File: | src/lib/libkvm/kvm.c |
Warning: | line 629, column 14 Access to field 'program' results in a dereference of a null pointer (loaded from variable 'kd') |
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1 | /* $OpenBSD: kvm.c,v 1.70 2021/12/01 16:51:57 deraadt Exp $ */ | |||
2 | /* $NetBSD: kvm.c,v 1.43 1996/05/05 04:31:59 gwr Exp $ */ | |||
3 | ||||
4 | /*- | |||
5 | * Copyright (c) 1989, 1992, 1993 | |||
6 | * The Regents of the University of California. All rights reserved. | |||
7 | * | |||
8 | * This code is derived from software developed by the Computer Systems | |||
9 | * Engineering group at Lawrence Berkeley Laboratory under DARPA contract | |||
10 | * BG 91-66 and contributed to Berkeley. | |||
11 | * | |||
12 | * Redistribution and use in source and binary forms, with or without | |||
13 | * modification, are permitted provided that the following conditions | |||
14 | * are met: | |||
15 | * 1. Redistributions of source code must retain the above copyright | |||
16 | * notice, this list of conditions and the following disclaimer. | |||
17 | * 2. Redistributions in binary form must reproduce the above copyright | |||
18 | * notice, this list of conditions and the following disclaimer in the | |||
19 | * documentation and/or other materials provided with the distribution. | |||
20 | * 3. Neither the name of the University nor the names of its contributors | |||
21 | * may be used to endorse or promote products derived from this software | |||
22 | * without specific prior written permission. | |||
23 | * | |||
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |||
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |||
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||
34 | * SUCH DAMAGE. | |||
35 | */ | |||
36 | ||||
37 | #include <sys/param.h> /* MAXCOMLEN MID_MACHINE */ | |||
38 | #include <sys/proc.h> | |||
39 | #include <sys/ioctl.h> | |||
40 | #include <sys/stat.h> | |||
41 | #include <sys/sysctl.h> | |||
42 | ||||
43 | #include <sys/core.h> | |||
44 | #include <sys/exec.h> | |||
45 | #include <sys/kcore.h> | |||
46 | ||||
47 | #include <stddef.h> | |||
48 | #include <errno(*__errno()).h> | |||
49 | #include <ctype.h> | |||
50 | #include <db.h> | |||
51 | #include <fcntl.h> | |||
52 | #include <libgen.h> | |||
53 | #include <limits.h> | |||
54 | #include <nlist.h> | |||
55 | #include <paths.h> | |||
56 | #include <stdio.h> | |||
57 | #include <stdlib.h> | |||
58 | #include <string.h> | |||
59 | #include <unistd.h> | |||
60 | #include <kvm.h> | |||
61 | #include <stdarg.h> | |||
62 | ||||
63 | #include "kvm_private.h" | |||
64 | ||||
65 | extern int __fdnlist(int, struct nlist *); | |||
66 | ||||
67 | static int kvm_dbopen(kvm_t *, const char *); | |||
68 | static int kvm_opennamelist(kvm_t *, const char *); | |||
69 | static int _kvm_get_header(kvm_t *); | |||
70 | static kvm_t *_kvm_open(kvm_t *, const char *, const char *, const char *, | |||
71 | int, char *); | |||
72 | static int clear_gap(kvm_t *, FILE *, int); | |||
73 | ||||
74 | char * | |||
75 | kvm_geterr(kvm_t *kd) | |||
76 | { | |||
77 | return (kd->errbuf); | |||
78 | } | |||
79 | ||||
80 | /* | |||
81 | * Wrapper around pread. | |||
82 | */ | |||
83 | ssize_t | |||
84 | _kvm_pread(kvm_t *kd, int fd, void *buf, size_t nbytes, off_t offset) | |||
85 | { | |||
86 | ssize_t rval; | |||
87 | ||||
88 | errno(*__errno()) = 0; | |||
89 | rval = pread(fd, buf, nbytes, offset); | |||
90 | if (rval == -1 || errno(*__errno()) != 0) { | |||
91 | _kvm_syserr(kd, kd->program, "pread"); | |||
92 | } | |||
93 | return (rval); | |||
94 | } | |||
95 | ||||
96 | /* | |||
97 | * Wrapper around pwrite. | |||
98 | */ | |||
99 | ssize_t | |||
100 | _kvm_pwrite(kvm_t *kd, int fd, const void *buf, size_t nbytes, off_t offset) | |||
101 | { | |||
102 | ssize_t rval; | |||
103 | ||||
104 | errno(*__errno()) = 0; | |||
105 | rval = pwrite(fd, buf, nbytes, offset); | |||
106 | if (rval == -1 || errno(*__errno()) != 0) { | |||
107 | _kvm_syserr(kd, kd->program, "pwrite"); | |||
108 | } | |||
109 | return (rval); | |||
110 | } | |||
111 | ||||
112 | /* | |||
113 | * Report an error using printf style arguments. "program" is kd->program | |||
114 | * on hard errors, and 0 on soft errors, so that under sun error emulation, | |||
115 | * only hard errors are printed out (otherwise, programs like gdb will | |||
116 | * generate tons of error messages when trying to access bogus pointers). | |||
117 | */ | |||
118 | void | |||
119 | _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...) | |||
120 | { | |||
121 | va_list ap; | |||
122 | ||||
