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 typedef struct user_cap_header_struct {
56 uint32_t version;
57 int pid;
58 } *cap_user_header_t;
59
60 typedef struct user_cap_data_struct {
61 uint32_t effective;
62 uint32_t permitted;
63 uint32_t inheritable;
64 } *cap_user_data_t;
65
66 static cap_user_header_t
get_cap_header(struct tcb * tcp,unsigned long addr)67 get_cap_header(struct tcb *tcp, unsigned long 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 * tcp,unsigned long addr,cap_user_header_t h)81 print_cap_header(struct tcb *tcp, unsigned long addr, cap_user_header_t h)
82 {
83 if (!addr || !h) {
84 printaddr(addr);
85 return;
86 }
87
88 tprints("{");
89 printxval(cap_version, h->version,
90 "_LINUX_CAPABILITY_VERSION_???");
91 tprintf(", %d}", h->pid);
92 }
93
94 static void
print_cap_bits(const uint32_t lo,const uint32_t hi)95 print_cap_bits(const uint32_t lo, const uint32_t hi)
96 {
97 if (lo || !hi)
98 printflags(cap_mask0, lo, "CAP_???");
99
100 if (hi) {
101 if (lo)
102 tprints("|");
103 printflags(cap_mask1, hi, "CAP_???");
104 }
105 }
106
107 static void
print_cap_data(struct tcb * tcp,unsigned long addr,const cap_user_header_t h)108 print_cap_data(struct tcb *tcp, unsigned long addr, const cap_user_header_t h)
109 {
110 struct user_cap_data_struct data[2];
111 unsigned int len;
112
113 if (!addr || !h) {
114 printaddr(addr);
115 return;
116 }
117
118 if (_LINUX_CAPABILITY_VERSION_2 == h->version ||
119 _LINUX_CAPABILITY_VERSION_3 == h->version)
120 len = 2;
121 else
122 len = 1;
123
124 if (umoven_or_printaddr(tcp, addr, len * sizeof(data[0]), data))
125 return;
126
127 tprints("{");
128 print_cap_bits(data[0].effective, len > 1 ? data[1].effective : 0);
129 tprints(", ");
130 print_cap_bits(data[0].permitted, len > 1 ? data[1].permitted : 0);
131 tprints(", ");
132 print_cap_bits(data[0].inheritable, len > 1 ? data[1].inheritable : 0);
133 tprints("}");
134 }
135
SYS_FUNC(capget)136 SYS_FUNC(capget)
137 {
138 cap_user_header_t h;
139
140 if (entering(tcp)) {
141 h = get_cap_header(tcp, tcp->u_arg[0]);
142 print_cap_header(tcp, tcp->u_arg[0], h);
143 tprints(", ");
144 } else {
145 h = syserror(tcp) ? NULL : get_cap_header(tcp, tcp->u_arg[0]);
146 print_cap_data(tcp, tcp->u_arg[1], h);
147 }
148 return 0;
149 }
150
SYS_FUNC(capset)151 SYS_FUNC(capset)
152 {
153 cap_user_header_t h = get_cap_header(tcp, tcp->u_arg[0]);
154 print_cap_header(tcp, tcp->u_arg[0], h);
155 tprints(", ");
156 print_cap_data(tcp, tcp->u_arg[1], h);
157
158 return RVAL_DECODED;
159 }
160