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