123 | va_start(ap, fmt)__builtin_va_start(ap, fmt); | |||
124 | if (program != NULL((void*)0)) { | |||
125 | (void)fprintf(stderr(&__sF[2]), "%s: ", program); | |||
126 | (void)vfprintf(stderr(&__sF[2]), fmt, ap); | |||
127 | (void)fputc('\n', stderr(&__sF[2])); | |||
128 | } else | |||
129 | (void)vsnprintf(kd->errbuf, | |||
130 | sizeof(kd->errbuf), fmt, ap); | |||
131 | ||||
132 | va_end(ap)__builtin_va_end(ap); | |||
133 | } | |||
134 | ||||
135 | void | |||
136 | _kvm_syserr(kvm_t *kd, const char *program, const char *fmt, ...) | |||
137 | { | |||
138 | va_list ap; | |||
139 | size_t n; | |||
140 | ||||
141 | va_start(ap, fmt)__builtin_va_start(ap, fmt); | |||
142 | if (program != NULL((void*)0)) { | |||
143 | (void)fprintf(stderr(&__sF[2]), "%s: ", program); | |||
144 | (void)vfprintf(stderr(&__sF[2]), fmt, ap); | |||
145 | (void)fprintf(stderr(&__sF[2]), ": %s\n", strerror(errno(*__errno()))); | |||
146 | } else { | |||
147 | char *cp = kd->errbuf; | |||
148 | ||||
149 | (void)vsnprintf(cp, sizeof(kd->errbuf), fmt, ap); | |||
150 | n = strlen(cp); | |||
151 | (void)snprintf(&cp[n], sizeof(kd->errbuf) - n, ": %s", | |||
152 | strerror(errno(*__errno()))); | |||
153 | } | |||
154 | va_end(ap)__builtin_va_end(ap); | |||
155 | } | |||
156 | ||||
157 | void * | |||
158 | _kvm_malloc(kvm_t *kd, size_t n) | |||
159 | { | |||
160 | void *p; | |||
161 | ||||
162 | if ((p = malloc(n)) == NULL((void*)0)) | |||
163 | _kvm_err(kd, kd->program, "%s", strerror(errno(*__errno()))); | |||
164 | return (p); | |||
165 | } | |||
166 | ||||
167 | void * | |||
168 | _kvm_realloc(kvm_t *kd, void *p, size_t n) | |||
169 | { | |||
170 | if ((p = realloc(p, n)) == NULL((void*)0)) | |||
171 | _kvm_err(kd, kd->program, "%s", strerror(errno(*__errno()))); | |||
172 | return (p); | |||
173 | } | |||
174 | ||||
175 | static kvm_t * | |||
176 | _kvm_open(kvm_t *kd, const char *uf, const char *mf, const char *sf, | |||
177 | int flag, char *errout) | |||
178 | { | |||
179 | struct stat st; | |||
180 | ||||
181 | kd->db = 0; | |||
182 | kd->pmfd = -1; | |||
183 | kd->vmfd = -1; | |||
184 | kd->swfd = -1; | |||
185 | kd->nlfd = -1; | |||
186 | kd->alive = 0; | |||
187 | kd->filebase = NULL((void*)0); | |||
188 | kd->procbase = NULL((void*)0); | |||
189 | kd->nbpg = getpagesize(); | |||
190 | kd->swapspc = 0; | |||
191 | kd->argspc = 0; | |||
192 | kd->argbuf = 0; | |||
193 | kd->argv = 0; | |||
194 | kd->envspc = 0; | |||
195 | kd->envbuf = 0; | |||
196 | kd->envp = 0; | |||
197 | kd->vmst = NULL((void*)0); | |||
198 | kd->vm_page_buckets = 0; | |||
199 | kd->kcore_hdr = 0; | |||
200 | kd->cpu_dsize = 0; | |||
201 | kd->cpu_data = 0; | |||
202 | kd->dump_off = 0; | |||
203 | ||||
204 | if (flag & KVM_NO_FILES0x80000000) { | |||
205 | kd->alive = 1; | |||
206 | return (kd); | |||
207 | } | |||
208 | ||||
209 | if (uf && strlen(uf) >= PATH_MAX1024) { | |||
210 | _kvm_err(kd, kd->program, "exec file name too long"); | |||
211 | goto failed; | |||
212 | } | |||
213 | if (flag != O_RDONLY0x0000 && flag != O_WRONLY0x0001 && flag != O_RDWR0x0002) { | |||
214 | _kvm_err(kd, kd->program, "bad flags arg"); | |||
215 | goto failed; | |||
216 | } | |||
217 | flag |= O_CLOEXEC0x10000; | |||
218 | ||||
219 | if (mf == NULL((void*)0)) | |||
220 | mf = _PATH_MEM"/dev/mem"; | |||
221 | ||||
222 | if ((kd->pmfd = open(mf, flag)) == -1) { | |||
223 | _kvm_syserr(kd, kd->program, "%s", mf); | |||
224 | goto failed; | |||
225 | } | |||
226 | if (fstat(kd->pmfd, &st) == -1) { | |||
227 | _kvm_syserr(kd, kd->program, "%s", mf); | |||
228 | goto failed; | |||
229 | } | |||
230 | if (S_ISCHR(st.st_mode)((st.st_mode & 0170000) == 0020000)) { | |||
231 | /* | |||
232 | * If this is a character special device, then check that | |||
233 | * it's /dev/mem. If so, open kmem too. (Maybe we should | |||
234 | * make it work for either /dev/mem or /dev/kmem -- in either | |||
235 | * case you're working with a live kernel.) | |||
236 | */ | |||
237 | if (strcmp(mf, _PATH_MEM"/dev/mem") != 0) { /* XXX */ | |||
238 | _kvm_err(kd, kd->program, | |||
239 | "%s: not physical memory device", mf); | |||
240 | goto failed; | |||
241 | } | |||
242 | if ((kd->vmfd = open(_PATH_KMEM"/dev/kmem", flag)) == -1) { | |||
243 | _kvm_syserr(kd, kd->program, "%s", _PATH_KMEM"/dev/kmem"); | |||
244 | goto failed; | |||
245 | } | |||
246 | kd->alive = 1; | |||
247 | if (sf != NULL((void*)0) && (kd->swfd = open(sf, flag)) == -1) { | |||
248 | _kvm_syserr(kd, kd->program, "%s", sf); | |||
249 | goto failed; | |||
250 | } | |||
251 | /* | |||
252 | * Open kvm nlist database. We only try to use | |||
