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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/* * 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;
enum { TEST_H_SETUP_NODE, TEST_H_MNT, TEST_H_MNTERROR, TEST_H_EMPTY_ADD, TEST_H_EMPTY, TEST_H_U8, TEST_H_SIZE /* Always at the end */};
static struct ctl_table_header *ctl_headers[TEST_H_SIZE] = {};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 const 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; ctl_headers[TEST_H_SETUP_NODE] = register_sysctl("debug/test_sysctl", test_table); if (!ctl_headers[TEST_H_SETUP_NODE]) { kfree(test_data.bitmap_0001); return -ENOMEM; }
return 0;}
/* Used to test that unregister actually removes the directory */static const 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){ ctl_headers[TEST_H_MNT] = register_sysctl_mount_point("debug/test_sysctl/mnt"); if (!ctl_headers[TEST_H_MNT]) return -ENOMEM;
ctl_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 const struct ctl_table test_table_empty[] = { };
static int test_sysctl_run_register_empty(void){ /* Tets that an empty dir can be created */ ctl_headers[TEST_H_EMPTY_ADD] = register_sysctl("debug/test_sysctl/empty_add", test_table_empty); if (!ctl_headers[TEST_H_EMPTY_ADD]) return -ENOMEM;
/* Test that register on top of an empty dir works */ ctl_headers[TEST_H_EMPTY] = register_sysctl("debug/test_sysctl/empty_add/empty", test_table_empty); if (!ctl_headers[TEST_H_EMPTY]) return -ENOMEM;
return 0;}
static const struct ctl_table table_u8_over[] = { { .procname = "u8_over", .data = &test_data.uint_0001, .maxlen = sizeof(u8), .mode = 0644, .proc_handler = proc_dou8vec_minmax, .extra1 = SYSCTL_FOUR, .extra2 = SYSCTL_ONE_THOUSAND, },};
static const struct ctl_table table_u8_under[] = { { .procname = "u8_under", .data = &test_data.uint_0001, .maxlen = sizeof(u8), .mode = 0644, .proc_handler = proc_dou8vec_minmax, .extra1 = SYSCTL_NEG_ONE, .extra2 = SYSCTL_ONE_HUNDRED, },};
static const struct ctl_table table_u8_valid[] = { { .procname = "u8_valid", .data = &test_data.uint_0001, .maxlen = sizeof(u8), .mode = 0644, .proc_handler = proc_dou8vec_minmax, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_TWO_HUNDRED, },};
static int test_sysctl_register_u8_extra(void){ /* should fail because it's over */ ctl_headers[TEST_H_U8] = register_sysctl("debug/test_sysctl", table_u8_over); if (ctl_headers[TEST_H_U8]) return -ENOMEM;
/* should fail because it's under */ ctl_headers[TEST_H_U8] = register_sysctl("debug/test_sysctl", table_u8_under); if (ctl_headers[TEST_H_U8]) return -ENOMEM;
/* should not fail because it's valid */ ctl_headers[TEST_H_U8] = register_sysctl("debug/test_sysctl", table_u8_valid); if (!ctl_headers[TEST_H_U8]) return -ENOMEM;
return 0;}
static int __init test_sysctl_init(void){ int err = 0;
int (*func_array[])(void) = { test_sysctl_setup_node_tests, test_sysctl_run_unregister_nested, test_sysctl_run_register_mount_point, test_sysctl_run_register_empty, test_sysctl_register_u8_extra };
for (int i = 0; !err && i < ARRAY_SIZE(func_array); i++) err = func_array[i]();
return err;}module_init(test_sysctl_init);
static void __exit test_sysctl_exit(void){ kfree(test_data.bitmap_0001); for (int i = 0; i < TEST_H_SIZE; i++) { if (ctl_headers[i]) unregister_sysctl_table(ctl_headers[i]); }}
module_exit(test_sysctl_exit);
MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");MODULE_DESCRIPTION("proc sysctl test driver");MODULE_LICENSE("GPL");