lkdtm: Relocate code to subdirectory

The LKDTM modules keep expanding, and it's getting weird to have each file
get a prefix. Instead, move to a subdirectory for cleaner handling.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 505 deletions

diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c
deleted file mode 100644
index 2154d1bfd18b..000000000000
--- a/drivers/misc/lkdtm_core.c
+++ /dev/null
@@ -1,505 +0,0 @@
-/*
- * Linux Kernel Dump Test Module for testing kernel crashes conditions:
- * induces system failures at predefined crashpoints and under predefined
- * operational conditions in order to evaluate the reliability of kernel
- * sanity checking and crash dumps obtained using different dumping
- * solutions.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2006
- *
- * Author: Ankita Garg <ankita@in.ibm.com>
- *
- * It is adapted from the Linux Kernel Dump Test Tool by
- * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
- *
- * Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net>
- *
- * See Documentation/fault-injection/provoke-crashes.txt for instructions
- */
-#include "lkdtm.h"
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/buffer_head.h>
-#include <linux/kprobes.h>
-#include <linux/list.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/hrtimer.h>
-#include <linux/slab.h>
-#include <scsi/scsi_cmnd.h>
-#include <linux/debugfs.h>
-
-#ifdef CONFIG_IDE
-#include <linux/ide.h>
-#endif
-
-#define DEFAULT_COUNT 10
-
-static int lkdtm_debugfs_open(struct inode *inode, struct file *file);
-static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
-		size_t count, loff_t *off);
-static ssize_t direct_entry(struct file *f, const char __user *user_buf,
-			    size_t count, loff_t *off);
-
-#ifdef CONFIG_KPROBES
-static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs);
-static ssize_t lkdtm_debugfs_entry(struct file *f,
-				   const char __user *user_buf,
-				   size_t count, loff_t *off);
-# define CRASHPOINT_KPROBE(_symbol)				\
-		.kprobe = {					\
-			.symbol_name = (_symbol),		\
-			.pre_handler = lkdtm_kprobe_handler,	\
-		},
-# define CRASHPOINT_WRITE(_symbol)				\
-		(_symbol) ? lkdtm_debugfs_entry : direct_entry
-#else
-# define CRASHPOINT_KPROBE(_symbol)
-# define CRASHPOINT_WRITE(_symbol)		direct_entry
-#endif
-
-/* Crash points */
-struct crashpoint {
-	const char *name;
-	const struct file_operations fops;
-	struct kprobe kprobe;
-};
-
-#define CRASHPOINT(_name, _symbol)				\
-	{							\
-		.name = _name,					\
-		.fops = {					\
-			.read	= lkdtm_debugfs_read,		\
-			.llseek	= generic_file_llseek,		\
-			.open	= lkdtm_debugfs_open,		\
-			.write	= CRASHPOINT_WRITE(_symbol)	\
-		},						\
-		CRASHPOINT_KPROBE(_symbol)			\
-	}
-
-/* Define the possible places where we can trigger a crash point. */
-static struct crashpoint crashpoints[] = {
-	CRASHPOINT("DIRECT",		 NULL),
-#ifdef CONFIG_KPROBES
-	CRASHPOINT("INT_HARDWARE_ENTRY", "do_IRQ"),
-	CRASHPOINT("INT_HW_IRQ_EN",	 "handle_irq_event"),
-	CRASHPOINT("INT_TASKLET_ENTRY",	 "tasklet_action"),
-	CRASHPOINT("FS_DEVRW",		 "ll_rw_block"),
-	CRASHPOINT("MEM_SWAPOUT",	 "shrink_inactive_list"),
-	CRASHPOINT("TIMERADD",		 "hrtimer_start"),
-	CRASHPOINT("SCSI_DISPATCH_CMD",	 "scsi_dispatch_cmd"),
-# ifdef CONFIG_IDE
-	CRASHPOINT("IDE_CORE_CP",	 "generic_ide_ioctl"),
-# endif
-#endif
-};
-
-
-/* Crash types. */
-struct crashtype {
-	const char *name;
-	void (*func)(void);
-};
-
-#define CRASHTYPE(_name)			\
-	{					\
-		.name = __stringify(_name),	\
-		.func = lkdtm_ ## _name,	\
