1 /* $NetBSD: t_siginfo.c,v 1.29 2015/02/17 09:47:08 isaki Exp $ */
2
3 /*-
4 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <atf-c.h>
30
31 #include <sys/inttypes.h>
32 #include <sys/resource.h>
33 #include <sys/sysctl.h>
34 #include <sys/time.h>
35 #include <sys/ucontext.h>
36 #include <sys/wait.h>
37
38 #include <assert.h>
39 #include <signal.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44 #include <setjmp.h>
45 #include <float.h>
46
47 #ifdef HAVE_FENV
48 #include <fenv.h>
49 #include <ieeefp.h> /* only need for ARM Cortex/Neon hack */
50 #elif defined(_FLOAT_IEEE754)
51 #include <ieeefp.h>
52 #endif
53
54 #include "isqemu.h"
55
56 /* for sigbus */
57 volatile char *addr;
58
59 /* for sigchild */
60 pid_t child;
61 int code;
62 int status;
63
64 /* for sigfpe */
65 sig_atomic_t fltdiv_signalled = 0;
66 sig_atomic_t intdiv_signalled = 0;
67
68 static void
sig_debug(int signo,siginfo_t * info,ucontext_t * ctx)69 sig_debug(int signo, siginfo_t *info, ucontext_t *ctx)
70 {
71 unsigned int i;
72
73 printf("%d %p %p\n", signo, info, ctx);
74 if (info != NULL) {
75 printf("si_signo=%d\n", info->si_signo);
76 printf("si_errno=%d\n", info->si_errno);
77 printf("si_code=%d\n", info->si_code);
78 printf("si_value.sival_int=%d\n", info->si_value.sival_int);
79 }
80 if (ctx != NULL) {
81 printf("uc_flags 0x%x\n", ctx->uc_flags);
82 printf("uc_link %p\n", ctx->uc_link);
83 for (i = 0; i < __arraycount(ctx->uc_sigmask.__bits); i++)
84 printf("uc_sigmask[%d] 0x%x\n", i,
85 ctx->uc_sigmask.__bits[i]);
86 printf("uc_stack %p %lu 0x%x\n", ctx->uc_stack.ss_sp,
87 (unsigned long)ctx->uc_stack.ss_size,
88 ctx->uc_stack.ss_flags);
89 for (i = 0; i < __arraycount(ctx->uc_mcontext.__gregs); i++)
90 printf("uc_mcontext.greg[%d] 0x%lx\n", i,
91 (long)ctx->uc_mcontext.__gregs[i]);
92 }
93 }
94
95 static void
sigalrm_action(int signo,siginfo_t * info,void * ptr)96 sigalrm_action(int signo, siginfo_t *info, void *ptr)
97 {
98
99 sig_debug(signo, info, (ucontext_t *)ptr);
100
101 ATF_REQUIRE_EQ(info->si_signo, SIGALRM);
102 ATF_REQUIRE_EQ(info->si_code, SI_TIMER);
103 ATF_REQUIRE_EQ(info->si_value.sival_int, ITIMER_REAL);
104
105 atf_tc_pass();
106 /* NOTREACHED */
107 }
108
109 ATF_TC(sigalarm);
110
ATF_TC_HEAD(sigalarm,tc)111 ATF_TC_HEAD(sigalarm, tc)
112 {
113
114 atf_tc_set_md_var(tc, "descr",
115 "Checks that signal trampoline correctly calls SIGALRM handler");
116 }
117
ATF_TC_BODY(sigalarm,tc)118 ATF_TC_BODY(sigalarm, tc)
119 {
120 struct sigaction sa;
121 sa.sa_flags = SA_SIGINFO;
122 sa.sa_sigaction = sigalrm_action;
