, 0);
TEST_COMPARE (r.n_user_threads, 0);
TEST_COMPARE (r.n_arenas, expected_n_arenas);
TEST_COMPARE (r.n_malloc_mmap, 1);
TEST_VERIFY (r.n_loader_malloc_mmap >= 1);
}
free (p);
}
static void
do_prepare (int argc, char *argv[])
{
TEST_VERIFY_EXIT (argc == 2);
expected_n_arenas = strtol (argv[1], NULL, 10);
expected_n_arenas = expected_n_arenas - 1;
}
#define PREPARE do_prepare
static int
do_test (void)
{
support_need_proc ("Reads /proc/self/maps to get stack names.");
if (!support_set_vma_name_supported ())
FAIL_UNSUPPORTED ("kernel does not support PR_SET_VMA_ANON_NAME");
do_test_threads (false);
do_test_threads (true);
return 0;
}
#include <support/test-driver.c>
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