-	}
-
-/* Define the possible types of crashes that can be triggered. */
-static const struct crashtype crashtypes[] = {
-	CRASHTYPE(PANIC),
-	CRASHTYPE(BUG),
-	CRASHTYPE(WARNING),
-	CRASHTYPE(EXCEPTION),
-	CRASHTYPE(LOOP),
-	CRASHTYPE(OVERFLOW),
-	CRASHTYPE(CORRUPT_LIST_ADD),
-	CRASHTYPE(CORRUPT_LIST_DEL),
-	CRASHTYPE(CORRUPT_USER_DS),
-	CRASHTYPE(CORRUPT_STACK),
-	CRASHTYPE(CORRUPT_STACK_STRONG),
-	CRASHTYPE(STACK_GUARD_PAGE_LEADING),
-	CRASHTYPE(STACK_GUARD_PAGE_TRAILING),
-	CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE),
-	CRASHTYPE(OVERWRITE_ALLOCATION),
-	CRASHTYPE(WRITE_AFTER_FREE),
-	CRASHTYPE(READ_AFTER_FREE),
-	CRASHTYPE(WRITE_BUDDY_AFTER_FREE),
-	CRASHTYPE(READ_BUDDY_AFTER_FREE),
-	CRASHTYPE(SOFTLOCKUP),
-	CRASHTYPE(HARDLOCKUP),
-	CRASHTYPE(SPINLOCKUP),
-	CRASHTYPE(HUNG_TASK),
-	CRASHTYPE(EXEC_DATA),
-	CRASHTYPE(EXEC_STACK),
-	CRASHTYPE(EXEC_KMALLOC),
-	CRASHTYPE(EXEC_VMALLOC),
-	CRASHTYPE(EXEC_RODATA),
-	CRASHTYPE(EXEC_USERSPACE),
-	CRASHTYPE(ACCESS_USERSPACE),
-	CRASHTYPE(WRITE_RO),
-	CRASHTYPE(WRITE_RO_AFTER_INIT),
-	CRASHTYPE(WRITE_KERN),
-	CRASHTYPE(REFCOUNT_INC_OVERFLOW),
-	CRASHTYPE(REFCOUNT_ADD_OVERFLOW),
-	CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW),
-	CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW),
-	CRASHTYPE(REFCOUNT_DEC_ZERO),
-	CRASHTYPE(REFCOUNT_DEC_NEGATIVE),
-	CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE),
-	CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE),
-	CRASHTYPE(REFCOUNT_INC_ZERO),
-	CRASHTYPE(REFCOUNT_ADD_ZERO),
-	CRASHTYPE(REFCOUNT_INC_SATURATED),
-	CRASHTYPE(REFCOUNT_DEC_SATURATED),
-	CRASHTYPE(REFCOUNT_ADD_SATURATED),
-	CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED),
-	CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED),
-	CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED),
-	CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED),
-	CRASHTYPE(REFCOUNT_TIMING),
-	CRASHTYPE(ATOMIC_TIMING),
-	CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
-	CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
-	CRASHTYPE(USERCOPY_HEAP_WHITELIST_TO),
-	CRASHTYPE(USERCOPY_HEAP_WHITELIST_FROM),
-	CRASHTYPE(USERCOPY_STACK_FRAME_TO),
-	CRASHTYPE(USERCOPY_STACK_FRAME_FROM),
-	CRASHTYPE(USERCOPY_STACK_BEYOND),
-	CRASHTYPE(USERCOPY_KERNEL),
-};
-
-
-/* Global kprobe entry and crashtype. */
-static struct kprobe *lkdtm_kprobe;
-static struct crashpoint *lkdtm_crashpoint;
-static const struct crashtype *lkdtm_crashtype;
-
-/* Module parameters */
-static int recur_count = -1;
-module_param(recur_count, int, 0644);
-MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test");
-
-static char* cpoint_name;
-module_param(cpoint_name, charp, 0444);
-MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
-
-static char* cpoint_type;
-module_param(cpoint_type, charp, 0444);
-MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
-				"hitting the crash point");
-
-static int cpoint_count = DEFAULT_COUNT;
-module_param(cpoint_count, int, 0644);
-MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
-				"crash point is to be hit to trigger action");
-
-
-/* Return the crashtype number or NULL if the name is invalid */
-static const struct crashtype *find_crashtype(const char *name)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
-		if (!strcmp(name, crashtypes[i].name))
-			return &crashtypes[i];
-	}
-
-	return NULL;
-}
-
-/*
- * This is forced noinline just so it distinctly shows up in the stackdump
- * which makes validation of expected lkdtm crashes easier.
