| File: | src/lib/libkvm/kvm.c |
| Warning: | line 631, 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 1.72 2022/02/22 17:35:01 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> /* MID_MACHINE */ | |||
| 38 | #include <sys/types.h> | |||
| 39 | #include <sys/signal.h> | |||
| 40 | #include <sys/proc.h> | |||
| 41 | #include <sys/ioctl.h> | |||
| 42 | #include <sys/stat.h> | |||
| 43 | #include <sys/sysctl.h> | |||
| 44 | ||||
| 45 | #include <sys/core.h> | |||
| 46 | #include <sys/exec.h> | |||
| 47 | #include <sys/kcore.h> | |||
| 48 | ||||
| 49 | #include <stddef.h> | |||
| 50 | #include <errno(*__errno()).h> | |||
| 51 | #include <ctype.h> | |||
| 52 | #include <db.h> | |||
| 53 | #include <fcntl.h> | |||
| 54 | #include <libgen.h> | |||
| 55 | #include <limits.h> | |||
| 56 | #include <nlist.h> | |||
| 57 | #include <paths.h> | |||
| 58 | #include <stdio.h> | |||
| 59 | #include <stdlib.h> | |||
| 60 | #include <string.h> | |||
| 61 | #include <unistd.h> | |||
| 62 | #include <kvm.h> | |||
| 63 | #include <stdarg.h> | |||
| 64 | ||||
| 65 | #include "kvm_private.h" | |||
| 66 | ||||
| 67 | extern int __fdnlist(int, struct nlist *); | |||
| 68 | ||||
| 69 | static int kvm_dbopen(kvm_t *, const char *); | |||
| 70 | static int kvm_opennamelist(kvm_t *, const char *); | |||
| 71 | static int _kvm_get_header(kvm_t *); | |||
| 72 | static kvm_t *_kvm_open(kvm_t *, const char *, const char *, const char *, | |||
| 73 | int, char *); | |||
| 74 | static int clear_gap(kvm_t *, FILE *, int); | |||
| 75 | ||||
| 76 | char * | |||
| 77 | kvm_geterr(kvm_t *kd) | |||
| 78 | { | |||
| 79 | return (kd->errbuf); | |||
| 80 | } | |||
| 81 | ||||
| 82 | /* | |||
| 83 | * Wrapper around pread. | |||
| 84 | */ | |||
| 85 | ssize_t | |||
| 86 | _kvm_pread(kvm_t *kd, int fd, void *buf, size_t nbytes, off_t offset) | |||
| 87 | { | |||
| 88 | ssize_t rval; | |||
| 89 | ||||
| 90 | errno(*__errno()) = 0; | |||
| 91 | rval = pread(fd, buf, nbytes, offset); | |||
| 92 | if (rval == -1 || errno(*__errno()) != 0) { | |||
| 93 | _kvm_syserr(kd, kd->program, "pread"); | |||
| 94 | } | |||
| 95 | return (rval); | |||
| 96 | } | |||
| 97 | ||||
| 98 | /* | |||
| 99 | * Wrapper around pwrite. | |||
| 100 | */ | |||
| 101 | ssize_t | |||
| 102 | _kvm_pwrite(kvm_t *kd, int fd, const void *buf, size_t nbytes, off_t offset) | |||
| 103 | { | |||
| 104 | ssize_t rval; | |||
| 105 | ||||
| 106 | errno(*__errno()) = 0; | |||
| 107 | rval = pwrite(fd, buf, nbytes, offset); | |||
| 108 | if (rval == -1 || errno(*__errno()) != 0) { | |||
| 109 | _kvm_syserr(kd, kd->program, "pwrite"); | |||
| 110 | } | |||
| 111 | return (rval); | |||
| 112 | } | |||
| 113 | ||||
| 114 | /* | |||
| 115 | * Report an error using printf style arguments. "program" is kd->program | |||
| 116 | * on hard errors, and 0 on soft errors, so that under sun error emulation, | |||
| 117 | * only hard errors are printed out (otherwise, programs like gdb will | |||
| 118 | * generate tons of error messages when trying to access bogus pointers). | |||
| 119 | */ | |||
| 120 | void | |||
| 121 | _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...) | |||
| 122 | { | |||
| 123 | va_list ap; | |||
| 124 | ||||
| 125 | va_start(ap, fmt)__builtin_va_start((ap), fmt); | |||
| 126 | if (program != NULL((void *)0)) { | |||
| 127 | (void)fprintf(stderr(&__sF[2]), "%s: ", program); | |||
| 128 | (void)vfprintf(stderr(&__sF[2]), fmt, ap); | |||
| 129 | (void)fputc('\n', stderr(&__sF[2])); | |||
| 130 | } else | |||
| 131 | (void)vsnprintf(kd->errbuf, | |||
| 132 | sizeof(kd->errbuf), fmt, ap); | |||
| 133 | ||||
| 134 | va_end(ap)__builtin_va_end((ap)); | |||
| 135 | } | |||
| 136 | ||||
| 137 | void | |||
| 138 | _kvm_syserr(kvm_t *kd, const char *program, const char *fmt, ...) | |||
| 139 | { | |||
| 140 | va_list ap; | |||
| 141 | size_t n; | |||
| 142 | ||||
| 143 | va_start(ap, fmt)__builtin_va_start((ap), fmt); | |||
| 144 | if (program != NULL((void *)0)) { | |||
| 145 | (void)fprintf(stderr(&__sF[2]), "%s: ", program); | |||
| 146 | (void)vfprintf(stderr(&__sF[2]), fmt, ap); | |||
