1  /*
       2   * Check decoding of memfd_create syscall.
       3   *
       4   * Copyright (c) 2015-2018 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2015-2023 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include "tests.h"
      12  #include "scno.h"
      13  
      14  #include <stdio.h>
      15  #include <stdint.h>
      16  #include <unistd.h>
      17  #include <linux/memfd.h>
      18  
      19  static const char *errstr;
      20  
      21  static long
      22  k_memfd_create(const kernel_ulong_t name, const kernel_ulong_t flags)
      23  {
      24  	const long rc = syscall(__NR_memfd_create, name, flags);
      25  	errstr = sprintrc(rc);
      26  	return rc;
      27  }
      28  
      29  int
      30  main(void)
      31  {
      32  	const size_t size = 255 - (sizeof("memfd:") - 1) + 1;
      33  	char *pattern = tail_alloc(size);
      34  	fill_memory_ex(pattern, size, '0', 10);
      35  
      36  	k_memfd_create((uintptr_t) pattern, 0);
      37  	printf("memfd_create(\"%.*s\"..., 0) = %s\n",
      38  	       (int) size, pattern, errstr);
      39  
      40  	kernel_ulong_t flags = (kernel_ulong_t) 0xfacefeed0000001fULL;
      41  #define flags1_str \
      42  	"MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB|MFD_NOEXEC_SEAL|MFD_EXEC"
      43  
      44  	k_memfd_create((uintptr_t) pattern, flags);
      45  #if XLAT_VERBOSE
      46  	printf("memfd_create(\"%.*s\"..., %s /* %s */) = %s\n",
      47  	       (int) size, pattern,
      48  	       "0x1f", flags1_str, errstr);
      49  #else
      50  	printf("memfd_create(\"%.*s\"..., %s) = %s\n",
      51  	       (int) size, pattern,
      52  # if XLAT_RAW
      53  	       "0x1f",
      54  # else
      55  	       flags1_str,
      56  # endif
      57  	       errstr);
      58  #endif
      59  
      60  	pattern[size - 1] = '\0';
      61  	flags = 30 << MFD_HUGE_SHIFT;
      62  	k_memfd_create((uintptr_t) pattern, flags);
      63  #if XLAT_RAW
      64  	printf("memfd_create(\"%s\", %#x) = %s\n",
      65  	       pattern, (unsigned int) flags, errstr);
      66  #elif XLAT_VERBOSE
      67  	printf("memfd_create(\"%s\", %#x /* %s */) = %s\n",
      68  	       pattern, (unsigned int) flags, "30<<MFD_HUGE_SHIFT", errstr);
      69  #else /* XLAT_ABBREV */
      70  	printf("memfd_create(\"%s\", 30<<MFD_HUGE_SHIFT) = %s\n",
      71  	       pattern, errstr);
      72  #endif
      73  
      74  	flags = (kernel_ulong_t) -1ULL;
      75  	k_memfd_create(0, flags);
      76  	flags = -1U & ~(0x1f | (MFD_HUGE_MASK << MFD_HUGE_SHIFT));
      77  
      78  #define memfd_create_fmt "%s|%#x|%u<<MFD_HUGE_SHIFT"
      79  
      80  	printf("memfd_create(NULL, "
      81  #if XLAT_RAW
      82  	       "0xffffffff) = %s\n",
      83  #else
      84  # if XLAT_VERBOSE
      85  	       "0xffffffff /* " memfd_create_fmt " */"
      86  # else /* XLAT_ABBREV */
      87  	       memfd_create_fmt
      88  # endif
      89  	       ") = %s\n",
      90  	       flags1_str, (unsigned int) flags, MFD_HUGE_MASK,
      91  #endif
      92  	       errstr);
      93  
      94  	puts("+++ exited with 0 +++");
      95  	return 0;
      96  }