253 | * the pre-built database if the namelist file name | |||
254 | * pointer is NULL. If the database cannot or should | |||
255 | * not be opened, open the namelist argument so we | |||
256 | * revert to slow nlist() calls. | |||
257 | * If no file is specified, try opening _PATH_KSYMS and | |||
258 | * fall back to _PATH_UNIX. | |||
259 | */ | |||
260 | if (kvm_dbopen(kd, uf ? uf : _PATH_UNIX"/bsd") == -1 && | |||
261 | kvm_opennamelist(kd, uf)) | |||
262 | goto failed; | |||
263 | } else { | |||
264 | /* | |||
265 | * This is a crash dump. | |||
266 | * Initialize the virtual address translation machinery, | |||
267 | * but first setup the namelist fd. | |||
268 | * If no file is specified, try opening _PATH_KSYMS and | |||
269 | * fall back to _PATH_UNIX. | |||
270 | */ | |||
271 | if (kvm_opennamelist(kd, uf)) | |||
272 | goto failed; | |||
273 | ||||
274 | /* | |||
275 | * If there is no valid core header, fail silently here. | |||
276 | * The address translations however will fail without | |||
277 | * header. Things can be made to run by calling | |||
278 | * kvm_dump_mkheader() before doing any translation. | |||
279 | */ | |||
280 | if (_kvm_get_header(kd) == 0) { | |||
281 | if (_kvm_initvtop(kd) < 0) | |||
282 | goto failed; | |||
283 | } | |||
284 | } | |||
285 | return (kd); | |||
286 | failed: | |||
287 | /* | |||
288 | * Copy out the error if doing sane error semantics. | |||
289 | */ | |||
290 | if (errout != 0) | |||
291 | (void)strlcpy(errout, kd->errbuf, _POSIX2_LINE_MAX2048); | |||
292 | (void)kvm_close(kd); | |||
293 | return (0); | |||
294 | } | |||
295 | ||||
296 | static int | |||
297 | kvm_opennamelist(kvm_t *kd, const char *uf) | |||
298 | { | |||
299 | int fd; | |||
300 | ||||
301 | if (uf != NULL((void*)0)) | |||
302 | fd = open(uf, O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
303 | else { | |||
304 | fd = open(_PATH_KSYMS"/dev/ksyms", O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
305 | uf = _PATH_UNIX"/bsd"; | |||
306 | if (fd == -1) | |||
307 | fd = open(uf, O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
308 | } | |||
309 | if (fd == -1) { | |||
310 | _kvm_syserr(kd, kd->program, "%s", uf); | |||
311 | return (-1); | |||
312 | } | |||
313 | ||||
314 | kd->nlfd = fd; | |||
315 | return (0); | |||
316 | } | |||
317 | ||||
318 | /* | |||
319 | * The kernel dump file (from savecore) contains: | |||
320 | * kcore_hdr_t kcore_hdr; | |||
321 | * kcore_seg_t cpu_hdr; | |||
322 | * (opaque) cpu_data; (size is cpu_hdr.c_size) | |||
323 | * kcore_seg_t mem_hdr; | |||
324 | * (memory) mem_data; (size is mem_hdr.c_size) | |||
325 | * | |||
326 | * Note: khdr is padded to khdr.c_hdrsize; | |||
327 | * cpu_hdr and mem_hdr are padded to khdr.c_seghdrsize | |||
328 | */ | |||
329 | static int | |||
330 | _kvm_get_header(kvm_t *kd) | |||
331 | { | |||
332 | kcore_hdr_t kcore_hdr; | |||
333 | kcore_seg_t cpu_hdr; | |||
334 | kcore_seg_t mem_hdr; | |||
335 | size_t offset; | |||
336 | ssize_t sz; | |||
337 | ||||
338 | /* | |||
339 | * Read the kcore_hdr_t | |||
340 | */ | |||
341 | sz = _kvm_pread(kd, kd->pmfd, &kcore_hdr, sizeof(kcore_hdr), (off_t)0); | |||
342 | if (sz != sizeof(kcore_hdr)) { | |||
343 | return (-1); | |||
344 | } | |||
345 | ||||
346 | /* | |||
347 | * Currently, we only support dump-files made by the current | |||
348 | * architecture... | |||
349 | */ | |||
350 | if ((CORE_GETMAGIC(kcore_hdr)( (__uint32_t)(__builtin_constant_p(((kcore_hdr).c_midmag)) ? (__uint32_t)(((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff ) << 24 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff00 ) << 8 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff0000 ) >> 8 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff000000 ) >> 24) : __swap32md(((kcore_hdr).c_midmag))) & 0xffff ) != KCORE_MAGIC0x8fca) || | |||
351 | (CORE_GETMID(kcore_hdr)( ((__uint32_t)(__builtin_constant_p(((kcore_hdr).c_midmag)) ? (__uint32_t)(((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff ) << 24 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff00 ) << 8 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff0000 ) >> 8 | ((__uint32_t)(((kcore_hdr).c_midmag)) & 0xff000000 ) >> 24) : __swap32md(((kcore_hdr).c_midmag))) >> 16) & 0x03ff ) != MID_MACHINE157)) | |||
352 | return (-1); | |||
353 | ||||
354 | /* | |||
355 | * Currently, we only support exactly 2 segments: cpu-segment | |||
356 | * and data-segment in exactly that order. | |||
357 | */ | |||
358 | if (kcore_hdr.c_nseg != 2) | |||
359 | return (-1); | |||
360 | ||||
361 | /* | |||
