2006-10-02 16:17:36 +07:00
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/*
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2016-06-04 01:16:32 +07:00
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* Linux Kernel Dump Test Module for testing kernel crashes conditions:
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* induces system failures at predefined crashpoints and under predefined
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* operational conditions in order to evaluate the reliability of kernel
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* sanity checking and crash dumps obtained using different dumping
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* solutions.
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2006-10-02 16:17:36 +07:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2006
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*
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* Author: Ankita Garg <ankita@in.ibm.com>
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*
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* It is adapted from the Linux Kernel Dump Test Tool by
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* Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
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*
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2010-03-06 04:42:49 +07:00
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* Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net>
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2006-10-02 16:17:36 +07:00
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*
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2010-03-06 04:42:49 +07:00
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* See Documentation/fault-injection/provoke-crashes.txt for instructions
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2006-10-02 16:17:36 +07:00
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*/
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2016-07-16 06:04:39 +07:00
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#include "lkdtm.h"
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2006-11-03 13:07:06 +07:00
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#include <linux/fs.h>
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2006-10-02 16:17:36 +07:00
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#include <linux/module.h>
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2006-11-03 13:07:06 +07:00
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#include <linux/buffer_head.h>
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2006-10-02 16:17:36 +07:00
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#include <linux/kprobes.h>
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2006-11-03 13:07:06 +07:00
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#include <linux/list.h>
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2006-10-02 16:17:36 +07:00
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#include <linux/init.h>
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#include <linux/interrupt.h>
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2006-11-03 13:07:06 +07:00
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#include <linux/hrtimer.h>
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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
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#include <linux/slab.h>
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2006-10-02 16:17:36 +07:00
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#include <scsi/scsi_cmnd.h>
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2010-03-06 04:42:49 +07:00
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#include <linux/debugfs.h>
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2006-10-02 16:17:36 +07:00
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#ifdef CONFIG_IDE
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#include <linux/ide.h>
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#endif
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2016-06-29 22:07:11 +07:00
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#define DEFAULT_COUNT 10
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2016-06-29 22:18:27 +07:00
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static int lkdtm_debugfs_open(struct inode *inode, struct file *file);
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static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
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size_t count, loff_t *off);
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static ssize_t direct_entry(struct file *f, const char __user *user_buf,
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size_t count, loff_t *off);
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2016-07-16 05:58:55 +07:00
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#ifdef CONFIG_KPROBES
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2017-10-20 20:31:27 +07:00
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static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs);
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2016-06-29 22:18:27 +07:00
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static ssize_t lkdtm_debugfs_entry(struct file *f,
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const char __user *user_buf,
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size_t count, loff_t *off);
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2017-10-20 20:31:27 +07:00
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# define CRASHPOINT_KPROBE(_symbol) \
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.kprobe = { \
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.symbol_name = (_symbol), \
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.pre_handler = lkdtm_kprobe_handler, \
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},
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# define CRASHPOINT_WRITE(_symbol) \
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(_symbol) ? lkdtm_debugfs_entry : direct_entry
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#else
