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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