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
|
/*
*
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include "ion.h"
#include "ion_priv.h"
union ion_ioctl_arg {
struct ion_fd_data fd;
struct ion_allocation_data allocation;
struct ion_handle_data handle;
struct ion_heap_query query;
};
static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
{
int ret = 0;
switch (cmd) {
case ION_IOC_HEAP_QUERY:
ret = arg->query.reserved0 != 0;
ret |= arg->query.reserved1 != 0;
ret |= arg->query.reserved2 != 0;
break;
default:
break;
}
return ret ? -EINVAL : 0;
}
/* fix up the cases where the ioctl direction bits are incorrect */
static unsigned int ion_ioctl_dir(unsigned int cmd)
{
switch (cmd) {
case ION_IOC_FREE:
return _IOC_WRITE;
default:
return _IOC_DIR(cmd);
}
}
long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ion_client *client = filp->private_data;
struct ion_handle *cleanup_handle = NULL;
int ret = 0;
unsigned int dir;
union ion_ioctl_arg data;
dir = ion_ioctl_dir(cmd);
if (_IOC_SIZE(cmd) > sizeof(data))
return -EINVAL;
/*
* The copy_from_user is unconditional here for both read and write
* to do the validate. If there is no write for the ioctl, the
* buffer is cleared
*/
if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
return -EFAULT;
ret = validate_ioctl_arg(cmd, &data);
if (WARN_ON_ONCE(ret))
return ret;
if (!(dir & _IOC_WRITE))
memset(&data, 0, sizeof(data));
switch (cmd) {
case ION_IOC_ALLOC:
{
struct ion_handle *handle;
handle = ion_alloc(client, data.allocation.len,
data.allocation.heap_id_mask,
data.allocation.flags);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.allocation.handle = handle->id;
cleanup_handle = handle;
break;
}
case ION_IOC_FREE:
{
struct ion_handle *handle;
mutex_lock(&client->lock);
handle = ion_handle_get_by_id_nolock(client,
data.handle.handle);
if (IS_ERR(handle)) {
mutex_unlock(&client->lock);
return PTR_ERR(handle);
}
ion_free_nolock(client, handle);
ion_handle_put_nolock(handle);
mutex_unlock(&client->lock);
break;
}
case ION_IOC_SHARE:
{
struct ion_handle *handle;
handle = ion_handle_get_by_id(client, data.handle.handle);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.fd.fd = ion_share_dma_buf_fd(client, handle);
ion_handle_put(handle);
if (data.fd.fd < 0)
ret = data.fd.fd;
break;
}
case ION_IOC_HEAP_QUERY:
ret = ion_query_heaps(client, &data.query);
break;
default:
return -ENOTTY;
}
if (dir & _IOC_READ) {
if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
if (cleanup_handle)
ion_free(client, cleanup_handle);
return -EFAULT;
}
}
return ret;
}
|