123 sigemptyset(&sa.sa_mask);
124 sigaction(SIGALRM, &sa, NULL);
125 for (;;) {
126 alarm(1);
127 sleep(1);
128 }
129 atf_tc_fail("SIGALRM handler wasn't called");
130 }
131
132 static void
sigchild_action(int signo,siginfo_t * info,void * ptr)133 sigchild_action(int signo, siginfo_t *info, void *ptr)
134 {
135 if (info != NULL) {
136 printf("info=%p\n", info);
137 printf("ptr=%p\n", ptr);
138 printf("si_signo=%d\n", info->si_signo);
139 printf("si_errno=%d\n", info->si_errno);
140 printf("si_code=%d\n", info->si_code);
141 printf("si_uid=%d\n", info->si_uid);
142 printf("si_pid=%d\n", info->si_pid);
143 printf("si_status=%d\n", info->si_status);
144 printf("si_utime=%lu\n", (unsigned long int)info->si_utime);
145 printf("si_stime=%lu\n", (unsigned long int)info->si_stime);
146 }
147 ATF_REQUIRE_EQ(info->si_code, code);
148 ATF_REQUIRE_EQ(info->si_signo, SIGCHLD);
149 ATF_REQUIRE_EQ(info->si_uid, getuid());
150 ATF_REQUIRE_EQ(info->si_pid, child);
151 if (WIFEXITED(info->si_status))
152 ATF_REQUIRE_EQ(WEXITSTATUS(info->si_status), status);
153 else if (WIFSTOPPED(info->si_status))
154 ATF_REQUIRE_EQ(WSTOPSIG(info->si_status), status);
155 else if (WIFSIGNALED(info->si_status))
156 ATF_REQUIRE_EQ(WTERMSIG(info->si_status), status);
157 }
158
159 static void
setchildhandler(void (* action)(int,siginfo_t *,void *))160 setchildhandler(void (*action)(int, siginfo_t *, void *))
161 {
162 struct sigaction sa;
163 sa.sa_flags = SA_SIGINFO;
164 sa.sa_sigaction = action;
165 sigemptyset(&sa.sa_mask);
166 sigaction(SIGCHLD, &sa, NULL);
167 }
168
169 static void
sigchild_setup(void)170 sigchild_setup(void)
171 {
172 sigset_t set;
173 struct rlimit rlim;
174
175 (void)getrlimit(RLIMIT_CORE, &rlim);
176 rlim.rlim_cur = rlim.rlim_max;
177 (void)setrlimit(RLIMIT_CORE, &rlim);
178
179 setchildhandler(sigchild_action);
180 sigemptyset(&set);
181 sigaddset(&set, SIGCHLD);
182 sigprocmask(SIG_BLOCK, &set, NULL);
183 }
184
185 ATF_TC(sigchild_normal);
ATF_TC_HEAD(sigchild_normal,tc)186 ATF_TC_HEAD(sigchild_normal, tc)
187 {
188
189 atf_tc_set_md_var(tc, "descr",
190 "Checks that signal trampoline correctly calls SIGCHLD handler "
191 "when child exits normally");
192 }
193
ATF_TC_BODY(sigchild_normal,tc)194 ATF_TC_BODY(sigchild_normal, tc)
195 {
196 sigset_t set;
197
198 sigchild_setup();
199
200 status = 25;
201 code = CLD_EXITED;
202
203 switch ((child = fork())) {
204 case 0:
205 sleep(1);
206 exit(status);
207 case -1:
208 atf_tc_fail("fork failed");
209 default:
210 sigemptyset(&set);
211 sigsuspend(&set);
212 }
