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) 2001 John Hughes <john@Calva.COM>
7 * Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
8 * Copyright (c) 2011-2015 Dmitry V. Levin <ldv@altlinux.org>
9 * Copyright (c) 2015 Elvira Khabirova <lineprinter0@gmail.com>
10 * Copyright (c) 2015-2018 The strace developers.
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "defs.h"
37
38 #include DEF_MPERS_TYPE(siginfo_t)
39
40 #include <signal.h>
41 #include <linux/audit.h>
42
43 #include MPERS_DEFS
44
45 #include "nr_prefix.c"
46
47 #ifndef IN_MPERS
48 #include "printsiginfo.h"
49 #endif
50
51 #include "xlat/audit_arch.h"
52 #include "xlat/sigbus_codes.h"
53 #include "xlat/sigchld_codes.h"
54 #include "xlat/sigfpe_codes.h"
55 #include "xlat/sigill_codes.h"
56 #include "xlat/siginfo_codes.h"
57 #include "xlat/sigpoll_codes.h"
58 #include "xlat/sigprof_codes.h"
59 #include "xlat/sigsegv_codes.h"
60 #include "xlat/sigsys_codes.h"
61 #include "xlat/sigtrap_codes.h"
62
63 #ifdef SIGEMT
64 # include "xlat/sigemt_codes.h"
65 #endif
66
67 #ifndef SI_FROMUSER
68 # define SI_FROMUSER(sip) ((sip)->si_code <= 0)
69 #endif
70
71 static void
printsigsource(const siginfo_t * sip)72 printsigsource(const siginfo_t *sip)
73 {
74 tprintf(", si_pid=%u, si_uid=%u",
75 (unsigned int) sip->si_pid,
76 (unsigned int) sip->si_uid);
77 }
78
79 static void
printsigval(const siginfo_t * sip)80 printsigval(const siginfo_t *sip)
81 {
82 tprintf(", si_value={int=%d, ptr=", sip->si_int);
83 printaddr(ptr_to_kulong(sip->si_ptr));
84 tprints("}");
85 }
86
87 static void
print_si_code(int si_signo,unsigned int si_code)88 print_si_code(int si_signo, unsigned int si_code)
89 {
90 const char *code = xlookup(siginfo_codes, si_code);
91
92 if (!code) {
93 switch (si_signo) {
94 case SIGTRAP:
95 code = xlookup(sigtrap_codes, si_code);
96 break;
97 case SIGCHLD:
98 code = xlookup(sigchld_codes, si_code);
99 break;
100 case SIGPOLL:
101 code = xlookup(sigpoll_codes, si_code);
102 break;
103 case SIGPROF:
104 code = xlookup(sigprof_codes, si_code);
105 break;
106 case SIGILL:
107 code = xlookup(sigill_codes, si_code);
108 break;
109 #ifdef SIGEMT
110 case SIGEMT:
111 code = xlookup(sigemt_codes, si_code);
112 break;
113 #endif
114 case SIGFPE:
115 code = xlookup(sigfpe_codes, si_code);
116 break;
117 case SIGSEGV:
118 code = xlookup(sigsegv_codes, si_code);
119 break;
120 case SIGBUS:
121 code = xlookup(sigbus_codes, si_code);
122 break;
123 case SIGSYS:
124 code = xlookup(sigsys_codes, si_code);
125 break;
126 }
127 }
128
129 print_xlat_ex(si_code, code, XLAT_STYLE_DEFAULT);
130 }
131
132 static void
print_si_info(const siginfo_t * sip)133 print_si_info(const siginfo_t *sip)
134 {
135 if (sip->si_errno) {
136 tprints(", si_errno=");
137 if ((unsigned) sip->si_errno < nerrnos
138 && errnoent[sip->si_errno])
139 tprints(errnoent[sip->si_errno]);
140 else
141 tprintf("%d", sip->si_errno);
142 }
143
144 if (SI_FROMUSER(sip)) {
145 switch (sip->si_code) {
146 case SI_USER:
147 printsigsource(sip);
148 break;
149 case SI_TKILL:
150 printsigsource(sip);
151 break;
152 #if defined HAVE_SIGINFO_T_SI_TIMERID && defined HAVE_SIGINFO_T_SI_OVERRUN
153 case SI_TIMER:
154 tprintf(", si_timerid=%#x, si_overrun=%d",
155 sip->si_timerid, sip->si_overrun);
156 printsigval(sip);
157 break;
158 #endif
159 default:
160 printsigsource(sip);
161 if (sip->si_ptr)
162 printsigval(sip);
163 break;
