diff --git a/lib/libkvm/kvm.c b/lib/libkvm/kvm.c index 2f35f26df1ca..2a148399a211 100644 --- a/lib/libkvm/kvm.c +++ b/lib/libkvm/kvm.c @@ -1,501 +1,508 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1989, 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software developed by the Computer Systems * Engineering group at Lawrence Berkeley Laboratory under DARPA contract * BG 91-66 and contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); __SCCSID("@(#)kvm.c 8.2 (Berkeley) 2/13/94"); #include #include #define _WANT_VNET #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "kvm_private.h" SET_DECLARE(kvm_arch, struct kvm_arch); static char _kd_is_null[] = ""; char * kvm_geterr(kvm_t *kd) { if (kd == NULL) return (_kd_is_null); return (kd->errbuf); } static int _kvm_read_kernel_ehdr(kvm_t *kd) { Elf *elf; if (elf_version(EV_CURRENT) == EV_NONE) { _kvm_err(kd, kd->program, "Unsupported libelf"); return (-1); } elf = elf_begin(kd->nlfd, ELF_C_READ, NULL); if (elf == NULL) { _kvm_err(kd, kd->program, "%s", elf_errmsg(0)); return (-1); } if (elf_kind(elf) != ELF_K_ELF) { _kvm_err(kd, kd->program, "kernel is not an ELF file"); return (-1); } if (gelf_getehdr(elf, &kd->nlehdr) == NULL) { _kvm_err(kd, kd->program, "%s", elf_errmsg(0)); elf_end(elf); return (-1); } elf_end(elf); switch (kd->nlehdr.e_ident[EI_DATA]) { case ELFDATA2LSB: case ELFDATA2MSB: return (0); default: _kvm_err(kd, kd->program, "unsupported ELF data encoding for kernel"); return (-1); } } static kvm_t * _kvm_open(kvm_t *kd, const char *uf, const char *mf, int flag, char *errout) { struct kvm_arch **parch; struct stat st; kd->vmfd = -1; kd->pmfd = -1; kd->nlfd = -1; kd->vmst = NULL; kd->procbase = NULL; kd->argspc = NULL; kd->argv = NULL; if (uf == NULL) uf = getbootfile(); else if (strlen(uf) >= MAXPATHLEN) { _kvm_err(kd, kd->program, "exec file name too long"); goto failed; } if (flag & ~O_RDWR) { _kvm_err(kd, kd->program, "bad flags arg"); goto failed; } if (mf == NULL) mf = _PATH_MEM; if ((kd->pmfd = open(mf, flag | O_CLOEXEC, 0)) < 0) { _kvm_syserr(kd, kd->program, "%s", mf); goto failed; } if (fstat(kd->pmfd, &st) < 0) { _kvm_syserr(kd, kd->program, "%s", mf); goto failed; } if (S_ISREG(st.st_mode) && st.st_size <= 0) { errno = EINVAL; _kvm_syserr(kd, kd->program, "empty file"); goto failed; } if (S_ISCHR(st.st_mode)) { /* * If this is a character special device, then check that * it's /dev/mem. If so, open kmem too. (Maybe we should * make it work for either /dev/mem or /dev/kmem -- in either * case you're working with a live kernel.) */ if (strcmp(mf, _PATH_DEVNULL) == 0) { kd->vmfd = open(_PATH_DEVNULL, O_RDONLY | O_CLOEXEC); return (kd); } else if (strcmp(mf, _PATH_MEM) == 0) { if ((kd->vmfd = open(_PATH_KMEM, flag | O_CLOEXEC)) < 0) { _kvm_syserr(kd, kd->program, "%s", _PATH_KMEM); goto failed; } return (kd); } } /* * This is either a crash dump or a remote live system with its physical * memory fully accessible via a special device. * Open the namelist fd and determine the architecture. */ if ((kd->nlfd = open(uf, O_RDONLY | O_CLOEXEC, 0)) < 0) { _kvm_syserr(kd, kd->program, "%s", uf); goto