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starved: signal if guest was reading beyond end of payload

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This commit is contained in:
Steffen Schulz 2020-12-29 01:13:43 +00:00
parent 95742719f5
commit c12c6bd70d
6 changed files with 22 additions and 2 deletions
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5
nyx/auxiliary_buffer.c
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@ -229,7 +229,12 @@ void reset_page_not_found_result_buffer(auxilary_buffer_t* auxilary_buffer){
}
void set_success_auxiliary_result_buffer(auxilary_buffer_t* auxilary_buffer, uint8_t success){
//should refactor to let caller directly set the result codes
if (success == 2) {
VOLATILE_WRITE_8(auxilary_buffer->result.exec_result_code, rc_starved);
} else {
VOLATILE_WRITE_8(auxilary_buffer->result.exec_result_code, rc_success);
}
}
void set_payload_buffer_write_reason_auxiliary_buffer(auxilary_buffer_t* auxilary_buffer, char* msg, uint32_t len){

1
nyx/auxiliary_buffer.h
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@ -45,6 +45,7 @@ enum nyx_result_codes {
rc_input_buffer_write = 4,
rc_aborted = 5,
rc_sanitizer = 6,
rc_starved = 7,
};
typedef struct auxilary_buffer_header_s{

7
nyx/hypercall/hypercall.c
View File

@ -349,6 +349,13 @@ void handle_hypercall_kafl_release(struct kvm_run *run, CPUState *cpu, uint64_t
if (init_state){
init_state = false;
} else {
//printf(CORE_PREFIX, "Got STARVED notification (num=%llu)\n", run->hypercall.args[0]);
if (run->hypercall.args[0] > 0) {
GET_GLOBAL_STATE()->starved = 1;
} else {
GET_GLOBAL_STATE()->starved = 0;
}
synchronization_disable_pt(cpu);
release_print_once(cpu);
}

1
nyx/state/state.c
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@ -89,6 +89,7 @@ void state_init_global(void){
global_state.in_fuzzing_mode = false;
global_state.in_reload_mode = true;
global_state.starved = false;
global_state.shutdown_requested = false;
global_state.cow_cache_full = false;

1
nyx/state/state.h
View File

@ -131,6 +131,7 @@ typedef struct qemu_nyx_state_s{
bool in_fuzzing_mode;
bool in_reload_mode;
bool starved;
bool shutdown_requested;
bool cow_cache_full;

5
nyx/synchronization.c
View File

@ -291,6 +291,11 @@ void synchronization_lock(void){
pthread_mutex_unlock(&synchronization_lock_mutex);
check_auxiliary_config_buffer(GET_GLOBAL_STATE()->auxilary_buffer, &GET_GLOBAL_STATE()->shadow_config);
//set_success_auxiliary_result_buffer(GET_GLOBAL_STATE()->auxilary_buffer, 1);
if (GET_GLOBAL_STATE()->starved == true)
set_success_auxiliary_result_buffer(GET_GLOBAL_STATE()->auxilary_buffer, 2);
else
set_success_auxiliary_result_buffer(GET_GLOBAL_STATE()->auxilary_buffer, 1);
GET_GLOBAL_STATE()->pt_trace_size = 0;