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
|
/*
* Copyright (c) 2013-2014 NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/dma-mapping.h>
#include "ote_protocol.h"
#define TE_SHMEM_FNAME_SZ SZ_64
#define TE_SHMEM_DATA_SZ SZ_128K
struct te_file_req_shmem {
char file_name[TE_SHMEM_FNAME_SZ];
char file_data[TE_SHMEM_DATA_SZ];
};
struct te_file_req_node {
struct list_head node;
struct te_file_req *req;
};
static struct list_head req_list;
static DECLARE_COMPLETION(req_ready);
static DECLARE_COMPLETION(req_complete);
static unsigned long secure_error;
static void indicate_complete(unsigned long ret)
{
tlk_generic_smc(TE_SMC_FS_OP_DONE, ret, 0);
}
int te_handle_fs_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
struct te_file_req new_req, *ptr_user_req = NULL;
struct te_file_req_node *req_node;
switch (ioctl_num) {
case TE_IOCTL_FILE_NEW_REQ: /* new request */
ptr_user_req = (struct te_file_req *)ioctl_param;
/* wait for a new request */
if (wait_for_completion_interruptible(&req_ready)) {
return -ENODATA;
}
/* dequeue new request from the secure world */
req_node = list_first_entry(&req_list, struct te_file_req_node,
node);
/* populate request for the non-secure client */
if (req_node) {
if (copy_to_user(ptr_user_req, req_node->req,
sizeof(struct te_file_req))) {
pr_err("copy_to_user failed for new request\n");
return -EFAULT;
}
list_del(&req_node->node);
kfree(req_node);
} else {
pr_err("no request available\n");
return -ENOMEM;
}
break;
case TE_IOCTL_FILE_FILL_BUF: /* pass data to be written to the file */
if (copy_from_user(&new_req, (void __user *)ioctl_param,
sizeof(struct te_file_req))) {
pr_err("copy_from_user failed for request\n");
return -EFAULT;
}
if (new_req.type != OTE_FILE_REQ_WRITE)
return -EINVAL;
if (!new_req.kern_data_buf || !new_req.user_data_buf)
return -EINVAL;
if (copy_to_user(new_req.user_data_buf, new_req.kern_data_buf,
new_req.data_len)) {
pr_err("copy_to_user failed for fill buffer\n");
return -EFAULT;
}
break;
case TE_IOCTL_FILE_REQ_COMPLETE: /* request complete */
if (copy_from_user(&new_req, (void __user *)ioctl_param,
sizeof(struct te_file_req))) {
pr_err("copy_from_user failed for request\n");
return -EFAULT;
}
if (new_req.type == OTE_FILE_REQ_READ && !new_req.error) {
if (copy_from_user(new_req.kern_data_buf,
(void __user *)new_req.user_data_buf,
new_req.data_len)) {
pr_err("copy_from_user failed for request\n");
return -EFAULT;
}
}
/* get error code */
secure_error = (new_req.error) ? OTE_ERROR_NO_DATA
: new_req.result;
/* signal the producer */
complete(&req_complete);
break;
}
return 0;
}
static void _te_fs_file_operation(const char *name, void *buf, int len,
enum te_file_req_type type)
{
struct te_file_req *new_req;
struct te_file_req_node *req_node;
BUG_ON(!name);
if (type == OTE_FILE_REQ_READ || type == OTE_FILE_REQ_WRITE)
BUG_ON(!buf);
/* allocate te_file_req structure */
new_req = kzalloc(sizeof(struct te_file_req), GFP_KERNEL);
BUG_ON(!new_req);
/* prepare a new request */
strncpy(new_req->name, name, strlen(name));
new_req->type = type;
new_req->data_len = len;
new_req->result = 0;
new_req->kern_data_buf = buf;
new_req->error = 0;
req_node = kzalloc(sizeof(struct te_file_req_node), GFP_KERNEL);
BUG_ON(!req_node);
req_node->req = new_req;
INIT_LIST_HEAD(&req_node->node);
/* add it to the pending queue and signal the consumer */
list_add_tail(&req_list, &req_node->node);
complete(&req_ready);
/* wait for the consumer's signal */
wait_for_completion(&req_complete);
kfree(new_req);
/* signal completion to the secure world */
indicate_complete(secure_error);
}
void tlk_fread(const char *name, void *buf, int len)
{
if (!buf)
_te_fs_file_operation(name, buf, len, OTE_FILE_REQ_SIZE);
else
_te_fs_file_operation(name, buf, len, OTE_FILE_REQ_READ);
}
void tlk_fwrite(const char *name, void *buf, int len)
{
_te_fs_file_operation(name, buf, len, OTE_FILE_REQ_WRITE);
}
void tlk_fdelete(const char *name)
{
_te_fs_file_operation(name, NULL, 0, OTE_FILE_REQ_DELETE);
}
static int __init tlk_fs_register_handlers(void)
{
struct te_file_req_shmem *shmem_ptr;
uint32_t smc_args[MAX_EXT_SMC_ARGS];
dma_addr_t shmem_dma;
shmem_ptr = dma_alloc_coherent(NULL, sizeof(struct te_file_req_shmem),
&shmem_dma, GFP_KERNEL);
if (!shmem_ptr) {
pr_err("%s: no memory available for fs operations\n", __func__);
return -ENOMEM;
}
memset(shmem_ptr, 0, sizeof(struct te_file_req_shmem));
INIT_LIST_HEAD(&req_list);
init_completion(&req_ready);
init_completion(&req_complete);
smc_args[0] = TE_SMC_REGISTER_FS_HANDLERS;
smc_args[1] = (uint32_t)tlk_fread;
smc_args[2] = (uint32_t)tlk_fwrite;
smc_args[3] = (uint32_t)tlk_fdelete;
smc_args[4] = (uint32_t)shmem_ptr->file_name;
smc_args[5] = (uint32_t)shmem_ptr->file_data;
tlk_extended_smc(smc_args);
return 0;
}
arch_initcall(tlk_fs_register_handlers);
|
