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/*
* Copyright (c) 2016 Katerina Koukiou <k.koukiou@gmail.com>
* Copyright (c) 2016-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_openat
# include <asm/fcntl.h>
# include <stdio.h>
# include <unistd.h>
# include "secontext.h"
# ifdef O_TMPFILE
/* The kernel & C libraries often inline O_DIRECTORY. */
# define STRACE_O_TMPFILE (O_TMPFILE & ~O_DIRECTORY)
# else
# define STRACE_O_TMPFILE 0
# endif
static const char sample[] = "openat.sample";
static void
test_mode_flag(unsigned int mode_val, const char *mode_str,
unsigned int flag_val, const char *flag_str,
const char *my_secontext)
{
long rc = syscall(__NR_openat, -1, sample, mode_val | flag_val, 0);
printf("%s%s(-1, \"%s\", %s%s%s%s) = %s\n",
my_secontext, "openat",
sample, mode_str,
flag_val ? "|" : "", flag_str,
flag_val & (O_CREAT | STRACE_O_TMPFILE) ? ", 000" : "",
sprintrc(rc));
}
int
main(void)
{
/*
* Make sure the current workdir of the tracee
* is different from the current workdir of the tracer.
*/
create_and_enter_subdir("openat_subdir");
char *my_secontext = SECONTEXT_PID_MY();
static const struct strval32 modes[] = {
{ ARG_STR(O_RDONLY) },
{ ARG_STR(O_WRONLY) },
{ ARG_STR(O_RDWR) },
{ ARG_STR(O_ACCMODE) }
}, flags[] = {
{ ARG_STR(O_APPEND) },
{ ARG_STR(O_DIRECT) },
{ ARG_STR(O_DIRECTORY) },
{ ARG_STR(O_EXCL) },
{ ARG_STR(O_LARGEFILE) },
{ ARG_STR(O_NOATIME) },
{ ARG_STR(O_NOCTTY) },
{ ARG_STR(O_NOFOLLOW) },
{ ARG_STR(O_NONBLOCK) },
{ ARG_STR(O_SYNC) },
{ ARG_STR(O_TRUNC) },
{ ARG_STR(O_CREAT) },
# ifdef O_CLOEXEC
{ ARG_STR(O_CLOEXEC) },
# endif
# ifdef O_DSYNC
{ ARG_STR(O_DSYNC) },
# endif
# ifdef __O_SYNC
{ ARG_STR(__O_SYNC) },
# endif
# ifdef O_PATH
{ ARG_STR(O_PATH) },
# endif
# ifdef O_TMPFILE
{ ARG_STR(O_TMPFILE) },
# endif
# ifdef __O_TMPFILE
{ ARG_STR(__O_TMPFILE) },
# endif
{ ARG_STR(0x80000000) },
{ 0, "" }
};
for (unsigned int m = 0; m < ARRAY_SIZE(modes); ++m)
for (unsigned int f = 0; f < ARRAY_SIZE(flags); ++f)
test_mode_flag(modes[m].val, modes[m].str,
flags[f].val, flags[f].str,
my_secontext);
/*
* Tests with AT_FDCWD.
*/
(void) unlink(sample);
long fd = syscall(__NR_openat, -100, sample, O_RDONLY|O_CREAT, 0400);
char *sample_secontext = SECONTEXT_FILE(sample);
/*
* File context in openat() is not displayed because file doesn't exist
* yet, but is displayed in return value since the file got created.
*/
printf("%s%s(AT_FDCWD, \"%s\", O_RDONLY|O_CREAT, 0400) = %s%s\n",
my_secontext, "openat",
sample,
sprintrc(fd), sample_secontext);
close(fd);
fd = syscall(__NR_openat, -100, sample, O_RDONLY);
printf("%s%s(AT_FDCWD, \"%s\"%s, O_RDONLY) = %s%s\n",
my_secontext, "openat",
sample, sample_secontext,
sprintrc(fd), sample_secontext);
if (fd != -1) {
close(fd);
if (unlink(sample))
perror_msg_and_fail("unlink");
}
/*
* Tests with dirfd.
*/
int cwd_fd = get_dir_fd(".");
char *cwd_secontext = SECONTEXT_FILE(".");
fd = syscall(__NR_openat, cwd_fd, sample, O_RDONLY|O_CREAT, 0400);
if (fd == -1)
perror_msg_and_fail("openat");
close(fd);
/*
* File context in openat() is not displayed because file doesn't exist
* yet, but is displayed in return value since the file got created.
*/
printf("%s%s(%d%s, \"%s\", O_RDONLY|O_CREAT, 0400) = %s%s\n",
my_secontext, "openat",
cwd_fd, cwd_secontext,
sample,
sprintrc(fd), sample_secontext);
fd = syscall(__NR_openat, cwd_fd, sample, O_RDONLY);
printf("%s%s(%d%s, \"%s\"%s, O_RDONLY) = %s%s\n",
my_secontext, "openat",
cwd_fd, cwd_secontext,
sample, sample_secontext,
sprintrc(fd), sample_secontext);
if (fd != -1) {
close(fd);
if (unlink(sample))
perror_msg_and_fail("unlink");
}
leave_and_remove_subdir();
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_openat")
#endif
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