| 147 | (void)fprintf(stderr(&__sF[2]), ": %s\n", strerror(errno(*__errno()))); | |||
| 148 | } else { | |||
| 149 | char *cp = kd->errbuf; | |||
| 150 | ||||
| 151 | (void)vsnprintf(cp, sizeof(kd->errbuf), fmt, ap); | |||
| 152 | n = strlen(cp); | |||
| 153 | (void)snprintf(&cp[n], sizeof(kd->errbuf) - n, ": %s", | |||
| 154 | strerror(errno(*__errno()))); | |||
| 155 | } | |||
| 156 | va_end(ap)__builtin_va_end((ap)); | |||
| 157 | } | |||
| 158 | ||||
| 159 | void * | |||
| 160 | _kvm_malloc(kvm_t *kd, size_t n) | |||
| 161 | { | |||
| 162 | void *p; | |||
| 163 | ||||
| 164 | if ((p = malloc(n)) == NULL((void *)0)) | |||
| 165 | _kvm_err(kd, kd->program, "%s", strerror(errno(*__errno()))); | |||
| 166 | return (p); | |||
| 167 | } | |||
| 168 | ||||
| 169 | void * | |||
| 170 | _kvm_realloc(kvm_t *kd, void *p, size_t n) | |||
| 171 | { | |||
| 172 | if ((p = realloc(p, n)) == NULL((void *)0)) | |||
| 173 | _kvm_err(kd, kd->program, "%s", strerror(errno(*__errno()))); | |||
| 174 | return (p); | |||
| 175 | } | |||
| 176 | ||||
| 177 | static kvm_t * | |||
| 178 | _kvm_open(kvm_t *kd, const char *uf, const char *mf, const char *sf, | |||
| 179 | int flag, char *errout) | |||
| 180 | { | |||
| 181 | struct stat st; | |||
| 182 | ||||
| 183 | kd->db = 0; | |||
| 184 | kd->pmfd = -1; | |||
| 185 | kd->vmfd = -1; | |||
| 186 | kd->swfd = -1; | |||
| 187 | kd->nlfd = -1; | |||
| 188 | kd->alive = 0; | |||
| 189 | kd->filebase = NULL((void *)0); | |||
| 190 | kd->procbase = NULL((void *)0); | |||
| 191 | kd->nbpg = getpagesize(); | |||
| 192 | kd->swapspc = 0; | |||
| 193 | kd->argspc = 0; | |||
| 194 | kd->argbuf = 0; | |||
| 195 | kd->argv = 0; | |||
| 196 | kd->envspc = 0; | |||
| 197 | kd->envbuf = 0; | |||
| 198 | kd->envp = 0; | |||
| 199 | kd->vmst = NULL((void *)0); | |||
| 200 | kd->vm_page_buckets = 0; | |||
| 201 | kd->kcore_hdr = 0; | |||
| 202 | kd->cpu_dsize = 0; | |||
| 203 | kd->cpu_data = 0; | |||
| 204 | kd->dump_off = 0; | |||
| 205 | ||||
| 206 | if (flag & KVM_NO_FILES0x80000000) { | |||
| 207 | kd->alive = 1; | |||
| 208 | return (kd); | |||
| 209 | } | |||
| 210 | ||||
| 211 | if (uf && strlen(uf) >= PATH_MAX1024) { | |||
| 212 | _kvm_err(kd, kd->program, "exec file name too long"); | |||
| 213 | goto failed; | |||
| 214 | } | |||
| 215 | if (flag != O_RDONLY0x0000 && flag != O_WRONLY0x0001 && flag != O_RDWR0x0002) { | |||
| 216 | _kvm_err(kd, kd->program, "bad flags arg"); | |||
| 217 | goto failed; | |||
| 218 | } | |||
| 219 | flag |= O_CLOEXEC0x10000; | |||
| 220 | ||||
| 221 | if (mf == NULL((void *)0)) | |||
| 222 | mf = _PATH_MEM"/dev/mem"; | |||
| 223 | ||||
| 224 | if ((kd->pmfd = open(mf, flag)) == -1) { | |||
| 225 | _kvm_syserr(kd, kd->program, "%s", mf); | |||
| 226 | goto failed; | |||
| 227 | } | |||
| 228 | if (fstat(kd->pmfd, &st) == -1) { | |||
| 229 | _kvm_syserr(kd, kd->program, "%s", mf); | |||
| 230 | goto failed; | |||
| 231 | } | |||
| 232 | if (S_ISCHR(st.st_mode)((st.st_mode & 0170000) == 0020000)) { | |||
| 233 | /* | |||
| 234 | * If this is a character special device, then check that | |||
| 235 | * it's /dev/mem. If so, open kmem too. (Maybe we should | |||
| 236 | * make it work for either /dev/mem or /dev/kmem -- in either | |||
| 237 | * case you're working with a live kernel.) | |||
| 238 | */ | |||
| 239 | if (strcmp(mf, _PATH_MEM"/dev/mem") != 0) { /* XXX */ | |||
| 240 | _kvm_err(kd, kd->program, | |||
| 241 | "%s: not physical memory device", mf); | |||
| 242 | goto failed; | |||
| 243 | } | |||
| 244 | if ((kd->vmfd = open(_PATH_KMEM"/dev/kmem", flag)) == -1) { | |||
| 245 | _kvm_syserr(kd, kd->program, "%s", _PATH_KMEM"/dev/kmem"); | |||
| 246 | goto failed; | |||
| 247 | } | |||
| 248 | kd->alive = 1; | |||
| 249 | if (sf != NULL((void *)0) && (kd->swfd = open(sf, flag)) == -1) { | |||
| 250 | _kvm_syserr(kd, kd->program, "%s", sf); | |||
| 251 | goto failed; | |||
| 252 | } | |||
| 253 | /* | |||
| 254 | * Open kvm nlist database. We only try to use | |||
| 255 | * the pre-built database if the namelist file name | |||
| 256 | * pointer is NULL. If the database cannot or should | |||
| 257 | * not be opened, open the namelist argument so we | |||
