1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <nfc_int.h>
18 #include <rw_int.h>
19 #include <dlfcn.h>
20 #include <unistd.h>
21
22 #include "../includes/common.h"
23 #include "../includes/memutils.h"
24
25 #define T3T_MSG_FELICALITE_MC_OFFSET 0x01
26
27 char enable_selective_overload = ENABLE_NONE;
28 char *vulnPtr = nullptr;
29
30 bool testInProgress = false;
31 struct sigaction new_action, old_action;
sigsegv_handler(int signum,siginfo_t * info,void * context)32 void sigsegv_handler(int signum, siginfo_t *info, void* context) {
33 if (testInProgress && info->si_signo == SIGSEGV) {
34 size_t pageSize = getpagesize();
35 if (pageSize) {
36 char *vulnPtrGuardPage = (char *) ((size_t) vulnPtr & PAGE_MASK) + pageSize;
37 char *faultPage = (char *) ((size_t) info->si_addr & PAGE_MASK);
38 if (faultPage == vulnPtrGuardPage) {
39 (*old_action.sa_sigaction)(signum, info, context);
40 return;
41 }
42 }
43 }
44 _exit(EXIT_FAILURE);
45 }
46
47 extern tRW_CB rw_cb;
48 extern tNFC_CB nfc_cb;
49 void rw_init(void);
50 tNFC_STATUS rw_t3t_select(uint8_t peer_nfcid2[NCI_RF_F_UID_LEN],
51 uint8_t mrti_check, uint8_t mrti_update);
52
53 static void (*real_GKI_freebuf)(void* ptr) = nullptr;
54 void *kAllocatedPointers[2];
55 int allocatedPointersIndex = -1;
56 bool kIsInitialized = false;
57
init(void)58 void init(void) {
59 real_GKI_freebuf = (void (*)(void*))dlsym(RTLD_NEXT, "_Z11GKI_freebufPv");
60 if (!real_GKI_freebuf) {
61 return;
62 }
63
64 kIsInitialized = true;
65 }
66
GKI_freebuf(void * ptr)67 void GKI_freebuf(void* ptr) {
68 if (!kIsInitialized) {
69 init();
70 }
71 if (ptr == kAllocatedPointers[0] || ptr == kAllocatedPointers[1]) {
72 return;
73 } else {
74 real_GKI_freebuf(ptr);
75 }
76 }
77
allocate_memory(size_t size)78 void *allocate_memory(size_t size) {
79 void *ptr = memalign(16, size);
80 memset(ptr, 0x0, size);
81 kAllocatedPointers[++allocatedPointersIndex] = ptr;
82 return ptr;
83 }
84
85 // borrowed from rw_i93.cc
86 enum {
87 RW_T3T_CMD_DETECT_NDEF,
88 RW_T3T_CMD_CHECK_NDEF,
89 RW_T3T_CMD_UPDATE_NDEF,
90 RW_T3T_CMD_CHECK,
91 RW_T3T_CMD_UPDATE,
92 RW_T3T_CMD_SEND_RAW_FRAME,
93 RW_T3T_CMD_GET_SYSTEM_CODES,
94 RW_T3T_CMD_FORMAT,
95 RW_T3T_CMD_SET_READ_ONLY_SOFT,
96 RW_T3T_CMD_SET_READ_ONLY_HARD,
97
98 RW_T3T_CMD_MAX
99 };
100
101 // borrowed from rw_i93.cc
102 enum {
103 RW_T3T_STATE_NOT_ACTIVATED,
104 RW_T3T_STATE_IDLE,
105 RW_T3T_STATE_COMMAND_PENDING
106 };
107
108 // borrowed from rw_i93.cc
109 enum {
110 /* Sub states for formatting Felica-Lite */
111 RW_T3T_FMT_SST_POLL_FELICA_LITE, /* Waiting for POLL Felica-Lite response (for
112 formatting) */
113 RW_T3T_FMT_SST_CHECK_MC_BLK, /* Waiting for Felica-Lite MC (MemoryControl)
114 block-read to complete */
115 RW_T3T_FMT_SST_UPDATE_MC_BLK, /* Waiting for Felica-Lite MC (MemoryControl)
