1 /* 2 * Check decoding of getgroups/getgroups32 syscalls. 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 #ifdef __NR_getgroups32 31 32 # define SYSCALL_NR __NR_getgroups32 33 # define SYSCALL_NAME "getgroups32" 34 # define GID_TYPE unsigned int 35 36 #else 37 38 # include "tests.h" 39 # include <asm/unistd.h> 40 41 # ifdef __NR_getgroups 42 43 # define SYSCALL_NR __NR_getgroups 44 # define SYSCALL_NAME "getgroups" 45 # if defined __NR_getgroups32 && __NR_getgroups != __NR_getgroups32 46 # define GID_TYPE unsigned short 47 # else 48 # define GID_TYPE unsigned int 49 # endif 50 51 # endif 52 53 #endif 54 55 #ifdef GID_TYPE 56 57 # include <stdio.h> 58 # include <unistd.h> 59 60 #define MAX_STRLEN 32 61 static long ngroups; 62 63 static void 64 get_groups(const long size, GID_TYPE *const g) 65 { 66 long i = syscall(SYSCALL_NR, size, g); 67 if (i != ngroups) 68 perror_msg_and_fail("%s(%#lx, %p)", SYSCALL_NAME, size, g); 69 70 printf("%s(%d, [", SYSCALL_NAME, (int) size); 71 for (i = 0; i < ngroups; ++i) { 72 if (i) 73 printf(", "); 74 if (i >= MAX_STRLEN) { 75 printf("..."); 76 break; 77 } 78 printf("%u", (unsigned int) g[i]); 79 } 80 printf("]) = %ld\n", ngroups); 81 } 82 83 int 84 main(void) 85 { 86 long rc; 87 88 /* check how the first argument is decoded */ 89 ngroups = syscall(SYSCALL_NR, 0, 0); 90 printf("%s(0, NULL) = %ld\n", SYSCALL_NAME, ngroups); 91 if (ngroups < 0) 92 perror_msg_and_fail(SYSCALL_NAME); 93 94 rc = syscall(SYSCALL_NR, (long) 0xffffffff00000000ULL, 0); 95 printf("%s(0, NULL) = %ld\n", SYSCALL_NAME, rc); 96 97 rc = syscall(SYSCALL_NR, -1U, 0); 98 printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc)); 99 100 rc = syscall(SYSCALL_NR, -1L, 0); 101 printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc)); 102 103 const unsigned int ngroups_max = sysconf(_SC_NGROUPS_MAX); 104 105 rc = syscall(SYSCALL_NR, ngroups_max, 0); 106 printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, ngroups_max, sprintrc(rc)); 107 108 rc = syscall(SYSCALL_NR, (long) 0xffffffff00000000ULL | ngroups_max, 0); 109 printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, ngroups_max, sprintrc(rc)); 110 111 /* check how the second argument is decoded */ 112 GID_TYPE *const g1 = 113 tail_alloc(ngroups ? sizeof(*g1) * ngroups : 1); 114 GID_TYPE *const g2 = tail_alloc(sizeof(*g2) * (ngroups + 1)); 115 void *efault = g2 + ngroups + 1; 116 117 get_groups(ngroups, g1); 118 get_groups(ngroups + 1, g1); 119 get_groups(ngroups + 1, g2); 120 121 if (ngroups) { 122 rc = syscall(SYSCALL_NR, ngroups, efault); 123 printf("%s(%d, %p) = %s\n", 124 SYSCALL_NAME, (unsigned) ngroups, efault, sprintrc(rc)); 125 } 126 127 puts("+++ exited with 0 +++"); 128 return 0; 129 } 130 131 #else 132 133 SKIP_MAIN_UNDEFINED("__NR_getgroups") 134 135 #endif 136
