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-rw-r--r--lib/test_sysctl.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
new file mode 100644
index 0000000000..8036aa91a1
--- /dev/null
+++ b/lib/test_sysctl.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
+/*
+ * proc sysctl test driver
+ *
+ * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.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;
+
+
+static struct {
+ struct ctl_table_header *test_h_setup_node;
+ struct ctl_table_header *test_h_mnt;
+ struct ctl_table_header *test_h_mnterror;
+} sysctl_test_headers;
+
+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 void test_sysctl_calc_match_int_ok(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;
+}
+
+static int test_sysctl_setup_node_tests(void)
+{
+ test_sysctl_calc_match_int_ok();
+ test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
+ if (!test_data.bitmap_0001)
+ return -ENOMEM;
+ sysctl_test_headers.test_h_setup_node = register_sysctl("debug/test_sysctl", test_table);
+ if (!sysctl_test_headers.test_h_setup_node) {
+ kfree(test_data.bitmap_0001);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/* Used to test that unregister actually removes the directory */
+static struct ctl_table test_table_unregister[] = {
+ {
+ .procname = "unregister_error",
+ .data = &test_data.int_0001,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ },
+ {}
+};
+
+static int test_sysctl_run_unregister_nested(void)
+{
+ struct ctl_table_header *unregister;
+
+ unregister = register_sysctl("debug/test_sysctl/unregister_error",
+ test_table_unregister);
+ if (!unregister)
+ return -ENOMEM;
+
+ unregister_sysctl_table(unregister);
+ return 0;
+}
+
+static int test_sysctl_run_register_mount_point(void)
+{
+ sysctl_test_headers.test_h_mnt
+ = register_sysctl_mount_point("debug/test_sysctl/mnt");
+ if (!sysctl_test_headers.test_h_mnt)
+ return -ENOMEM;
+
+ sysctl_test_headers.test_h_mnterror
+ = register_sysctl("debug/test_sysctl/mnt/mnt_error",
+ test_table_unregister);
+ /*
+ * Don't check the result.:
+ * If it fails (expected behavior), return 0.
+ * If successful (missbehavior of register mount point), we want to see
+ * mnt_error when we run the sysctl test script
+ */
+
+ return 0;
+}
+
+static int __init test_sysctl_init(void)
+{
+ int err;
+
+ err = test_sysctl_setup_node_tests();
+ if (err)
+ goto out;
+
+ err = test_sysctl_run_unregister_nested();
+ if (err)
+ goto out;
+
+ err = test_sysctl_run_register_mount_point();
+
+out:
+ return err;
+}
+module_init(test_sysctl_init);
+
+static void __exit test_sysctl_exit(void)
+{
+ kfree(test_data.bitmap_0001);
+ if (sysctl_test_headers.test_h_setup_node)
+ unregister_sysctl_table(sysctl_test_headers.test_h_setup_node);
+ if (sysctl_test_headers.test_h_mnt)
+ unregister_sysctl_table(sysctl_test_headers.test_h_mnt);
+ if (sysctl_test_headers.test_h_mnterror)
+ unregister_sysctl_table(sysctl_test_headers.test_h_mnterror);
+}
+
+module_exit(test_sysctl_exit);
+
+MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
+MODULE_LICENSE("GPL");