116 block-write to complete */
117 RW_T3T_FMT_SST_UPDATE_NDEF_ATTRIB, /* Waiting for NDEF attribute block-write
118 to complete */
119
120 /* Sub states for setting Felica-Lite read only */
121 RW_T3T_SRO_SST_POLL_FELICA_LITE, /* Waiting for POLL Felica-Lite response (for
122 setting read only) */
123 RW_T3T_SRO_SST_UPDATE_NDEF_ATTRIB, /* Waiting for NDEF attribute block-write
124 to complete */
125 RW_T3T_SRO_SST_CHECK_MC_BLK, /* Waiting for Felica-Lite MC (MemoryControl)
126 block-read to complete */
127 RW_T3T_SRO_SST_UPDATE_MC_BLK /* Waiting for Felica-Lite MC (MemoryControl)
128 block-write to complete */
129 };
130
cback(tRW_EVENT event,tRW_DATA * p_data)131 void cback(tRW_EVENT event __attribute__((unused)),
132 tRW_DATA* p_data __attribute__((unused))) {
133 }
134
main()135 int main() {
136 sigemptyset(&new_action.sa_mask);
137 new_action.sa_flags = SA_SIGINFO;
138 new_action.sa_sigaction = sigsegv_handler;
139 sigaction(SIGSEGV, &new_action, &old_action);
140 tRW_T3T_CB* p_t3t = &rw_cb.tcb.t3t;
141
142 GKI_init();
143 rw_init();
144
145 uint8_t peer_nfcid2[NCI_RF_F_UID_LEN];
146 uint8_t mrti_check = 1, mrti_update = 1;
147 enable_selective_overload = ENABLE_MEMALIGN_CHECK;
148 if (rw_t3t_select(peer_nfcid2, mrti_check, mrti_update) != NFC_STATUS_OK) {
149 return EXIT_FAILURE;
150 }
151
152 tNFC_CONN *p_data = (tNFC_CONN *) allocate_memory(sizeof(tNFC_CONN));
153 if (!p_data) {
154 return EXIT_FAILURE;
155 }
156 p_data->data.p_data = (NFC_HDR *) allocate_memory(sizeof(NFC_HDR) * 4);
157 enable_selective_overload = ENABLE_FREE_CHECK | ENABLE_REALLOC_CHECK;
158 if (!(p_data->data.p_data)) {
159 free(p_data);
160 return EXIT_FAILURE;
161 }
162 vulnPtr = (char *)p_data->data.p_data;
163 p_data->status = NFC_STATUS_OK;
164
165 p_t3t->cur_cmd = RW_T3T_CMD_SET_READ_ONLY_HARD;
166 p_t3t->rw_state = RW_T3T_STATE_COMMAND_PENDING;
167 p_t3t->rw_substate = RW_T3T_SRO_SST_CHECK_MC_BLK;
168
169 NFC_HDR* p_msg = (p_data->data).p_data;
170 p_msg->len = T3T_MSG_RSP_COMMON_HDR_LEN;
171
172 uint8_t* p_t3t_rsp = (uint8_t*) (p_msg + 1) + (p_msg->offset + 1);
173 p_t3t_rsp[T3T_MSG_RSP_OFFSET_RSPCODE] = T3T_MSG_OPC_CHECK_RSP;
174 p_t3t_rsp[T3T_MSG_RSP_OFFSET_STATUS1] = T3T_MSG_RSP_STATUS_OK;
175
176 uint8_t* p_mc = &p_t3t_rsp[T3T_MSG_RSP_OFFSET_CHECK_DATA];
177 p_mc[T3T_MSG_FELICALITE_MC_OFFSET_SYS_OP] = T3T_MSG_FELICALITE_MC_OFFSET;
178
179 tNFC_CONN_CB* p_cb = &nfc_cb.conn_cb[NFC_RF_CONN_ID];
180 tNFC_CONN_EVT event = NFC_DATA_CEVT;
181 TIMER_LIST_ENT pFirst = { };
182 nfc_cb.quick_timer_queue.p_first = &pFirst;
183
184 rw_cb.p_cback = &cback;
185 testInProgress = true;
186 p_cb->p_cback(0, event, p_data);
187 testInProgress = false;
188
189 free(p_data->data.p_data);
190 free(p_data);
191
192 return EXIT_SUCCESS;
193 }
194