mirror of
https://github.com/torvalds/linux.git
synced 2025-08-15 06:01:56 +02:00
23b8bacf15
As more tests are added, the exit function gets longer than it should be. Condense the un-register calls into a for loop to make it easier to add/remove tests. Reviewed-by: Kees Cook <kees@kernel.org> Signed-off-by: Joel Granados <joel.granados@kernel.org>
335 lines
7.8 KiB
C
335 lines
7.8 KiB
C
// 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;
|
|
|
|
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");
|