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/*
* Check decoding of openat2 syscall.
*
* Copyright (c) 2020-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <errno.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <linux/fcntl.h>
#ifndef VERBOSE
# define VERBOSE 0
#endif
#ifndef FD0_PATH
# define FD0_PATH ""
#else
# define YFLAG
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifdef YFLAG
# define AT_FDCWD_FMT "<%s>"
# define AT_FDCWD_ARG(arg) arg,
#else
# define AT_FDCWD_FMT
# define AT_FDCWD_ARG(arg)
#endif
static const char sample[] = "openat2.sample";
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
#ifdef YFLAG
char *cwd = get_fd_path(get_dir_fd("."));
#endif
long rc;
const char *rcstr;
TAIL_ALLOC_OBJECT_CONST_PTR(struct open_how, how);
struct open_how *how_big = tail_alloc(sizeof(*how_big) + 8);
rc = syscall(__NR_openat2, 0, NULL, NULL,
(kernel_ulong_t) 0xdeadc0debadc0dedULL);
printf("openat2(0" FD0_PATH ", NULL, NULL, %llu) = %s\n",
(unsigned long long) (kernel_ulong_t) 0xdeadc0debadc0dedULL,
sprintrc(rc));
rc = syscall(__NR_openat2, -100, "", how + 1, sizeof(*how));
printf("openat2(%s" AT_FDCWD_FMT ", \"\", %p, %zu) = %s\n",
XLAT_KNOWN(-100, "AT_FDCWD"),
AT_FDCWD_ARG(cwd)
how + 1, sizeof(*how),
sprintrc(rc));
rc = syscall(__NR_openat2, -1, sample, how, 11);
printf("openat2(-1, \"%s\", %p, 11) = %s\n", sample, how, sprintrc(rc));
static struct strval64 flags[] = {
{ ARG_STR(O_RDONLY|O_EXCL) },
{ ARG_STR(O_WRONLY|O_CREAT) },
{ ARG_STR(O_RDWR|O_LARGEFILE) },
{ ARG_STR(O_ACCMODE|O_TMPFILE) },
{ ARG_ULL_STR(O_RDONLY|0xdeadface80000000) },
};
static uint64_t modes[] = { 0, 0777, 0xbadc0dedfacebeefULL };
static struct strval64 resolve[] = {
{ 0, NULL },
{ ARG_STR(RESOLVE_NO_XDEV) },
{ ARG_ULL_STR(RESOLVE_NO_XDEV|RESOLVE_IN_ROOT|RESOLVE_CACHED|0xfeedfacedcaffec0) },
{ 0xdec0dedbeeffffc0, NULL },
};
const size_t iters = MAX(MAX(ARRAY_SIZE(flags), ARRAY_SIZE(modes)),
ARRAY_SIZE(resolve));
for (size_t i = 0; i < iters * 4; i++) {
how->flags = flags[i % ARRAY_SIZE(flags)].val;
how->mode = modes[i % ARRAY_SIZE(modes)];
how->resolve = resolve[i % ARRAY_SIZE(resolve)].val;
fill_memory(how_big + 1, 8);
memcpy(how_big, how, sizeof(*how));
for (size_t j = 0; j < 4; j++) {
rc = syscall(__NR_openat2, -1, sample,
j > 1 ? how_big : how,
j ? sizeof(*how) + 8 : sizeof(*how));
rcstr = sprintrc(rc);
printf("openat2(-1, \"%s\", {flags=%s",
sample,
sprintxlat(flags[i % ARRAY_SIZE(flags)].str,
flags[i % ARRAY_SIZE(flags)].val,
NULL));
if (how->mode || (i % ARRAY_SIZE(flags) == 1)
|| (i % ARRAY_SIZE(flags) == 3)) {
printf(", mode=%#03" PRIo64,
modes[i % ARRAY_SIZE(modes)]);
}
printf(", resolve=%s",
sprintxlat(resolve[i % ARRAY_SIZE(resolve)].str,
resolve[i % ARRAY_SIZE(resolve)].val,
resolve[i % ARRAY_SIZE(resolve)].val
? "RESOLVE_???" : NULL));
if (j == 1)
printf(", ???");
if (j == 2) {
printf(", /* bytes %zu..%zu */ \"\\x80\\x81"
"\\x82\\x83\\x84\\x85\\x86\\x87\"",
sizeof(*how), sizeof(*how) + 7);
}
printf("}, %zu) = %s\n",
j ? sizeof(*how) + 8 : sizeof(*how), rcstr);
if (j == 2)
memset(how_big + 1, 0, 8);
}
}
how->flags = O_RDONLY | O_NOCTTY;
how->mode = 0;
how->resolve = 0;
rc = syscall(__NR_openat2, -100, "/dev/full", how, sizeof(*how));
printf("openat2(%s" AT_FDCWD_FMT ", \"/dev/full\""
", {flags=%s, resolve=0}, %zu) = %s%s\n",
XLAT_KNOWN(-100, "AT_FDCWD"),
AT_FDCWD_ARG(cwd)
XLAT_STR(O_RDONLY|O_NOCTTY),
sizeof(*how), sprintrc(rc), rc >= 0 ? FD0_PATH : "");
puts("+++ exited with 0 +++");
return 0;
}
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