| 258 | * revert to slow nlist() calls. | |||
| 259 | * If no file is specified, try opening _PATH_KSYMS and | |||
| 260 | * fall back to _PATH_UNIX. | |||
| 261 | */ | |||
| 262 | if (kvm_dbopen(kd, uf ? uf : _PATH_UNIX"/bsd") == -1 && | |||
| 263 | kvm_opennamelist(kd, uf)) | |||
| 264 | goto failed; | |||
| 265 | } else { | |||
| 266 | /* | |||
| 267 | * This is a crash dump. | |||
| 268 | * Initialize the virtual address translation machinery, | |||
| 269 | * but first setup the namelist fd. | |||
| 270 | * If no file is specified, try opening _PATH_KSYMS and | |||
| 271 | * fall back to _PATH_UNIX. | |||
| 272 | */ | |||
| 273 | if (kvm_opennamelist(kd, uf)) | |||
| 274 | goto failed; | |||
| 275 | ||||
| 276 | /* | |||
| 277 | * If there is no valid core header, fail silently here. | |||
| 278 | * The address translations however will fail without | |||
| 279 | * header. Things can be made to run by calling | |||
| 280 | * kvm_dump_mkheader() before doing any translation. | |||
| 281 | */ | |||
| 282 | if (_kvm_get_header(kd) == 0) { | |||
| 283 | if (_kvm_initvtop(kd) < 0) | |||
| 284 | goto failed; | |||
| 285 | } | |||
| 286 | } | |||
| 287 | return (kd); | |||
| 288 | failed: | |||
| 289 | /* | |||
| 290 | * Copy out the error if doing sane error semantics. | |||
| 291 | */ | |||
| 292 | if (errout != 0) | |||
| 293 | (void)strlcpy(errout, kd->errbuf, _POSIX2_LINE_MAX2048); | |||
| 294 | (void)kvm_close(kd); | |||
| 295 | return (0); | |||
| 296 | } | |||
| 297 | ||||
| 298 | static int | |||
| 299 | kvm_opennamelist(kvm_t *kd, const char *uf) | |||
| 300 | { | |||
| 301 | int fd; | |||
| 302 | ||||
| 303 | if (uf != NULL((void *)0)) | |||
| 304 | fd = open(uf, O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
| 305 | else { | |||
| 306 | fd = open(_PATH_KSYMS"/dev/ksyms", O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
| 307 | uf = _PATH_UNIX"/bsd"; | |||
| 308 | if (fd == -1) | |||
| 309 | fd = open(uf, O_RDONLY0x0000 | O_CLOEXEC0x10000); | |||
| 310 | } | |||
| 311 | if (fd == -1) { | |||
| 312 | _kvm_syserr(kd, kd->program, "%s", uf); | |||
| 313 | return (-1); | |||
| 314 | } | |||
| 315 | ||||
| 316 | kd->nlfd = fd; | |||
| 317 | return (0); | |||
| 318 | } | |||
| 319 | ||||
| 320 | /* | |||
| 321 | * The kernel dump file (from savecore) contains: | |||
| 322 | * kcore_hdr_t kcore_hdr; | |||
| 323 | * kcore_seg_t cpu_hdr; | |||
| 324 | * (opaque) cpu_data; (size is cpu_hdr.c_size) | |||
| 325 | * kcore_seg_t mem_hdr; | |||
| 326 | * (memory) mem_data; (size is mem_hdr.c_size) | |||
| 327 | * | |||
| 328 | * Note: khdr is padded to khdr.c_hdrsize; | |||
| 329 | * cpu_hdr and mem_hdr are padded to khdr.c_seghdrsize | |||
| 330 | */ | |||
| 331 | static int | |||
| 332 | _kvm_get_header(kvm_t *kd) | |||
| 333 | { | |||
| 334 | kcore_hdr_t kcore_hdr; | |||
| 335 | kcore_seg_t cpu_hdr; | |||
| 336 | kcore_seg_t mem_hdr; | |||
| 337 | size_t offset; | |||
| 338 | ssize_t sz; | |||
| 339 | ||||
| 340 | /* | |||
| 341 | * Read the kcore_hdr_t | |||
| 342 | */ | |||
| 343 | sz = _kvm_pread(kd, kd->pmfd, &kcore_hdr, sizeof(kcore_hdr), (off_t)0); | |||
| 344 | if (sz != sizeof(kcore_hdr)) { | |||
| 345 | return (-1); | |||
| 346 | } | |||
| 347 | ||||
| 348 | /* | |||
| 349 | * Currently, we only support dump-files made by the current | |||
| 350 | * architecture... | |||
| 351 | */ | |||
| 352 | 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) || | |||
| 353 | (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)) | |||
| 354 | return (-1); | |||
| 355 | ||||
| 356 | /* | |||
| 357 | * Currently, we only support exactly 2 segments: cpu-segment | |||
| 358 | * and data-segment in exactly that order. | |||
| 359 | */ | |||
| 360 | if (kcore_hdr.c_nseg != 2) | |||
| 361 | return (-1); | |||
| 362 | ||||
| 363 | /* | |||
| 364 | * Save away the kcore_hdr. All errors after this | |||
| 365 | * should do a to "goto fail" to deallocate things. | |||
| 366 | */ | |||
| 367 | kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr)); | |||
| 368 | if (kd->kcore_hdr == NULL((void *)0)) | |||
| 369 | goto fail; | |||