362 | * Save away the kcore_hdr. All errors after this | |||
363 | * should do a to "goto fail" to deallocate things. | |||
364 | */ | |||
365 | kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr)); | |||
366 | if (kd->kcore_hdr == NULL((void*)0)) | |||
367 | goto fail; | |||
368 | memcpy(kd->kcore_hdr, &kcore_hdr, sizeof(kcore_hdr)); | |||
369 | offset = kcore_hdr.c_hdrsize; | |||
370 | ||||
371 | /* | |||
372 | * Read the CPU segment header | |||
373 | */ | |||
374 | sz = _kvm_pread(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr), (off_t)offset); | |||
375 | if (sz != sizeof(cpu_hdr)) { | |||
376 | goto fail; | |||
377 | } | |||
378 | ||||
379 | if ((CORE_GETMAGIC(cpu_hdr)( (__uint32_t)(__builtin_constant_p(((cpu_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((cpu_hdr).c_midmag))) & 0xffff ) != KCORESEG_MAGIC0x8fac) || | |||
380 | (CORE_GETFLAG(cpu_hdr)( ((__uint32_t)(__builtin_constant_p(((cpu_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((cpu_hdr).c_midmag))) >> 26) & 0x03f ) != CORE_CPU1)) | |||
381 | goto fail; | |||
382 | offset += kcore_hdr.c_seghdrsize; | |||
383 | ||||
384 | /* | |||
385 | * Read the CPU segment DATA. | |||
386 | */ | |||
387 | kd->cpu_dsize = cpu_hdr.c_size; | |||
388 | kd->cpu_data = _kvm_malloc(kd, (size_t)cpu_hdr.c_size); | |||
389 | if (kd->cpu_data == NULL((void*)0)) | |||
390 | goto fail; | |||
391 | ||||
392 | sz = _kvm_pread(kd, kd->pmfd, kd->cpu_data, (size_t)cpu_hdr.c_size, | |||
393 | (off_t)offset); | |||
394 | if (sz != (size_t)cpu_hdr.c_size) { | |||
395 | goto fail; | |||
396 | } | |||
397 | ||||
398 | offset += cpu_hdr.c_size; | |||
399 | ||||
400 | /* | |||
401 | * Read the next segment header: data segment | |||
402 | */ | |||
403 | sz = _kvm_pread(kd, kd->pmfd, &mem_hdr, sizeof(mem_hdr), (off_t)offset); | |||
404 | if (sz != sizeof(mem_hdr)) { | |||
405 | goto fail; | |||
406 | } | |||
407 | ||||
408 | offset += kcore_hdr.c_seghdrsize; | |||
409 | ||||
410 | if ((CORE_GETMAGIC(mem_hdr)( (__uint32_t)(__builtin_constant_p(((mem_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((mem_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((mem_hdr).c_midmag))) & 0xffff ) != KCORESEG_MAGIC0x8fac) || | |||
411 | (CORE_GETFLAG(mem_hdr)( ((__uint32_t)(__builtin_constant_p(((mem_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((mem_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((mem_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((mem_hdr).c_midmag))) >> 26) & 0x03f ) != CORE_DATA2)) | |||
412 | goto fail; | |||
413 | ||||
414 | kd->dump_off = offset; | |||
415 | return (0); | |||
416 | ||||
417 | fail: | |||
418 | free(kd->kcore_hdr); | |||
419 | kd->kcore_hdr = NULL((void*)0); | |||
420 | if (kd->cpu_data != NULL((void*)0)) { | |||
421 | free(kd->cpu_data); | |||
422 | kd->cpu_data = NULL((void*)0); | |||
423 | kd->cpu_dsize = 0; | |||
424 | } | |||
425 | ||||
426 | return (-1); | |||
427 | } | |||
428 | ||||
429 | /* | |||
430 | * The format while on the dump device is: (new format) | |||
431 | * kcore_seg_t cpu_hdr; | |||
432 | * (opaque) cpu_data; (size is cpu_hdr.c_size) | |||
433 | * kcore_seg_t mem_hdr; | |||
434 | * (memory) mem_data; (size is mem_hdr.c_size) | |||
435 | */ | |||
436 | int | |||
437 | kvm_dump_mkheader(kvm_t *kd, off_t dump_off) | |||
438 | { | |||
439 | kcore_seg_t cpu_hdr; | |||
440 | int hdr_size; | |||
441 | ssize_t sz; | |||
442 | ||||
443 | if (kd->kcore_hdr != NULL((void*)0)) { | |||
444 | _kvm_err(kd, kd->program, "already has a dump header"); | |||
445 | return (-1); | |||
446 | } | |||
447 | if (ISALIVE(kd)((kd)->alive)) { | |||
448 | _kvm_err(kd, kd->program, "don't use on live kernel"); | |||
449 | return (-1); | |||
450 | } | |||
451 | ||||
452 | /* | |||
453 | * Validate new format crash dump | |||
454 | */ | |||
455 | sz = _kvm_pread(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr), (off_t)dump_off); | |||
456 | if (sz != sizeof(cpu_hdr)) { | |||
457 | return (-1); | |||
458 | } | |||
459 | if ((CORE_GETMAGIC(cpu_hdr)( (__uint32_t)(__builtin_constant_p(((cpu_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((cpu_hdr).c_midmag))) & 0xffff ) != KCORE_MAGIC0x8fca) | |||
460 | || (CORE_GETMID(cpu_hdr)( ((__uint32_t)(__builtin_constant_p(((cpu_hdr).c_midmag)) ? ( __uint32_t)(((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff) << 24 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff00) << 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff0000) >> 8 | ((__uint32_t)(((cpu_hdr).c_midmag)) & 0xff000000) >> 24) : __swap32md(((cpu_hdr).c_midmag))) >> 16) & 0x03ff ) != MID_MACHINE157)) { | |||
