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6cad1ecd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1 |
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2 | /* |
3 | * proc sysctl test driver | |
4 | * | |
5 | * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> | |
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6 | */ |
7 | ||
8 | /* | |
2d046981 | 9 | * This module provides an interface to the proc sysctl interfaces. This |
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10 | * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the |
11 | * system unless explicitly requested by name. You can also build this driver | |
12 | * into your kernel. | |
13 | */ | |
14 | ||
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
16 | ||
17 | #include <linux/init.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/printk.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/miscdevice.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/async.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/vmalloc.h> | |
28 | ||
29 | static int i_zero; | |
30 | static int i_one_hundred = 100; | |
57b19468 | 31 | static int match_int_ok = 1; |
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32 | |
33 | struct test_sysctl_data { | |
34 | int int_0001; | |
eb965eda | 35 | int int_0002; |
7c43a657 | 36 | int int_0003[4]; |
eb965eda | 37 | |
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38 | int boot_int; |
39 | ||
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40 | unsigned int uint_0001; |
41 | ||
9308f2f9 | 42 | char string_0001[65]; |
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43 | |
44 | #define SYSCTL_TEST_BITMAP_SIZE 65536 | |
45 | unsigned long *bitmap_0001; | |
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46 | }; |
47 | ||
48 | static struct test_sysctl_data test_data = { | |
49 | .int_0001 = 60, | |
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50 | .int_0002 = 1, |
51 | ||
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52 | .int_0003[0] = 0, |
53 | .int_0003[1] = 1, | |
54 | .int_0003[2] = 2, | |
55 | .int_0003[3] = 3, | |
56 | ||
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57 | .boot_int = 0, |
58 | ||
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59 | .uint_0001 = 314, |
60 | ||
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61 | .string_0001 = "(none)", |
62 | }; | |
63 | ||
64 | /* These are all under /proc/sys/debug/test_sysctl/ */ | |
65 | static struct ctl_table test_table[] = { | |
66 | { | |
67 | .procname = "int_0001", | |
68 | .data = &test_data.int_0001, | |
69 | .maxlen = sizeof(int), | |
70 | .mode = 0644, | |
71 | .proc_handler = proc_dointvec_minmax, | |
72 | .extra1 = &i_zero, | |
73 | .extra2 = &i_one_hundred, | |
74 | }, | |
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75 | { |
76 | .procname = "int_0002", | |
77 | .data = &test_data.int_0002, | |
78 | .maxlen = sizeof(int), | |
79 | .mode = 0644, | |
80 | .proc_handler = proc_dointvec, | |
81 | }, | |
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82 | { |
83 | .procname = "int_0003", | |
84 | .data = &test_data.int_0003, | |
85 | .maxlen = sizeof(test_data.int_0003), | |
86 | .mode = 0644, | |
87 | .proc_handler = proc_dointvec, | |
88 | }, | |
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89 | { |
90 | .procname = "match_int", | |
91 | .data = &match_int_ok, | |
92 | .maxlen = sizeof(match_int_ok), | |
93 | .mode = 0444, | |
94 | .proc_handler = proc_dointvec, | |
95 | }, | |
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96 | { |
97 | .procname = "boot_int", | |
98 | .data = &test_data.boot_int, | |
99 | .maxlen = sizeof(test_data.boot_int), | |
100 | .mode = 0644, | |
101 | .proc_handler = proc_dointvec, | |
102 | .extra1 = SYSCTL_ZERO, | |
103 | .extra2 = SYSCTL_ONE, | |
104 | }, | |
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105 | { |
106 | .procname = "uint_0001", | |
107 | .data = &test_data.uint_0001, | |
108 | .maxlen = sizeof(unsigned int), | |
109 | .mode = 0644, | |
110 | .proc_handler = proc_douintvec, | |
111 | }, | |
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112 | { |
113 | .procname = "string_0001", | |
114 | .data = &test_data.string_0001, | |
115 | .maxlen = sizeof(test_data.string_0001), | |
116 | .mode = 0644, | |
117 | .proc_handler = proc_dostring, | |
118 | }, | |
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119 | { |
120 | .procname = "bitmap_0001", | |
121 | .data = &test_data.bitmap_0001, | |
122 | .maxlen = SYSCTL_TEST_BITMAP_SIZE, | |
123 | .mode = 0644, | |
124 | .proc_handler = proc_do_large_bitmap, | |
125 | }, | |
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126 | { } |
127 | }; | |
128 | ||
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129 | static struct ctl_table_header *test_sysctl_header; |
130 | ||
131 | static int __init test_sysctl_init(void) | |
132 | { | |
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133 | int i; |
134 | ||
135 | struct { | |
136 | int defined; | |
137 | int wanted; | |
138 | } match_int[] = { | |
139 | {.defined = *(int *)SYSCTL_ZERO, .wanted = 0}, | |
140 | {.defined = *(int *)SYSCTL_ONE, .wanted = 1}, | |
141 | {.defined = *(int *)SYSCTL_TWO, .wanted = 2}, | |
142 | {.defined = *(int *)SYSCTL_THREE, .wanted = 3}, | |
143 | {.defined = *(int *)SYSCTL_FOUR, .wanted = 4}, | |
144 | {.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100}, | |
145 | {.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200}, | |
146 | {.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000}, | |
147 | {.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000}, | |
148 | {.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX}, | |
149 | {.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535}, | |
150 | {.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1}, | |
151 | }; | |
152 | ||
153 | for (i = 0; i < ARRAY_SIZE(match_int); i++) | |
154 | if (match_int[i].defined != match_int[i].wanted) | |
155 | match_int_ok = 0; | |
156 | ||
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157 | test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL); |
158 | if (!test_data.bitmap_0001) | |
159 | return -ENOMEM; | |
04bc883c | 160 | test_sysctl_header = register_sysctl("debug/test_sysctl", test_table); |
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161 | if (!test_sysctl_header) { |
162 | kfree(test_data.bitmap_0001); | |
9308f2f9 | 163 | return -ENOMEM; |
2ea622b8 | 164 | } |
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165 | return 0; |
166 | } | |
2f56f845 | 167 | module_init(test_sysctl_init); |
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168 | |
169 | static void __exit test_sysctl_exit(void) | |
170 | { | |
2ea622b8 | 171 | kfree(test_data.bitmap_0001); |
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172 | if (test_sysctl_header) |
173 | unregister_sysctl_table(test_sysctl_header); | |
174 | } | |
175 | ||
176 | module_exit(test_sysctl_exit); | |
177 | ||
178 | MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); | |
179 | MODULE_LICENSE("GPL"); |