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# define CRASHPOINT_KPROBE(_symbol)
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# define CRASHPOINT_WRITE(_symbol) direct_entry
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2016-06-29 22:10:36 +07:00
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#endif
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2016-06-29 22:18:27 +07:00
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/* Crash points */
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struct crashpoint {
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const char *name;
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const struct file_operations fops;
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2017-10-20 20:31:27 +07:00
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struct kprobe kprobe;
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2006-10-02 16:17:36 +07:00
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};
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2017-10-20 20:31:27 +07:00
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#define CRASHPOINT(_name, _symbol) \
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2016-06-29 22:18:27 +07:00
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{ \
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.name = _name, \
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.fops = { \
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.read = lkdtm_debugfs_read, \
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.llseek = generic_file_llseek, \
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.open = lkdtm_debugfs_open, \
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2017-10-20 20:31:27 +07:00
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.write = CRASHPOINT_WRITE(_symbol) \
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2016-06-29 22:18:27 +07:00
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}, \
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2017-10-20 20:31:27 +07:00
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CRASHPOINT_KPROBE(_symbol) \
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2016-06-29 22:18:27 +07:00
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}
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/* Define the possible places where we can trigger a crash point. */
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2017-10-20 20:31:27 +07:00
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static struct crashpoint crashpoints[] = {
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CRASHPOINT("DIRECT", NULL),
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2016-06-29 22:18:27 +07:00
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#ifdef CONFIG_KPROBES
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2017-10-20 20:31:27 +07:00
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CRASHPOINT("INT_HARDWARE_ENTRY", "do_IRQ"),
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CRASHPOINT("INT_HW_IRQ_EN", "handle_IRQ_event"),
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CRASHPOINT("INT_TASKLET_ENTRY", "tasklet_action"),
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CRASHPOINT("FS_DEVRW", "ll_rw_block"),
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CRASHPOINT("MEM_SWAPOUT", "shrink_inactive_list"),
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CRASHPOINT("TIMERADD", "hrtimer_start"),
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CRASHPOINT("SCSI_DISPATCH_CMD", "scsi_dispatch_cmd"),
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2016-06-29 22:18:27 +07:00
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# ifdef CONFIG_IDE
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2017-10-20 20:31:27 +07:00
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CRASHPOINT("IDE_CORE_CP", "generic_ide_ioctl"),
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2016-06-29 22:18:27 +07:00
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# endif
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#endif
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2006-10-02 16:17:36 +07:00
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};
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2016-06-29 22:18:27 +07:00
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/* Crash types. */
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struct crashtype {
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const char *name;
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void (*func)(void);
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2006-10-02 16:17:36 +07:00
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};
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2016-06-29 22:18:27 +07:00
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#define CRASHTYPE(_name) \
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{ \
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.name = __stringify(_name), \
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.func = lkdtm_ ## _name, \
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}
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/* Define the possible types of crashes that can be triggered. */
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2017-10-20 20:31:49 +07:00
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static const struct crashtype crashtypes[] = {
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2016-06-29 22:18:27 +07:00
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CRASHTYPE(PANIC),
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CRASHTYPE(BUG),
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CRASHTYPE(WARNING),
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CRASHTYPE(EXCEPTION),
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CRASHTYPE(LOOP),
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CRASHTYPE(OVERFLOW),
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2016-08-18 04:42:12 +07:00
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CRASHTYPE(CORRUPT_LIST_ADD),
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CRASHTYPE(CORRUPT_LIST_DEL),
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2017-03-25 00:51:25 +07:00
