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QEMU-Nyx-fork/nyx/state.c

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/*
Copyright (C) 2019 Sergej Schumilo
This file is part of QEMU-PT (HyperTrash / kAFL).
QEMU-PT is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
QEMU-PT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with QEMU-PT. If not, see <http://www.gnu.org/licenses/>.
*/
#include "nyx/state.h"
#include "nyx/debug.h"
#include "nyx/memory_access.h"
#include "sysemu/kvm.h"
#include "nyx/auxiliary_buffer.h"
#include "nyx/sharedir.h"
#include "nyx/fast_vm_reload_sync.h"
#include "nyx/helpers.h"
//#define STATE_VERBOSE
/* global singleton */
struct state_qemu_pt global_state;
#define LIBXDC_RELEASE_VERSION_REQUIRED 2
void state_init_global(void){
#ifdef STATE_VERBOSE
fprintf(stderr, "--> %s <--\n", __func__);
#endif
/* safety first */
assert(libxdc_get_release_version() == LIBXDC_RELEASE_VERSION_REQUIRED);
global_state.nyx_fdl = false;
global_state.workdir_path = NULL;
global_state.fast_reload_enabled = false;
global_state.fast_reload_mode = false;
global_state.fast_reload_path = NULL;
global_state.fast_reload_pre_path = NULL;
global_state.fast_reload_pre_image = false;
global_state.fast_reload_snapshot = fast_reload_new();
global_state.reload_state = init_fast_vm_reload_sync();
global_state.decoder = NULL;
global_state.page_cache = NULL;
global_state.redqueen_enable_pending = false;
global_state.redqueen_disable_pending = false;
global_state.redqueen_instrumentation_mode = 0;
global_state.redqueen_update_blacklist = false;
global_state.patches_enable_pending = false;
global_state.patches_disable_pending = false;
global_state.redqueen_state = NULL;
for(uint8_t i = 0; i < INTEL_PT_MAX_RANGES; i++){
global_state.pt_ip_filter_configured[i] = false;
global_state.pt_ip_filter_enabled[i] = false;
global_state.pt_ip_filter_a[i] = 0x0;
global_state.pt_ip_filter_b[i] = 0x0;
}
global_state.pt_c3_filter = 0;
global_state.enable_hprintf = false;
global_state.parent_cr3 = 0;
global_state.disassembler_word_width = 64;
global_state.nested = false;
global_state.payload_buffer = 0;
global_state.nested_payload_pages = NULL;
global_state.nested_payload_pages_num = 0;
global_state.protect_payload_buffer = 0;
global_state.discard_tmp_snapshot = 0;
global_state.mem_mode = mm_unkown;
init_timeout_detector(&(global_state.timeout_detector));
global_state.in_fuzzing_mode = false;
global_state.in_reload_mode = true;
global_state.shutdown_requested = false;
global_state.cow_cache_full = false;
global_state.auxilary_buffer = NULL;
memset(&global_state.shadow_config, 0x0, sizeof(auxilary_buffer_config_t));
global_state.decoder_page_fault = false;
global_state.decoder_page_fault_addr = 0x0;
global_state.dump_page = false;
global_state.dump_page_addr = 0x0;
global_state.in_redqueen_reload_mode = false;
global_state.pt_trace_mode = true;
global_state.pt_trace_mode_force = false;
global_state.sharedir = sharedir_new();
global_state.shared_bitmap_fd = 0;
global_state.shared_bitmap_size = 0;
global_state.shared_ijon_bitmap_size = 0;
global_state.shared_payload_buffer_fd = 0;
global_state.shared_payload_buffer_size = 0;
global_state.shared_bitmap_ptr = NULL;
global_state.pt_trace_size = 0;
global_state.bb_coverage = 0;
global_state.cap_timeout_detection = 0;
global_state.cap_only_reload_mode = 0;
global_state.cap_compile_time_tracing = 0;
global_state.cap_ijon_tracing = 0;
global_state.cap_cr3 = 0;
global_state.cap_compile_time_tracing_buffer_vaddr = 0;
global_state.cap_ijon_tracing_buffer_vaddr = 0;
QTAILQ_INIT(&global_state.redqueen_breakpoints);
