284 lines
6.8 KiB
C
284 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1
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/*
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* proc sysctl test driver
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*
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* Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
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*/
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/*
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* This module provides an interface to the proc sysctl interfaces. This
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* driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
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* system unless explicitly requested by name. You can also build this driver
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* into your kernel.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/async.h>
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#include <linux/delay.h>
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#include <linux/vmalloc.h>
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static int i_zero;
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static int i_one_hundred = 100;
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static int match_int_ok = 1;
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static struct {
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struct ctl_table_header *test_h_setup_node;
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struct ctl_table_header *test_h_mnt;
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struct ctl_table_header *test_h_mnterror;
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struct ctl_table_header *empty_add;
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struct ctl_table_header *empty;
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} sysctl_test_headers;
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struct test_sysctl_data {
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int int_0001;
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int int_0002;
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int int_0003[4];
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int boot_int;
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unsigned int uint_0001;
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char string_0001[65];
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#define SYSCTL_TEST_BITMAP_SIZE 65536
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unsigned long *bitmap_0001;
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};
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static struct test_sysctl_data test_data = {
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.int_0001 = 60,
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.int_0002 = 1,
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.int_0003[0] = 0,
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.int_0003[1] = 1,
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.int_0003[2] = 2,
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.int_0003[3] = 3,
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.boot_int = 0,
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.uint_0001 = 314,
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.string_0001 = "(none)",
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};
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/* These are all under /proc/sys/debug/test_sysctl/ */
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static struct ctl_table test_table[] = {
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{
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.procname = "int_0001",
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.data = &test_data.int_0001,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &i_zero,
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.extra2 = &i_one_hundred,
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},
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{
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.procname = "int_0002",
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.data = &test_data.int_0002,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "int_0003",
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.data = &test_data.int_0003,
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.maxlen = sizeof(test_data.int_0003),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "match_int",
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.data = &match_int_ok,
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.maxlen = sizeof(match_int_ok),
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.mode = 0444,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "boot_int",
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.data = &test_data.boot_int,
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.maxlen = sizeof(test_data.boot_int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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{
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.procname = "uint_0001",
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.data = &test_data.uint_0001,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_douintvec,
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},
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{
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.procname = "string_0001",
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.data = &test_data.string_0001,
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.maxlen = sizeof(test_data.string_0001),
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.mode = 0644,
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.proc_handler = proc_dostring,
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},
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{
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.procname = "bitmap_0001",
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.data = &test_data.bitmap_0001,
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.maxlen = SYSCTL_TEST_BITMAP_SIZE,
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.mode = 0644,
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.proc_handler = proc_do_large_bitmap,
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},
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};
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static void test_sysctl_calc_match_int_ok(void)
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{
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int i;
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struct {
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int defined;
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int wanted;
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} match_int[] = {
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{.defined = *(int *)SYSCTL_ZERO, .wanted = 0},
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{.defined = *(int *)SYSCTL_ONE, .wanted = 1},
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{.defined = *(int *)SYSCTL_TWO, .wanted = 2},
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{.defined = *(int *)SYSCTL_THREE, .wanted = 3},
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{.defined = *(int *)SYSCTL_FOUR, .wanted = 4},
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{.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100},
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{.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200},
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{.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000},
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{.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000},
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{.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX},
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{.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535},
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{.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1},
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};
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for (i = 0; i < ARRAY_SIZE(match_int); i++)
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if (match_int[i].defined != match_int[i].wanted)
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match_int_ok = 0;
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}
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static int test_sysctl_setup_node_tests(void)
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{
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test_sysctl_calc_match_int_ok();
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test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
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if (!test_data.bitmap_0001)
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return -ENOMEM;
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sysctl_test_headers.test_h_setup_node = register_sysctl("debug/test_sysctl", test_table);
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if (!sysctl_test_headers.test_h_setup_node) {
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kfree(test_data.bitmap_0001);
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return -ENOMEM;
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}
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return 0;
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}
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/* Used to test that unregister actually removes the directory */
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static struct ctl_table test_table_unregister[] = {
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{
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.procname = "unregister_error",
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.data = &test_data.int_0001,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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},
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};
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static int test_sysctl_run_unregister_nested(void)
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{
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struct ctl_table_header *unregister;
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unregister = register_sysctl("debug/test_sysctl/unregister_error",
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test_table_unregister);
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if (!unregister)
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return -ENOMEM;
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unregister_sysctl_table(unregister);
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return 0;
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}
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static int test_sysctl_run_register_mount_point(void)
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{
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sysctl_test_headers.test_h_mnt
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= register_sysctl_mount_point("debug/test_sysctl/mnt");
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if (!sysctl_test_headers.test_h_mnt)
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return -ENOMEM;
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sysctl_test_headers.test_h_mnterror
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= register_sysctl("debug/test_sysctl/mnt/mnt_error",
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test_table_unregister);
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/*
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* Don't check the result.:
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* If it fails (expected behavior), return 0.
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* If successful (missbehavior of register mount point), we want to see
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* mnt_error when we run the sysctl test script
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*/
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return 0;
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}
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static struct ctl_table test_table_empty[] = { };
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static int test_sysctl_run_register_empty(void)
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{
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/* Tets that an empty dir can be created */
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sysctl_test_headers.empty_add
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= register_sysctl("debug/test_sysctl/empty_add", test_table_empty);
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if (!sysctl_test_headers.empty_add)
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return -ENOMEM;
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/* Test that register on top of an empty dir works */
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sysctl_test_headers.empty
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= register_sysctl("debug/test_sysctl/empty_add/empty", test_table_empty);
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if (!sysctl_test_headers.empty)
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return -ENOMEM;
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return 0;
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}
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static int __init test_sysctl_init(void)
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{
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int err;
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err = test_sysctl_setup_node_tests();
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if (err)
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goto out;
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err = test_sysctl_run_unregister_nested();
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if (err)
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goto out;
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err = test_sysctl_run_register_mount_point();
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if (err)
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goto out;
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err = test_sysctl_run_register_empty();
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out:
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return err;
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}
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module_init(test_sysctl_init);
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static void __exit test_sysctl_exit(void)
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{
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kfree(test_data.bitmap_0001);
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if (sysctl_test_headers.test_h_setup_node)
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unregister_sysctl_table(sysctl_test_headers.test_h_setup_node);
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if (sysctl_test_headers.test_h_mnt)
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unregister_sysctl_table(sysctl_test_headers.test_h_mnt);
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if (sysctl_test_headers.test_h_mnterror)
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unregister_sysctl_table(sysctl_test_headers.test_h_mnterror);
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if (sysctl_test_headers.empty)
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unregister_sysctl_table(sysctl_test_headers.empty);
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if (sysctl_test_headers.empty_add)
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unregister_sysctl_table(sysctl_test_headers.empty_add);
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}
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module_exit(test_sysctl_exit);
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MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
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MODULE_LICENSE("GPL");
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