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CRASHTYPE(CORRUPT_USER_DS),
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2016-06-29 22:18:27 +07:00
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CRASHTYPE(CORRUPT_STACK),
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2017-08-05 04:34:40 +07:00
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CRASHTYPE(CORRUPT_STACK_STRONG),
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2017-08-05 03:04:21 +07:00
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CRASHTYPE(STACK_GUARD_PAGE_LEADING),
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CRASHTYPE(STACK_GUARD_PAGE_TRAILING),
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2016-06-29 22:18:27 +07:00
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CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE),
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CRASHTYPE(OVERWRITE_ALLOCATION),
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CRASHTYPE(WRITE_AFTER_FREE),
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CRASHTYPE(READ_AFTER_FREE),
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CRASHTYPE(WRITE_BUDDY_AFTER_FREE),
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CRASHTYPE(READ_BUDDY_AFTER_FREE),
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CRASHTYPE(SOFTLOCKUP),
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CRASHTYPE(HARDLOCKUP),
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CRASHTYPE(SPINLOCKUP),
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CRASHTYPE(HUNG_TASK),
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CRASHTYPE(EXEC_DATA),
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CRASHTYPE(EXEC_STACK),
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CRASHTYPE(EXEC_KMALLOC),
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CRASHTYPE(EXEC_VMALLOC),
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CRASHTYPE(EXEC_RODATA),
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CRASHTYPE(EXEC_USERSPACE),
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CRASHTYPE(ACCESS_USERSPACE),
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CRASHTYPE(WRITE_RO),
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CRASHTYPE(WRITE_RO_AFTER_INIT),
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CRASHTYPE(WRITE_KERN),
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2017-04-25 03:23:21 +07:00
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CRASHTYPE(REFCOUNT_INC_OVERFLOW),
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CRASHTYPE(REFCOUNT_ADD_OVERFLOW),
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CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW),
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CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW),
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CRASHTYPE(REFCOUNT_DEC_ZERO),
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CRASHTYPE(REFCOUNT_DEC_NEGATIVE),
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CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE),
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CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE),
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CRASHTYPE(REFCOUNT_INC_ZERO),
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CRASHTYPE(REFCOUNT_ADD_ZERO),
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CRASHTYPE(REFCOUNT_INC_SATURATED),
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CRASHTYPE(REFCOUNT_DEC_SATURATED),
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CRASHTYPE(REFCOUNT_ADD_SATURATED),
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CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED),
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CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED),
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CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED),
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CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED),
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2017-07-21 20:19:14 +07:00
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CRASHTYPE(REFCOUNT_TIMING),
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CRASHTYPE(ATOMIC_TIMING),
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2016-06-29 22:18:27 +07:00
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CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
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CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
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CRASHTYPE(USERCOPY_HEAP_FLAG_TO),
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CRASHTYPE(USERCOPY_HEAP_FLAG_FROM),
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CRASHTYPE(USERCOPY_STACK_FRAME_TO),
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CRASHTYPE(USERCOPY_STACK_FRAME_FROM),
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CRASHTYPE(USERCOPY_STACK_BEYOND),
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CRASHTYPE(USERCOPY_KERNEL),
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2006-10-02 16:17:36 +07:00
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};
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2016-06-29 22:18:27 +07:00
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2017-10-20 20:31:27 +07:00
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/* Global kprobe entry and crashtype. */
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static struct kprobe *lkdtm_kprobe;
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2017-10-20 20:31:49 +07:00
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static struct crashpoint *lkdtm_crashpoint;
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static const struct crashtype *lkdtm_crashtype;
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2006-10-02 16:17:36 +07:00
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2016-06-29 22:07:11 +07:00
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/* Module parameters */
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static int recur_count = -1;
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2006-10-02 16:17:36 +07:00