| 370 | memcpy(kd->kcore_hdr, &kcore_hdr, sizeof(kcore_hdr)); | |||
| 371 | offset = kcore_hdr.c_hdrsize; | |||
| 372 | ||||
| 373 | /* | |||
| 374 | * Read the CPU segment header | |||
| 375 | */ | |||
| 376 | sz = _kvm_pread(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr), (off_t)offset); | |||
| 377 | if (sz != sizeof(cpu_hdr)) { | |||
| 378 | goto fail; | |||
| 379 | } | |||
| 380 | ||||
| 381 | 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) || | |||
| 382 | (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)) | |||
| 383 | goto fail; | |||
| 384 | offset += kcore_hdr.c_seghdrsize; | |||
| 385 | ||||
| 386 | /* | |||
| 387 | * Read the CPU segment DATA. | |||
| 388 | */ | |||
| 389 | kd->cpu_dsize = cpu_hdr.c_size; | |||
| 390 | kd->cpu_data = _kvm_malloc(kd, (size_t)cpu_hdr.c_size); | |||
| 391 | if (kd->cpu_data == NULL((void *)0)) | |||
| 392 | goto fail; | |||
| 393 | ||||
| 394 | sz = _kvm_pread(kd, kd->pmfd, kd->cpu_data, (size_t)cpu_hdr.c_size, | |||
| 395 | (off_t)offset); | |||
| 396 | if (sz != (size_t)cpu_hdr.c_size) { | |||
| 397 | goto fail; | |||
| 398 | } | |||
| 399 | ||||
| 400 | offset += cpu_hdr.c_size; | |||
| 401 | ||||
| 402 | /* | |||
| 403 | * Read the next segment header: data segment | |||
| 404 | */ | |||
| 405 | sz = _kvm_pread(kd, kd->pmfd, &mem_hdr, sizeof(mem_hdr), (off_t)offset); | |||
| 406 | if (sz != sizeof(mem_hdr)) { | |||
| 407 | goto fail; | |||
| 408 | } | |||
| 409 | ||||
| 410 | offset += kcore_hdr.c_seghdrsize; | |||
| 411 | ||||
| 412 | 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) || | |||
| 413 | (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)) | |||
| 414 | goto fail; | |||
| 415 | ||||
| 416 | kd->dump_off = offset; | |||
| 417 | return (0); | |||
| 418 | ||||
| 419 | fail: | |||
| 420 | free(kd->kcore_hdr); | |||
| 421 | kd->kcore_hdr = NULL((void *)0); | |||
| 422 | if (kd->cpu_data != NULL((void *)0)) { | |||
| 423 | free(kd->cpu_data); | |||
| 424 | kd->cpu_data = NULL((void *)0); | |||
| 425 | kd->cpu_dsize = 0; | |||
| 426 | } | |||
| 427 | ||||
| 428 | return (-1); | |||
| 429 | } | |||
| 430 | ||||
| 431 | /* | |||
| 432 | * The format while on the dump device is: (new format) | |||
| 433 | * kcore_seg_t cpu_hdr; | |||
| 434 | * (opaque) cpu_data; (size is cpu_hdr.c_size) | |||
| 435 | * kcore_seg_t mem_hdr; | |||
| 436 | * (memory) mem_data; (size is mem_hdr.c_size) | |||
| 437 | */ | |||
| 438 | int | |||
| 439 | kvm_dump_mkheader(kvm_t *kd, off_t dump_off) | |||
| 440 | { | |||
| 441 | kcore_seg_t cpu_hdr; | |||
| 442 | int hdr_size; | |||
| 443 | ssize_t sz; | |||
| 444 | ||||
| 445 | if (kd->kcore_hdr != NULL((void *)0)) { | |||
| 446 | _kvm_err(kd, kd->program, "already has a dump header"); | |||
| 447 | return (-1); | |||
| 448 | } | |||
| 449 | if (ISALIVE(kd)((kd)->alive)) { | |||
| 450 | _kvm_err(kd, kd->program, "don't use on live kernel"); | |||
| 451 | return (-1); | |||
| 452 | } | |||
| 453 | ||||
| 454 | /* | |||
| 455 | * Validate new format crash dump | |||
| 456 | */ | |||
| 457 | sz = _kvm_pread(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr), (off_t)dump_off); | |||
| 458 | if (sz != sizeof(cpu_hdr)) { | |||
| 459 | return (-1); | |||
| 460 | } | |||
| 461 | 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) | |||
| 462 | || (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)) { | |||
| 463 | _kvm_err(kd, 0, "invalid magic in cpu_hdr"); | |||
| 464 | return (-1); | |||
| 465 | } | |||
| 466 | hdr_size = _ALIGN(sizeof(cpu_hdr))(((unsigned long)(sizeof(cpu_hdr)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
| 467 | ||||
| 468 | /* | |||
| 469 | * Read the CPU segment. | |||
| 470 | */ | |||
| 471 | kd->cpu_dsize = cpu_hdr.c_size; | |||
| 472 | kd->cpu_data = _kvm_malloc(kd, kd->cpu_dsize); | |||
| 473 | if (kd->cpu_data == NULL((void *)0)) | |||
| 474 | goto fail; | |||
| 475 | ||||
| 476 | sz = _kvm_pread(kd, kd->pmfd, kd->cpu_data, (size_t)cpu_hdr.c_size, | |||
| 477 | (off_t)dump_off+hdr_size); | |||
| 478 | if (sz != (ssize_t)cpu_hdr.c_size) { | |||
| 479 | _kvm_err(kd, 0, "invalid size in cpu_hdr"); | |||
