diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-openat2.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/tst-openat2.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-openat2.c b/sysdeps/unix/sysv/linux/tst-openat2.c new file mode 100644 index 0000000000..6936b9fcef --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-openat2.c @@ -0,0 +1,259 @@ +/* Linux openat2 tests. + Copyright (C) 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/>. */ + +/* openat2 is only support in LFS mode. */ +#define _FILE_OFFSET_BITS 64 + +#include <array_length.h> +#include <errno.h> +#include <fcntl.h> +#include <stdint.h> +#include <support/check.h> +#include <support/temp_file.h> +#include <support/xunistd.h> + +static int dir_fd; + +static void +do_prepare (int argc, char *argv[]) +{ + char *temp_dir = support_create_temp_directory ("tst-openat2"); + dir_fd = xopen (temp_dir, O_RDONLY | O_DIRECTORY, 0); +} +#define PREPARE do_prepare + +static int +do_test_struct (void) +{ + static struct struct_test + { + struct open_how_ext + { + struct open_how inner; + int extra1; + int extra2; + int extra3; + } arg; + size_t size; + int err; + } tests[] = + { + { + /* Zero size. */ + .arg.inner.flags = O_RDONLY, + .size = 0, + .err = EINVAL, + }, + { + /* Normal struct. */ + .arg.inner.flags = O_RDONLY, + .size = sizeof (struct open_how), + }, + { + /* Larger struct, zeroed out the unused values. */ + .arg.inner.flags = O_RDONLY, + .size = sizeof (struct open_how_ext), + }, + { + /* Larger struct, non-zeroed out the unused values. */ + .arg.inner.flags = O_RDONLY, + .arg.extra1 = 0xdeadbeef, + .size = sizeof (struct open_how_ext), + .err = E2BIG, + }, + { + /* Larger struct, non-zeroed out the unused values. */ + .arg.inner.flags = O_RDONLY, + .arg.extra2 = 0xdeadbeef, + .size = sizeof (struct open_how_ext), + .err = E2BIG, + }, + }; + + for (struct struct_test *t = tests; t != array_end (tests); t++) + { + int fd = openat2 (AT_FDCWD, ".", (struct open_how *) &t->arg, t->size); + if (fd == -1 && errno == ENOSYS) + FAIL_UNSUPPORTED ("openat2 is not supported by the kernel"); + + if (t->err != 0) + { + TEST_COMPARE (fd, -1); + TEST_COMPARE (errno, t->err); + } + else + TEST_VERIFY (fd >= 0); + } + + return 0; +} + +static int +do_test_flags (void) +{ + static struct flag_test + { + struct open_how how; + int err; + } tests[] = + { + /* O_TMPFILE is incompatible with O_PATH and O_CREAT. */ + { .how.flags = O_TMPFILE | O_PATH | O_RDWR, .err = EINVAL }, + { .how.flags = O_TMPFILE | O_CREAT | O_RDWR, .err = EINVAL }, + + /* O_PATH only permits certain other flags to be set ... */ + { .how.flags = O_PATH | O_CLOEXEC }, + { .how.flags = O_PATH | O_DIRECTORY }, + { .how.flags = O_PATH | O_NOFOLLOW }, + /* ... and others are absolutely not permitted. */ + { .how.flags = O_PATH | O_RDWR, .err = EINVAL }, + { .how.flags = O_PATH | O_CREAT, .err = EINVAL }, + { .how.flags = O_PATH | O_EXCL, .err = EINVAL }, + { .how.flags = O_PATH | O_NOCTTY, .err = EINVAL }, + { .how.flags = O_PATH | O_DIRECT, .err = EINVAL }, + + /* ->mode must only be set with O_{CREAT,TMPFILE}. */ + { .how.flags = O_RDONLY, .how.mode = 0600, .err = EINVAL }, + { .how.flags = O_PATH, .how.mode = 0600, .err = EINVAL }, + { .how.flags = O_CREAT, .how.mode = 0600 }, + { .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0600 }, + /* ->mode must only contain 0777 bits. */ + { .how.flags = O_CREAT, .how.mode = 0xFFFF, .err = EINVAL }, + { .how.flags = O_CREAT, .how.mode = 0xC000000000000000ULL, .err = EINVAL }, + { .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0x1337, .err = EINVAL }, + { .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0x0000A00000000000ULL, + .err = EINVAL }, + + /* ->resolve flags must not conflict. */ + { .how.flags = O_RDONLY, + .how.resolve = RESOLVE_BENEATH | RESOLVE_IN_ROOT, + .err = EINVAL }, + + /* ->resolve must only contain RESOLVE_* flags. */ + { .how.flags = O_RDONLY, + .how.resolve = 0x1337, .err = EINVAL }, + { .how.flags = O_CREAT, + .how.resolve = 0x1337, .err = EINVAL }, + { .how.flags = O_TMPFILE | O_RDWR, + .how.resolve = 0x1337, .err = EINVAL }, + { .how.flags = O_PATH, + .how.resolve = 0x1337, .err = EINVAL }, + + /* currently unknown upper 32 bit rejected. */ + { .how.flags = O_RDONLY | (1ULL << 63), + .how.resolve = 0, .err = EINVAL }, + }; + + for (struct flag_test *t = tests; t != array_end (tests); t++) + { + char *path; + if (t->how.flags & O_CREAT) + { + int temp_fd = create_temp_file ("tst-openat2.", &path); + TEST_VERIFY_EXIT (temp_fd != -1); + xunlink (path); + } + else + path = (char *) "."; + + int fd = openat2 (AT_FDCWD, path, &t->how, sizeof (struct open_how)); + if (fd != 0 && errno == EOPNOTSUPP) + { + /* Skip the testcase if FS does not support the operation (e.g. + valid O_TMPFILE on NFS). */ + continue; + } + + if (t->err != 0) + { + TEST_COMPARE (fd, -1); + TEST_COMPARE (errno, t->err); + } + else + TEST_VERIFY (fd >= 0); + } + + return 0; +} + +static int +do_test_basic (void) +{ + int fd; + + fd = openat2 (dir_fd, + "some-file", + &(struct open_how) + { + .flags = O_CREAT|O_RDWR|O_EXCL, + .mode = 0666, + }, + sizeof (struct open_how)); + TEST_VERIFY (fd != -1); + + xwrite (fd, "hello", 5); + + /* Before closing the file, try using this file descriptor to open + another file. This must fail. */ + { + int fd2 = openat2 (fd, + "should-not-work", + &(struct open_how) + { + .flags = O_CREAT|O_RDWR|O_EXCL, + .mode = 0666, + }, + sizeof (struct open_how)); + TEST_COMPARE (fd2, -1); + TEST_COMPARE (errno, ENOTDIR); + } + + /* Remove the created file. */ + int cwdfd = xopen (".", O_RDONLY | O_DIRECTORY, 0); + TEST_COMPARE (fchdir (dir_fd), 0); + xunlink ("some-file"); + TEST_COMPARE (fchdir (cwdfd), 0); + + xclose (dir_fd); + xclose (cwdfd); + + fd = openat2 (dir_fd, + "some-file", + &(struct open_how) + { + .flags = O_CREAT|O_RDWR|O_EXCL, + .mode = 0666, + }, + sizeof (struct open_how)); + TEST_COMPARE (fd, -1); + TEST_COMPARE (errno, EBADF); + + return 0; +} + +static int +do_test (void) +{ + do_test_struct (); + do_test_flags (); + do_test_basic (); + + return 0; +} + +#include <support/test-driver.c> |