461 | _kvm_err(kd, 0, "invalid magic in cpu_hdr"); | |||
462 | return (-1); | |||
463 | } | |||
464 | hdr_size = _ALIGN(sizeof(cpu_hdr))(((unsigned long)(sizeof(cpu_hdr)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
465 | ||||
466 | /* | |||
467 | * Read the CPU segment. | |||
468 | */ | |||
469 | kd->cpu_dsize = cpu_hdr.c_size; | |||
470 | kd->cpu_data = _kvm_malloc(kd, kd->cpu_dsize); | |||
471 | if (kd->cpu_data == NULL((void*)0)) | |||
472 | goto fail; | |||
473 | ||||
474 | sz = _kvm_pread(kd, kd->pmfd, kd->cpu_data, (size_t)cpu_hdr.c_size, | |||
475 | (off_t)dump_off+hdr_size); | |||
476 | if (sz != (ssize_t)cpu_hdr.c_size) { | |||
477 | _kvm_err(kd, 0, "invalid size in cpu_hdr"); | |||
478 | goto fail; | |||
479 | } | |||
480 | hdr_size += kd->cpu_dsize; | |||
481 | ||||
482 | /* | |||
483 | * Leave phys mem pointer at beginning of memory data | |||
484 | */ | |||
485 | kd->dump_off = dump_off + hdr_size; | |||
486 | errno(*__errno()) = 0; | |||
487 | if (lseek(kd->pmfd, kd->dump_off, SEEK_SET0) != kd->dump_off && errno(*__errno()) != 0) { | |||
488 | _kvm_err(kd, 0, "invalid dump offset - lseek"); | |||
489 | goto fail; | |||
490 | } | |||
491 | ||||
492 | /* | |||
493 | * Create a kcore_hdr. | |||
494 | */ | |||
495 | kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr_t)); | |||
496 | if (kd->kcore_hdr == NULL((void*)0)) | |||
497 | goto fail; | |||
498 | ||||
499 | kd->kcore_hdr->c_hdrsize = _ALIGN(sizeof(kcore_hdr_t))(((unsigned long)(sizeof(kcore_hdr_t)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
500 | kd->kcore_hdr->c_seghdrsize = _ALIGN(sizeof(kcore_seg_t))(((unsigned long)(sizeof(kcore_seg_t)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
501 | kd->kcore_hdr->c_nseg = 2; | |||
502 | CORE_SETMAGIC(*(kd->kcore_hdr), KCORE_MAGIC, MID_MACHINE,0)( (*(kd->kcore_hdr)).c_midmag = (__uint32_t)(__builtin_constant_p (( ((0) & 0x3f) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca) & 0xffff) )) ? (__uint32_t)(((__uint32_t )(( ((0) & 0x3f) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca) & 0xffff) )) & 0xff) << 24 | ((__uint32_t)(( ((0) & 0x3f) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca) & 0xffff) )) & 0xff00 ) << 8 | ((__uint32_t)(( ((0) & 0x3f) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca) & 0xffff ) )) & 0xff0000) >> 8 | ((__uint32_t)(( ((0) & 0x3f ) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca ) & 0xffff) )) & 0xff000000) >> 24) : __swap32md (( ((0) & 0x3f) << 26) | ( ((157) & 0x03ff) << 16) | ( ((0x8fca) & 0xffff) ))) ); | |||
503 | ||||
504 | /* | |||
505 | * Now that we have a valid header, enable translations. | |||
506 | */ | |||
507 | if (_kvm_initvtop(kd) == 0) | |||
508 | /* Success */ | |||
509 | return (hdr_size); | |||
510 | ||||
511 | fail: | |||
512 | free(kd->kcore_hdr); | |||
513 | kd->kcore_hdr = NULL((void*)0); | |||
514 | if (kd->cpu_data != NULL((void*)0)) { | |||
515 | free(kd->cpu_data); | |||
516 | kd->cpu_data = NULL((void*)0); | |||
517 | kd->cpu_dsize = 0; | |||
518 | } | |||
519 | return (-1); | |||
520 | } | |||
521 | ||||
522 | static int | |||
523 | clear_gap(kvm_t *kd, FILE *fp, int size) | |||
524 | { | |||
525 | if (size <= 0) /* XXX - < 0 should never happen */ | |||
526 | return (0); | |||
527 | while (size-- > 0) { | |||
528 | if (fputc(0, fp) == EOF(-1)) { | |||
529 | _kvm_syserr(kd, kd->program, "clear_gap"); | |||
530 | return (-1); | |||
531 | } | |||
532 | } | |||
533 | return (0); | |||
534 | } | |||
535 | ||||
536 | /* | |||
537 | * Write the dump header info to 'fp'. Note that we can't use fseek(3) here | |||
538 | * because 'fp' might be a file pointer obtained by zopen(). | |||
539 | */ | |||
540 | int | |||
541 | kvm_dump_wrtheader(kvm_t *kd, FILE *fp, int dumpsize) | |||
542 | { | |||
543 | kcore_seg_t seghdr; | |||
544 | long offset; | |||
545 | int gap; | |||
546 | ||||
547 | if (kd->kcore_hdr == NULL((void*)0) || kd->cpu_data == NULL((void*)0)) { | |||
548 | _kvm_err(kd, kd->program, "no valid dump header(s)"); | |||
549 | return (-1); | |||
550 | } | |||
551 | ||||
552 | /* | |||
553 | * Write the generic header | |||
554 | */ | |||
555 | offset = 0; | |||
556 | if (fwrite(kd->kcore_hdr, sizeof(kcore_hdr_t), 1, fp) < 1) { | |||
557 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
558 | return (-1); | |||
559 | } | |||
560 | offset += kd->kcore_hdr->c_hdrsize; | |||
561 | gap = kd->kcore_hdr->c_hdrsize - sizeof(kcore_hdr_t); | |||
562 | if (clear_gap(kd, fp, gap) == -1) | |||
563 | return (-1); | |||
564 | ||||
565 | /* | |||
566 | * Write the cpu header | |||
