a9f56210b8
In particular, - avoid dereferencing NULL pointers - test pointers against NULL, not 0 - test for errout == NULL in the top-level functions (kvm_open, kvm_openfiles, kvm_open2, etc) - Replace a realloc and free on failure with reallocf Found with: devel/cocchinelle Differential Revision: https://reviews.freebsd.org/D5954 MFC after: 1 week Reviewed by: jhb Sponsored by: EMC / Isilon Storage Division
322 lines
8.9 KiB
C
322 lines
8.9 KiB
C
/*-
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* Copyright (c) 2006 Peter Wemm
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* AMD64 machine dependent routines for kvm and minidumps.
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*/
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <kvm.h>
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#include "../../sys/amd64/include/minidump.h"
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#include <limits.h>
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#include "kvm_private.h"
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#include "kvm_amd64.h"
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#define amd64_round_page(x) roundup2((kvaddr_t)(x), AMD64_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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struct hpt hpt;
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amd64_pte_t *page_map;
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};
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static int
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_amd64_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_X86_64) &&
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_kvm_is_minidump(kd));
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}
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static void
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_amd64_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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_kvm_hpt_free(&vm->hpt);
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if (vm->page_map)
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free(vm->page_map);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_amd64_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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uint64_t *bitmap;
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off_t off;
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vmst = _kvm_malloc(kd, sizeof(*vmst));
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if (vmst == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vmst;
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if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
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sizeof(vmst->hdr)) {
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_kvm_err(kd, kd->program, "cannot read dump header");
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return (-1);
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}
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if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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return (-1);
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}
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/*
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* NB: amd64 minidump header is binary compatible between version 1
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* and version 2; this may not be the case for the future versions.
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*/
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vmst->hdr.version = le32toh(vmst->hdr.version);
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if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
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_kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
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MINIDUMP_VERSION, vmst->hdr.version);
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return (-1);
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}
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vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
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vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
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vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
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vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
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vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
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vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
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/* Skip header and msgbuf */
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off = AMD64_PAGE_SIZE + amd64_round_page(vmst->hdr.msgbufsize);
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bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
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if (bitmap == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
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return (-1);
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}
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if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
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(ssize_t)vmst->hdr.bitmapsize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
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free(bitmap);
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return (-1);
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}
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off += amd64_round_page(vmst->hdr.bitmapsize);
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vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
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if (vmst->page_map == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for page_map", vmst->hdr.pmapsize);
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free(bitmap);
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return (-1);
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}
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if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) !=
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(ssize_t)vmst->hdr.pmapsize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for page_map", vmst->hdr.pmapsize);
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free(bitmap);
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return (-1);
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}
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off += vmst->hdr.pmapsize;
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/* build physical address hash table for sparse pages */
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_kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
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AMD64_PAGE_SIZE, sizeof(*bitmap));
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free(bitmap);
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return (0);
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}
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static int
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_amd64_minidump_vatop_v1(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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amd64_physaddr_t offset;
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amd64_pte_t pte;
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kvaddr_t pteindex;
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amd64_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & AMD64_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> AMD64_PAGE_SHIFT;
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if (pteindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
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goto invalid;
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pte = le64toh(vm->page_map[pteindex]);
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if ((pte & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: pte not valid");
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goto invalid;
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}
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a = pte & AMD64_PG_FRAME;
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: physical address 0x%jx not in minidump",
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(uintmax_t)a);
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goto invalid;
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}
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*pa = ofs + offset;
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return (AMD64_PAGE_SIZE - offset);
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} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: direct map address 0x%jx not in minidump",
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(uintmax_t)va);
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goto invalid;
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}
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*pa = ofs + offset;
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return (AMD64_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: virtual address 0x%jx not minidumped",
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(uintmax_t)va);
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goto invalid;
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}
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
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return (0);
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}
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static int
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_amd64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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amd64_pte_t pt[AMD64_NPTEPG];
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struct vmstate *vm;
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amd64_physaddr_t offset;
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amd64_pde_t pde;
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amd64_pte_t pte;
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kvaddr_t pteindex;
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kvaddr_t pdeindex;
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amd64_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & AMD64_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pdeindex = (va - vm->hdr.kernbase) >> AMD64_PDRSHIFT;
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if (pdeindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
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goto invalid;
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pde = le64toh(vm->page_map[pdeindex]);
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if ((pde & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: pde not valid");
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goto invalid;
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}
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if ((pde & AMD64_PG_PS) == 0) {
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a = pde & AMD64_PG_FRAME;
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: pt physical address 0x%jx not in minidump",
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(uintmax_t)a);
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goto invalid;
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}
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/* TODO: Just read the single PTE */
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if (pread(kd->pmfd, &pt, AMD64_PAGE_SIZE, ofs) !=
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AMD64_PAGE_SIZE) {
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_kvm_err(kd, kd->program,
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"cannot read %d bytes for page table",
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AMD64_PAGE_SIZE);
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return (-1);
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}
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pteindex = (va >> AMD64_PAGE_SHIFT) &
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(AMD64_NPTEPG - 1);
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pte = le64toh(pt[pteindex]);
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if ((pte & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: pte not valid");
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goto invalid;
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}
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a = pte & AMD64_PG_FRAME;
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} else {
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a = pde & AMD64_PG_PS_FRAME;
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a += (va & AMD64_PDRMASK) ^ offset;
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}
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: physical address 0x%jx not in minidump",
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(uintmax_t)a);
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goto invalid;
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}
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*pa = ofs + offset;
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return (AMD64_PAGE_SIZE - offset);
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} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: direct map address 0x%jx not in minidump",
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(uintmax_t)va);
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goto invalid;
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}
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*pa = ofs + offset;
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return (AMD64_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: virtual address 0x%jx not minidumped",
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(uintmax_t)va);
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goto invalid;
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}
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
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return (0);
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}
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static int
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_amd64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0,
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"_amd64_minidump_kvatop called in live kernel!");
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return (0);
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}
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if (((struct vmstate *)kd->vmst)->hdr.version == 1)
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return (_amd64_minidump_vatop_v1(kd, va, pa));
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else
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return (_amd64_minidump_vatop(kd, va, pa));
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}
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struct kvm_arch kvm_amd64_minidump = {
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.ka_probe = _amd64_minidump_probe,
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.ka_initvtop = _amd64_minidump_initvtop,
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.ka_freevtop = _amd64_minidump_freevtop,
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.ka_kvatop = _amd64_minidump_kvatop,
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.ka_native = _amd64_native,
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};
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KVM_ARCH(kvm_amd64_minidump);
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