16cad1ecdSLuis Chamberlain // SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1 29308f2f9SLuis R. Rodriguez /* 39308f2f9SLuis R. Rodriguez * proc sysctl test driver 49308f2f9SLuis R. Rodriguez * 59308f2f9SLuis R. Rodriguez * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> 69308f2f9SLuis R. Rodriguez */ 79308f2f9SLuis R. Rodriguez 89308f2f9SLuis R. Rodriguez /* 92d046981SRandy Dunlap * This module provides an interface to the proc sysctl interfaces. This 109308f2f9SLuis R. Rodriguez * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the 119308f2f9SLuis R. Rodriguez * system unless explicitly requested by name. You can also build this driver 129308f2f9SLuis R. Rodriguez * into your kernel. 139308f2f9SLuis R. Rodriguez */ 149308f2f9SLuis R. Rodriguez 159308f2f9SLuis R. Rodriguez #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 169308f2f9SLuis R. Rodriguez 179308f2f9SLuis R. Rodriguez #include <linux/init.h> 189308f2f9SLuis R. Rodriguez #include <linux/list.h> 199308f2f9SLuis R. Rodriguez #include <linux/module.h> 209308f2f9SLuis R. Rodriguez #include <linux/printk.h> 219308f2f9SLuis R. Rodriguez #include <linux/fs.h> 229308f2f9SLuis R. Rodriguez #include <linux/miscdevice.h> 239308f2f9SLuis R. Rodriguez #include <linux/slab.h> 249308f2f9SLuis R. Rodriguez #include <linux/uaccess.h> 259308f2f9SLuis R. Rodriguez #include <linux/async.h> 269308f2f9SLuis R. Rodriguez #include <linux/delay.h> 279308f2f9SLuis R. Rodriguez #include <linux/vmalloc.h> 289308f2f9SLuis R. Rodriguez 299308f2f9SLuis R. Rodriguez static int i_zero; 309308f2f9SLuis R. Rodriguez static int i_one_hundred = 100; 3157b19468STonghao Zhang static int match_int_ok = 1; 329308f2f9SLuis R. Rodriguez 33*f2e7a626SJoel Granados 34*f2e7a626SJoel Granados static struct { 35*f2e7a626SJoel Granados struct ctl_table_header *test_h_setup_node; 36*f2e7a626SJoel Granados struct ctl_table_header *test_h_mnt; 37*f2e7a626SJoel Granados struct ctl_table_header *test_h_mnterror; 38*f2e7a626SJoel Granados } sysctl_test_headers; 39*f2e7a626SJoel Granados 409308f2f9SLuis R. Rodriguez struct test_sysctl_data { 419308f2f9SLuis R. Rodriguez int int_0001; 42eb965edaSLuis R. Rodriguez int int_0002; 437c43a657SLuis R. Rodriguez int int_0003[4]; 44eb965edaSLuis R. Rodriguez 454f2f682dSVlastimil Babka int boot_int; 464f2f682dSVlastimil Babka 472920fad3SLuis R. Rodriguez unsigned int uint_0001; 482920fad3SLuis R. Rodriguez 499308f2f9SLuis R. Rodriguez char string_0001[65]; 502ea622b8SEric Sandeen 512ea622b8SEric Sandeen #define SYSCTL_TEST_BITMAP_SIZE 65536 522ea622b8SEric Sandeen unsigned long *bitmap_0001; 539308f2f9SLuis R. Rodriguez }; 549308f2f9SLuis R. Rodriguez 559308f2f9SLuis R. Rodriguez static struct test_sysctl_data test_data = { 569308f2f9SLuis R. Rodriguez .int_0001 = 60, 57eb965edaSLuis R. Rodriguez .int_0002 = 1, 58eb965edaSLuis R. Rodriguez 597c43a657SLuis R. Rodriguez .int_0003[0] = 0, 607c43a657SLuis R. Rodriguez .int_0003[1] = 1, 617c43a657SLuis R. Rodriguez .int_0003[2] = 2, 627c43a657SLuis R. Rodriguez .int_0003[3] = 3, 637c43a657SLuis R. Rodriguez 644f2f682dSVlastimil Babka .boot_int = 0, 654f2f682dSVlastimil Babka 662920fad3SLuis R. Rodriguez .uint_0001 = 314, 