567 | */ | |||
568 | CORE_SETMAGIC(seghdr, KCORESEG_MAGIC, 0, CORE_CPU)( (seghdr).c_midmag = (__uint32_t)(__builtin_constant_p(( ((1 ) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16 ) | ( ((0x8fac) & 0xffff) )) ? (__uint32_t)(((__uint32_t) (( ((1) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) )) & 0xff) << 24 | ((__uint32_t)(( ((1) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) )) & 0xff00 ) << 8 | ((__uint32_t)(( ((1) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff ) )) & 0xff0000) >> 8 | ((__uint32_t)(( ((1) & 0x3f ) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac ) & 0xffff) )) & 0xff000000) >> 24) : __swap32md (( ((1) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) ))) ); | |||
569 | seghdr.c_size = (u_long)_ALIGN(kd->cpu_dsize)(((unsigned long)(kd->cpu_dsize) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
570 | if (fwrite(&seghdr, sizeof(seghdr), 1, fp) < 1) { | |||
571 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
572 | return (-1); | |||
573 | } | |||
574 | offset += kd->kcore_hdr->c_seghdrsize; | |||
575 | gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr); | |||
576 | if (clear_gap(kd, fp, gap) == -1) | |||
577 | return (-1); | |||
578 | ||||
579 | if (fwrite(kd->cpu_data, kd->cpu_dsize, 1, fp) < 1) { | |||
580 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
581 | return (-1); | |||
582 | } | |||
583 | offset += seghdr.c_size; | |||
584 | gap = seghdr.c_size - kd->cpu_dsize; | |||
585 | if (clear_gap(kd, fp, gap) == -1) | |||
586 | return (-1); | |||
587 | ||||
588 | /* | |||
589 | * Write the actual dump data segment header | |||
590 | */ | |||
591 | CORE_SETMAGIC(seghdr, KCORESEG_MAGIC, 0, CORE_DATA)( (seghdr).c_midmag = (__uint32_t)(__builtin_constant_p(( ((2 ) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16 ) | ( ((0x8fac) & 0xffff) )) ? (__uint32_t)(((__uint32_t) (( ((2) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) )) & 0xff) << 24 | ((__uint32_t)(( ((2) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) )) & 0xff00 ) << 8 | ((__uint32_t)(( ((2) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff ) )) & 0xff0000) >> 8 | ((__uint32_t)(( ((2) & 0x3f ) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac ) & 0xffff) )) & 0xff000000) >> 24) : __swap32md (( ((2) & 0x3f) << 26) | ( ((0) & 0x03ff) << 16) | ( ((0x8fac) & 0xffff) ))) ); | |||
592 | seghdr.c_size = dumpsize; | |||
593 | if (fwrite(&seghdr, sizeof(seghdr), 1, fp) < 1) { | |||
594 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
595 | return (-1); | |||
596 | } | |||
597 | offset += kd->kcore_hdr->c_seghdrsize; | |||
598 | gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr); | |||
599 | if (clear_gap(kd, fp, gap) == -1) | |||
600 | return (-1); | |||
601 | ||||
602 | return (offset); | |||
603 | } | |||
604 | ||||
605 | kvm_t * | |||
606 | kvm_openfiles(const char *uf, const char *mf, const char *sf, | |||
607 | int flag, char *errout) | |||
608 | { | |||
609 | kvm_t *kd; | |||
610 | ||||
611 | if ((kd = malloc(sizeof(*kd))) == NULL((void*)0)) { | |||
612 | (void)strlcpy(errout, strerror(errno(*__errno())), _POSIX2_LINE_MAX2048); | |||
613 | return (0); | |||
614 | } | |||
615 | kd->program = 0; | |||
616 | return (_kvm_open(kd, uf, mf, sf, flag, errout)); | |||
617 | } | |||
618 | ||||
619 | kvm_t * | |||
620 | kvm_open(const char *uf, const char *mf, const char *sf, int flag, | |||
621 | const char *program) | |||
622 | { | |||
623 | kvm_t *kd; | |||
624 | ||||
625 | if ((kd = malloc(sizeof(*kd))) == NULL((void*)0) && program != NULL((void*)0)) { | |||
| ||||
626 | (void)fprintf(stderr(&__sF[2]), "%s: %s\n", program, strerror(errno(*__errno()))); | |||
627 | return (0); | |||
628 | } | |||
629 | kd->program = program; | |||
| ||||
630 | return (_kvm_open(kd, uf, mf, sf, flag, NULL((void*)0))); | |||
631 | } | |||
632 | ||||
633 | int | |||
634 | kvm_close(kvm_t *kd) | |||
635 | { | |||
636 | int error = 0; | |||
637 | ||||
638 | if (kd->pmfd >= 0) | |||
639 | error |= close(kd->pmfd); | |||
640 | if (kd->vmfd >= 0) | |||
641 | error |= close(kd->vmfd); | |||
642 | kd->alive = 0; | |||
643 | if (kd->nlfd >= 0) | |||
644 | error |= close(kd->nlfd); | |||
645 | if (kd->swfd >= 0) | |||
646 | error |= close(kd->swfd); | |||
647 | if (kd->db != 0) | |||
648 | error |= (kd->db->close)(kd->db); | |||
649 | if (kd->vmst) | |||
650 | _kvm_freevtop(kd); | |||
651 | kd->cpu_dsize = 0; | |||
652 | free(kd->cpu_data); | |||
653 | free(kd->kcore_hdr); | |||
654 | free(kd->filebase); | |||
655 | free(kd->procbase); | |||
