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 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef STRACE_UID_SIZE
33 # if STRACE_UID_SIZE != 16
34 # error invalid STRACE_UID_SIZE
35 # endif
36
37 # define SIZEIFY(x) SIZEIFY_(x, STRACE_UID_SIZE)
38 # define SIZEIFY_(x, size) SIZEIFY__(x, size)
39 # define SIZEIFY__(x, size) x ## size
40
41 # define printuid SIZEIFY(printuid)
42 # define sys_chown SIZEIFY(sys_chown)
43 # define sys_fchown SIZEIFY(sys_fchown)
44 # define sys_getgroups SIZEIFY(sys_getgroups)
45 # define sys_getresuid SIZEIFY(sys_getresuid)
46 # define sys_getuid SIZEIFY(sys_getuid)
47 # define sys_setfsuid SIZEIFY(sys_setfsuid)
48 # define sys_setgroups SIZEIFY(sys_setgroups)
49 # define sys_setresuid SIZEIFY(sys_setresuid)
50 # define sys_setreuid SIZEIFY(sys_setreuid)
51 # define sys_setuid SIZEIFY(sys_setuid)
52 #endif /* STRACE_UID_SIZE */
53
54 #include "defs.h"
55
56 #ifdef STRACE_UID_SIZE
57 # if !NEED_UID16_PARSERS
58 # undef STRACE_UID_SIZE
59 # endif
60 #else
61 # define STRACE_UID_SIZE 32
62 #endif
63
64 #ifdef STRACE_UID_SIZE
65
66 # undef uid_t
67 # define uid_t uid_t_(STRACE_UID_SIZE)
68 # define uid_t_(size) uid_t__(size)
69 # define uid_t__(size) uint ## size ## _t
70
SYS_FUNC(getuid)71 SYS_FUNC(getuid)
72 {
73 return RVAL_UDECIMAL | RVAL_DECODED;
74 }
75
SYS_FUNC(setfsuid)76 SYS_FUNC(setfsuid)
77 {
78 printuid("", tcp->u_arg[0]);
79
80 return RVAL_UDECIMAL | RVAL_DECODED;
81 }
82
SYS_FUNC(setuid)83 SYS_FUNC(setuid)
84 {
85 printuid("", tcp->u_arg[0]);
86
87 return RVAL_DECODED;
88 }
89
90 static void
get_print_uid(struct tcb * const tcp,const char * const prefix,const kernel_ulong_t addr)91 get_print_uid(struct tcb *const tcp, const char *const prefix,
92 const kernel_ulong_t addr)
93 {
94 uid_t uid;
95
96 tprints(prefix);
97 if (!umove_or_printaddr(tcp, addr, &uid)) {
98 printuid("[", uid);
99 tprints("]");
100 }
101 }
102
SYS_FUNC(getresuid)103 SYS_FUNC(getresuid)
104 {
105 if (entering(tcp))
106 return 0;
107
108 get_print_uid(tcp, "", tcp->u_arg[0]);
109 get_print_uid(tcp, ", ", tcp->u_arg[1]);
110 get_print_uid(tcp, ", ", tcp->u_arg[2]);
111
112 return 0;
113 }
114
SYS_FUNC(setreuid)115 SYS_FUNC(setreuid)
116 {
117 printuid("", tcp->u_arg[0]);
118 printuid(", ", tcp->u_arg[1]);
119
120 return RVAL_DECODED;
121 }
122
SYS_FUNC(setresuid)123 SYS_FUNC(setresuid)
124 {
125 printuid("", tcp->u_arg[0]);
126 printuid(", ", tcp->u_arg[1]);
127 printuid(", ", tcp->u_arg[2]);
128
129 return RVAL_DECODED;
130 }
131
SYS_FUNC(chown)132 SYS_FUNC(chown)
133 {
134 printpath(tcp, tcp->u_arg[0]);
135 printuid(", ", tcp->u_arg[1]);
136 printuid(", ", tcp->u_arg[2]);
137
138 return RVAL_DECODED;
139 }
140
SYS_FUNC(fchown)141 SYS_FUNC(fchown)
142 {
143 printfd(tcp, tcp->u_arg[0]);
144 printuid(", ", tcp->u_arg[1]);
145 printuid(", ", tcp->u_arg[2]);
146
147 return RVAL_DECODED;
148 }
149
150 void
printuid(const char * text,const unsigned int uid)151 printuid(const char *text, const unsigned int uid)
152 {
153 if ((uid_t) -1U == (uid_t) uid)
154 tprintf("%s-1", text);
155 else
156 tprintf("%s%u", text, (uid_t) uid);
157 }
158
159 static bool
print_gid(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)160 print_gid(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
161 {
162 printuid("", (*(uid_t *) elem_buf));
163
164 return true;
165 }
166
167 static void
print_groups(struct tcb * const tcp,const unsigned int len,const kernel_ulong_t addr)168 print_groups(struct tcb *const tcp, const unsigned int len,
169 const kernel_ulong_t addr)
170 {
171 static unsigned long ngroups_max;
172 if (!ngroups_max)
173 ngroups_max = sysconf(_SC_NGROUPS_MAX);
174
175 if (len > ngroups_max) {
176 printaddr(addr);
177 return;
178 }
179
180 uid_t gid;
181 print_array(tcp, addr, len, &gid, sizeof(gid),
182 umoven_or_printaddr, print_gid, 0);
183 }
184
SYS_FUNC(setgroups)185 SYS_FUNC(setgroups)
186 {
187 const int len = tcp->u_arg[0];
188
189 tprintf("%d, ", len);
190 print_groups(tcp, len, tcp->u_arg[1]);
191 return RVAL_DECODED;
192 }
193
SYS_FUNC(getgroups)194 SYS_FUNC(getgroups)
195 {
196 if (entering(tcp))
197 tprintf("%d, ", (int) tcp->u_arg[0]);
198 else
199 print_groups(tcp, tcp->u_rval, tcp->u_arg[1]);
200 return 0;
201 }
202
203 #endif /* STRACE_UID_SIZE */
204