1 /* 2 * Check decoding of remap_file_pages syscall. 3 * 4 * Copyright (c) 2016-2017 Dmitry V. Levin <ldv@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 33 #ifdef __NR_remap_file_pages 34 35 # include <stdio.h> 36 # include <stdint.h> 37 # include <unistd.h> 38 # include <linux/mman.h> 39 40 static const char *errstr; 41 42 static long 43 k_remap_file_pages(const kernel_ulong_t addr, 44 const kernel_ulong_t size, 45 const kernel_ulong_t prot, 46 const kernel_ulong_t pgoff, 47 const kernel_ulong_t flags) 48 { 49 const long rc = syscall(__NR_remap_file_pages, 50 addr, size, prot, pgoff, flags); 51 errstr = sprintrc(rc); 52 return rc; 53 } 54 55 int 56 main(void) 57 { 58 kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL; 59 kernel_ulong_t size = (kernel_ulong_t) 0xdefaced1bad2f00dULL; 60 kernel_ulong_t prot = PROT_READ|PROT_WRITE|PROT_EXEC; 61 kernel_ulong_t pgoff = (kernel_ulong_t) 0xcaf3babebad4deedULL; 62 kernel_ulong_t flags = MAP_PRIVATE|MAP_ANONYMOUS; 63 64 k_remap_file_pages(addr, size, prot, pgoff, flags); 65 printf("remap_file_pages(%#jx, %ju, %s, %ju, %s) = %s\n", 66 (uintmax_t) addr, (uintmax_t) size, 67 "PROT_READ|PROT_WRITE|PROT_EXEC", 68 (uintmax_t) pgoff, "MAP_PRIVATE|MAP_ANONYMOUS", errstr); 69 70 #ifdef MAP_HUGETLB 71 # ifndef MAP_HUGE_2MB 72 # ifndef MAP_HUGE_SHIFT 73 # define MAP_HUGE_SHIFT 26 74 # endif 75 # define MAP_HUGE_2MB (21 << MAP_HUGE_SHIFT) 76 # endif /* !MAP_HUGE_2MB */ 77 addr = (kernel_ulong_t) 0xfacefeeddeadf00dULL; 78 size = (kernel_ulong_t) 0xdefaced1bad2beefULL; 79 prot = (kernel_ulong_t) 0xdefaced00000000ULL | PROT_NONE; 80 flags = MAP_TYPE | MAP_FIXED | MAP_NORESERVE | MAP_HUGETLB | MAP_HUGE_2MB; 81 82 k_remap_file_pages(addr, size, prot, pgoff, flags); 83 printf("remap_file_pages(%#jx, %ju, %s, %ju" 84 ", %#x /* MAP_??? */" 85 "|MAP_FIXED|MAP_NORESERVE|MAP_HUGETLB|21<<MAP_HUGE_SHIFT)" 86 " = %s\n", 87 (uintmax_t) addr, (uintmax_t) size, 88 prot == PROT_NONE ? "PROT_NONE" : 89 "0xdefaced00000000 /* PROT_??? */", 90 (uintmax_t) pgoff, MAP_TYPE, errstr); 91 #endif /* MAP_HUGETLB */ 92 93 puts("+++ exited with 0 +++"); 94 return 0; 95 } 96 97 #else 98 99 SKIP_MAIN_UNDEFINED("__NR_remap_file_pages") 100 101 #endif 102