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/*
* Check decoding of memfd_secret syscall.
*
* Copyright (c) 2021 Eugene Syromyatnikov <evgsyr@gmail.com>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "kernel_fcntl.h"
#include "scno.h"
#include <inttypes.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#ifndef RETVAL_INJECTED
# define RETVAL_INJECTED 0
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifndef FD_PATH
# define FD_PATH ""
#endif
#if RETVAL_INJECTED
# define INJ_STR " (INJECTED)\n"
# define INJ_FD_STR FD_PATH " (INJECTED)\n"
#else /* !RETVAL_INJECTED */
# define INJ_STR "\n"
# define INJ_FD_STR "\n"
#endif /* RETVAL_INJECTED */
static const char *errstr;
static long
sys_memfd_secret(unsigned int flags)
{
static const kernel_ulong_t fill =
(kernel_ulong_t) 0xbeefcafe00000000ULL;
kernel_ulong_t arg1 = fill | flags;
kernel_ulong_t arg2 = fill | 0xdefaeced;
kernel_ulong_t arg3 = fill | 0xbabefeed;
kernel_ulong_t arg4 = fill | 0xbadbeefd;
kernel_ulong_t arg5 = fill | 0xdecaffed;
kernel_ulong_t arg6 = fill | 0xdeefaced;
long rc = syscall(__NR_memfd_secret,
arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
static const struct {
int val;
const char *str;
} flags_vals[] = {
{ ARG_STR(0) },
{ ARG_STR(O_CLOEXEC) },
/* O_CLOEXEC is either 0x80000, 0x200000, or 0x400000 */
{ ARG_STR(0xde97face) },
{ ARG_STR(O_CLOEXEC|0xde97face) },
};
for (size_t i = 0; i < ARRAY_SIZE(flags_vals); i++) {
long rc = sys_memfd_secret(flags_vals[i].val);
printf("memfd_secret(%s) = %s%s" INJ_STR,
flags_vals[i].str, errstr, rc > 0 ? FD_PATH : "");
}
puts("+++ exited with 0 +++");
return 0;
}
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