1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (C) 2020 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.
*/
#define TLOG_TAG "lender"
#include <assert.h>
#include <inttypes.h>
#include <lk/macros.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <lib/tipc/tipc.h>
#include <lib/tipc/tipc_srv.h>
#include <lib/unittest/unittest.h>
#include <trusty/memref.h>
#include <trusty/sys/mman.h>
#include <trusty/time.h>
#include <trusty_unittest.h>
#include <lender.h>
#include <lender_consts.h>
#define PAGE_SIZE 0x1000
#define MAX_WRITE 0x800
static __attribute__((aligned(PAGE_SIZE))) char bss_page[PAGE_SIZE];
static __attribute__((aligned(PAGE_SIZE))) const char ro_page[PAGE_SIZE] = {1};
static __attribute__((aligned(PAGE_SIZE))) char rw_page[PAGE_SIZE] = {1};
#define MM_RW (MMAP_FLAG_PROT_READ | MMAP_FLAG_PROT_WRITE)
static handle_t bss_memref = INVALID_IPC_HANDLE;
static handle_t ro_memref = INVALID_IPC_HANDLE;
static handle_t rw_memref = INVALID_IPC_HANDLE;
static void init(void) {
int rc = memref_create(bss_page, PAGE_SIZE, MM_RW);
if (rc < 0) {
TLOGE("bss memref create failed: (%d)\n", rc);
abort();
}
bss_memref = rc;
rc = memref_create((void*)ro_page, PAGE_SIZE, MMAP_FLAG_PROT_READ);
if (rc < 0) {
TLOGE("ro memref create failed: (%d)\n", rc);
/* TODO abort on failure once bug 149849862 is resolved */
} else {
ro_memref = rc;
}
rc = memref_create(rw_page, PAGE_SIZE, MM_RW);
if (rc < 0) {
TLOGE("rw memref create failed: (%d)\n", rc);
abort();
}
rw_memref = rc;
}
static struct tipc_port_acl lender_port_acl = {
.flags = IPC_PORT_ALLOW_TA_CONNECT,
.uuid_num = 0,
.uuids = NULL,
.extra_data = NULL,
};
static struct tipc_port lender_port = {
.name = LENDER_PORT,
.msg_max_size = sizeof(struct lender_msg) + MAX_WRITE,
.msg_queue_len = 1,
.acl = &lender_port_acl,
.priv = NULL,
};
static int lender_lend(handle_t chan, enum lender_command cmd) {
handle_t to_lend;
switch (cmd) {
case LENDER_LEND_BSS:
to_lend = bss_memref;
break;
case LENDER_LEND_RO:
to_lend = ro_memref;
break;
case LENDER_LEND_RW:
to_lend = rw_memref;
break;
default:
TLOGE("Unsupported lend type %d\n", cmd);
return -1;
}
if (to_lend == INVALID_IPC_HANDLE) {
TLOGE("Refusing to lend uninitialized handle.\n");
return -1;
}
struct ipc_msg msg = {
.iov = NULL,
.num_iov = 0,
.handles = &to_lend,
.num_handles = 1,
};
return send_msg(chan, &msg);
}
static int lender_check_region(struct lender_region* region, size_t size) {
size_t end;
if (__builtin_add_overflow(region->offset, region->size, &end)) {
return -1;
}
if (end > size) {
return -1;
}
return 0;
}
static int lender_read_bss(handle_t chan, struct lender_region* region) {
if (lender_check_region(region, PAGE_SIZE) != 0) {
return -1;
}
int rc = tipc_send1(chan, &bss_page[region->offset], region->size);
if (rc != (int)region->size) {
return -1;
}
return 0;
}
static int lender_write_bss(handle_t chan,
struct lender_region* region,
const char* data) {
if (lender_check_region(region, PAGE_SIZE) != 0) {
return -1;
}
memcpy(&bss_page[region->offset], data, region->size);
return tipc_send1(chan, NULL, 0);
}
static int lender_on_message(const struct tipc_port* port,
handle_t chan,
void* ctx) {
assert(port == &lender_port);
assert(ctx == NULL);
struct lender_msg msg;
char data[MAX_WRITE];
int rc = tipc_recv2(chan, sizeof(msg), &msg, sizeof(msg), data,
sizeof(data));
if (rc < 0) {
TLOGE("Failed to receive message (%d)\n", rc);
return rc;
}
switch (msg.cmd) {
case LENDER_LEND_BSS:
case LENDER_LEND_RO:
case LENDER_LEND_RW:
rc = lender_lend(chan, msg.cmd);
if (rc < 0) {
return rc;
}
break;
case LENDER_SUICIDE:
exit(0);
break;
case LENDER_READ_BSS:
rc = lender_read_bss(chan, &msg.region);
if (rc < 0) {
return rc;
}
break;
case LENDER_WRITE_BSS:
if (rc - sizeof(struct lender_msg) != msg.region.size) {
return -1;
}
rc = lender_write_bss(chan, &msg.region, data);
if (rc < 0) {
return rc;
}
break;
default:
TLOGE("Bad command: %d\n", msg.cmd);
return -1;
}
return 0;
}
static struct tipc_srv_ops lender_ops = {
.on_message = lender_on_message,
};
int main(void) {
init();
struct tipc_hset* hset = tipc_hset_create();
if (!hset) {
return -1;
}
int rc = tipc_add_service(hset, &lender_port, 1, 1, &lender_ops);
if (rc < 0) {
return rc;
}
rc = tipc_run_event_loop(hset);
TLOGE("lender going down: (%d)\n", rc);
return rc;
}
|