| 480 | goto fail; | |||
| 481 | } | |||
| 482 | hdr_size += kd->cpu_dsize; | |||
| 483 | ||||
| 484 | /* | |||
| 485 | * Leave phys mem pointer at beginning of memory data | |||
| 486 | */ | |||
| 487 | kd->dump_off = dump_off + hdr_size; | |||
| 488 | errno(*__errno()) = 0; | |||
| 489 | if (lseek(kd->pmfd, kd->dump_off, SEEK_SET0) != kd->dump_off && errno(*__errno()) != 0) { | |||
| 490 | _kvm_err(kd, 0, "invalid dump offset - lseek"); | |||
| 491 | goto fail; | |||
| 492 | } | |||
| 493 | ||||
| 494 | /* | |||
| 495 | * Create a kcore_hdr. | |||
| 496 | */ | |||
| 497 | kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr_t)); | |||
| 498 | if (kd->kcore_hdr == NULL((void *)0)) | |||
| 499 | goto fail; | |||
| 500 | ||||
| 501 | kd->kcore_hdr->c_hdrsize = _ALIGN(sizeof(kcore_hdr_t))(((unsigned long)(sizeof(kcore_hdr_t)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
| 502 | kd->kcore_hdr->c_seghdrsize = _ALIGN(sizeof(kcore_seg_t))(((unsigned long)(sizeof(kcore_seg_t)) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
| 503 | kd->kcore_hdr->c_nseg = 2; | |||
| 504 | 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) ))) ); | |||
| 505 | ||||
| 506 | /* | |||
| 507 | * Now that we have a valid header, enable translations. | |||
| 508 | */ | |||
| 509 | if (_kvm_initvtop(kd) == 0) | |||
| 510 | /* Success */ | |||
| 511 | return (hdr_size); | |||
| 512 | ||||
| 513 | fail: | |||
| 514 | free(kd->kcore_hdr); | |||
| 515 | kd->kcore_hdr = NULL((void *)0); | |||
| 516 | if (kd->cpu_data != NULL((void *)0)) { | |||
| 517 | free(kd->cpu_data); | |||
| 518 | kd->cpu_data = NULL((void *)0); | |||
| 519 | kd->cpu_dsize = 0; | |||
| 520 | } | |||
| 521 | return (-1); | |||
| 522 | } | |||
| 523 | ||||
| 524 | static int | |||
| 525 | clear_gap(kvm_t *kd, FILE *fp, int size) | |||
| 526 | { | |||
| 527 | if (size <= 0) /* XXX - < 0 should never happen */ | |||
| 528 | return (0); | |||
| 529 | while (size-- > 0) { | |||
| 530 | if (fputc(0, fp) == EOF(-1)) { | |||
| 531 | _kvm_syserr(kd, kd->program, "clear_gap"); | |||
| 532 | return (-1); | |||
| 533 | } | |||
| 534 | } | |||
| 535 | return (0); | |||
| 536 | } | |||
| 537 | ||||
| 538 | /* | |||
| 539 | * Write the dump header info to 'fp'. Note that we can't use fseek(3) here | |||
| 540 | * because 'fp' might be a file pointer obtained by zopen(). | |||
| 541 | */ | |||
| 542 | int | |||
| 543 | kvm_dump_wrtheader(kvm_t *kd, FILE *fp, int dumpsize) | |||
| 544 | { | |||
| 545 | kcore_seg_t seghdr; | |||
| 546 | long offset; | |||
| 547 | int gap; | |||
| 548 | ||||
| 549 | if (kd->kcore_hdr == NULL((void *)0) || kd->cpu_data == NULL((void *)0)) { | |||
| 550 | _kvm_err(kd, kd->program, "no valid dump header(s)"); | |||
| 551 | return (-1); | |||
| 552 | } | |||
| 553 | ||||
| 554 | /* | |||
| 555 | * Write the generic header | |||
| 556 | */ | |||
| 557 | offset = 0; | |||
| 558 | if (fwrite(kd->kcore_hdr, sizeof(kcore_hdr_t), 1, fp) < 1) { | |||
| 559 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
| 560 | return (-1); | |||
| 561 | } | |||
| 562 | offset += kd->kcore_hdr->c_hdrsize; | |||
| 563 | gap = kd->kcore_hdr->c_hdrsize - sizeof(kcore_hdr_t); | |||
| 564 | if (clear_gap(kd, fp, gap) == -1) | |||
| 565 | return (-1); | |||
| 566 | ||||
| 567 | /* | |||
| 568 | * Write the cpu header | |||
| 569 | */ | |||
| 570 | 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) ))) ); | |||
| 571 | seghdr.c_size = (u_long)_ALIGN(kd->cpu_dsize)(((unsigned long)(kd->cpu_dsize) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)); | |||
| 572 | if (fwrite(&seghdr, sizeof(seghdr), 1, fp) < 1) { | |||
| 573 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
| 574 | return (-1); | |||
| 575 | } | |||
| 576 | offset += kd->kcore_hdr->c_seghdrsize; | |||
| 577 | gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr); | |||
| 578 | if (clear_gap(kd, fp, gap) == -1) | |||
| 579 | return (-1); | |||
| 580 | ||||
| 581 | if (fwrite(kd->cpu_data, kd->cpu_dsize, 1, fp) < 1) { | |||
| 582 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
| 583 | return (-1); | |||
| 584 | } | |||