}
fast_reload_t* get_fast_reload_snapshot(void){
return global_state.fast_reload_snapshot;
}
void set_fast_reload_mode(bool mode){
global_state.fast_reload_mode = mode;
}
void set_fast_reload_path(const char* path){
assert(global_state.fast_reload_path == NULL);
global_state.fast_reload_path = malloc(strlen(path)+1);
strcpy(global_state.fast_reload_path, path);
}
void set_fast_reload_pre_path(const char* path){
assert(global_state.fast_reload_pre_path == NULL);
global_state.fast_reload_pre_path = malloc(strlen(path)+1);
strcpy(global_state.fast_reload_pre_path, path);
}
void set_fast_reload_pre_image(void){
assert(global_state.fast_reload_pre_path != NULL);
global_state.fast_reload_pre_image = true;
}
void enable_fast_reloads(void){
assert(global_state.fast_reload_path != NULL);
global_state.fast_reload_enabled = true;
}
void init_page_cache(char* path){
assert(global_state.page_cache == NULL);
global_state.page_cache = page_cache_new((CPUState *)qemu_get_cpu(0), path);
#ifdef STATE_VERBOSE
debug_printf("\n\nINIT PAGE_CACHE => %s\n", path);
#endif
}
page_cache_t* get_page_cache(void){
assert(global_state.page_cache);
return global_state.page_cache;
}
void init_redqueen_state(void){
global_state.redqueen_state = new_rq_state((CPUState *)qemu_get_cpu(0), get_page_cache());
}
redqueen_t* get_redqueen_state(void){
assert(global_state.redqueen_state != NULL);
return global_state.redqueen_state;
}
void dump_global_state(const char* filename_prefix){
debug_printf("%s\n", __func__);
char* tmp;
assert(asprintf(&tmp, "%s/global.state", filename_prefix) != -1);
debug_printf("%s\n", tmp);
FILE *fp = fopen(tmp, "wb");
if(fp == NULL) {
debug_fprintf(stderr, "[%s] Could not open file %s.\n", __func__, tmp);
assert(false);
//exit(EXIT_FAILURE);
}
debug_printf("DUMPING global_state.pt_ip_filter_configured: -\n");
fwrite(&global_state.pt_ip_filter_configured, sizeof(bool)*4, 1, fp);
debug_printf("DUMPING global_state.pt_ip_filter_a: -\n");
fwrite(&global_state.pt_ip_filter_a, sizeof(uint64_t)*4, 1, fp);
debug_printf("DUMPING global_state.pt_ip_filter_b: -\n");
fwrite(&global_state.pt_ip_filter_b, sizeof(uint64_t)*4, 1, fp);
debug_printf("DUMPING global_state.enable_hprintf: %x\n", global_state.enable_hprintf);
fwrite(&global_state.enable_hprintf, sizeof(bool), 1, fp);
debug_printf("DUMPING global_state.parent_cr3: %lx\n", global_state.parent_cr3);
fwrite(&global_state.parent_cr3, sizeof(uint64_t), 1, fp);
debug_printf("DUMPING global_state.disassembler_word_width: %x\n", global_state.disassembler_word_width);
fwrite(&global_state.disassembler_word_width, sizeof(uint8_t), 1, fp);
debug_printf("DUMPING global_state.fast_reload_pre_image: %x\n", global_state.fast_reload_pre_image);
fwrite(&global_state.fast_reload_pre_image, sizeof(bool), 1, fp);
debug_printf("DUMPING global_state.mem_mode: %x\n", global_state.mem_mode);
fwrite(&global_state.mem_mode, sizeof(uint8_t), 1, fp);
debug_printf("DUMPING global_state.pt_trace_mode: %x\n", global_state.pt_trace_mode);
fwrite(&global_state.pt_trace_mode, sizeof(bool), 1, fp);
debug_printf("DUMPING global_state.nested: %x\n", global_state.nested);
fwrite(&global_state.nested, sizeof(bool), 1, fp);
if(!global_state.nested){
debug_printf("DUMPING global_state.payload_buffer: %lx\n", global_state.payload_buffer);
fwrite(&global_state.payload_buffer, sizeof(uint64_t), 1, fp);
fwrite(&global_state.cap_timeout_detection, sizeof(global_state.cap_timeout_detection), 1, fp);
fwrite(&global_state.cap_only_reload_mode, sizeof(global_state.cap_only_reload_mode), 1, fp);
fwrite(&global_state.cap_compile_time_tracing, sizeof(global_state.cap_compile_time_tracing), 1, fp);
