1 /*
2 * Copyright (C) 2024 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 <dlfcn.h>
18 #include <stdlib.h>
19
20 #include "../includes/common.h"
21 #include "../includes/memutils.h"
22 #include "nci_hmsgs.h"
23
24 #define BUFFER_SIZE 16
25 #define OVERFLOWED_VALUE 2
26
27 char enable_selective_overload = ENABLE_NONE;
28
29 static void (*real_GKI_freebuf)(void *ptr) = nullptr;
30 static void *(*real_GKI_getpoolbuf)(uint8_t pool_id) = nullptr;
31 char *buffer = nullptr;
32
init(void)33 void init(void) {
34 real_GKI_freebuf = (void (*)(void *))dlsym(RTLD_NEXT, "_Z11GKI_freebufPv");
35 real_GKI_getpoolbuf = (void *(*)(uint8_t))dlsym(RTLD_NEXT, "_Z14GKI_getpoolbufh");
36 FAIL_CHECK(real_GKI_freebuf);
37 FAIL_CHECK(real_GKI_getpoolbuf);
38 }
39
GKI_getpoolbuf(uint8_t pool_id)40 void *GKI_getpoolbuf(uint8_t pool_id) {
41 if (pool_id == OVERFLOWED_VALUE) {
42 buffer = (char *)malloc(BUFFER_SIZE);
43 return (void *)(buffer + BUFFER_SIZE - OVERFLOWED_VALUE);
44 }
45 return real_GKI_getpoolbuf(pool_id);
46 }
47
GKI_freebuf(void * ptr)48 void GKI_freebuf(void *ptr) {
49 if (buffer) {
50 if (ptr == (void *)(buffer + BUFFER_SIZE - OVERFLOWED_VALUE)) {
51 free(buffer);
52 buffer = nullptr;
53 return;
54 }
55 }
56 real_GKI_freebuf(ptr);
57 }
58
main()59 int main() {
60 uint8_t p_param_tlvs[UINT8_MAX];
61
62 // tlv_size is set to UINT8_MAX which leads to an integer overflow. The fix returns if the
63 // integer oveflow is observed. Without fix, a buffer of size 2 (which is less than required)
64 // gets allocated. This leads to a OOB access in nci_snd_set_routing_cmd and a SIG_SEGV occurs
65 // which leads to test failure.
66 init();
67 enable_selective_overload = ENABLE_ALL;
68 nci_snd_set_routing_cmd(false /* more */, 0 /* num_tlv */, UINT8_MAX, p_param_tlvs);
69 enable_selective_overload = ENABLE_FREE_CHECK | ENABLE_REALLOC_CHECK;
70 return EXIT_SUCCESS;
71 }
72