656 | free(kd->swapspc); | |||
657 | free(kd->argspc); | |||
658 | free(kd->argbuf); | |||
659 | free(kd->argv); | |||
660 | free(kd->envspc); | |||
661 | free(kd->envbuf); | |||
662 | free(kd->envp); | |||
663 | free(kd); | |||
664 | ||||
665 | return (error); | |||
666 | } | |||
667 | DEF(kvm_close)__asm__(".global " "kvm_close" " ; " "kvm_close" " = " "__kvm_close" ); | |||
668 | ||||
669 | /* | |||
670 | * Set up state necessary to do queries on the kernel namelist | |||
671 | * data base. If the data base is out-of-data/incompatible with | |||
672 | * given executable, set up things so we revert to standard nlist call. | |||
673 | * Only called for live kernels. Return 0 on success, -1 on failure. | |||
674 | */ | |||
675 | static int | |||
676 | kvm_dbopen(kvm_t *kd, const char *uf) | |||
677 | { | |||
678 | char dbversion[_POSIX2_LINE_MAX2048], kversion[_POSIX2_LINE_MAX2048]; | |||
679 | char dbname[PATH_MAX1024], ufbuf[PATH_MAX1024]; | |||
680 | struct nlist nitem; | |||
681 | size_t dbversionlen; | |||
682 | DBT rec; | |||
683 | ||||
684 | strlcpy(ufbuf, uf, sizeof(ufbuf)); | |||
685 | uf = basename(ufbuf); | |||
686 | ||||
687 | (void)snprintf(dbname, sizeof(dbname), "%skvm_%s.db", _PATH_VARDB"/var/db/", uf); | |||
688 | kd->db = dbopen(dbname, O_RDONLY0x0000, 0, DB_HASH, NULL((void*)0)); | |||
689 | if (kd->db == NULL((void*)0)) { | |||
690 | switch (errno(*__errno())) { | |||
691 | case ENOENT2: | |||
692 | /* No kvm_bsd.db, fall back to /bsd silently */ | |||
693 | break; | |||
694 | case EFTYPE79: | |||
695 | _kvm_err(kd, kd->program, | |||
696 | "file %s is incorrectly formatted", dbname); | |||
697 | break; | |||
698 | case EINVAL22: | |||
699 | _kvm_err(kd, kd->program, | |||
700 | "invalid argument to dbopen()"); | |||
701 | break; | |||
702 | default: | |||
703 | _kvm_err(kd, kd->program, "unknown dbopen() error"); | |||
704 | break; | |||
705 | } | |||
706 | return (-1); | |||
707 | } | |||
708 | ||||
709 | /* | |||
710 | * read version out of database | |||
711 | */ | |||
712 | rec.data = VRS_KEY"VERSION"; | |||
713 | rec.size = sizeof(VRS_KEY"VERSION") - 1; | |||
714 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
715 | goto close; | |||
716 | if (rec.data == 0 || rec.size > sizeof(dbversion)) | |||
717 | goto close; | |||
718 | ||||
719 | bcopy(rec.data, dbversion, rec.size); | |||
720 | dbversionlen = rec.size; | |||
721 | ||||
722 | /* | |||
723 | * Read version string from kernel memory. | |||
724 | * Since we are dealing with a live kernel, we can call kvm_read() | |||
725 | * at this point. | |||
726 | */ | |||
727 | rec.data = VRS_SYM"_version"; | |||
728 | rec.size = sizeof(VRS_SYM"_version") - 1; | |||
729 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
730 | goto close; | |||
731 | if (rec.data == 0 || rec.size != sizeof(struct nlist)) | |||
732 | goto close; | |||
733 | bcopy(rec.data, &nitem, sizeof(nitem)); | |||
734 | if (kvm_read(kd, (u_long)nitem.n_value, kversion, dbversionlen) != | |||
735 | dbversionlen) | |||
736 | goto close; | |||
737 | /* | |||
738 | * If they match, we win - otherwise clear out kd->db so | |||
739 | * we revert to slow nlist(). | |||
740 | */ | |||
741 | if (bcmp(dbversion, kversion, dbversionlen) == 0) | |||
742 | return (0); | |||
743 | close: | |||
744 | (void)(kd->db->close)(kd->db); | |||
745 | kd->db = 0; | |||
746 | ||||
747 | return (-1); | |||
748 | } | |||
749 | ||||
750 | int | |||
751 | kvm_nlist(kvm_t *kd, struct nlist *nl) | |||
752 | { | |||
753 | struct nlist *p; | |||
754 | int nvalid, rv; | |||
755 | ||||
756 | /* | |||
757 | * If we can't use the data base, revert to the | |||
758 | * slow library call. | |||
759 | */ | |||
760 | if (kd->db == 0) { | |||
761 | rv = __fdnlist(kd->nlfd, nl); | |||
762 | if (rv == -1) | |||
763 | _kvm_err(kd, 0, "bad namelist"); | |||
764 | return (rv); | |||
765 | } | |||
766 | ||||
767 | /* | |||
768 | * We can use the kvm data base. Go through each nlist entry | |||
769 | * and look it up with a db query. | |||
770 | */ | |||
771 | nvalid = 0; | |||
772 | for (p = nl; p->n_name && p->n_name[0]; ++p) { | |||
773 | size_t len; | |||
774 | DBT rec; | |||
775 | ||||
776 | if ((len = strlen(p->n_name)) > 4096) { | |||
777 | /* sanity */ | |||
778 | _kvm_err(kd, kd->program, "symbol too large"); | |||
779 | return (-1); | |||
780 | } | |||
781 | rec.data = p->n_name; | |||
782 | rec.size = len; | |||
783 | ||||
784 | /* | |||
785 | * Make sure that n_value = 0 when the symbol isn't found | |||
786 | */ | |||
787 | p->n_value = 0; | |||
788 | ||||
789 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
