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-rw-r--r--lib/test_sysctl.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
new file mode 100644
index 000000000..9a564971f
--- /dev/null
+++ b/lib/test_sysctl.c
@@ -0,0 +1,189 @@
+/*
+ * proc sysctl test driver
+ *
+ * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
+ *
+ * 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; or, when distributed separately from the Linux kernel or
+ * when incorporated into other software packages, subject to the following
+ * license:
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of copyleft-next (version 0.3.1 or later) as published
+ * at http://copyleft-next.org/.
+ */
+
+/*
+ * This module provides an interface to the proc sysctl interfaces. This
+ * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
+ * system unless explicitly requested by name. You can also build this driver
+ * into your kernel.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/async.h>
+#include <linux/delay.h>
+#include <linux/vmalloc.h>
+
+static int i_zero;
+static int i_one_hundred = 100;
+static int match_int_ok = 1;
+
+struct test_sysctl_data {
+ int int_0001;
+ int int_0002;
+ int int_0003[4];
+
+ int boot_int;
+
+ unsigned int uint_0001;
+
+ char string_0001[65];
+
+#define SYSCTL_TEST_BITMAP_SIZE 65536
+ unsigned long *bitmap_0001;
+};
+
+static struct test_sysctl_data test_data = {
+ .int_0001 = 60,
+ .int_0002 = 1,
+
+ .int_0003[0] = 0,
+ .int_0003[1] = 1,
+ .int_0003[2] = 2,
+ .int_0003[3] = 3,
+
+ .boot_int = 0,
+
+ .uint_0001 = 314,
+
+ .string_0001 = "(none)",
+};
+
+/* These are all under /proc/sys/debug/test_sysctl/ */
+static struct ctl_table test_table[] = {
+ {
+ .procname = "int_0001",
+ .data = &test_data.int_0001,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &i_zero,
+ .extra2 = &i_one_hundred,
+ },
+ {
+ .procname = "int_0002",
+ .data = &test_data.int_0002,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "int_0003",
+ .data = &test_data.int_0003,
+ .maxlen = sizeof(test_data.int_0003),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "match_int",
+ .data = &match_int_ok,
+ .maxlen = sizeof(match_int_ok),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "boot_int",
+ .data = &test_data.boot_int,
+ .maxlen = sizeof(test_data.boot_int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "uint_0001",
+ .data = &test_data.uint_0001,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_douintvec,
+ },
+ {
+ .procname = "string_0001",
+ .data = &test_data.string_0001,
+ .maxlen = sizeof(test_data.string_0001),
+ .mode = 0644,
+ .proc_handler = proc_dostring,
+ },
+ {
+ .procname = "bitmap_0001",
+ .data = &test_data.bitmap_0001,
+ .maxlen = SYSCTL_TEST_BITMAP_SIZE,
+ .mode = 0644,
+ .proc_handler = proc_do_large_bitmap,
+ },
+ { }
+};
+
+static struct ctl_table_header *test_sysctl_header;
+
+static int __init test_sysctl_init(void)
+{
+ int i;
+
+ struct {
+ int defined;
+ int wanted;
+ } match_int[] = {
+ {.defined = *(int *)SYSCTL_ZERO, .wanted = 0},
+ {.defined = *(int *)SYSCTL_ONE, .wanted = 1},
+ {.defined = *(int *)SYSCTL_TWO, .wanted = 2},
+ {.defined = *(int *)SYSCTL_THREE, .wanted = 3},
+ {.defined = *(int *)SYSCTL_FOUR, .wanted = 4},
+ {.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100},
+ {.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200},
+ {.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000},
+ {.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000},
+ {.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX},
+ {.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535},
+ {.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1},
+ };
+
+ for (i = 0; i < ARRAY_SIZE(match_int); i++)
+ if (match_int[i].defined != match_int[i].wanted)
+ match_int_ok = 0;
+
+ test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
+ if (!test_data.bitmap_0001)
+ return -ENOMEM;
+ test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
+ if (!test_sysctl_header) {
+ kfree(test_data.bitmap_0001);
+ return -ENOMEM;
+ }
+ return 0;
+}
+module_init(test_sysctl_init);
+
+static void __exit test_sysctl_exit(void)
+{
+ kfree(test_data.bitmap_0001);
+ if (test_sysctl_header)
+ unregister_sysctl_table(test_sysctl_header);
+}
+
+module_exit(test_sysctl_exit);
+
+MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
+MODULE_LICENSE("GPL");