// hypercall-initiated taint query of some src-level extent
void lava_taint_query (PandaHypercallStruct phs) {
extern CPUState *cpu_single_env;
CPUState *env = cpu_single_env;
if (taintEnabled && (taint2_num_labels_applied() > 0)){
// okay, taint is on and some labels have actually been applied
// is there *any* taint on this extent
uint32_t num_tainted = 0;
for (uint32_t offset=0; offset<phs.len; offset++) {
uint32_t va = phs.buf + offset;
uint32_t pa = panda_virt_to_phys(env, va);
if ((int) pa != -1) {
Addr a = make_maddr(pa);
if (taint2_query(a)) {
num_tainted ++;
}
}
}
if (num_tainted) {
// ok at least one byte in the extent is tainted
// 1. write the pandalog entry that tells us something was tainted on this extent
Panda__TaintQueryHypercall *tqh = (Panda__TaintQueryHypercall *) malloc (sizeof (Panda__TaintQueryHypercall));
*tqh = PANDA__TAINT_QUERY_HYPERCALL__INIT;
tqh->buf = phs.buf;
tqh->len = phs.len;
tqh->num_tainted = num_tainted;
// obtain the actual data out of memory
// NOTE: first 32 bytes only!
uint32_t data[32];
uint32_t n = phs.len;
if (32 < phs.len) n = 32;
for (uint32_t i=0; i<n; i++) {
data[i] = 0;
uint8_t c;
panda_virtual_memory_rw(env, phs.buf+i, &c, 1, false);
data[i] = c;
}
tqh->n_data = n;
tqh->data = data;
Panda__LogEntry ple = PANDA__LOG_ENTRY__INIT;
ple.taint_query_hypercall = tqh;
pandalog_write_entry(&ple);
free(tqh);
// 2. write out src-level info
lava_src_info_pandalog(phs);
// 3. write out callstack info
callstack_pandalog();
// 4. iterate over the bytes in the extent and pandalog detailed info about taint
for (uint32_t offset=0; offset<phs.len; offset++) {
uint32_t va = phs.buf + offset;
uint32_t pa = panda_virt_to_phys(env, va);
if ((int) pa != -1) {
Addr a = make_maddr(pa);
if (taint2_query(a)) {
__taint2_query_pandalog(a);
}
}
}
}
}
}
uint8_t taint2_query_pandalog (Addr a) {
return __taint2_query_pandalog(a);
}
Panda__TaintQuery *taint2_query_pandalog (Addr addr, uint32_t offset) {
return __taint2_query_pandalog(addr, offset);
}
// hypercall-initiated taint query of some src-level extent
void lava_taint_query (PandaHypercallStruct phs) {
extern CPUState *cpu_single_env;
CPUState *env = cpu_single_env;
if (pandalog && taintEnabled && (taint2_num_labels_applied() > 0)){
// okay, taint is on and some labels have actually been applied
// is there *any* taint on this extent
uint32_t num_tainted = 0;
for (uint32_t offset=0; offset<phs.len; offset++) {
uint32_t va = phs.buf + offset;
uint32_t pa = panda_virt_to_phys(env, va);
if ((int) pa != -1) {
Addr a = make_maddr(pa);
if (taint2_query(a)) {
num_tainted ++;
}
}
}
if (num_tainted) {
// ok at least one byte in the extent is tainted
// 1. write the pandalog entry that tells us something was tainted on this extent
Panda__TaintQueryHypercall *tqh = (Panda__TaintQueryHypercall *) malloc (sizeof (Panda__TaintQueryHypercall));
*tqh = PANDA__TAINT_QUERY_HYPERCALL__INIT;
tqh->buf = phs.buf;
tqh->len = phs.len;
tqh->num_tainted = num_tainted;
// obtain the actual data out of memory
// NOTE: first 32 bytes only!
uint32_t data[32];
uint32_t n = phs.len;
// grab at most 32 bytes from memory to pandalog
// this is just a snippet. we dont want to write 1M buffer
if (32 < phs.len) n = 32;
for (uint32_t i=0; i<n; i++) {
data[i] = 0;
uint8_t c;
panda_virtual_memory_rw(env, phs.buf+i, &c, 1, false);
data[i] = c;
}
tqh->n_data = n;
tqh->data = data;
// 2. write out src-level info
Panda__SrcInfo *si = pandalog_src_info_create(phs);
tqh->src_info = si;
// 3. write out callstack info
Panda__CallStack *cs = pandalog_callstack_create();
tqh->call_stack = cs;
// 4. iterate over the bytes in the extent and pandalog detailed info about taint
std::vector<Panda__TaintQuery *> tq;
for (uint32_t offset=0; offset<phs.len; offset++) {
uint32_t va = phs.buf + offset;
uint32_t pa = panda_virt_to_phys(env, va);
if ((int) pa != -1) {
Addr a = make_maddr(pa);
if (taint2_query(a)) {
tq.push_back(__taint2_query_pandalog(a, offset));
}
}
}
tqh->n_taint_query = tq.size();
tqh->taint_query = (Panda__TaintQuery **) malloc(sizeof(Panda__TaintQuery *) * tqh->n_taint_query);
for (uint32_t i=0; i<tqh->n_taint_query; i++) {
tqh->taint_query[i] = tq[i];
}
Panda__LogEntry ple = PANDA__LOG_ENTRY__INIT;
ple.taint_query_hypercall = tqh;
pandalog_write_entry(&ple);
free(tqh->src_info);
pandalog_callstack_free(tqh->call_stack);
for (uint32_t i=0; i<tqh->n_taint_query; i++) {
__pandalog_taint_query_free(tqh->taint_query[i]);
}
free(tqh);
}
}
}