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 if (code)
130 tprints(code);
131 else
132 tprintf("%#x", si_code);
133 }
134
135 static void
print_si_info(const siginfo_t * sip)136 print_si_info(const siginfo_t *sip)
137 {
138 if (sip->si_errno) {
139 tprints(", si_errno=");
140 if ((unsigned) sip->si_errno < nerrnos
141 && errnoent[sip->si_errno])
142 tprints(errnoent[sip->si_errno]);
143 else
144 tprintf("%d", sip->si_errno);
145 }
146
147 if (SI_FROMUSER(sip)) {
148 switch (sip->si_code) {
149 case SI_USER:
150 printsigsource(sip);
151 break;
152 case SI_TKILL:
153 printsigsource(sip);
154 break;
155 #if defined HAVE_SIGINFO_T_SI_TIMERID && defined HAVE_SIGINFO_T_SI_OVERRUN
156 case SI_TIMER:
157 tprintf(", si_timerid=%#x, si_overrun=%d",
158 sip->si_timerid, sip->si_overrun);
159 printsigval(sip);
160 break;
161 #endif
162 default:
163 printsigsource(sip);
164 if (sip->si_ptr)
165 printsigval(sip);
166 break;
167 }
168 } else {
169 switch (sip->si_signo) {
170 case SIGCHLD:
171 printsigsource(sip);
172 tprints(", si_status=");
173 if (sip->si_code == CLD_EXITED)
174 tprintf("%d", sip->si_status);
175 else
176 printsignal(sip->si_status);
177 tprintf(", si_utime=%llu, si_stime=%llu",
178 zero_extend_signed_to_ull(sip->si_utime),
179 zero_extend_signed_to_ull(sip->si_stime));
180 break;
181 case SIGILL: case SIGFPE:
182 case SIGSEGV: case SIGBUS:
183 tprints(", si_addr=");
184 printaddr(ptr_to_kulong(sip->si_addr));
185 break;
186 case SIGPOLL:
187 switch (sip->si_code) {
188 case POLL_IN: case POLL_OUT: case POLL_MSG:
189 tprintf(", si_band=%ld",
190 (long) sip->si_band);
191 break;
192 }
193 break;
194 #ifdef HAVE_SIGINFO_T_SI_SYSCALL
195 case SIGSYS: {
196 /*
197 * Note that we can safely use the personlity set in
198 * current_personality here (and don't have to guess it
199 * based on X32_SYSCALL_BIT and si_arch, for example):
200 * - The signal is delivered as a result of seccomp
201 * filtering to the process executing forbidden
202 * syscall.
203 * - We have set the personality for the tracee during
204 * the syscall entering.
205 * - The current_personality is reliably switched in
206 * the next_event routine, it is set to the
207 * personality of the last call made (the one that
208 * triggered the signal delivery).
209 * - Looks like there are no other cases where SIGSYS
210 * is delivered from the kernel so far.
211 */
212 const char *scname = syscall_name(shuffle_scno(
213 (unsigned) sip->si_syscall));
214
215 tprints(", si_call_addr=");
216 printaddr(ptr_to_kulong(sip->si_call_addr));
217 tprints(", si_syscall=");
218 if (scname)
219 tprintf("%s%s",
220 nr_prefix(sip->si_syscall), scname);
221 else
222 tprintf("%u", (unsigned) sip->si_syscall);
223 tprints(", si_arch=");
224 printxval(audit_arch, sip->si_arch, "AUDIT_ARCH_???");
225 break;
226 }
227 #endif
228 default:
229 if (sip->si_pid || sip->si_uid)
230 printsigsource(sip);
231 if (sip->si_ptr)
232 printsigval(sip);
233 }
234 }
235 }
236
237 #ifdef IN_MPERS
238 static
239 #endif
240 void
printsiginfo(const siginfo_t * sip)241 printsiginfo(const siginfo_t *sip)
242 {
243 if (sip->si_signo == 0) {
244 tprints("{}");
245 return;
246 }
247 tprints("{si_signo=");
248 printsignal(sip->si_signo);
249
250 tprints(", si_code=");
251 print_si_code(sip->si_signo, sip->si_code);
252
253 #ifdef SI_NOINFO
254 if (sip->si_code != SI_NOINFO)
255 #endif
256 print_si_info(sip);
257
258 tprints("}");
259 }
260
MPERS_PRINTER_DECL(void,printsiginfo_at,struct tcb * const tcp,const kernel_ulong_t addr)261 MPERS_PRINTER_DECL(void, printsiginfo_at,
262 struct tcb *const tcp, const kernel_ulong_t addr)
263 {
264 siginfo_t si;
265
266 if (!umove_or_printaddr(tcp, addr, &si))
267 printsiginfo(&si);
268 }
269
270 static bool
print_siginfo_t(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)271 print_siginfo_t(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
272 {
273 printsiginfo((const siginfo_t *) elem_buf);
274 return true;
275 }
276
MPERS_PRINTER_DECL(void,print_siginfo_array,struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len)277 MPERS_PRINTER_DECL(void, print_siginfo_array, struct tcb *const tcp,
278 const kernel_ulong_t addr, const kernel_ulong_t len)
279 {
280 siginfo_t si;
281
282 print_array(tcp, addr, len, &si, sizeof(si),
283 umoven_or_printaddr, print_siginfo_t, 0);
284 }
285