| 585 | offset += seghdr.c_size; | |||
| 586 | gap = seghdr.c_size - kd->cpu_dsize; | |||
| 587 | if (clear_gap(kd, fp, gap) == -1) | |||
| 588 | return (-1); | |||
| 589 | ||||
| 590 | /* | |||
| 591 | * Write the actual dump data segment header | |||
| 592 | */ | |||
| 593 | 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) ))) ); | |||
| 594 | seghdr.c_size = dumpsize; | |||
| 595 | if (fwrite(&seghdr, sizeof(seghdr), 1, fp) < 1) { | |||
| 596 | _kvm_syserr(kd, kd->program, "kvm_dump_wrtheader"); | |||
| 597 | return (-1); | |||
| 598 | } | |||
| 599 | offset += kd->kcore_hdr->c_seghdrsize; | |||
| 600 | gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr); | |||
| 601 | if (clear_gap(kd, fp, gap) == -1) | |||
| 602 | return (-1); | |||
| 603 | ||||
| 604 | return (offset); | |||
| 605 | } | |||
| 606 | ||||
| 607 | kvm_t * | |||
| 608 | kvm_openfiles(const char *uf, const char *mf, const char *sf, | |||
| 609 | int flag, char *errout) | |||
| 610 | { | |||
| 611 | kvm_t *kd; | |||
| 612 | ||||
| 613 | if ((kd = malloc(sizeof(*kd))) == NULL((void *)0)) { | |||
| 614 | (void)strlcpy(errout, strerror(errno(*__errno())), _POSIX2_LINE_MAX2048); | |||
| 615 | return (0); | |||
| 616 | } | |||
| 617 | kd->program = 0; | |||
| 618 | return (_kvm_open(kd, uf, mf, sf, flag, errout)); | |||
| 619 | } | |||
| 620 | ||||
| 621 | kvm_t * | |||
| 622 | kvm_open(const char *uf, const char *mf, const char *sf, int flag, | |||
| 623 | const char *program) | |||
| 624 | { | |||
| 625 | kvm_t *kd; | |||
| 626 | ||||
| 627 | if ((kd = malloc(sizeof(*kd))) == NULL((void *)0) && program != NULL((void *)0)) { | |||
| ||||
| 628 | (void)fprintf(stderr(&__sF[2]), "%s: %s\n", program, strerror(errno(*__errno()))); | |||
| 629 | return (0); | |||
| 630 | } | |||
| 631 | kd->program = program; | |||
| ||||
| 632 | return (_kvm_open(kd, uf, mf, sf, flag, NULL((void *)0))); | |||
| 633 | } | |||
| 634 | ||||
| 635 | int | |||
| 636 | kvm_close(kvm_t *kd) | |||
| 637 | { | |||
| 638 | int error = 0; | |||
| 639 | ||||
| 640 | if (kd->pmfd >= 0) | |||
| 641 | error |= close(kd->pmfd); | |||
| 642 | if (kd->vmfd >= 0) | |||
| 643 | error |= close(kd->vmfd); | |||
| 644 | kd->alive = 0; | |||
| 645 | if (kd->nlfd >= 0) | |||
| 646 | error |= close(kd->nlfd); | |||
| 647 | if (kd->swfd >= 0) | |||
| 648 | error |= close(kd->swfd); | |||
| 649 | if (kd->db != 0) | |||
| 650 | error |= (kd->db->close)(kd->db); | |||
| 651 | if (kd->vmst) | |||
| 652 | _kvm_freevtop(kd); | |||
| 653 | kd->cpu_dsize = 0; | |||
| 654 | free(kd->cpu_data); | |||
| 655 | free(kd->kcore_hdr); | |||
| 656 | free(kd->filebase); | |||
| 657 | free(kd->procbase); | |||
| 658 | free(kd->swapspc); | |||
| 659 | free(kd->argspc); | |||
| 660 | free(kd->argbuf); | |||
| 661 | free(kd->argv); | |||
| 662 | free(kd->envspc); | |||
| 663 | free(kd->envbuf); | |||
| 664 | free(kd->envp); | |||
| 665 | free(kd); | |||
| 666 | ||||
| 667 | return (error); | |||
| 668 | } | |||
| 669 | DEF(kvm_close)__asm__(".global " "kvm_close" " ; " "kvm_close" " = " "__kvm_close" ); | |||
| 670 | ||||
| 671 | /* | |||
| 672 | * Set up state necessary to do queries on the kernel namelist | |||
| 673 | * data base. If the data base is out-of-data/incompatible with | |||
| 674 | * given executable, set up things so we revert to standard nlist call. | |||
| 675 | * Only called for live kernels. Return 0 on success, -1 on failure. | |||
| 676 | */ | |||
| 677 | static int | |||
| 678 | kvm_dbopen(kvm_t *kd, const char *uf) | |||
| 679 | { | |||
| 680 | char dbversion[_POSIX2_LINE_MAX2048], kversion[_POSIX2_LINE_MAX2048]; | |||
| 681 | char dbname[PATH_MAX1024], ufbuf[PATH_MAX1024]; | |||
| 682 | struct nlist nitem; | |||
| 683 | size_t dbversionlen; | |||
| 684 | DBT rec; | |||
| 685 | ||||
| 686 | strlcpy(ufbuf, uf, sizeof(ufbuf)); | |||
| 687 | uf = basename(ufbuf); | |||
| 688 | ||||
| 689 | (void)snprintf(dbname, sizeof(dbname), "%skvm_%s.db", _PATH_VARDB"/var/db/", uf); | |||
| 690 | kd->db = dbopen(dbname, O_RDONLY0x0000, 0, DB_HASH, NULL((void *)0)); | |||
| 691 | if (kd->db == NULL((void *)0)) { | |||
| 692 | switch (errno(*__errno())) { | |||