790 | continue; | |||
791 | if (rec.data == 0 || rec.size != sizeof(struct nlist)) | |||
792 | continue; | |||
793 | ++nvalid; | |||
794 | /* | |||
795 | * Avoid alignment issues. | |||
796 | */ | |||
797 | bcopy((char *)rec.data + offsetof(struct nlist, n_type)__builtin_offsetof(struct nlist, n_type), | |||
798 | &p->n_type, sizeof(p->n_type)); | |||
799 | bcopy((char *)rec.data + offsetof(struct nlist, n_value)__builtin_offsetof(struct nlist, n_value), | |||
800 | &p->n_value, sizeof(p->n_value)); | |||
801 | } | |||
802 | /* | |||
803 | * Return the number of entries that weren't found. | |||
804 | */ | |||
805 | return ((p - nl) - nvalid); | |||
806 | } | |||
807 | DEF(kvm_nlist)__asm__(".global " "kvm_nlist" " ; " "kvm_nlist" " = " "__kvm_nlist" ); | |||
808 | ||||
809 | int | |||
810 | kvm_dump_inval(kvm_t *kd) | |||
811 | { | |||
812 | struct nlist nl[2]; | |||
813 | u_long x; | |||
814 | paddr_t pa; | |||
815 | ||||
816 | if (ISALIVE(kd)((kd)->alive)) { | |||
817 | _kvm_err(kd, kd->program, "clearing dump on live kernel"); | |||
818 | return (-1); | |||
819 | } | |||
820 | nl[0].n_name = "_dumpmag"; | |||
821 | nl[1].n_name = NULL((void*)0); | |||
822 | ||||
823 | if (kvm_nlist(kd, nl) == -1) { | |||
824 | _kvm_err(kd, 0, "bad namelist"); | |||
825 | return (-1); | |||
826 | } | |||
827 | ||||
828 | if (nl[0].n_value == 0) { | |||
829 | _kvm_err(kd, nl[0].n_name, "not in name list"); | |||
830 | return (-1); | |||
831 | } | |||
832 | ||||
833 | if (_kvm_kvatop(kd, (u_long)nl[0].n_value, &pa) == 0) | |||
834 | return (-1); | |||
835 | ||||
836 | x = 0; | |||
837 | if (_kvm_pwrite(kd, kd->pmfd, &x, sizeof(x), | |||
838 | (off_t)_kvm_pa2off(kd, pa)) != sizeof(x)) { | |||
839 | _kvm_err(kd, 0, "cannot invalidate dump"); | |||
840 | return (-1); | |||
841 | } | |||
842 | return (0); | |||
843 | } | |||
844 | ||||
845 | ssize_t | |||
846 | kvm_read(kvm_t *kd, u_long kva, void *buf, size_t len) | |||
847 | { | |||
848 | ssize_t cc; | |||
849 | void *cp; | |||
850 | ||||
851 | if (ISALIVE(kd)((kd)->alive)) { | |||
852 | /* | |||
853 | * We're using /dev/kmem. Just read straight from the | |||
854 | * device and let the active kernel do the address translation. | |||
855 | */ | |||
856 | cc = _kvm_pread(kd, kd->vmfd, buf, len, (off_t)kva); | |||
857 | if (cc == -1) { | |||
858 | _kvm_err(kd, 0, "invalid address (%lx)", kva); | |||
859 | return (-1); | |||
860 | } else if (cc < len) | |||
861 | _kvm_err(kd, kd->program, "short read"); | |||
862 | return (cc); | |||
863 | } else { | |||
864 | if ((kd->kcore_hdr == NULL((void*)0)) || (kd->cpu_data == NULL((void*)0))) { | |||
865 | _kvm_err(kd, kd->program, "no valid dump header"); | |||
866 | return (-1); | |||
867 | } | |||
868 | cp = buf; | |||
869 | while (len > 0) { | |||
870 | paddr_t pa; | |||
871 | ||||
872 | /* In case of error, _kvm_kvatop sets the err string */ | |||
873 | cc = _kvm_kvatop(kd, kva, &pa); | |||
874 | if (cc == 0) | |||
875 | return (-1); | |||
876 | if (cc > len) | |||
877 | cc = len; | |||
878 | cc = _kvm_pread(kd, kd->pmfd, cp, (size_t)cc, | |||
879 | (off_t)_kvm_pa2off(kd, pa)); | |||
880 | if (cc == -1) { | |||
881 | _kvm_syserr(kd, 0, _PATH_MEM"/dev/mem"); | |||
882 | break; | |||
883 | } | |||
884 | /* | |||
885 | * If kvm_kvatop returns a bogus value or our core | |||
886 | * file is truncated, we might wind up seeking beyond | |||
887 | * the end of the core file in which case the read will | |||
888 | * return 0 (EOF). | |||
889 | */ | |||
890 | if (cc == 0) | |||
891 | break; | |||
892 | cp = (char *)cp + cc; | |||
893 | kva += cc; | |||
894 | len -= cc; | |||
895 | } | |||
896 | return ((char *)cp - (char *)buf); | |||
897 | } | |||
898 | /* NOTREACHED */ | |||
899 | } | |||
900 | DEF(kvm_read)__asm__(".global " "kvm_read" " ; " "kvm_read" " = " "__kvm_read" ); | |||
901 | ||||
902 | ssize_t | |||
903 | kvm_write(kvm_t *kd, u_long kva, const void *buf, size_t len) | |||
904 | { | |||
905 | int cc; | |||
906 | ||||
907 | if (ISALIVE(kd)((kd)->alive)) { | |||
908 | /* | |||
909 | * Just like kvm_read, only we write. | |||
910 | */ | |||
911 | cc = _kvm_pwrite(kd, kd->vmfd, buf, len, (off_t)kva); | |||
912 | if (cc == -1) { | |||
913 | _kvm_err(kd, 0, "invalid address (%lx)", kva); | |||
914 | return (-1); | |||
915 | } else if (cc < len) | |||
916 | _kvm_err(kd, kd->program, "short write"); | |||
917 | return (cc); | |||
918 | } else { | |||
919 | _kvm_err(kd, kd->program, | |||
920 | "kvm_write not implemented for dead kernels"); | |||
921 | return (-1); | |||
922 | } | |||
923 | /* NOTREACHED */ | |||
924 | } |