213 }
214
215 ATF_TC(sigchild_dump);
ATF_TC_HEAD(sigchild_dump,tc)216 ATF_TC_HEAD(sigchild_dump, tc)
217 {
218
219 atf_tc_set_md_var(tc, "descr",
220 "Checks that signal trampoline correctly calls SIGCHLD handler "
221 "when child segfaults");
222 }
223
ATF_TC_BODY(sigchild_dump,tc)224 ATF_TC_BODY(sigchild_dump, tc)
225 {
226 sigset_t set;
227
228 sigchild_setup();
229
230 status = SIGSEGV;
231 code = CLD_DUMPED;
232
233 switch ((child = fork())) {
234 case 0:
235 sleep(1);
236 *(volatile long *)0 = 0;
237 atf_tc_fail("Child did not segfault");
238 /* NOTREACHED */
239 case -1:
240 atf_tc_fail("fork failed");
241 default:
242 sigemptyset(&set);
243 sigsuspend(&set);
244 }
245 }
246
247 ATF_TC(sigchild_kill);
ATF_TC_HEAD(sigchild_kill,tc)248 ATF_TC_HEAD(sigchild_kill, tc)
249 {
250
251 atf_tc_set_md_var(tc, "descr",
252 "Checks that signal trampoline correctly calls SIGCHLD handler "
253 "when child is killed");
254 }
255
ATF_TC_BODY(sigchild_kill,tc)256 ATF_TC_BODY(sigchild_kill, tc)
257 {
258 sigset_t set;
259
260 sigchild_setup();
261
262 status = SIGPIPE;
263 code = CLD_KILLED;
264
265 switch ((child = fork())) {
266 case 0:
267 sigemptyset(&set);
268 sigsuspend(&set);
269 break;
270 case -1:
271 atf_tc_fail("fork failed");
272 default:
273 kill(child, SIGPIPE);
274 sigemptyset(&set);
275 sigsuspend(&set);
276 }
277 }
278
279 static sigjmp_buf sigfpe_flt_env;
280 static void
sigfpe_flt_action(int signo,siginfo_t * info,void * ptr)281 sigfpe_flt_action(int signo, siginfo_t *info, void *ptr)
282 {
283
284 sig_debug(signo, info, (ucontext_t *)ptr);
285
286 if (fltdiv_signalled++ != 0)
287 atf_tc_fail("FPE handler called more than once");
288
289 ATF_REQUIRE_EQ(info->si_signo, SIGFPE);
290 ATF_REQUIRE_EQ(info->si_code, FPE_FLTDIV);
291 ATF_REQUIRE_EQ(info->si_errno, 0);
292
293 siglongjmp(sigfpe_flt_env, 1);
294 }
295
296 ATF_TC(sigfpe_flt);
ATF_TC_HEAD(sigfpe_flt,tc)297 ATF_TC_HEAD(sigfpe_flt, tc)
298 {
299
300 atf_tc_set_md_var(tc, "descr",
301 "Checks that signal trampoline correctly calls SIGFPE handler "
302 "for floating div-by-zero");
303 }
304
ATF_TC_BODY(sigfpe_flt,tc)305 ATF_TC_BODY(sigfpe_flt, tc)
306 {
307 struct sigaction sa;
308 double d = strtod("0", NULL);
309
310 if (isQEMU())
311 atf_tc_skip("Test does not run correctly under QEMU");
312 #if defined(__powerpc__)
313 atf_tc_skip("Test not valid on powerpc");
314 #elif defined(__arm__) && !__SOFTFP__
315 /*
316 * Some NEON fpus do not implement IEEE exception handling,
317 * skip these tests if running on them and compiled for
318 * hard float.
