1 /* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk (at) cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko (at) hacktic.nl> 4 * Copyright (c) 1993-1996 Rick Sladkey <jrs (at) world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl> 6 * Copyright (c) 2003-2016 Dmitry V. Levin <ldv (at) altlinux.org> 7 * Copyright (c) 2014-2018 The strace developers. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef STRACE_UID_SIZE 34 # if STRACE_UID_SIZE != 16 35 # error invalid STRACE_UID_SIZE 36 # endif 37 38 # define SIZEIFY(x) SIZEIFY_(x, STRACE_UID_SIZE) 39 # define SIZEIFY_(x, size) SIZEIFY__(x, size) 40 # define SIZEIFY__(x, size) x ## size 41 42 # define printuid SIZEIFY(printuid) 43 # define sys_chown SIZEIFY(sys_chown) 44 # define sys_fchown SIZEIFY(sys_fchown) 45 # define sys_getgroups SIZEIFY(sys_getgroups) 46 # define sys_getresuid SIZEIFY(sys_getresuid) 47 # define sys_getuid SIZEIFY(sys_getuid) 48 # define sys_setfsuid SIZEIFY(sys_setfsuid) 49 # define sys_setgroups SIZEIFY(sys_setgroups) 50 # define sys_setresuid SIZEIFY(sys_setresuid) 51 # define sys_setreuid SIZEIFY(sys_setreuid) 52 # define sys_setuid SIZEIFY(sys_setuid) 53 #endif /* STRACE_UID_SIZE */ 54 55 #include "defs.h" 56 57 #ifdef STRACE_UID_SIZE 58 # if !HAVE_ARCH_UID16_SYSCALLS 59 # undef STRACE_UID_SIZE 60 # endif 61 #else 62 # define STRACE_UID_SIZE 32 63 #endif 64 65 #ifdef STRACE_UID_SIZE 66 67 # undef uid_t 68 # define uid_t uid_t_(STRACE_UID_SIZE) 69 # define uid_t_(size) uid_t__(size) 70 # define uid_t__(size) uint ## size ## _t 71 72 SYS_FUNC(getuid) 73 { 74 return RVAL_UDECIMAL | RVAL_DECODED; 75 } 76 77 SYS_FUNC(setfsuid) 78 { 79 printuid("", tcp->u_arg[0]); 80 81 return RVAL_UDECIMAL | RVAL_DECODED; 82 } 83 84 SYS_FUNC(setuid) 85 { 86 printuid("", tcp->u_arg[0]); 87 88 return RVAL_DECODED; 89 } 90 91 static void 92 get_print_uid(struct tcb *const tcp, const char *const prefix, 93 const kernel_ulong_t addr) 94 { 95 uid_t uid; 96 97 tprints(prefix); 98 if (!umove_or_printaddr(tcp, addr, &uid)) { 99 printuid("[", uid); 100 tprints("]"); 101 } 102 } 103 104 SYS_FUNC(getresuid) 105 { 106 if (entering(tcp)) 107 return 0; 108 109 get_print_uid(tcp, "", tcp->u_arg[0]); 110 get_print_uid(tcp, ", ", tcp->u_arg[1]); 111 get_print_uid(tcp, ", ", tcp->u_arg[2]); 112 113 return 0; 114 } 115 116 SYS_FUNC(setreuid) 117 { 118 printuid("", tcp->u_arg[0]); 119 printuid(", ", tcp->u_arg[1]); 120 121 return RVAL_DECODED; 122 } 123 124 SYS_FUNC(setresuid) 125 { 126 printuid("", tcp->u_arg[0]); 127 printuid(", ", tcp->u_arg[1]); 128 printuid(", ", tcp->u_arg[2]); 129 130 return RVAL_DECODED; 131 } 132 133 SYS_FUNC(chown) 134 { 135 printpath(tcp, tcp->u_arg[0]); 136 printuid(", ", tcp->u_arg[1]); 137 printuid(", ", tcp->u_arg[2]); 138 139 return RVAL_DECODED; 140 } 141 142 SYS_FUNC(fchown) 143 { 144 printfd(tcp, tcp->u_arg[0]); 145 printuid(", ", tcp->u_arg[1]); 146 printuid(", ", tcp->u_arg[2]); 147 148 return RVAL_DECODED; 149 } 150 151 void 152 printuid(const char *text, const unsigned int uid) 153 { 154 if ((uid_t) -1U == (uid_t) uid) 155 tprintf("%s-1", text); 156 else 157 tprintf("%s%u", text, (uid_t) uid); 158 } 159 160 static bool 161 print_gid(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data) 162 { 163 printuid("", (*(uid_t *) elem_buf)); 164 165 return true; 166 } 167 168 static void 169 print_groups(struct tcb *const tcp, const unsigned int len, 170 const kernel_ulong_t addr) 171 { 172 static unsigned long ngroups_max; 173 if (!ngroups_max) 174 ngroups_max = sysconf(_SC_NGROUPS_MAX); 175 176 if (len > ngroups_max) { 177 printaddr(addr); 178 return; 179 } 180 181 uid_t gid; 182 print_array(tcp, addr, len, &gid, sizeof(gid), 183 umoven_or_printaddr, print_gid, 0); 184 } 185 186 SYS_FUNC(setgroups) 187 { 188 const int len = tcp->u_arg[0]; 189 190 tprintf("%d, ", len); 191 print_groups(tcp, len, tcp->u_arg[1]); 192 return RVAL_DECODED; 193 } 194 195 SYS_FUNC(getgroups) 196 { 197 if (entering(tcp)) 198 tprintf("%d, ", (int) tcp->u_arg[0]); 199 else 200 print_groups(tcp, tcp->u_rval, tcp->u_arg[1]); 201 return 0; 202 } 203 204 #endif /* STRACE_UID_SIZE */ 205
