1 /* 2 * Check decoding of "old mmap" edition of mmap syscall. 3 * 4 * Copyright (c) 2016 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 33 /* 34 * On s390x and m68k, this is the mmap syscall used by glibc, so, 35 * from one side, it's already covered by another test, and, from another side, 36 * it would require additional efforts to filter out mmap calls made by glibc. 37 */ 38 39 #if defined __NR_mmap && \ 40 ( defined __arm__ \ 41 || defined __i386__ \ 42 || (defined __s390__ && !defined __s390x__) \ 43 ) 44 45 # include <stdio.h> 46 # include <string.h> 47 # include <sys/mman.h> 48 # include <unistd.h> 49 50 int 51 main(void) 52 { 53 long rc = syscall(__NR_mmap, 0); 54 printf("mmap(NULL) = %ld %s (%m)\n", rc, errno2name()); 55 56 const unsigned int args1_c[6] = { 57 0xdeadbeef, /* addr */ 58 0xfacefeed, /* len */ 59 PROT_READ|PROT_EXEC, /* prot */ 60 MAP_FILE|MAP_FIXED, /* flags */ 61 -2U, /* fd */ 62 0xbadc0ded /* offset */ 63 }; 64 const unsigned int page_size = get_page_size(); 65 const unsigned int args2_c[6] = { 66 0, 67 page_size, 68 PROT_READ|PROT_WRITE, 69 MAP_PRIVATE|MAP_ANONYMOUS, 70 -1U, 71 0xfaced000 & -page_size 72 }; 73 void *args = tail_memdup(args1_c, sizeof(args1_c)); 74 75 rc = syscall(__NR_mmap, args); 76 printf("mmap(%#x, %u, PROT_READ|PROT_EXEC, MAP_FILE|MAP_FIXED" 77 ", %d, %#x) = %ld %s (%m)\n", 78 args1_c[0], args1_c[1], args1_c[4], args1_c[5], 79 rc, errno2name()); 80 81 memcpy(args, args2_c, sizeof(args2_c)); 82 rc = syscall(__NR_mmap, args); 83 printf("mmap(NULL, %u, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS" 84 ", %d, %#x) = %#lx\n", 85 args2_c[1], args2_c[4], args2_c[5], rc); 86 87 void *addr = (void *) rc; 88 if (mprotect(addr, page_size, PROT_NONE)) 89 perror_msg_and_fail("mprotect(%p, %u, PROT_NONE)", 90 addr, page_size); 91 92 puts("+++ exited with 0 +++"); 93 return 0; 94 } 95 96 #else 97 98 SKIP_MAIN_UNDEFINED("__NR_mmap && (__arm__ || __i386__" 99 " || (__s390__ && !__s390x__))") 100 101 #endif 102
