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1 | /* |
2 | * This module provides an interface to trigger and test firmware loading. |
3 | * |
4 | * It is designed to be used for basic evaluation of the firmware loading |
5 | * subsystem (for example when validating firmware verification). It lacks |
6 | * any extra dependencies, and will not normally be loaded by the system |
7 | * unless explicitly requested by name. |
8 | */ |
9 | |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> |
14 | #include <linux/printk.h> |
15 | #include <linux/firmware.h> |
16 | #include <linux/device.h> |
17 | #include <linux/fs.h> |
18 | #include <linux/miscdevice.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/uaccess.h> |
21 | |
22 | static DEFINE_MUTEX(test_fw_mutex); |
23 | static const struct firmware *test_firmware; |
24 | |
25 | static ssize_t test_fw_misc_read(struct file *f, char __user *buf, |
26 | size_t size, loff_t *offset) |
27 | { |
28 | ssize_t rc = 0; |
29 | |
30 | mutex_lock(&test_fw_mutex); |
31 | if (test_firmware) |
32 | rc = simple_read_from_buffer(buf, size, offset, |
33 | test_firmware->data, |
34 | test_firmware->size); |
35 | mutex_unlock(&test_fw_mutex); |
36 | return rc; |
37 | } |
38 | |
39 | static const struct file_operations test_fw_fops = { |
40 | .owner = THIS_MODULE, |
41 | .read = test_fw_misc_read, |
42 | }; |
43 | |
44 | static struct miscdevice test_fw_misc_device = { |
45 | .minor = MISC_DYNAMIC_MINOR, |
46 | .name = "test_firmware", |
47 | .fops = &test_fw_fops, |
48 | }; |
49 | |
50 | static ssize_t trigger_request_store(struct device *dev, |
51 | struct device_attribute *attr, |
52 | const char *buf, size_t count) |
53 | { |
54 | int rc; |
55 | char *name; |
56 | |
57 | name = kzalloc(count + 1, GFP_KERNEL); |
58 | if (!name) |
59 | return -ENOSPC; |
60 | memcpy(name, buf, count); |
61 | |
62 | pr_info("loading '%s'\n", name); |
63 | |
64 | mutex_lock(&test_fw_mutex); |
65 | release_firmware(test_firmware); |
66 | test_firmware = NULL; |
67 | rc = request_firmware(&test_firmware, name, dev); |
68 | if (rc) |
69 | pr_info("load of '%s' failed: %d\n", name, rc); |
70 | pr_info("loaded: %zu\n", test_firmware ? test_firmware->size : 0); |
71 | mutex_unlock(&test_fw_mutex); |
72 | |
73 | kfree(name); |
74 | |
75 | return count; |
76 | } |
77 | static DEVICE_ATTR_WO(trigger_request); |
78 | |
79 | static int __init test_firmware_init(void) |
80 | { |
81 | int rc; |
82 | |
83 | rc = misc_register(&test_fw_misc_device); |
84 | if (rc) { |
85 | pr_err("could not register misc device: %d\n", rc); |
86 | return rc; |
87 | } |
88 | rc = device_create_file(test_fw_misc_device.this_device, |
89 | &dev_attr_trigger_request); |
90 | if (rc) { |
91 | pr_err("could not create sysfs interface: %d\n", rc); |
92 | goto dereg; |
93 | } |
94 | |
95 | pr_warn("interface ready\n"); |
96 | |
97 | return 0; |
98 | dereg: |
99 | misc_deregister(&test_fw_misc_device); |
100 | return rc; |
101 | } |
102 | |
103 | module_init(test_firmware_init); |
104 | |
105 | static void __exit test_firmware_exit(void) |
106 | { |
107 | release_firmware(test_firmware); |
108 | device_remove_file(test_fw_misc_device.this_device, |
109 | &dev_attr_trigger_request); |
110 | misc_deregister(&test_fw_misc_device); |
111 | pr_warn("removed interface\n"); |
112 | } |
113 | |
114 | module_exit(test_firmware_exit); |
115 | |
116 | MODULE_AUTHOR("Kees Cook <keescook@chromium.org>"); |
117 | MODULE_LICENSE("GPL"); |
118 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9