1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2003-2016 Dmitry V. Levin <ldv@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
SYS_FUNC(getuid)72 SYS_FUNC(getuid)
73 {
74 return RVAL_UDECIMAL | RVAL_DECODED;
75 }
76
SYS_FUNC(setfsuid)77 SYS_FUNC(setfsuid)
78 {
79 printuid("", tcp->u_arg[0]);
80
81 return RVAL_UDECIMAL | RVAL_DECODED;
82 }
83
SYS_FUNC(setuid)84 SYS_FUNC(setuid)
85 {
86 printuid("", tcp->u_arg[0]);
87
88 return RVAL_DECODED;
89 }
90
91 static void
get_print_uid(struct tcb * const tcp,const char * const prefix,const kernel_ulong_t addr)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
SYS_FUNC(getresuid)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
SYS_FUNC(setreuid)116 SYS_FUNC(setreuid)
117 {
118 printuid("", tcp->u_arg[0]);
119 printuid(", ", tcp->u_arg[1]);
120
121 return RVAL_DECODED;
122 }
123
SYS_FUNC(setresuid)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
SYS_FUNC(chown)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
SYS_FUNC(fchown)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
printuid(const char * text,const unsigned int uid)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
print_gid(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)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
print_groups(struct tcb * const tcp,const unsigned int len,const kernel_ulong_t addr)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
SYS_FUNC(setgroups)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
SYS_FUNC(getgroups)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