672920fad3SLuis R. Rodriguez 689308f2f9SLuis R. Rodriguez .string_0001 = "(none)", 699308f2f9SLuis R. Rodriguez }; 709308f2f9SLuis R. Rodriguez 719308f2f9SLuis R. Rodriguez /* These are all under /proc/sys/debug/test_sysctl/ */ 729308f2f9SLuis R. Rodriguez static struct ctl_table test_table[] = { 739308f2f9SLuis R. Rodriguez { 749308f2f9SLuis R. Rodriguez .procname = "int_0001", 759308f2f9SLuis R. Rodriguez .data = &test_data.int_0001, 769308f2f9SLuis R. Rodriguez .maxlen = sizeof(int), 779308f2f9SLuis R. Rodriguez .mode = 0644, 789308f2f9SLuis R. Rodriguez .proc_handler = proc_dointvec_minmax, 799308f2f9SLuis R. Rodriguez .extra1 = &i_zero, 809308f2f9SLuis R. Rodriguez .extra2 = &i_one_hundred, 819308f2f9SLuis R. Rodriguez }, 829308f2f9SLuis R. Rodriguez { 83eb965edaSLuis R. Rodriguez .procname = "int_0002", 84eb965edaSLuis R. Rodriguez .data = &test_data.int_0002, 85eb965edaSLuis R. Rodriguez .maxlen = sizeof(int), 86eb965edaSLuis R. Rodriguez .mode = 0644, 87eb965edaSLuis R. Rodriguez .proc_handler = proc_dointvec, 88eb965edaSLuis R. Rodriguez }, 89eb965edaSLuis R. Rodriguez { 907c43a657SLuis R. Rodriguez .procname = "int_0003", 917c43a657SLuis R. Rodriguez .data = &test_data.int_0003, 927c43a657SLuis R. Rodriguez .maxlen = sizeof(test_data.int_0003), 937c43a657SLuis R. Rodriguez .mode = 0644, 947c43a657SLuis R. Rodriguez .proc_handler = proc_dointvec, 957c43a657SLuis R. Rodriguez }, 967c43a657SLuis R. Rodriguez { 9757b19468STonghao Zhang .procname = "match_int", 9857b19468STonghao Zhang .data = &match_int_ok, 9957b19468STonghao Zhang .maxlen = sizeof(match_int_ok), 10057b19468STonghao Zhang .mode = 0444, 10157b19468STonghao Zhang .proc_handler = proc_dointvec, 10257b19468STonghao Zhang }, 10357b19468STonghao Zhang { 1044f2f682dSVlastimil Babka .procname = "boot_int", 1054f2f682dSVlastimil Babka .data = &test_data.boot_int, 1064f2f682dSVlastimil Babka .maxlen = sizeof(test_data.boot_int), 1074f2f682dSVlastimil Babka .mode = 0644, 1084f2f682dSVlastimil Babka .proc_handler = proc_dointvec, 1094f2f682dSVlastimil Babka .extra1 = SYSCTL_ZERO, 1104f2f682dSVlastimil Babka .extra2 = SYSCTL_ONE, 1114f2f682dSVlastimil Babka }, 1124f2f682dSVlastimil Babka { 1132920fad3SLuis R. Rodriguez .procname = "uint_0001", 1142920fad3SLuis R. Rodriguez .data = &test_data.uint_0001, 1152920fad3SLuis R. Rodriguez .maxlen = sizeof(unsigned int), 1162920fad3SLuis R. Rodriguez .mode = 0644, 1172920fad3SLuis R. Rodriguez .proc_handler = proc_douintvec, 1182920fad3SLuis R. Rodriguez }, 1192920fad3SLuis R. Rodriguez { 1209308f2f9SLuis R. Rodriguez .procname = "string_0001", 1219308f2f9SLuis R. Rodriguez .data = &test_data.string_0001, 1229308f2f9SLuis R. Rodriguez .maxlen = sizeof(test_data.string_0001), 1239308f2f9SLuis R. Rodriguez .mode = 0644, 1249308f2f9SLuis R. Rodriguez .proc_handler = proc_dostring, 1259308f2f9SLuis R. Rodriguez }, 1262ea622b8SEric Sandeen { 1272ea622b8SEric Sandeen .procname = "bitmap_0001", 1282ea622b8SEric Sandeen .data = &test_data.bitmap_0001, 1292ea622b8SEric Sandeen .maxlen = SYSCTL_TEST_BITMAP_SIZE, 1302ea622b8SEric Sandeen .mode = 0644, 1312ea622b8SEric Sandeen .proc_handler = proc_do_large_bitmap, 1322ea622b8SEric Sandeen }, 1339308f2f9SLuis R. Rodriguez { } 1349308f2f9SLuis R. Rodriguez }; 1359308f2f9SLuis R. Rodriguez 136e009bd5eSJoel Granados static void test_sysctl_calc_match_int_ok(void) 1379308f2f9SLuis R. Rodriguez { 13857b19468STonghao Zhang int i; 13957b19468STonghao Zhang 14057b19468STonghao Zhang struct { 14157b19468STonghao Zhang int defined; 14257b19468STonghao Zhang int wanted; 14357b19468STonghao Zhang } match_int[] = { 14457b19468STonghao Zhang {.defined = *(int *)SYSCTL_ZERO, .wanted = 0}, 14557b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE, .wanted = 1}, 14657b19468STonghao Zhang {.defined = *(int *)SYSCTL_TWO, .wanted = 2}, 14757b19468STonghao Zhang {.defined = *(int *)SYSCTL_THREE, .wanted = 3}, 14857b19468STonghao Zhang {.defined = *(int *)SYSCTL_FOUR, .wanted = 4}, 14957b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100}, 15057b19468STonghao Zhang {.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200}, 15157b19468STonghao Zhang {.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000}, 15257b19468STonghao Zhang {.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000}, 15357b19468STonghao Zhang {.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX}, 15457b19468STonghao Zhang {.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535}, 15557b19468STonghao Zhang {.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1}, 15657b19468STonghao Zhang }; 15757b19468STonghao Zhang 15857b19468STonghao Zhang for (i = 0; i < ARRAY_SIZE(match_int); i++) 15957b19468STonghao Zhang if (match_int[i].defined != match_int[i].wanted) 16057b19468STonghao Zhang match_int_ok = 0; 161e009bd5eSJoel Granados } 16257b19468STonghao Zhang 163e009bd5eSJoel Granados static int test_sysctl_setup_node_tests(void) 164e009bd5eSJoel Granados { 165e009bd5eSJoel Granados test_sysctl_calc_match_int_ok(); 1662ea622b8SEric Sandeen test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL); 1672ea622b8SEric Sandeen if (!test_data.bitmap_0001) 1689308f2f9SLuis R. Rodriguez return -ENOMEM; 169*f2e7a626SJoel Granados sysctl_test_headers.test_h_setup_node = register_sysctl("debug/test_sysctl", test_table); 170*f2e7a626SJoel Granados if (!sysctl_test_headers.test_h_setup_node) { 1712ea622b8SEric Sandeen kfree(test_data.bitmap_0001); 1722ea622b8SEric Sandeen return -ENOMEM; 1732ea622b8SEric Sandeen } 174e009bd5eSJoel Granados 1759308f2f9SLuis R. Rodriguez return 0; 1769308f2f9SLuis R. Rodriguez } 177e009bd5eSJoel Granados 17835576438SJoel Granados /* Used to test that unregister actually removes the directory */ 17935576438SJoel Granados static struct ctl_table test_table_unregister[] = { 18035576438SJoel Granados { 18135576438SJoel Granados .procname = "unregister_error", 18235576438SJoel Granados .data = &test_data.int_0001, 18335576438SJoel Granados .maxlen = sizeof(int), 18435576438SJoel Granados .mode = 0644, 18535576438SJoel Granados .proc_handler = proc_dointvec_minmax, 18635576438SJoel Granados }, 18735576438SJoel Granados {} 18835576438SJoel Granados }; 18935576438SJoel Granados 19035576438SJoel Granados static int test_sysctl_run_unregister_nested(void) 19135576438SJoel Granados { 19235576438SJoel Granados struct ctl_table_header *unregister; 19335576438SJoel Granados 19435576438SJoel Granados unregister = register_sysctl("debug/test_sysctl/unregister_error", 19535576438SJoel Granados test_table_unregister); 19635576438SJoel Granados if (!unregister) 19735576438SJoel Granados return -ENOMEM; 19835576438SJoel Granados 19935576438SJoel Granados unregister_sysctl_table(unregister); 20035576438SJoel Granados return 0; 20135576438SJoel Granados } 20235576438SJoel Granados 203*f2e7a626SJoel Granados static int test_sysctl_run_register_mount_point(void) 204*f2e7a626SJoel Granados { 205*f2e7a626SJoel Granados sysctl_test_headers.test_h_mnt 206*f2e7a626SJoel Granados = register_sysctl_mount_point("debug/test_sysctl/mnt"); 207*f2e7a626SJoel Granados if (!sysctl_test_headers.test_h_mnt) 208*f2e7a626SJoel Granados return -ENOMEM; 209*f2e7a626SJoel Granados 210*f2e7a626SJoel Granados sysctl_test_headers.test_h_mnterror 211*f2e7a626SJoel Granados = register_sysctl("debug/test_sysctl/mnt/mnt_error", 212*f2e7a626SJoel Granados test_table_unregister); 213*f2e7a626SJoel Granados /* 214*f2e7a626SJoel Granados * Don't check the result.: 215*f2e7a626SJoel Granados * If it fails (expected behavior), return 0. 216*f2e7a626SJoel Granados * If successful (missbehavior of register mount point), we want to see 217*f2e7a626SJoel Granados * mnt_error when we run the sysctl test script 218*f2e7a626SJoel Granados */ 219*f2e7a626SJoel Granados 220*f2e7a626SJoel Granados return 0; 221*f2e7a626SJoel Granados } 222*f2e7a626SJoel Granados 223e009bd5eSJoel Granados static int __init test_sysctl_init(void) 224e009bd5eSJoel Granados { 225e009bd5eSJoel Granados int err; 226e009bd5eSJoel Granados 227e009bd5eSJoel Granados err = test_sysctl_setup_node_tests(); 22835576438SJoel Granados if (err) 22935576438SJoel Granados goto out; 230e009bd5eSJoel Granados 23135576438SJoel Granados err = test_sysctl_run_unregister_nested(); 232*f2e7a626SJoel Granados if (err) 233*f2e7a626SJoel Granados goto out; 234*f2e7a626SJoel Granados 235*f2e7a626SJoel Granados err = test_sysctl_run_register_mount_point(); 23635576438SJoel Granados 23735576438SJoel Granados out: 238e009bd5eSJoel Granados return err; 239e009bd5eSJoel Granados } 2402f56f845SMasami Hiramatsu module_init(test_sysctl_init); 2419308f2f9SLuis R. Rodriguez 2429308f2f9SLuis R. Rodriguez static void __exit test_sysctl_exit(void) 2439308f2f9SLuis R. Rodriguez { 2442ea622b8SEric Sandeen kfree(test_data.bitmap_0001); 245*f2e7a626SJoel Granados if (sysctl_test_headers.test_h_setup_node) 246*f2e7a626SJoel Granados unregister_sysctl_table(sysctl_test_headers.test_h_setup_node); 247*f2e7a626SJoel Granados if (sysctl_test_headers.test_h_mnt) 248*f2e7a626SJoel Granados unregister_sysctl_table(sysctl_test_headers.test_h_mnt); 249*f2e7a626SJoel Granados if (sysctl_test_headers.test_h_mnterror) 250*f2e7a626SJoel Granados unregister_sysctl_table(sysctl_test_headers.test_h_mnterror); 2519308f2f9SLuis R. Rodriguez } 2529308f2f9SLuis R. Rodriguez 2539308f2f9SLuis R. Rodriguez module_exit(test_sysctl_exit); 2549308f2f9SLuis R. Rodriguez 2559308f2f9SLuis R. Rodriguez MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); 2569308f2f9SLuis R. Rodriguez MODULE_LICENSE("GPL"); 257