fwrite(&global_state.cap_ijon_tracing, sizeof(global_state.cap_ijon_tracing), 1, fp);
fwrite(&global_state.cap_cr3, sizeof(global_state.cap_cr3), 1, fp);
fwrite(&global_state.cap_compile_time_tracing_buffer_vaddr, sizeof(global_state.cap_compile_time_tracing_buffer_vaddr), 1, fp);
fwrite(&global_state.cap_ijon_tracing_buffer_vaddr, sizeof(global_state.cap_ijon_tracing_buffer_vaddr), 1, fp);
fwrite(&global_state.protect_payload_buffer, sizeof(bool), 1, fp);
}
else{
assert(global_state.nested_payload_pages != NULL && global_state.nested_payload_pages_num != 0);
debug_printf("DUMPING global_state.nested_payload_pages_num: %x\n", global_state.nested_payload_pages_num);
fwrite(&global_state.nested_payload_pages_num, sizeof(uint32_t), 1, fp);
if(global_state.nested_payload_pages_num != 0){
debug_printf("DUMPING global_state.protect_payload_buffer: %x\n", global_state.protect_payload_buffer);
fwrite(&global_state.protect_payload_buffer, sizeof(bool), 1, fp);
}
for(uint32_t i = 0; i < global_state.nested_payload_pages_num; i++){
debug_printf("DUMPING global_state.nested_payload_pages[%d]: %lx\n", i, global_state.nested_payload_pages[i]);
fwrite(&global_state.nested_payload_pages[i], sizeof(uint64_t), 1, fp);
}
}
fclose(fp);
free(tmp);
}
void load_global_state(const char* filename_prefix){
debug_printf("%s\n", __func__);
char* tmp;
assert(asprintf(&tmp, "%s/global.state", filename_prefix) != -1);
debug_printf("%s\n", tmp);
FILE *fp = fopen(tmp, "rb");
if(fp == NULL) {
debug_fprintf(stderr, "[%s] Could not open file %s.\n", __func__, tmp);
assert(false);
//exit(EXIT_FAILURE);
}
assert(fread(&global_state.pt_ip_filter_configured, sizeof(bool)*4, 1, fp) == 1);
debug_printf("LOADING global_state.pt_ip_filter_configured: -\n");
assert(fread(&global_state.pt_ip_filter_a, sizeof(uint64_t)*4, 1, fp) == 1);
debug_printf("LOADING global_state.pt_ip_filter_a: -\n");
assert(fread(&global_state.pt_ip_filter_b, sizeof(uint64_t)*4, 1, fp) == 1);
debug_printf("LOADING global_state.pt_ip_filter_b: -\n");
assert(fread(&global_state.enable_hprintf, sizeof(bool), 1, fp) == 1);
debug_printf("LOADING global_state.enable_hprintf: %x\n", global_state.enable_hprintf);
assert(fread(&global_state.parent_cr3, sizeof(uint64_t), 1, fp) == 1);
debug_printf("LOADING global_state.parent_cr3: %lx\n", global_state.parent_cr3);
assert(fread(&global_state.disassembler_word_width, sizeof(uint8_t), 1, fp) == 1);
debug_printf("LOADING global_state.disassembler_word_width: %x\n", global_state.disassembler_word_width);
assert(fread(&global_state.fast_reload_pre_image, sizeof(bool), 1, fp) == 1);
debug_printf("LOADING global_state.fast_reload_pre_image: %x\n", global_state.fast_reload_pre_image);
assert(fread(&global_state.mem_mode, sizeof(uint8_t), 1, fp) == 1);
debug_printf("LOADING global_state.mem_mode: %x\n", global_state.mem_mode);
assert(fread(&global_state.pt_trace_mode, sizeof(bool), 1, fp) == 1);
debug_printf("LOADING global_state.pt_trace_mode: %x\n", global_state.pt_trace_mode);
assert(fread(&global_state.nested, sizeof(bool), 1, fp) == 1);
debug_printf("LOADING global_state.nested: %x\n", global_state.nested);
if(!global_state.nested){
assert(fread(&global_state.payload_buffer, sizeof(uint64_t), 1, fp) == 1);
debug_printf("LOADING global_state.payload_buffer: %lx\n", global_state.payload_buffer);
assert(fread(&global_state.cap_timeout_detection, sizeof(global_state.cap_timeout_detection), 1, fp) == 1);
assert(fread(&global_state.cap_only_reload_mode, sizeof(global_state.cap_only_reload_mode), 1, fp) == 1);
