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ICE.c
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ICE.c
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// adapted from libvmi mem_evet example
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <inttypes.h>
#include <signal.h>
#include <glib.h>
#include <libvmi/libvmi.h>
#include <libvmi/events.h>
#define PAGE_SHIFT 12
#define PAGESIZE 4096
static bool interrupted = false;
static addr_t kernel_text_start_GVA;
static addr_t kernel_text_end_GVA;
static void close_handler(int sig) {
(void) sig;
interrupted = true;
}
event_response_t singlestep_cb(vmi_instance_t vmi, vmi_event_t *event) {
addr_t gfn = GPOINTER_TO_SIZE(event->data);
if (vmi_set_mem_event(vmi, gfn, VMI_MEMACCESS_W, 0) == VMI_FAILURE) {
fprintf(stderr, "ICE: singlestep_cb failed to set page permissions on gfn %llx\n", gfn);
}
return VMI_EVENT_RESPONSE_TOGGLE_SINGLESTEP;
}
// int register_singlestep_event(vmi_instance_t vmi, void *cb, vmi_event_t *singlestep_event_ptr) {
// SETUP_SINGLESTEP_EVENT(singlestep_event_ptr, VMI_BIT_MASK(0, vmi_get_num_vcpus(vmi) - 1), cb, false);
// if (VMI_FAILURE == vmi_register_event(vmi, singlestep_event_ptr)) {
// return 1;
// }
// return 0;
// }
event_response_t mem_cb(vmi_instance_t vmi, vmi_event_t *event) {
if (event->x86_regs->rip > kernel_text_start_GVA & event->x86_regs->rip < kernel_text_end_GVA) {
// printf("ICE; %RIP GVA %llx in kernel text, ignoring violation...\n", event->x86_regs->rip, event->mem_event.gfn << PAGE_SHIFT);
if (vmi_set_mem_event(vmi, event->mem_event.gfn, VMI_MEMACCESS_N, 0) == VMI_FAILURE) {
fprintf(stderr, "ICE: mem_cb failed to set page permissions on gfn %llx\n", event->mem_event.gfn);
}
vmi_event_t *singlestep_event_ptr = (vmi_event_t *) event->data;
singlestep_event_ptr->data = GSIZE_TO_POINTER(event->mem_event.gfn);
return VMI_EVENT_RESPONSE_TOGGLE_SINGLESTEP;
}
else {
// inject fault, then dump dmesg ??
printf("ICE: !! EPT WRITE VIOLATION @ GFN %llx\n", event->mem_event.gfn);
printf("ICE: @ GPA %llx\n", event->mem_event.gfn << PAGE_SHIFT);
printf("ICE: @ %RIP GVA %llx\n", event->x86_regs->rip);
printf("ICE: !! %RIP IS NOT IN KERNEL TEXT\n");
printf("ICE: pausing vm...\n");
vmi_pause_vm(vmi);
}
return VMI_EVENT_RESPONSE_NONE;
}
int register_mem_event_range(vmi_instance_t vmi, addr_t GVA_start, addr_t GVA_end, vmi_mem_access_t access_type, void *cb) {
// printf("ICE: registering mem_event on GVA range (%llx -> %llx)\n", GVA_start, GVA_end);
GVA_start = (GVA_start >> PAGE_SHIFT) << PAGE_SHIFT;
GVA_end = (GVA_end >> PAGE_SHIFT) << PAGE_SHIFT;
addr_t GPA_start;
addr_t GPA_end;
vmi_translate_kv2p(vmi, GVA_start, &GPA_start);
vmi_translate_kv2p(vmi, GVA_end, &GPA_end);
uint64_t gfn_start = GPA_start >> PAGE_SHIFT;
uint64_t gfn_end = GPA_end >> PAGE_SHIFT;
uint64_t n_frames = (GVA_end - GVA_start) / PAGESIZE;
printf("ICE: range aligned to page boundaries (%llx -> %llx), %lli frames\n", GVA_start, GVA_end, n_frames);
for (uint64_t i = gfn_start; i < gfn_end; i++) {
if (VMI_FAILURE == vmi_set_mem_event(vmi, i, access_type, 0)) {
fprintf(stderr, "ICE: register_mem_event_range failed to set page permissions on gfn %llx\n", i);
return 1;
}
}
printf("ICE: registered mem_event on GVA range (%llx -> %llx)\n", GVA_start, GVA_end);
return 0;
}
int main(int argc, char **argv) {
vmi_instance_t vmi = {0};
vmi_mode_t mode = {0};
vmi_event_t mem_event = {0};
vmi_event_t singlestep_event = {0};
struct sigaction act = {0};
vmi_init_data_t *init_data = NULL;
int status = 1;
act.sa_handler = close_handler;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGALRM, &act, NULL);
if (argc < 2) {