164 }
165 } else {
166 switch (sip->si_signo) {
167 case SIGCHLD:
168 printsigsource(sip);
169 tprints(", si_status=");
170 if (sip->si_code == CLD_EXITED)
171 tprintf("%d", sip->si_status);
172 else
173 printsignal(sip->si_status);
174 tprintf(", si_utime=%llu, si_stime=%llu",
175 zero_extend_signed_to_ull(sip->si_utime),
176 zero_extend_signed_to_ull(sip->si_stime));
177 break;
178 case SIGILL: case SIGFPE:
179 case SIGSEGV: case SIGBUS:
180 tprints(", si_addr=");
181 printaddr(ptr_to_kulong(sip->si_addr));
182 break;
183 case SIGPOLL:
184 switch (sip->si_code) {
185 case POLL_IN: case POLL_OUT: case POLL_MSG:
186 tprintf(", si_band=%ld",
187 (long) sip->si_band);
188 break;
189 }
190 break;
191 #ifdef HAVE_SIGINFO_T_SI_SYSCALL
192 case SIGSYS: {
193 /*
194 * Note that we can safely use the personlity set in
195 * current_personality here (and don't have to guess it
196 * based on X32_SYSCALL_BIT and si_arch, for example):
197 * - The signal is delivered as a result of seccomp
198 * filtering to the process executing forbidden
199 * syscall.
200 * - We have set the personality for the tracee during
201 * the syscall entering.
202 * - The current_personality is reliably switched in
203 * the next_event routine, it is set to the
204 * personality of the last call made (the one that
205 * triggered the signal delivery).
206 * - Looks like there are no other cases where SIGSYS
207 * is delivered from the kernel so far.
208 */
209 const char *scname = syscall_name(shuffle_scno(
210 (unsigned) sip->si_syscall));
211
212 tprints(", si_call_addr=");
213 printaddr(ptr_to_kulong(sip->si_call_addr));
214 tprints(", si_syscall=");
215 if (scname)
216 tprintf("%s%s",
217 nr_prefix(sip->si_syscall), scname);
218 else
219 tprintf("%u", (unsigned) sip->si_syscall);
220 tprints(", si_arch=");
221 printxval(audit_arch, sip->si_arch, "AUDIT_ARCH_???");
222 break;
223 }
224 #endif
225 default:
226 if (sip->si_pid || sip->si_uid)
227 printsigsource(sip);
228 if (sip->si_ptr)
229 printsigval(sip);
230 }
231 }
232 }
233
234 #ifdef IN_MPERS
235 static
236 #endif
237 void
printsiginfo(const siginfo_t * sip)238 printsiginfo(const siginfo_t *sip)
239 {
240 if (sip->si_signo == 0) {
241 tprints("{}");
242 return;
243 }
244 tprints("{si_signo=");
245 printsignal(sip->si_signo);
246
247 tprints(", si_code=");
248 print_si_code(sip->si_signo, sip->si_code);
249
250 #ifdef SI_NOINFO
251 if (sip->si_code != SI_NOINFO)
252 #endif
253 print_si_info(sip);
254
255 tprints("}");
256 }
257
MPERS_PRINTER_DECL(void,printsiginfo_at,struct tcb * const tcp,const kernel_ulong_t addr)258 MPERS_PRINTER_DECL(void, printsiginfo_at,
259 struct tcb *const tcp, const kernel_ulong_t addr)
260 {
261 siginfo_t si;
262
263 if (!umove_or_printaddr(tcp, addr, &si))
264 printsiginfo(&si);
265 }
266
267 static bool
print_siginfo_t(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)268 print_siginfo_t(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
269 {
270 printsiginfo((const siginfo_t *) elem_buf);
271 return true;
272 }
273
MPERS_PRINTER_DECL(void,print_siginfo_array,struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len)274 MPERS_PRINTER_DECL(void, print_siginfo_array, struct tcb *const tcp,
275 const kernel_ulong_t addr, const kernel_ulong_t len)
276 {
277 siginfo_t si;
278
279 print_array(tcp, addr, len, &si, sizeof(si),
280 tfetch_mem, print_siginfo_t, 0);
281 }
282