319 */
320 if (0 == fpsetmask(fpsetmask(FP_X_INV)))
321 atf_tc_skip("FPU does not implement exception handling");
322 #endif
323 if (sigsetjmp(sigfpe_flt_env, 0) == 0) {
324 sa.sa_flags = SA_SIGINFO;
325 sa.sa_sigaction = sigfpe_flt_action;
326 sigemptyset(&sa.sa_mask);
327 sigaction(SIGFPE, &sa, NULL);
328 #ifdef HAVE_FENV
329 feenableexcept(FE_ALL_EXCEPT);
330 #elif defined(_FLOAT_IEEE754)
331 fpsetmask(FP_X_INV|FP_X_DZ|FP_X_OFL|FP_X_UFL|FP_X_IMP);
332 #endif
333 printf("%g\n", 1 / d);
334 }
335 if (fltdiv_signalled == 0)
336 atf_tc_fail("FPE signal handler was not invoked");
337 }
338
339 static sigjmp_buf sigfpe_int_env;
340 static void
sigfpe_int_action(int signo,siginfo_t * info,void * ptr)341 sigfpe_int_action(int signo, siginfo_t *info, void *ptr)
342 {
343
344 sig_debug(signo, info, (ucontext_t *)ptr);
345
346 if (intdiv_signalled++ != 0)
347 atf_tc_fail("INTDIV handler called more than once");
348
349 ATF_REQUIRE_EQ(info->si_signo, SIGFPE);
350 ATF_REQUIRE_EQ(info->si_code, FPE_INTDIV);
351 atf_tc_expect_pass();
352 ATF_REQUIRE_EQ(info->si_errno, 0);
353
354 siglongjmp(sigfpe_int_env, 1);
355 }
356
357 ATF_TC(sigfpe_int);
ATF_TC_HEAD(sigfpe_int,tc)358 ATF_TC_HEAD(sigfpe_int, tc)
359 {
360
361 atf_tc_set_md_var(tc, "descr",
362 "Checks that signal trampoline correctly calls SIGFPE handler "
363 "for integer div-by-zero (PR port-i386/43655)");
364 }
365
ATF_TC_BODY(sigfpe_int,tc)366 ATF_TC_BODY(sigfpe_int, tc)
367 {
368 struct sigaction sa;
369 long l = strtol("0", NULL, 10);
370
371 #if defined(__powerpc__)
372 atf_tc_skip("Test not valid on powerpc");
373 #endif
374 if (sigsetjmp(sigfpe_int_env, 0) == 0) {
375 sa.sa_flags = SA_SIGINFO;
376 sa.sa_sigaction = sigfpe_int_action;
377 sigemptyset(&sa.sa_mask);
378 sigaction(SIGFPE, &sa, NULL);
379 #ifdef HAVE_FENV
380 feenableexcept(FE_ALL_EXCEPT);
381 #elif defined(_FLOAT_IEEE754)
382 fpsetmask(FP_X_INV|FP_X_DZ|FP_X_OFL|FP_X_UFL|FP_X_IMP);
383 #endif
384 printf("%ld\n", 1 / l);
385 }
386 if (intdiv_signalled == 0)
387 atf_tc_fail("FPE signal handler was not invoked");
388 }
389
390 static void
sigsegv_action(int signo,siginfo_t * info,void * ptr)391 sigsegv_action(int signo, siginfo_t *info, void *ptr)
392 {
393
394 sig_debug(signo, info, (ucontext_t *)ptr);
395
396 ATF_REQUIRE_EQ(info->si_signo, SIGSEGV);
397 ATF_REQUIRE_EQ(info->si_errno, 0);
398 ATF_REQUIRE_EQ(info->si_code, SEGV_MAPERR);
399 ATF_REQUIRE_EQ(info->si_addr, (void *)0);
400
401 atf_tc_pass();
402 /* NOTREACHED */
403 }
404
405 ATF_TC(sigsegv);
ATF_TC_HEAD(sigsegv,tc)406 ATF_TC_HEAD(sigsegv, tc)
407 {
408
409 atf_tc_set_md_var(tc, "descr",
410 "Checks that signal trampoline correctly calls SIGSEGV handler");
411 }
412
ATF_TC_BODY(sigsegv,tc)413 ATF_TC_BODY(sigsegv, tc)
414 {
415 struct sigaction sa;
416
417 sa.sa_flags = SA_SIGINFO;
