mirror of
https://github.com/brl/mutter.git
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c55a3d1edc
SIGXFSZ is triggered for this test when running in a CI runner, but not on real hw. Skip running that part for now. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1557>
283 lines
6.9 KiB
C
283 lines
6.9 KiB
C
/*
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* Copyright (C) 2020 Jonas Dreßler.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <glib.h>
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#include <sys/resource.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <core/meta-anonymous-file.h>
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#if defined(HAVE_MEMFD_CREATE)
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#define READONLY_SEALS (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE)
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#endif
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static const char *teststring = "test string 1234567890";
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static gboolean
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test_read_fd_mmap (int fd,
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const char *expected_string)
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{
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void *mem;
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int string_size;
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string_size = strlen (expected_string) + 1;
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mem = mmap (NULL, string_size, PROT_READ, MAP_PRIVATE, fd, 0);
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g_assert (mem != MAP_FAILED);
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if (strcmp (expected_string, mem) != 0)
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{
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munmap (mem, string_size);
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return FALSE;
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}
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munmap (mem, string_size);
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return TRUE;
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}
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static gboolean
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test_write_fd (int fd,
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const char *string)
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{
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int written_size, string_size;
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string_size = strlen (string) + 1;
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written_size = write (fd, string, string_size);
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if (written_size != string_size)
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return FALSE;
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return TRUE;
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}
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#if defined(HAVE_MEMFD_CREATE)
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static gboolean
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test_readonly_seals (int fd)
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{
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unsigned int seals;
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seals = fcntl (fd, F_GET_SEALS);
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if (seals == -1)
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return FALSE;
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if (seals != READONLY_SEALS)
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return FALSE;
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return TRUE;
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}
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#endif
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static gboolean
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test_write_read (int fd)
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{
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g_autofree char *new_string = g_uuid_string_random ();
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if (!test_write_fd (fd, new_string))
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return FALSE;
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if (!test_read_fd_mmap (fd, new_string))
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return FALSE;
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return TRUE;
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}
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#if defined(HAVE_MEMFD_CREATE)
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static gboolean
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test_open_write_read (const char *path)
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{
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int fd;
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fd = open (path, O_RDWR);
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g_assert (fd != -1);
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if (!test_write_read (fd))
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{
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close (fd);
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return FALSE;
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}
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close (fd);
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return TRUE;
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}
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#endif
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int
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main (int argc,
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char **argv)
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{
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MetaAnonymousFile *file;
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int fd = -1, other_fd = -1;
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g_autofree char *fd_path = NULL;
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file = meta_anonymous_file_new (strlen (teststring) + 1,
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(const uint8_t *) teststring);
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if (!file)
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{
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g_critical ("%s: Creating file failed", __func__);
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return EXIT_FAILURE;
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}
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#if defined(HAVE_MEMFD_CREATE)
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fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_PRIVATE);
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g_assert (fd != -1);
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other_fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_PRIVATE);
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g_assert (other_fd != -1);
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/* When MAPMODE_PRIVATE was used, meta_anonymous_file_open_fd() should always
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* return the same fd. */
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if (other_fd != fd)
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goto fail;
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/* If memfd_create was used and we request a MAPMODE_PRIVATE file, all the
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* readonly seals should be set. */
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if (!test_readonly_seals (fd))
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goto fail;
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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/* Writing and reading the written data should fail */
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if (test_write_read (fd))
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goto fail;
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/* Instead we should still be reading the teststring */
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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/* Opening the fd manually in RW mode and writing to it should fail */
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fd_path = g_strdup_printf ("/proc/%d/fd/%d", getpid (), fd);
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if (test_open_write_read (fd_path))
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goto fail;
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/* Instead we should still be reading the teststring */
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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/* Just to be sure test the other fd, too */
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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meta_anonymous_file_close_fd (fd);
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meta_anonymous_file_close_fd (fd);
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fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_SHARED);
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g_assert (fd != -1);
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other_fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_SHARED);
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g_assert (other_fd != -1);
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/* The MAPMODE_SHARED fd should not have readonly seals applied */
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if (test_readonly_seals (fd))
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goto fail;
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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/* Writing and reading the written data should succeed */
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if (!test_write_read (fd))
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goto fail;
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/* The other fd should still read the teststring though */
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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meta_anonymous_file_close_fd (fd);
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meta_anonymous_file_close_fd (other_fd);
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/* Test an artificial out-of-space situation by setting the maximum file
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* size this process may create to 2 bytes, if memfd_create with
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* MAPMODE_PRIVATE is used, everything should still work (the existing FD
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* should be used). */
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if (!getenv ("CI_JOB_ID"))
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{
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struct rlimit rlimit = {
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.rlim_cur = 2,
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.rlim_max = 2,
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};
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if (setrlimit (RLIMIT_FSIZE, &rlimit) == -1)
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goto fail;
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fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_PRIVATE);
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g_assert (fd != -1);
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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meta_anonymous_file_close_fd (fd);
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}
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#else
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fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_PRIVATE);
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g_assert (fd != -1);
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other_fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_PRIVATE);
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g_assert (other_fd != -1);
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/* Writing and reading the written data should succeed */
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if (!test_write_read (fd))
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goto fail;
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/* The other fd should still read the teststring though */
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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meta_anonymous_file_close_fd (fd);
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meta_anonymous_file_close_fd (other_fd);
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fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_SHARED);
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g_assert (fd != -1);
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other_fd = meta_anonymous_file_open_fd (file, META_ANONYMOUS_FILE_MAPMODE_SHARED);
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g_assert (other_fd != -1);
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if (!test_read_fd_mmap (fd, teststring))
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goto fail;
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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/* Writing and reading the written data should succeed */
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if (!test_write_read (fd))
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goto fail;
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/* The other fd should still read the teststring though */
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if (!test_read_fd_mmap (other_fd, teststring))
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goto fail;
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meta_anonymous_file_close_fd (fd);
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meta_anonymous_file_close_fd (other_fd);
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#endif
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meta_anonymous_file_free (file);
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return EXIT_SUCCESS;
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fail:
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if (fd > 0)
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meta_anonymous_file_close_fd (fd);
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if (other_fd > 0)
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meta_anonymous_file_close_fd (other_fd);
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meta_anonymous_file_free (file);
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return EXIT_FAILURE;
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}
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