static status_t
linux_system_map_symbol_to_address(
vmi_instance_t vmi,
const char *symbol,
addr_t *address)
{
FILE *f = NULL;
char *row = NULL;
status_t ret = VMI_FAILURE;
linux_instance_t linux_instance = vmi->os_data;
if (linux_instance == NULL) {
errprint("VMI_ERROR: OS instance not initialized\n");
goto done;
}
if ((NULL == linux_instance->sysmap) || (strlen(linux_instance->sysmap) == 0)) {
errprint("VMI_WARNING: No linux sysmap configured\n");
goto done;
}
row = g_malloc0(MAX_ROW_LENGTH);
if ( !row )
goto done;
if ((f = fopen(linux_instance->sysmap, "r")) == NULL) {
fprintf(stderr,
"ERROR: could not find System.map file after checking:\n");
fprintf(stderr, "\t%s\n", linux_instance->sysmap);
fprintf(stderr,
"To fix this problem, add the correct sysmap entry to /etc/libvmi.conf\n");
address = 0;
goto done;
}
if (get_symbol_row(f, row, symbol, 2) == VMI_FAILURE) {
address = 0;
goto done;
}
(*address) = (addr_t) strtoull(row, NULL, 16);
ret = VMI_SUCCESS;
done:
if (row)
free(row);
if (f)
fclose(f);
return ret;
}
int linux_system_map_symbol_to_address (
xa_instance_t *instance, char *symbol, uint32_t *address)
{
FILE *f = NULL;
char *row = NULL;
int ret = XA_SUCCESS;
if ((NULL == instance->sysmap) || (strlen(instance->sysmap) == 0)){
#ifdef ENABLE_XEN
instance->sysmap =
linux_predict_sysmap_name(instance->m.xen.domain_id);
#endif /* ENABLE_XEN */
}
if ((row = malloc(MAX_ROW_LENGTH)) == NULL ){
ret = XA_FAILURE;
goto error_exit;
}
if ((f = fopen(instance->sysmap, "r")) == NULL){
fprintf(stderr, "ERROR: could not find System.map file after checking:\n");
fprintf(stderr, "\t%s\n", instance->sysmap);
fprintf(stderr, "To fix this problem, add the correct sysmap entry to /etc/xenaccess.conf\n");
ret = XA_FAILURE;
goto error_exit;
}
if (get_symbol_row(f, row, symbol, 2) == XA_FAILURE){
ret = XA_FAILURE;
goto error_exit;
}
*address = (uint32_t) strtoul(row, NULL, 16);
error_exit:
if (row) free(row);
if (f) fclose(f);
return ret;
}
char* linux_system_map_address_to_symbol(
vmi_instance_t vmi,
addr_t address,
const access_context_t *ctx)
{
FILE *f = NULL;
char *row = NULL;
char* address_str = NULL;
char* it = NULL;
char* symbol = NULL;
int size = 0;
linux_instance_t linux_instance = vmi->os_data;
#ifdef ENABLE_SAFETY_CHECKS
if (!linux_instance) {
errprint("VMI_ERROR: OS instance not initialized\n");
goto done;
}
#endif
address -= linux_instance->kaslr_offset;
switch (ctx->translate_mechanism) {
case VMI_TM_PROCESS_PID:
if (ctx->pid != 0)
goto err;
break;
case VMI_TM_PROCESS_DTB:
if (ctx->dtb != vmi->kpgd)
goto err;
break;
default:
goto err;
};
if ((NULL == linux_instance->sysmap) || (strlen(linux_instance->sysmap) == 0)) {
errprint("VMI_WARNING: No linux sysmap configured\n");
goto done;
}
row = g_malloc0(MAX_ROW_LENGTH);
if ( !row )
goto done;
if ((f = fopen(linux_instance->sysmap, "r")) == NULL) {
fprintf(stderr,
"ERROR: could not find System.map file after checking:\n");
fprintf(stderr, "\t%s\n", linux_instance->sysmap);
fprintf(stderr,
"To fix this problem, add the correct sysmap entry to /etc/libvmi.conf\n");
goto done;
}
size = snprintf(NULL,0,"%"PRIx64"", address) + 1;
address_str = g_malloc0(size);
snprintf(address_str, size, "%"PRIx64"", address);
if (get_symbol_row(f, row, address_str, 0) == VMI_FAILURE) {
goto done;
}
// skip two columns
for (it=row; *it!=0; it++);
for (it++; *it!=0; it++);
it++;
symbol = strdup(it);
done:
if (row)
free(row);
if (f)
fclose(f);
if (address_str)
free(address_str);
return symbol;
err:
errprint("VMI_WARNING: Lookup is implemented for kernel symbols only\n");
return NULL;
}