418 sa.sa_sigaction = sigsegv_action;
419 sigemptyset(&sa.sa_mask);
420 sigaction(SIGSEGV, &sa, NULL);
421
422 *(volatile long *)0 = 0;
423 atf_tc_fail("Test did not fault as expected");
424 }
425
426 static void
sigbus_action(int signo,siginfo_t * info,void * ptr)427 sigbus_action(int signo, siginfo_t *info, void *ptr)
428 {
429
430 printf("si_addr = %p\n", info->si_addr);
431 sig_debug(signo, info, (ucontext_t *)ptr);
432
433 ATF_REQUIRE_EQ(info->si_signo, SIGBUS);
434 ATF_REQUIRE_EQ(info->si_errno, 0);
435 ATF_REQUIRE_EQ(info->si_code, BUS_ADRALN);
436
437 #if defined(__i386__) || defined(__x86_64__)
438 atf_tc_expect_fail("x86 architecture does not correctly "
439 "report the address where the unaligned access occured");
440 #endif
441 ATF_REQUIRE_EQ(info->si_addr, (volatile void *)addr);
442
443 atf_tc_pass();
444 /* NOTREACHED */
445 }
446
447 ATF_TC(sigbus_adraln);
ATF_TC_HEAD(sigbus_adraln,tc)448 ATF_TC_HEAD(sigbus_adraln, tc)
449 {
450
451 atf_tc_set_md_var(tc, "descr",
452 "Checks that signal trampoline correctly calls SIGBUS handler "
453 "for invalid address alignment");
454 }
455
ATF_TC_BODY(sigbus_adraln,tc)456 ATF_TC_BODY(sigbus_adraln, tc)
457 {
458 struct sigaction sa;
459
460 #if defined(__alpha__) || defined(__arm__)
461 int rv, val;
462 size_t len = sizeof(val);
463 rv = sysctlbyname("machdep.unaligned_sigbus", &val, &len, NULL, 0);
464 ATF_REQUIRE(rv == 0);
465 if (val == 0)
466 atf_tc_skip("No SIGBUS signal for unaligned accesses");
467 #endif
468
469 /* m68k (except sun2) never issue SIGBUS (PR lib/49653) */
470 if (strcmp(MACHINE_ARCH, "m68k") == 0)
471 atf_tc_skip("No SIGBUS signal for unaligned accesses");
472
473 sa.sa_flags = SA_SIGINFO;
474 sa.sa_sigaction = sigbus_action;
475 sigemptyset(&sa.sa_mask);
476 sigaction(SIGBUS, &sa, NULL);
477
478 /* Enable alignment checks for x86. 0x40000 is PSL_AC. */
479 #if defined(__i386__)
480 __asm__("pushf; orl $0x40000, (%esp); popf");
481 #elif defined(__amd64__)
482 __asm__("pushf; orl $0x40000, (%rsp); popf");
483 #endif
484
485 addr = calloc(2, sizeof(int));
486 ATF_REQUIRE(addr != NULL);
487
488 if (isQEMU())
489 atf_tc_expect_fail("QEMU fails to trap unaligned accesses");
490
491 /* Force an unaligned access */
492 addr++;
493 printf("now trying to access unaligned address %p\n", addr);
494 ATF_REQUIRE_EQ(*(volatile int *)addr, 0);
495
496 atf_tc_fail("Test did not fault as expected");
497 }
498
ATF_TP_ADD_TCS(tp)499 ATF_TP_ADD_TCS(tp)
500 {
501
502 ATF_TP_ADD_TC(tp, sigalarm);
503 ATF_TP_ADD_TC(tp, sigchild_normal);
504 ATF_TP_ADD_TC(tp, sigchild_dump);
505 ATF_TP_ADD_TC(tp, sigchild_kill);
506 ATF_TP_ADD_TC(tp, sigfpe_flt);
507 ATF_TP_ADD_TC(tp, sigfpe_int);
508 ATF_TP_ADD_TC(tp, sigsegv);
509 ATF_TP_ADD_TC(tp, sigbus_adraln);
510
511 return atf_no_error();
512 }
513