- */
-static noinline void lkdtm_do_action(const struct crashtype *crashtype)
-{
-	if (WARN_ON(!crashtype || !crashtype->func))
-		return;
-	crashtype->func();
-}
-
-static int lkdtm_register_cpoint(struct crashpoint *crashpoint,
-				 const struct crashtype *crashtype)
-{
-	int ret;
-
-	/* If this doesn't have a symbol, just call immediately. */
-	if (!crashpoint->kprobe.symbol_name) {
-		lkdtm_do_action(crashtype);
-		return 0;
-	}
-
-	if (lkdtm_kprobe != NULL)
-		unregister_kprobe(lkdtm_kprobe);
-
-	lkdtm_crashpoint = crashpoint;
-	lkdtm_crashtype = crashtype;
-	lkdtm_kprobe = &crashpoint->kprobe;
-	ret = register_kprobe(lkdtm_kprobe);
-	if (ret < 0) {
-		pr_info("Couldn't register kprobe %s\n",
-			crashpoint->kprobe.symbol_name);
-		lkdtm_kprobe = NULL;
-		lkdtm_crashpoint = NULL;
-		lkdtm_crashtype = NULL;
-	}
-
-	return ret;
-}
-
-#ifdef CONFIG_KPROBES
-/* Global crash counter and spinlock. */
-static int crash_count = DEFAULT_COUNT;
-static DEFINE_SPINLOCK(crash_count_lock);
-
-/* Called by kprobe entry points. */
-static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs)
-{
-	unsigned long flags;
-	bool do_it = false;
-
-	if (WARN_ON(!lkdtm_crashpoint || !lkdtm_crashtype))
-		return 0;
-
-	spin_lock_irqsave(&crash_count_lock, flags);
-	crash_count--;
-	pr_info("Crash point %s of type %s hit, trigger in %d rounds\n",
-		lkdtm_crashpoint->name, lkdtm_crashtype->name, crash_count);
-
-	if (crash_count == 0) {
-		do_it = true;
-		crash_count = cpoint_count;
-	}
-	spin_unlock_irqrestore(&crash_count_lock, flags);
-
-	if (do_it)
-		lkdtm_do_action(lkdtm_crashtype);
-
-	return 0;
-}
-
-static ssize_t lkdtm_debugfs_entry(struct file *f,
-				   const char __user *user_buf,
-				   size_t count, loff_t *off)
-{
-	struct crashpoint *crashpoint = file_inode(f)->i_private;
-	const struct crashtype *crashtype = NULL;
-	char *buf;
-	int err;
-
-	if (count >= PAGE_SIZE)
-		return -EINVAL;
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	if (copy_from_user(buf, user_buf, count)) {
-		free_page((unsigned long) buf);
-		return -EFAULT;
-	}
-	/* NULL-terminate and remove enter */
-	buf[count] = '\0';
-	strim(buf);
-
-	crashtype = find_crashtype(buf);
-	free_page((unsigned long)buf);
-
-	if (!crashtype)
-		return -EINVAL;
-
-	err = lkdtm_register_cpoint(crashpoint, crashtype);
-	if (err < 0)
-		return err;
-
-	*off += count;
-
-	return count;
-}
-#endif
-
-/* Generic read callback that just prints out the available crash types */
-static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
-		size_t count, loff_t *off)
-{
-	char *buf;
-	int i, n, out;
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (buf == NULL)
-		return -ENOMEM;
-
-	n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
-	for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
-		n += snprintf(buf + n, PAGE_SIZE - n, "%s\n",
-			      crashtypes[i].name);
-	}
-	buf[n] = '\0';
-
-	out = simple_read_from_buffer(user_buf, count, off,
-				      buf, n);
-	free_page((unsigned long) buf);
-
-	return out;
-}
-
-static int lkdtm_debugfs_open(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-/* Special entry to just crash directly. Available without KPROBEs */
-static ssize_t direct_entry(struct file *f, const char __user *user_buf,
