1 /* 2 * Check decoding of memfd_create syscall. 3 * 4 * Copyright (c) 2015-2017 Dmitry V. Levin <ldv (at) altlinux.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "tests.h" 31 #include <asm/unistd.h> 32 #include "scno.h" 33 34 #ifdef __NR_memfd_create 35 36 # include <stdio.h> 37 # include <stdint.h> 38 # include <unistd.h> 39 40 # ifdef HAVE_LINUX_MEMFD_H 41 # include <linux/memfd.h> 42 # endif 43 44 # ifndef MFD_HUGE_SHIFT 45 # define MFD_HUGE_SHIFT 26 46 # endif 47 48 # ifndef MFD_HUGE_MASK 49 # define MFD_HUGE_MASK 0x3f 50 # endif 51 52 static const char *errstr; 53 54 static long 55 k_memfd_create(const kernel_ulong_t name, const kernel_ulong_t flags) 56 { 57 const long rc = syscall(__NR_memfd_create, name, flags); 58 errstr = sprintrc(rc); 59 return rc; 60 } 61 62 int 63 main(void) 64 { 65 const size_t size = 255 - (sizeof("memfd:") - 1) + 1; 66 char *pattern = tail_alloc(size); 67 fill_memory_ex(pattern, size, '0', 10); 68 69 k_memfd_create((uintptr_t) pattern, 0); 70 printf("memfd_create(\"%.*s\"..., 0) = %s\n", 71 (int) size - 1, pattern, errstr); 72 73 kernel_ulong_t flags = (kernel_ulong_t) 0xfacefeed00000007ULL; 74 k_memfd_create((uintptr_t) pattern, flags); 75 printf("memfd_create(\"%.*s\"..., %s) = %s\n", 76 (int) size - 1, pattern, 77 "MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB", 78 errstr); 79 80 pattern[size - 1] = '\0'; 81 flags = 30 << MFD_HUGE_SHIFT; 82 k_memfd_create((uintptr_t) pattern, flags); 83 printf("memfd_create(\"%s\", 30<<MFD_HUGE_SHIFT) = %s\n", 84 pattern, errstr); 85 86 pattern += size - 1; 87 flags = (kernel_ulong_t) -1ULL; 88 k_memfd_create(0, flags); 89 flags = -1U & ~(7 | (MFD_HUGE_MASK << MFD_HUGE_SHIFT)); 90 printf("memfd_create(NULL, MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB" 91 "|%#x|%u<<MFD_HUGE_SHIFT) = %s\n", 92 (unsigned int) flags, MFD_HUGE_MASK, errstr); 93 94 puts("+++ exited with 0 +++"); 95 return 0; 96 } 97 98 #else 99 100 SKIP_MAIN_UNDEFINED("__NR_memfd_create") 101 102 #endif 103