fprintf(stderr, "usage: %s <domain name>\n", argv[0]);
return status;
}
unsigned char logo[] = {
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};
printf("%s\n\n", logo);
char *domain_name = argv[1];
printf("ICE: connecting to domain %s... ", domain_name);
if (VMI_FAILURE == vmi_get_access_mode(NULL, (void*) domain_name, VMI_INIT_DOMAINNAME | VMI_INIT_EVENTS, init_data, &mode)) {
fprintf(stderr, "\nICE: failed to get access mode\n");
goto error_exit;
}
if (VMI_FAILURE == vmi_init_complete(&vmi, (void*) domain_name, VMI_INIT_DOMAINNAME | VMI_INIT_EVENTS, init_data, VMI_CONFIG_GLOBAL_FILE_ENTRY, NULL, NULL)) {
fprintf(stderr, "\nICE: failed to init libVMI library.\n");
goto error_exit;
}
page_mode_t page_mode = vmi_init_paging(vmi, 0);
printf("done\n");
printf("ICE: init paging mode %i\n", page_mode);
printf("ICE: pausing vm... ");
if (VMI_FAILURE == vmi_pause_vm(vmi)) {
fprintf(stderr, "Failed to pause vm\n");
goto error_exit;
}
printf("done\n");
addr_t kernel_text_start_GVA;
addr_t kernel_text_end_GVA;
addr_t kernel_text_start_GPA;
addr_t kernel_text_end_GPA;
vmi_translate_ksym2v(vmi, "_text", &kernel_text_start_GVA);
vmi_translate_kv2p(vmi, kernel_text_start_GVA, &kernel_text_start_GPA);
printf("ICE: kernel text start @ GVA %llx\n", kernel_text_start_GVA);
printf(" @ GPA %llx\n", kernel_text_start_GPA);
vmi_translate_ksym2v(vmi, "_etext", &kernel_text_end_GVA);
vmi_translate_kv2p(vmi, kernel_text_end_GVA, &kernel_text_end_GPA);
printf("ICE: kernel text end @ GVA %llx\n", kernel_text_end_GVA);
printf(" @ GPA %llx\n", kernel_text_end_GPA);
addr_t kernel_rodata_start_GVA;
addr_t kernel_rodata_end_GVA;
addr_t kernel_rodata_start_GPA;
addr_t kernel_rodata_end_GPA;
vmi_translate_ksym2v(vmi, "__start_rodata", &kernel_rodata_start_GVA);
vmi_translate_kv2p(vmi, kernel_text_start_GVA, &kernel_rodata_start_GPA);
printf("ICE: kernel rodata start @ GVA %llx\n", kernel_rodata_start_GVA);
printf(" @ GPA %llx\n", kernel_rodata_start_GPA);
vmi_translate_ksym2v(vmi, "__end_rodata", &kernel_rodata_end_GVA);
vmi_translate_kv2p(vmi, kernel_text_end_GVA, &kernel_rodata_end_GPA);
printf("ICE: kernel rodata end @ GVA %llx\n", kernel_rodata_end_GVA);
printf(" @ GPA %llx\n", kernel_rodata_end_GPA);
// if (register_singlestep_event(vmi, singlestep_cb, &singlestep_event)
// != 0) {
// goto error_exit;
// }
SETUP_SINGLESTEP_EVENT(&singlestep_event, VMI_BIT_MASK(0, vmi_get_num_vcpus(vmi) - 1), singlestep_cb, false);
if (VMI_FAILURE == vmi_register_event(vmi, &singlestep_event)) {
goto error_exit;
}
mem_event.data = (void *) &singlestep_event;
SETUP_MEM_EVENT(&mem_event, ~0ULL, VMI_MEMACCESS_W, mem_cb, true);
if (VMI_FAILURE == vmi_register_event(vmi, &mem_event)) {
fprintf(stderr, "ICE: register_mem_event_range failed\n");
return 1;
}
if (register_mem_event_range(vmi, kernel_text_start_GVA, kernel_text_end_GVA, VMI_MEMACCESS_W, mem_cb)
!= 0) {
goto error_exit;
}
if (register_mem_event_range(vmi, kernel_rodata_start_GVA, kernel_rodata_end_GVA, VMI_MEMACCESS_W, mem_cb)
!= 0) {
goto error_exit;
}
if (VMI_FAILURE == vmi_resume_vm(vmi)) {
fprintf(stderr, "ICE: failed to resume vm\n");
goto error_exit;
}
printf("ICE: VM resumed\n");
printf("ICE: EPT write protection set on GVA ranges (%llx -> %llx)\n", kernel_text_start_GVA, kernel_text_end_GVA);
printf("ICE: (%llx -> %llx)\n", kernel_rodata_start_GVA, kernel_rodata_end_GVA);
printf("ICE: waiting for violations...\n");
while (!interrupted) {
vmi_events_listen(vmi,500);
}
status = 0;
error_exit:
// free all mem events and free array
// unregister_mem_event_range(vmi, mem_event_arr, nframes);
vmi_clear_event(vmi, &mem_event, NULL);
vmi_resume_vm(vmi);
vmi_destroy(vmi);
return status;
}