-		size_t count, loff_t *off)
-{
-	const struct crashtype *crashtype;
-	char *buf;
-
-	if (count >= PAGE_SIZE)
-		return -EINVAL;
-	if (count < 1)
-		return -EINVAL;
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	if (copy_from_user(buf, user_buf, count)) {
-		free_page((unsigned long) buf);
-		return -EFAULT;
-	}
-	/* NULL-terminate and remove enter */
-	buf[count] = '\0';
-	strim(buf);
-
-	crashtype = find_crashtype(buf);
-	free_page((unsigned long) buf);
-	if (!crashtype)
-		return -EINVAL;
-
-	pr_info("Performing direct entry %s\n", crashtype->name);
-	lkdtm_do_action(crashtype);
-	*off += count;
-
-	return count;
-}
-
-static struct dentry *lkdtm_debugfs_root;
-
-static int __init lkdtm_module_init(void)
-{
-	struct crashpoint *crashpoint = NULL;
-	const struct crashtype *crashtype = NULL;
-	int ret = -EINVAL;
-	int i;
-
-	/* Neither or both of these need to be set */
-	if ((cpoint_type || cpoint_name) && !(cpoint_type && cpoint_name)) {
-		pr_err("Need both cpoint_type and cpoint_name or neither\n");
-		return -EINVAL;
-	}
-
-	if (cpoint_type) {
-		crashtype = find_crashtype(cpoint_type);
-		if (!crashtype) {
-			pr_err("Unknown crashtype '%s'\n", cpoint_type);
-			return -EINVAL;
-		}
-	}
-
-	if (cpoint_name) {
-		for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
-			if (!strcmp(cpoint_name, crashpoints[i].name))
-				crashpoint = &crashpoints[i];
-		}
-
-		/* Refuse unknown crashpoints. */
-		if (!crashpoint) {
-			pr_err("Invalid crashpoint %s\n", cpoint_name);
-			return -EINVAL;
-		}
-	}
-
-#ifdef CONFIG_KPROBES
-	/* Set crash count. */
-	crash_count = cpoint_count;
-#endif
-
-	/* Handle test-specific initialization. */
-	lkdtm_bugs_init(&recur_count);
-	lkdtm_perms_init();
-	lkdtm_usercopy_init();
-
-	/* Register debugfs interface */
-	lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
-	if (!lkdtm_debugfs_root) {
-		pr_err("creating root dir failed\n");
-		return -ENODEV;
-	}
-
-	/* Install debugfs trigger files. */
-	for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
-		struct crashpoint *cur = &crashpoints[i];
-		struct dentry *de;
-
-		de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
-					 cur, &cur->fops);
-		if (de == NULL) {
-			pr_err("could not create crashpoint %s\n", cur->name);
-			goto out_err;
-		}
-	}
-
-	/* Install crashpoint if one was selected. */
-	if (crashpoint) {
-		ret = lkdtm_register_cpoint(crashpoint, crashtype);
-		if (ret < 0) {
-			pr_info("Invalid crashpoint %s\n", crashpoint->name);
-			goto out_err;
-		}
-		pr_info("Crash point %s of type %s registered\n",
-			crashpoint->name, cpoint_type);
-	} else {
-		pr_info("No crash points registered, enable through debugfs\n");
-	}
-
-	return 0;
-
-out_err:
-	debugfs_remove_recursive(lkdtm_debugfs_root);
-	return ret;
-}
-
-static void __exit lkdtm_module_exit(void)
-{
-	debugfs_remove_recursive(lkdtm_debugfs_root);
-
-	/* Handle test-specific clean-up. */
-	lkdtm_usercopy_exit();
-
-	if (lkdtm_kprobe != NULL)
-		unregister_kprobe(lkdtm_kprobe);
-
-	pr_info("Crash point unregistered\n");
-}
-
-module_init(lkdtm_module_init);
-module_exit(lkdtm_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Kernel crash testing module");