1 /*
2 * Copyright (c) 2000 Wichert Akkerman <wakkerma@debian.org>
3 * Copyright (c) 2011 Denys Vlasenko <dvlasenk@redhat.com>
4 * Copyright (c) 2005-2015 Dmitry V. Levin <ldv@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 "defs.h"
31
32 /* these constants are the same as in <linux/capability.h> */
33 enum {
34 #include "caps0.h"
35 };
36
37 #include "xlat/cap_mask0.h"
38
39 /* these constants are CAP_TO_INDEX'ed constants from <linux/capability.h> */
40 enum {
41 #include "caps1.h"
42 };
43
44 #include "xlat/cap_mask1.h"
45
46 /* these constants are the same as in <linux/capability.h> */
47 enum {
48 _LINUX_CAPABILITY_VERSION_1 = 0x19980330,
49 _LINUX_CAPABILITY_VERSION_2 = 0x20071026,
50 _LINUX_CAPABILITY_VERSION_3 = 0x20080522
51 };
52
53 #include "xlat/cap_version.h"
54
55 struct user_cap_header_struct {
56 uint32_t version;
57 int pid;
58 };
59
60 struct user_cap_data_struct {
61 uint32_t effective;
62 uint32_t permitted;
63 uint32_t inheritable;
64 };
65
66 static const struct user_cap_header_struct *
get_cap_header(struct tcb * const tcp,const kernel_ulong_t addr)67 get_cap_header(struct tcb *const tcp, const kernel_ulong_t addr)
68 {
69 static struct user_cap_header_struct header;
70
71 if (!addr || !verbose(tcp))
72 return NULL;
73
74 if (umove(tcp, addr, &header) < 0)
75 return NULL;
76
77 return &header;
78 }
79
80 static void
print_cap_header(struct tcb * const tcp,const kernel_ulong_t addr,const struct user_cap_header_struct * const h)81 print_cap_header(struct tcb *const tcp, const kernel_ulong_t addr,
82 const struct user_cap_header_struct *const h)
83 {
84 if (!addr || !h) {
85 printaddr(addr);
86 return;
87 }
88
89 tprints("{version=");
90 printxval(cap_version, h->version,
91 "_LINUX_CAPABILITY_VERSION_???");
92 tprintf(", pid=%d}", h->pid);
93 }
94
95 static void
print_cap_bits(const uint32_t lo,const uint32_t hi)96 print_cap_bits(const uint32_t lo, const uint32_t hi)
97 {
98 if (lo || !hi)
99 printflags(cap_mask0, lo, "CAP_???");
100
101 if (hi) {
102 if (lo)
103 tprints("|");
104 printflags(cap_mask1, hi, "CAP_???");
105 }
106 }
107
108 static void
print_cap_data(struct tcb * const tcp,const kernel_ulong_t addr,const struct user_cap_header_struct * const h)109 print_cap_data(struct tcb *const tcp, const kernel_ulong_t addr,
110 const struct user_cap_header_struct *const h)
111 {
112 struct user_cap_data_struct data[2];
113 unsigned int len;
114
115 if (!addr || !h) {
116 printaddr(addr);
117 return;
118 }
119
120 if (_LINUX_CAPABILITY_VERSION_2 == h->version ||
121 _LINUX_CAPABILITY_VERSION_3 == h->version)
122 len = 2;
123 else
124 len = 1;
125
126 if (umoven_or_printaddr(tcp, addr, len * sizeof(data[0]), data))
127 return;
128
129 tprints("{effective=");
130 print_cap_bits(data[0].effective, len > 1 ? data[1].effective : 0);
131 tprints(", permitted=");
132 print_cap_bits(data[0].permitted, len > 1 ? data[1].permitted : 0);
133 tprints(", inheritable=");
134 print_cap_bits(data[0].inheritable, len > 1 ? data[1].inheritable : 0);
135 tprints("}");
136 }
137
SYS_FUNC(capget)138 SYS_FUNC(capget)
139 {
140 const struct user_cap_header_struct *h;
141
142 if (entering(tcp)) {
143 h = get_cap_header(tcp, tcp->u_arg[0]);
144 print_cap_header(tcp, tcp->u_arg[0], h);
145 tprints(", ");
146 } else {
147 h = syserror(tcp) ? NULL : get_cap_header(tcp, tcp->u_arg[0]);
148 print_cap_data(tcp, tcp->u_arg[1], h);
149 }
150 return 0;
151 }
152
SYS_FUNC(capset)153 SYS_FUNC(capset)
154 {
155 const struct user_cap_header_struct *const h =
156 get_cap_header(tcp, tcp->u_arg[0]);
157 print_cap_header(tcp, tcp->u_arg[0], h);
158 tprints(", ");
159 print_cap_data(tcp, tcp->u_arg[1], h);
160
161 return RVAL_DECODED;
162 }
163