| 693 | case ENOENT2: | |||
| 694 | /* No kvm_bsd.db, fall back to /bsd silently */ | |||
| 695 | break; | |||
| 696 | case EFTYPE79: | |||
| 697 | _kvm_err(kd, kd->program, | |||
| 698 | "file %s is incorrectly formatted", dbname); | |||
| 699 | break; | |||
| 700 | case EINVAL22: | |||
| 701 | _kvm_err(kd, kd->program, | |||
| 702 | "invalid argument to dbopen()"); | |||
| 703 | break; | |||
| 704 | default: | |||
| 705 | _kvm_err(kd, kd->program, "unknown dbopen() error"); | |||
| 706 | break; | |||
| 707 | } | |||
| 708 | return (-1); | |||
| 709 | } | |||
| 710 | ||||
| 711 | /* | |||
| 712 | * read version out of database | |||
| 713 | */ | |||
| 714 | rec.data = VRS_KEY"VERSION"; | |||
| 715 | rec.size = sizeof(VRS_KEY"VERSION") - 1; | |||
| 716 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
| 717 | goto close; | |||
| 718 | if (rec.data == 0 || rec.size > sizeof(dbversion)) | |||
| 719 | goto close; | |||
| 720 | ||||
| 721 | bcopy(rec.data, dbversion, rec.size); | |||
| 722 | dbversionlen = rec.size; | |||
| 723 | ||||
| 724 | /* | |||
| 725 | * Read version string from kernel memory. | |||
| 726 | * Since we are dealing with a live kernel, we can call kvm_read() | |||
| 727 | * at this point. | |||
| 728 | */ | |||
| 729 | rec.data = VRS_SYM"_version"; | |||
| 730 | rec.size = sizeof(VRS_SYM"_version") - 1; | |||
| 731 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
| 732 | goto close; | |||
| 733 | if (rec.data == 0 || rec.size != sizeof(struct nlist)) | |||
| 734 | goto close; | |||
| 735 | bcopy(rec.data, &nitem, sizeof(nitem)); | |||
| 736 | if (kvm_read(kd, (u_long)nitem.n_value, kversion, dbversionlen) != | |||
| 737 | dbversionlen) | |||
| 738 | goto close; | |||
| 739 | /* | |||
| 740 | * If they match, we win - otherwise clear out kd->db so | |||
| 741 | * we revert to slow nlist(). | |||
| 742 | */ | |||
| 743 | if (bcmp(dbversion, kversion, dbversionlen) == 0) | |||
| 744 | return (0); | |||
| 745 | close: | |||
| 746 | (void)(kd->db->close)(kd->db); | |||
| 747 | kd->db = 0; | |||
| 748 | ||||
| 749 | return (-1); | |||
| 750 | } | |||
| 751 | ||||
| 752 | int | |||
| 753 | kvm_nlist(kvm_t *kd, struct nlist *nl) | |||
| 754 | { | |||
| 755 | struct nlist *p; | |||
| 756 | int nvalid, rv; | |||
| 757 | ||||
| 758 | /* | |||
| 759 | * If we can't use the data base, revert to the | |||
| 760 | * slow library call. | |||
| 761 | */ | |||
| 762 | if (kd->db == 0) { | |||
| 763 | rv = __fdnlist(kd->nlfd, nl); | |||
| 764 | if (rv == -1) | |||
| 765 | _kvm_err(kd, 0, "bad namelist"); | |||
| 766 | return (rv); | |||
| 767 | } | |||
| 768 | ||||
| 769 | /* | |||
| 770 | * We can use the kvm data base. Go through each nlist entry | |||
| 771 | * and look it up with a db query. | |||
| 772 | */ | |||
| 773 | nvalid = 0; | |||
| 774 | for (p = nl; p->n_name && p->n_name[0]; ++p) { | |||
| 775 | size_t len; | |||
| 776 | DBT rec; | |||
| 777 | ||||
| 778 | if ((len = strlen(p->n_name)) > 4096) { | |||
| 779 | /* sanity */ | |||
| 780 | _kvm_err(kd, kd->program, "symbol too large"); | |||
| 781 | return (-1); | |||
| 782 | } | |||
| 783 | rec.data = p->n_name; | |||
| 784 | rec.size = len; | |||
| 785 | ||||
| 786 | /* | |||
| 787 | * Make sure that n_value = 0 when the symbol isn't found | |||
| 788 | */ | |||
| 789 | p->n_value = 0; | |||
| 790 | ||||
| 791 | if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0)) | |||
| 792 | continue; | |||
| 793 | if (rec.data == 0 || rec.size != sizeof(struct nlist)) | |||
| 794 | continue; | |||
| 795 | ++nvalid; | |||
| 796 | /* | |||
| 797 | * Avoid alignment issues. | |||
| 798 | */ | |||
| 799 | bcopy((char *)rec.data + offsetof(struct nlist, n_type)__builtin_offsetof(struct nlist, n_type), | |||
| 800 | &p->n_type, sizeof(p->n_type)); | |||
| 801 | bcopy((char *)rec.data + offsetof(struct nlist, n_value)__builtin_offsetof(struct nlist, n_value), | |||
| 802 | &p->n_value, sizeof(p->n_value)); | |||
| 803 | } | |||
| 804 | /* | |||
| 805 | * Return the number of entries that weren't found. | |||
| 806 | */ | |||
| 807 | return ((p - nl) - nvalid); | |||
| 808 | } | |||