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module_param(recur_count, int, 0644);
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2013-10-24 23:25:39 +07:00
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MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test");
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2016-06-29 22:07:11 +07:00
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static char* cpoint_name;
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2010-08-12 12:04:21 +07:00
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module_param(cpoint_name, charp, 0444);
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2006-11-03 13:07:06 +07:00
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MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
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2016-06-29 22:07:11 +07:00
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static char* cpoint_type;
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2010-08-12 12:04:21 +07:00
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module_param(cpoint_type, charp, 0444);
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2006-11-03 13:07:06 +07:00
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MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
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"hitting the crash point");
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2016-06-29 22:07:11 +07:00
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static int cpoint_count = DEFAULT_COUNT;
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2006-11-03 13:07:06 +07:00
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module_param(cpoint_count, int, 0644);
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MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
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"crash point is to be hit to trigger action");
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2006-10-02 16:17:36 +07:00
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2010-03-06 04:42:49 +07:00
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2016-06-29 22:18:27 +07:00
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/* Return the crashtype number or NULL if the name is invalid */
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2017-10-20 20:31:49 +07:00
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static const struct crashtype *find_crashtype(const char *name)
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2006-10-02 16:17:36 +07:00
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{
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int i;
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2010-03-06 04:42:49 +07:00
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2016-06-29 22:18:27 +07:00
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for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
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if (!strcmp(name, crashtypes[i].name))
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return &crashtypes[i];
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2006-10-02 16:17:36 +07:00
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}
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2016-06-29 22:18:27 +07:00
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return NULL;
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2006-10-02 16:17:36 +07:00
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}
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2016-06-29 22:18:27 +07:00
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/*
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* This is forced noinline just so it distinctly shows up in the stackdump
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* which makes validation of expected lkdtm crashes easier.
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*/
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2017-10-20 20:31:49 +07:00
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static noinline void lkdtm_do_action(const struct crashtype *crashtype)
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2006-10-02 16:17:36 +07:00
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{
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2017-10-20 20:31:27 +07:00
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if (WARN_ON(!crashtype || !crashtype->func))
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return;
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2016-06-29 22:18:27 +07:00
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crashtype->func();
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2010-03-06 04:42:49 +07:00
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}
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2016-06-29 22:18:27 +07:00
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|
|
static int lkdtm_register_cpoint(struct crashpoint *crashpoint,
|
2017-10-20 20:31:49 +07:00
|
|
|
const struct crashtype *crashtype)
|
2006-10-02 16:17:36 +07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
/* If this doesn't have a symbol, just call immediately. */
|
2017-10-20 20:31:27 +07:00
|
|
|
if (!crashpoint->kprobe.symbol_name) {
|
2016-06-29 22:18:27 +07:00
|
|
|
lkdtm_do_action(crashtype);
|
2010-03-06 04:42:49 +07:00
|
|
|
return 0;
|
2006-10-02 16:17:36 +07:00
|
|
|
}
|
|
|
|
|
2017-10-20 20:31:27 +07:00
|
|
|
if (lkdtm_kprobe != NULL)
|
|
|
|
unregister_kprobe(lkdtm_kprobe);
|
2016-06-29 22:18:27 +07:00
|
|
|
|
|
|
|
lkdtm_crashpoint = crashpoint;
|
|
|
|
lkdtm_crashtype = crashtype;
|
2017-10-20 20:31:27 +07:00
|
|
|
lkdtm_kprobe = &crashpoint->kprobe;
|
|
|
|
ret = register_kprobe(lkdtm_kprobe);
|
2016-06-29 22:18:27 +07:00
|
|
|
if (ret < 0) {
|
2017-10-20 20:31:27 +07:00
|
|
|
pr_info("Couldn't register kprobe %s\n",
|
|
|
|
crashpoint->kprobe.symbol_name);
|
|
|
|
lkdtm_kprobe = NULL;
|
2016-06-29 22:18:27 +07:00
|
|
|
lkdtm_crashpoint = NULL;
|
|
|
|
lkdtm_crashtype = NULL;
|
2010-03-06 04:42:49 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2016-07-16 05:58:55 +07:00
|
|
|
#ifdef CONFIG_KPROBES
|
|
|
|
/* Global crash counter and spinlock. */
|
|
|
|
static int crash_count = DEFAULT_COUNT;