failed; } if (_kvm_read_kernel_ehdr(kd) < 0) goto failed; if (strncmp(mf, _PATH_FWMEM, strlen(_PATH_FWMEM)) == 0 || strncmp(mf, _PATH_DEVVMM, strlen(_PATH_DEVVMM)) == 0) { kd->rawdump = 1; kd->writable = 1; } SET_FOREACH(parch, kvm_arch) { if ((*parch)->ka_probe(kd)) { kd->arch = *parch; break; } } if (kd->arch == NULL) { _kvm_err(kd, kd->program, "unsupported architecture"); goto failed; } /* * Non-native kernels require a symbol resolver. */ if (!kd->arch->ka_native(kd) && kd->resolve_symbol == NULL) { _kvm_err(kd, kd->program, "non-native kernel requires a symbol resolver"); goto failed; } /* * Initialize the virtual address translation machinery. */ if (kd->arch->ka_initvtop(kd) < 0) goto failed; return (kd); failed: /* * Copy out the error if doing sane error semantics. */ if (errout != NULL) strlcpy(errout, kd->errbuf, _POSIX2_LINE_MAX); (void)kvm_close(kd); return (NULL); } kvm_t * kvm_openfiles(const char *uf, const char *mf, const char *sf __unused, int flag, char *errout) { kvm_t *kd; if ((kd = calloc(1, sizeof(*kd))) == NULL) { if (errout != NULL) (void)strlcpy(errout, strerror(errno), _POSIX2_LINE_MAX); return (NULL); } return (_kvm_open(kd, uf, mf, flag, errout)); } kvm_t * kvm_open(const char *uf, const char *mf, const char *sf __unused, int flag, const char *errstr) { kvm_t *kd; if ((kd = calloc(1, sizeof(*kd))) == NULL) { if (errstr != NULL) (void)fprintf(stderr, "%s: %s\n", errstr, strerror(errno)); return (NULL); } kd->program = errstr; return (_kvm_open(kd, uf, mf, flag, NULL)); } kvm_t * kvm_open2(const char *uf, const char *mf, int flag, char *errout, int (*resolver)(const char *, kvaddr_t *)) { kvm_t *kd; if ((kd = calloc(1, sizeof(*kd))) == NULL) { if (errout != NULL) (void)strlcpy(errout, strerror(errno), _POSIX2_LINE_MAX); return (NULL); } kd->resolve_symbol = resolver; return (_kvm_open(kd, uf, mf, flag, errout)); } int kvm_close(kvm_t *kd) { int error = 0; if (kd == NULL) { errno = EINVAL; return (-1); } if (kd->vmst != NULL) kd->arch->ka_freevtop(kd); if (kd->pmfd >= 0) error |= close(kd->pmfd); if (kd->vmfd >= 0) error |= close(kd->vmfd); if (kd->nlfd >= 0) error |= close(kd->nlfd); if (kd->procbase != 0) free((void *)kd->procbase); if (kd->argbuf != 0) free((void *) kd->argbuf); if (kd->argspc != 0) free((void *) kd->argspc); if (kd->argv != 0) free((void *)kd->argv); + if (kd->dpcpu_initialized != 0) + free(kd->dpcpu_off); if (kd->pt_map != NULL) free(kd->pt_map); if (kd->page_map != NULL) free(kd->page_map); if (kd->sparse_map != MAP_FAILED) munmap(kd->sparse_map, kd->pt_sparse_size); free((void *)kd); return (error); } int kvm_nlist2(kvm_t *kd, struct kvm_nlist *nl) { /* * If called via the public interface, permit initialization of * further virtualized modules on demand. */ return (_kvm_nlist(kd, nl, 1)); } int kvm_nlist(kvm_t *kd, struct nlist *nl) { struct kvm_nlist *kl; int count, i, nfail; /* * Avoid reporting truncated addresses by failing for non-native * cores. */ if (!kvm_native(kd)) { _kvm_err(kd, kd->program, "kvm_nlist of non-native vmcore"); return (-1); } for (count = 0; nl[count].n_name != NULL && nl[count].n_name[0] != '\0'; count++) ; if (count == 0) return (0); kl = calloc(count + 1, sizeof(*kl)); + if (kl == NULL) { + _kvm_err(kd, kd->program, "cannot allocate memory"); + return (-1); + } for (i = 0; i < count; i++) kl[i].n_name = nl[i].n_name; nfail = kvm_nlist2(kd, kl); for (i = 0; i < count; i++) { nl[i].n_type = kl[i].n_type; nl[i].n_other = 0; nl[i].n_desc = 0; nl[i].n_value = kl[i].n_value; } + free(kl); return (nfail); } ssize_t kvm_read(kvm_t *kd, u_long kva, void *buf, size_t len) { return (kvm_read2(kd, kva, buf, len)); } ssize_t kvm_read2(kvm_t *kd, kvaddr_t kva, void *buf, size_t len) { int cc; ssize_t cr; off_t pa; char *cp; if (ISALIVE(kd)) { /* * We're using /dev/kmem. Just read straight from the * device and let the active kernel do the address translation. */ errno = 0; if (lseek(kd->vmfd, (off_t)kva, 0) == -1 && errno != 0) { _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)kva); return (-1); } cr = read(kd->vmfd, buf, len); if (cr < 0) { _kvm_syserr(kd, 0, "kvm_read"); return (-1); } else if (cr < (ssize_t)len) _kvm_err(kd, kd->program, "short read"); return (cr); } cp = buf; while (len > 0) { cc = kd->arch->ka_kvatop(kd, kva, &pa); if (cc == 0) return (-1); if (cc > (ssize_t)len) cc = len; errno = 0; if (lseek(kd->pmfd, pa, 0) == -1 && errno != 0) { _kvm_syserr(kd, 0, _PATH_MEM); break; } cr = read(kd->pmfd, cp, cc); if (cr < 0) { _kvm_syserr(kd, kd->program, "kvm_read"); break; } /* * If ka_kvatop returns a bogus value or our core file is * truncated, we might wind up seeking beyond the end of the * core file in which case the read will return 0 (EOF). */ if (cr == 0) break; cp += cr; kva += cr; len -= cr; } return (cp - (char *)buf); } ssize_t kvm_write(kvm_t *kd, u_long kva, const void *buf, size_t len) { int cc; ssize_t cw; off_t pa; const char *cp; if (!ISALIVE(kd) && !kd->writable) { _kvm_err(kd, kd->program, "kvm_write not implemented for dead kernels"); return (-1); } if (ISALIVE(kd)) { /* * Just like kvm_read, only we write. */ errno = 0; if (lseek(kd->vmfd, (off_t)kva, 0) == -1 && errno != 0) { _kvm_err(kd, 0, "invalid address (%lx)", kva); return (-1); } cc = write(kd->vmfd, buf, len); if (cc < 0) { _kvm_syserr(kd, 0, "kvm_write"); return (-1); } else if ((size_t)cc < len) _kvm_err(kd, kd->program, "short write"); return (cc); } cp = buf; while (len > 0) { cc = kd->arch->ka_kvatop(kd, kva, &pa); if (cc == 0) return (-1); if (cc > (ssize_t)len) cc = len; errno = 0; if (lseek(kd->pmfd, pa, 0) == -1 && errno != 0) { _kvm_syserr(kd, 0, _PATH_MEM); break; } cw = write(kd->pmfd, cp, cc); if (cw < 0) { _kvm_syserr(kd, kd->program, "kvm_write"); break; } /* * If ka_kvatop returns a bogus value or our core file is * truncated, we might wind up seeking beyond the end of the * core file in which case the read will return 0 (EOF). */ if (cw == 0) break; cp += cw; kva += cw; len -= cw; } return (cp - (const char *)buf); } int kvm_native(kvm_t *kd) { if (ISALIVE(kd)) return (1); return (kd->arch->ka_native(kd)); } int kvm_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *closure) { if (kd->arch->ka_walk_pages == NULL) return (0); return (kd->arch->ka_walk_pages(kd, cb, closure)); }