assert(fread(&global_state.cap_compile_time_tracing, sizeof(global_state.cap_compile_time_tracing), 1, fp) == 1);
assert(fread(&global_state.cap_ijon_tracing, sizeof(global_state.cap_ijon_tracing), 1, fp) == 1);
assert(fread(&global_state.cap_cr3, sizeof(global_state.cap_cr3), 1, fp) == 1);
assert(fread(&global_state.cap_compile_time_tracing_buffer_vaddr, sizeof(global_state.cap_compile_time_tracing_buffer_vaddr), 1, fp) == 1);
assert(fread(&global_state.cap_ijon_tracing_buffer_vaddr, sizeof(global_state.cap_ijon_tracing_buffer_vaddr), 1, fp) == 1);
if(!global_state.fast_reload_pre_image){
assert(fread(&global_state.protect_payload_buffer, sizeof(bool), 1, fp) == 1);
if(global_state.payload_buffer != 0){
debug_printf("REMAP PAYLOAD BUFFER!\n");
remap_payload_buffer(global_state.payload_buffer, ((CPUState *)qemu_get_cpu(0)) );
}
else{
fprintf(stderr, "WARNING: address of payload buffer in snapshot file is zero!\n");
}
}
apply_capabilities(qemu_get_cpu(0));
}
else{
assert(fread(&global_state.nested_payload_pages_num, sizeof(uint32_t), 1, fp) == 1);
debug_printf("LOADING global_state.nested_payload_pages_num: %x\n", global_state.nested_payload_pages_num);
global_state.in_fuzzing_mode = true; /* haaaeeeeh ??? */
if(!global_state.fast_reload_pre_image){
assert(fread(&global_state.protect_payload_buffer, sizeof(bool), 1, fp) == 1);
debug_printf("LOADING global_state.protect_payload_buffer: %x\n", global_state.protect_payload_buffer);
global_state.nested_payload_pages = (uint64_t*)malloc(sizeof(uint64_t)*global_state.nested_payload_pages_num);
for(uint32_t i = 0; i < global_state.nested_payload_pages_num; i++){
assert(fread(&global_state.nested_payload_pages[i], sizeof(uint64_t), 1, fp) == 1);
debug_printf("LOADED global_state.nested_payload_pages[%d]: %lx\n", i, global_state.nested_payload_pages[i]);
if(global_state.protect_payload_buffer){
assert(remap_payload_slot_protected(GET_GLOBAL_STATE()->nested_payload_pages[i], i, ((CPUState *)qemu_get_cpu(0))) == true);
}
else{
remap_payload_slot(global_state.nested_payload_pages[i], i, ((CPUState *)qemu_get_cpu(0)));
}
}
}
}
fclose(fp);
free(tmp);
}
static void* alloc_auxiliary_buffer(const char* file){
void* ptr;
struct stat st;
int fd = open(file, O_CREAT|O_RDWR, S_IRWXU|S_IRWXG|S_IRWXO);
assert(ftruncate(fd, AUX_BUFFER_SIZE) == 0);
stat(file, &st);
QEMU_PT_PRINTF(INTERFACE_PREFIX, "new aux buffer file: (max size: %x) %lx", AUX_BUFFER_SIZE, st.st_size);
assert(AUX_BUFFER_SIZE == st.st_size);
ptr = mmap(0, AUX_BUFFER_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
fprintf(stderr, "aux buffer allocation failed!\n");
return (void*)-1;
}
return ptr;
}
void init_aux_buffer(const char* filename){
global_state.auxilary_buffer = (auxilary_buffer_t*)alloc_auxiliary_buffer(filename);
init_auxiliary_buffer(global_state.auxilary_buffer);
}
void set_payload_buffer(uint64_t payload_buffer){
assert(global_state.payload_buffer == 0 && global_state.nested == false);
global_state.payload_buffer = payload_buffer;
global_state.nested = false;
}
void set_payload_pages(uint64_t* payload_pages, uint32_t pages){
assert(global_state.nested_payload_pages == NULL && global_state.nested_payload_pages_num == 0);
global_state.nested_payload_pages = (uint64_t*)malloc(sizeof(uint64_t)*pages);
global_state.nested_payload_pages_num = pages;
memcpy(global_state.nested_payload_pages, payload_pages, sizeof(uint64_t)*pages);
global_state.nested = true;
}
void set_workdir_path(char* workdir){
assert(workdir && !global_state.workdir_path);
assert(asprintf(&global_state.workdir_path, "%s", workdir) != -1);
}
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