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122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/* Test for the memfd_create system call.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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#include <sys/mman.h>
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/* Return true if the descriptor has the FD_CLOEXEC flag set. */
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static bool
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is_cloexec (int fd)
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{
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int flags = fcntl (fd, F_GETFD);
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TEST_VERIFY (flags >= 0);
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return flags & FD_CLOEXEC;
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}
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/* Return the seals set on FD. */
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static int
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get_seals (int fd)
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{
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int flags = fcntl (fd, F_GET_SEALS);
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TEST_VERIFY (flags >= 0);
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return flags;
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}
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/* Return true if the F_SEAL_SEAL flag is set on the descriptor. */
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static bool
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is_sealed (int fd)
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{
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return get_seals (fd) & F_SEAL_SEAL;
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}
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static int
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do_test (void)
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{
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/* Initialized by the first call to memfd_create to 0 (memfd_create
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unsupported) or 1 (memfd_create is implemented in the kernel).
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Subsequent iterations check that the success/failure state is
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consistent. */
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int supported = -1;
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for (int do_cloexec = 0; do_cloexec < 2; ++do_cloexec)
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for (int do_sealing = 0; do_sealing < 2; ++do_sealing)
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{
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int flags = 0;
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if (do_cloexec)
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flags |= MFD_CLOEXEC;
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if (do_sealing)
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flags |= MFD_ALLOW_SEALING;
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if (test_verbose > 0)
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printf ("info: memfd_create with flags=0x%x\n", flags);
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int fd = memfd_create ("tst-memfd_create", flags);
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if (fd < 0)
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{
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if (errno == ENOSYS)
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{
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if (supported < 0)
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{
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printf ("warning: memfd_create is unsupported\n");
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supported = 0;
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continue;
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}
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TEST_VERIFY (supported == 0);
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continue;
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}
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else
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FAIL_EXIT1 ("memfd_create: %m");
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}
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if (supported < 0)
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supported = 1;
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TEST_VERIFY (supported > 0);
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char *fd_path = xasprintf ("/proc/self/fd/%d", fd);
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char *link = xreadlink (fd_path);
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if (test_verbose > 0)
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printf ("info: memfd link: %s\n", link);
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TEST_VERIFY (strcmp (link, "memfd:tst-memfd_create (deleted)"));
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TEST_VERIFY (is_cloexec (fd) == do_cloexec);
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TEST_VERIFY (is_sealed (fd) == !do_sealing);
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if (do_sealing)
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{
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TEST_VERIFY (fcntl (fd, F_ADD_SEALS, F_SEAL_WRITE) == 0);
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TEST_VERIFY (!is_sealed (fd));
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TEST_VERIFY (get_seals (fd) & F_SEAL_WRITE);
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TEST_VERIFY (fcntl (fd, F_ADD_SEALS, F_SEAL_SEAL) == 0);
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TEST_VERIFY (is_sealed (fd));
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}
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xclose (fd);
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free (fd_path);
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free (link);
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}
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if (supported == 0)
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return EXIT_UNSUPPORTED;
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return 0;
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}
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#include <support/test-driver.c>
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