|
|
|
|
static DEFINE_SPINLOCK(crash_count_lock);
|
|
|
|
|
2017-10-20 20:31:27 +07:00
|
|
|
/* Called by kprobe entry points. */
|
|
|
|
static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs)
|
2016-07-16 05:58:55 +07:00
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
bool do_it = false;
|
|
|
|
|
2017-10-20 20:31:27 +07:00
|
|
|
if (WARN_ON(!lkdtm_crashpoint || !lkdtm_crashtype))
|
|
|
|
return 0;
|
2016-07-16 05:58:55 +07:00
|
|
|
|
|
|
|
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);
|
2017-10-20 20:31:27 +07:00
|
|
|
|
|
|
|
return 0;
|
2016-07-16 05:58:55 +07:00
|
|
|
}
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
static ssize_t lkdtm_debugfs_entry(struct file *f,
|
|
|
|
const char __user *user_buf,
|
|
|
|
size_t count, loff_t *off)
|
2010-03-06 04:42:49 +07:00
|
|
|
{
|
2016-06-29 22:18:27 +07:00
|
|
|
struct crashpoint *crashpoint = file_inode(f)->i_private;
|
2017-10-20 20:31:49 +07:00
|
|
|
const struct crashtype *crashtype = NULL;
|
2010-03-06 04:42:49 +07:00
|
|
|
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);
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
crashtype = find_crashtype(buf);
|
|
|
|
free_page((unsigned long)buf);
|
2010-03-06 04:42:49 +07:00
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
if (!crashtype)
|
2010-03-06 04:42:49 +07:00
|
|
|
return -EINVAL;
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
err = lkdtm_register_cpoint(crashpoint, crashtype);
|
2010-03-06 04:42:49 +07:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
*off += count;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
2016-07-16 05:58:55 +07:00
|
|
|
#endif
|
2010-03-06 04:42:49 +07:00
|
|
|
|
|
|
|
/* 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);
|
2012-07-31 04:43:24 +07:00
|
|
|
if (buf == NULL)
|
|
|
|
return -ENOMEM;
|
2010-03-06 04:42:49 +07:00
|
|
|
|
|
|
|
n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
|
2016-06-29 22:18:27 +07:00
|
|
|
for (i = 0; i < ARRAY_SIZE(crashtypes); i++) {
|
|
|
|
n += snprintf(buf + n, PAGE_SIZE - n, "%s\n",
|
|
|
|
crashtypes[i].name);
|
|
|
|
}
|
2010-03-06 04:42:49 +07:00
|
|
|
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)
|
|
|
|
{
|
2017-10-20 20:31:49 +07:00
|
|
|
const struct crashtype *crashtype;
|
2010-03-06 04:42:49 +07:00
|
|
|
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);
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
crashtype = find_crashtype(buf);
|
2010-03-06 04:42:49 +07:00
|
|
|
free_page((unsigned long) buf);
|
2016-06-29 22:18:27 +07:00
|
|
|
if (!crashtype)
|
2010-03-06 04:42:49 +07:00
|
|
|
return -EINVAL;
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
pr_info("Performing direct entry %s\n", crashtype->name);
|
|
|
|
lkdtm_do_action(crashtype);
|
2010-03-06 04:42:49 +07:00
|
|
|
*off += count;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct dentry *lkdtm_debugfs_root;
|
|
|
|
|
|
|
|
static int __init lkdtm_module_init(void)
|
|
|
|
{
|
2016-06-29 22:18:27 +07:00
|
|
|
struct crashpoint *crashpoint = NULL;
|
2017-10-20 20:31:49 +07:00
|
|
|
const struct crashtype *crashtype = NULL;
|
2010-03-06 04:42:49 +07:00
|
|
|
int ret = -EINVAL;
|
|
|
|
int i;
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-07-16 05:58:55 +07:00
|
|
|
#ifdef CONFIG_KPROBES
|
2016-06-29 22:18:27 +07:00
|
|
|
/* Set crash count. */
|
|
|
|
crash_count = cpoint_count;
|
2016-07-16 05:58:55 +07:00
|
|
|
#endif
|
2016-06-29 22:18:27 +07:00
|
|
|
|
2016-06-26 22:46:23 +07:00
|
|
|
/* Handle test-specific initialization. */
|
2016-06-27 12:17:25 +07:00
|
|
|
lkdtm_bugs_init(&recur_count);
|
2016-06-27 05:12:31 +07:00
|
|
|
lkdtm_perms_init();
|
2016-06-26 22:46:23 +07:00
|
|
|
lkdtm_usercopy_init();
|
|
|
|
|
2010-03-06 04:42:49 +07:00
|
|
|
/* Register debugfs interface */
|
|
|
|
lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
|
|
|
|
if (!lkdtm_debugfs_root) {
|
2014-02-10 04:48:46 +07:00
|
|
|
pr_err("creating root dir failed\n");
|
2010-03-06 04:42:49 +07:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
/* Install debugfs trigger files. */
|
|
|
|
for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
|
|
|
|
struct crashpoint *cur = &crashpoints[i];
|
2010-03-06 04:42:49 +07:00
|
|
|
struct dentry *de;
|
|
|
|
|
|
|
|
de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
|
2016-06-29 22:18:27 +07:00
|
|
|
cur, &cur->fops);
|
2010-03-06 04:42:49 +07:00
|
|
|
if (de == NULL) {
|
2016-06-29 22:18:27 +07:00
|
|
|
pr_err("could not create crashpoint %s\n", cur->name);
|
2010-03-06 04:42:49 +07:00
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-06-29 22:18:27 +07:00
|
|
|
/* Install crashpoint if one was selected. */
|
|
|
|
if (crashpoint) {
|
|
|
|
ret = lkdtm_register_cpoint(crashpoint, crashtype);
|
2010-03-06 04:42:49 +07:00
|
|
|
if (ret < 0) {
|
2016-06-29 22:18:27 +07:00
|
|
|
pr_info("Invalid crashpoint %s\n", crashpoint->name);
|
2010-03-06 04:42:49 +07:00
|
|
|
goto out_err;
|
|
|
|
}
|
2014-02-10 04:48:46 +07:00
|
|
|
pr_info("Crash point %s of type %s registered\n",
|
2016-06-29 22:18:27 +07:00
|
|
|
crashpoint->name, cpoint_type);
|
2010-03-06 04:42:49 +07:00
|
|
|
} else {
|
2014-02-10 04:48:46 +07:00
|
|
|
pr_info("No crash points registered, enable through debugfs\n");
|
2006-10-02 16:17:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2010-03-06 04:42:49 +07:00
|
|
|
|
|
|
|
out_err:
|
|
|
|
debugfs_remove_recursive(lkdtm_debugfs_root);
|
|
|
|
return ret;
|
2006-10-02 16:17:36 +07:00
|
|
|
}
|
|
|
|
|
2008-02-06 16:36:50 +07:00
|
|
|
static void __exit lkdtm_module_exit(void)
|
2006-10-02 16:17:36 +07:00
|
|
|
{
|
2010-03-06 04:42:49 +07:00
|
|
|
debugfs_remove_recursive(lkdtm_debugfs_root);
|
|
|
|
|
2016-06-26 22:46:23 +07:00
|
|
|
/* Handle test-specific clean-up. */
|
|
|
|
lkdtm_usercopy_exit();
|
2016-06-04 02:06:52 +07:00
|
|
|
|
2017-10-20 20:31:27 +07:00
|
|
|
if (lkdtm_kprobe != NULL)
|
|
|
|
unregister_kprobe(lkdtm_kprobe);
|
2017-01-19 17:40:13 +07:00
|
|
|
|
2014-02-10 04:48:46 +07:00
|
|
|
pr_info("Crash point unregistered\n");
|
2006-10-02 16:17:36 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(lkdtm_module_init);
|
|
|
|
module_exit(lkdtm_module_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2016-06-29 22:18:27 +07:00
|
|
|
MODULE_DESCRIPTION("Kernel crash testing module");
|