| 809 | DEF(kvm_nlist)__asm__(".global " "kvm_nlist" " ; " "kvm_nlist" " = " "__kvm_nlist" ); | |||
| 810 | ||||
| 811 | int | |||
| 812 | kvm_dump_inval(kvm_t *kd) | |||
| 813 | { | |||
| 814 | struct nlist nl[2]; | |||
| 815 | u_long x; | |||
| 816 | paddr_t pa; | |||
| 817 | ||||
| 818 | if (ISALIVE(kd)((kd)->alive)) { | |||
| 819 | _kvm_err(kd, kd->program, "clearing dump on live kernel"); | |||
| 820 | return (-1); | |||
| 821 | } | |||
| 822 | nl[0].n_name = "_dumpmag"; | |||
| 823 | nl[1].n_name = NULL((void *)0); | |||
| 824 | ||||
| 825 | if (kvm_nlist(kd, nl) == -1) { | |||
| 826 | _kvm_err(kd, 0, "bad namelist"); | |||
| 827 | return (-1); | |||
| 828 | } | |||
| 829 | ||||
| 830 | if (nl[0].n_value == 0) { | |||
| 831 | _kvm_err(kd, nl[0].n_name, "not in name list"); | |||
| 832 | return (-1); | |||
| 833 | } | |||
| 834 | ||||
| 835 | if (_kvm_kvatop(kd, (u_long)nl[0].n_value, &pa) == 0) | |||
| 836 | return (-1); | |||
| 837 | ||||
| 838 | x = 0; | |||
| 839 | if (_kvm_pwrite(kd, kd->pmfd, &x, sizeof(x), | |||
| 840 | (off_t)_kvm_pa2off(kd, pa)) != sizeof(x)) { | |||
| 841 | _kvm_err(kd, 0, "cannot invalidate dump"); | |||
| 842 | return (-1); | |||
| 843 | } | |||
| 844 | return (0); | |||
| 845 | } | |||
| 846 | ||||
| 847 | ssize_t | |||
| 848 | kvm_read(kvm_t *kd, u_long kva, void *buf, size_t len) | |||
| 849 | { | |||
| 850 | ssize_t cc; | |||
| 851 | void *cp; | |||
| 852 | ||||
| 853 | if (ISALIVE(kd)((kd)->alive)) { | |||
| 854 | /* | |||
| 855 | * We're using /dev/kmem. Just read straight from the | |||
| 856 | * device and let the active kernel do the address translation. | |||
| 857 | */ | |||
| 858 | cc = _kvm_pread(kd, kd->vmfd, buf, len, (off_t)kva); | |||
| 859 | if (cc == -1) { | |||
| 860 | _kvm_err(kd, 0, "invalid address (%lx)", kva); | |||
| 861 | return (-1); | |||
| 862 | } else if (cc < len) | |||
| 863 | _kvm_err(kd, kd->program, "short read"); | |||
| 864 | return (cc); | |||
| 865 | } else { | |||
| 866 | if ((kd->kcore_hdr == NULL((void *)0)) || (kd->cpu_data == NULL((void *)0))) { | |||
| 867 | _kvm_err(kd, kd->program, "no valid dump header"); | |||
| 868 | return (-1); | |||
| 869 | } | |||
| 870 | cp = buf; | |||
| 871 | while (len > 0) { | |||
| 872 | paddr_t pa; | |||
| 873 | ||||
| 874 | /* In case of error, _kvm_kvatop sets the err string */ | |||
| 875 | cc = _kvm_kvatop(kd, kva, &pa); | |||
| 876 | if (cc == 0) | |||
| 877 | return (-1); | |||
| 878 | if (cc > len) | |||
| 879 | cc = len; | |||
| 880 | cc = _kvm_pread(kd, kd->pmfd, cp, (size_t)cc, | |||
| 881 | (off_t)_kvm_pa2off(kd, pa)); | |||
| 882 | if (cc == -1) { | |||
| 883 | _kvm_syserr(kd, 0, _PATH_MEM"/dev/mem"); | |||
| 884 | break; | |||
| 885 | } | |||
| 886 | /* | |||
| 887 | * If kvm_kvatop returns a bogus value or our core | |||
| 888 | * file is truncated, we might wind up seeking beyond | |||
| 889 | * the end of the core file in which case the read will | |||
| 890 | * return 0 (EOF). | |||
| 891 | */ | |||
| 892 | if (cc == 0) | |||
| 893 | break; | |||
| 894 | cp = (char *)cp + cc; | |||
| 895 | kva += cc; | |||
| 896 | len -= cc; | |||
| 897 | } | |||
| 898 | return ((char *)cp - (char *)buf); | |||
| 899 | } | |||
| 900 | /* NOTREACHED */ | |||
| 901 | } | |||
| 902 | DEF(kvm_read)__asm__(".global " "kvm_read" " ; " "kvm_read" " = " "__kvm_read" ); | |||
| 903 | ||||
| 904 | ssize_t | |||
| 905 | kvm_write(kvm_t *kd, u_long kva, const void *buf, size_t len) | |||
| 906 | { | |||
| 907 | int cc; | |||
| 908 | ||||
| 909 | if (ISALIVE(kd)((kd)->alive)) { | |||
| 910 | /* | |||
| 911 | * Just like kvm_read, only we write. | |||
| 912 | */ | |||
| 913 | cc = _kvm_pwrite(kd, kd->vmfd, buf, len, (off_t)kva); | |||
| 914 | if (cc == -1) { | |||
| 915 | _kvm_err(kd, 0, "invalid address (%lx)", kva); | |||
| 916 | return (-1); | |||
| 917 | } else if (cc < len) | |||
| 918 | _kvm_err(kd, kd->program, "short write"); | |||
| 919 | return (cc); | |||
| 920 | } else { | |||
| 921 | _kvm_err(kd, kd->program, | |||
| 922 | "kvm_write not implemented for dead kernels"); | |||
| 923 | return (-1); | |||
| 924 | } | |||
| 925 | /* NOTREACHED */ | |||
| 926 | } |