linux_dsm_epyc7002/drivers/misc/lkdtm_core.c

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/*
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 15:04:11 +07:00
#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);
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#ifdef CONFIG_KPROBES
static void lkdtm_handler(void);
static ssize_t lkdtm_debugfs_entry(struct file *f,
const char __user *user_buf,
size_t count, loff_t *off);
/* jprobe entry point handlers. */
static unsigned int jp_do_irq(unsigned int irq)
{
lkdtm_handler();
jprobe_return();
return 0;
}
static irqreturn_t jp_handle_irq_event(unsigned int irq,
struct irqaction *action)
{
lkdtm_handler();
jprobe_return();
return 0;
}
static void jp_tasklet_action(struct softirq_action *a)
{
lkdtm_handler();
jprobe_return();
}
static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
{
lkdtm_handler();
jprobe_return();
}
struct scan_control;
static unsigned long jp_shrink_inactive_list(unsigned long max_scan,
struct zone *zone,
struct scan_control *sc)
{
lkdtm_handler();
jprobe_return();
return 0;
}
static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
const enum hrtimer_mode mode)
{
lkdtm_handler();
jprobe_return();
return 0;
}
static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
{
lkdtm_handler();
jprobe_return();
return 0;
}
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# ifdef CONFIG_IDE
static int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
struct block_device *bdev, unsigned int cmd,
unsigned long arg)
{
lkdtm_handler();
jprobe_return();
return 0;
}
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# endif
#endif
/* Crash points */
struct crashpoint {
const char *name;
const struct file_operations fops;
struct jprobe jprobe;
};
#define CRASHPOINT(_name, _write, _symbol, _entry) \
{ \
.name = _name, \
.fops = { \
.read = lkdtm_debugfs_read, \
.llseek = generic_file_llseek, \
.open = lkdtm_debugfs_open, \
.write = _write, \
}, \
.jprobe = { \
.kp.symbol_name = _symbol, \
.entry = (kprobe_opcode_t *)_entry, \
}, \
}
/* Define the possible places where we can trigger a crash point. */
struct crashpoint crashpoints[] = {
CRASHPOINT("DIRECT", direct_entry,
NULL, NULL),
#ifdef CONFIG_KPROBES
CRASHPOINT("INT_HARDWARE_ENTRY", lkdtm_debugfs_entry,
"do_IRQ", jp_do_irq),
CRASHPOINT("INT_HW_IRQ_EN", lkdtm_debugfs_entry,
"handle_IRQ_event", jp_handle_irq_event),
CRASHPOINT("INT_TASKLET_ENTRY", lkdtm_debugfs_entry,
"tasklet_action", jp_tasklet_action),
CRASHPOINT("FS_DEVRW", lkdtm_debugfs_entry,
"ll_rw_block", jp_ll_rw_block),
CRASHPOINT("MEM_SWAPOUT", lkdtm_debugfs_entry,
"shrink_inactive_list", jp_shrink_inactive_list),
CRASHPOINT("TIMERADD", lkdtm_debugfs_entry,
"hrtimer_start", jp_hrtimer_start),
CRASHPOINT("SCSI_DISPATCH_CMD", lkdtm_debugfs_entry,
"scsi_dispatch_cmd", jp_scsi_dispatch_cmd),
# ifdef CONFIG_IDE
CRASHPOINT("IDE_CORE_CP", lkdtm_debugfs_entry,
"generic_ide_ioctl", jp_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. */
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(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_SATURATE_INC),
CRASHTYPE(REFCOUNT_SATURATE_ADD),
CRASHTYPE(REFCOUNT_ZERO_DEC),
CRASHTYPE(REFCOUNT_ZERO_INC),
CRASHTYPE(REFCOUNT_ZERO_SUB),
CRASHTYPE(REFCOUNT_ZERO_ADD),
CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
CRASHTYPE(USERCOPY_HEAP_FLAG_TO),
CRASHTYPE(USERCOPY_HEAP_FLAG_FROM),
CRASHTYPE(USERCOPY_STACK_FRAME_TO),
CRASHTYPE(USERCOPY_STACK_FRAME_FROM),
CRASHTYPE(USERCOPY_STACK_BEYOND),
CRASHTYPE(USERCOPY_KERNEL),
};
/* Global jprobe entry and crashtype. */
static struct jprobe *lkdtm_jprobe;
struct crashpoint *lkdtm_crashpoint;
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 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(struct crashtype *crashtype)
{
BUG_ON(!crashtype || !crashtype->func);
crashtype->func();
}
static int lkdtm_register_cpoint(struct crashpoint *crashpoint,
struct crashtype *crashtype)
{
int ret;
/* If this doesn't have a symbol, just call immediately. */
if (!crashpoint->jprobe.kp.symbol_name) {
lkdtm_do_action(crashtype);
return 0;
}
if (lkdtm_jprobe != NULL)
unregister_jprobe(lkdtm_jprobe);
lkdtm_crashpoint = crashpoint;
lkdtm_crashtype = crashtype;
lkdtm_jprobe = &crashpoint->jprobe;
ret = register_jprobe(lkdtm_jprobe);
if (ret < 0) {
pr_info("Couldn't register jprobe %s\n",
crashpoint->jprobe.kp.symbol_name);
lkdtm_jprobe = NULL;
lkdtm_crashpoint = NULL;
lkdtm_crashtype = NULL;
}
return ret;
}
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#ifdef CONFIG_KPROBES
/* Global crash counter and spinlock. */
static int crash_count = DEFAULT_COUNT;
static DEFINE_SPINLOCK(crash_count_lock);
/* Called by jprobe entry points. */
static void lkdtm_handler(void)
{
unsigned long flags;
bool do_it = false;
BUG_ON(!lkdtm_crashpoint || !lkdtm_crashtype);
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);
}
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;
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;
}
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#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)
{
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;
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;
}
}
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#ifdef CONFIG_KPROBES
/* Set crash count. */
crash_count = cpoint_count;
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#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_jprobe != NULL)
unregister_jprobe(lkdtm_jprobe);
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");