Release 4.7 include/linux/kprobes.h

#ifndef _LINUX_KPROBES_H

#define _LINUX_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *  include/linux/kprobes.h
 *
 * 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, 2002, 2004
 *
 * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *              Probes initial implementation ( includes suggestions from
 *              Rusty Russell).
 * 2004-July    Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
 *              interface to access function arguments.
 * 2005-May     Hien Nguyen <hien@us.ibm.com> and Jim Keniston
 *              <jkenisto@us.ibm.com>  and Prasanna S Panchamukhi
 *              <prasanna@in.ibm.com> added function-return probes.
 */
#include <linux/compiler.h>	/* for __kprobes */
#include <linux/linkage.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/bug.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>
#include <linux/ftrace.h>

#ifdef CONFIG_KPROBES
#include <asm/kprobes.h>

/* kprobe_status settings */

#define KPROBE_HIT_ACTIVE	0x00000001

#define KPROBE_HIT_SS		0x00000002

#define KPROBE_REENTER		0x00000004

#define KPROBE_HIT_SSDONE	0x00000008

#else /* CONFIG_KPROBES */

typedef int kprobe_opcode_t;

struct arch_specific_insn {
	
int dummy;
};
#endif /* CONFIG_KPROBES */

struct kprobe;
struct pt_regs;
struct kretprobe;
struct kretprobe_instance;

typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);

typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);

typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
				       unsigned long flags);

typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
				       int trapnr);

typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
				    struct pt_regs *);


struct kprobe {
	
struct hlist_node hlist;

	/* list of kprobes for multi-handler support */
	
struct list_head list;

	/*count the number of times this probe was temporarily disarmed */
	
unsigned long nmissed;

	/* location of the probe point */
	
kprobe_opcode_t *addr;

	/* Allow user to indicate symbol name of the probe point */
	
const char *symbol_name;

	/* Offset into the symbol */
	
unsigned int offset;

	/* Called before addr is executed. */
	
kprobe_pre_handler_t pre_handler;

	/* Called after addr is executed, unless... */
	
kprobe_post_handler_t post_handler;

	/*
         * ... called if executing addr causes a fault (eg. page fault).
         * Return 1 if it handled fault, otherwise kernel will see it.
         */
	
kprobe_fault_handler_t fault_handler;

	/*
         * ... called if breakpoint trap occurs in probe handler.
         * Return 1 if it handled break, otherwise kernel will see it.
         */
	
kprobe_break_handler_t break_handler;

	/* Saved opcode (which has been replaced with breakpoint) */
	
kprobe_opcode_t opcode;

	/* copy of the original instruction */
	
struct arch_specific_insn ainsn;

	/*
         * Indicates various status flags.
         * Protected by kprobe_mutex after this kprobe is registered.
         */
	
u32 flags;
};

/* Kprobe status flags */

#define KPROBE_FLAG_GONE	1 
/* breakpoint has already gone */

#define KPROBE_FLAG_DISABLED	2 
/* probe is temporarily disabled */

#define KPROBE_FLAG_OPTIMIZED	4 
/*
                                   * probe is really optimized.
                                   * NOTE:
                                   * this flag is only for optimized_kprobe.
                                   */

#define KPROBE_FLAG_FTRACE	8 
/* probe is using ftrace */

/* Has this kprobe gone ? */


static inline int kprobe_gone(struct kprobe *p)
{
	return p->flags & KPROBE_FLAG_GONE;
}

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/* Is this kprobe disabled ? */


static inline int kprobe_disabled(struct kprobe *p)
{
	return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
}

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/* Is this kprobe really running optimized path ? */


static inline int kprobe_optimized(struct kprobe *p)
{
	return p->flags & KPROBE_FLAG_OPTIMIZED;
}

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/* Is this kprobe uses ftrace ? */


static inline int kprobe_ftrace(struct kprobe *p)
{
	return p->flags & KPROBE_FLAG_FTRACE;
}

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/*
 * Special probe type that uses setjmp-longjmp type tricks to resume
 * execution at a specified entry with a matching prototype corresponding
 * to the probed function - a trick to enable arguments to become
 * accessible seamlessly by probe handling logic.
 * Note:
 * Because of the way compilers allocate stack space for local variables
 * etc upfront, regardless of sub-scopes within a function, this mirroring
 * principle currently works only for probes placed on function entry points.
 */

struct jprobe {
	
struct kprobe kp;
	
void *entry;	/* probe handling code to jump to */
};

/* For backward compatibility with old code using JPROBE_ENTRY() */

#define JPROBE_ENTRY(handler)	(handler)

/*
 * Function-return probe -
 * Note:
 * User needs to provide a handler function, and initialize maxactive.
 * maxactive - The maximum number of instances of the probed function that
 * can be active concurrently.
 * nmissed - tracks the number of times the probed function's return was
 * ignored, due to maxactive being too low.
 *
 */

struct kretprobe {
	
struct kprobe kp;
	
kretprobe_handler_t handler;
	
kretprobe_handler_t entry_handler;
	
int maxactive;
	
int nmissed;
	
size_t data_size;
	
struct hlist_head free_instances;
	
raw_spinlock_t lock;
};


struct kretprobe_instance {
	
struct hlist_node hlist;
	
struct kretprobe *rp;
	
kprobe_opcode_t *ret_addr;
	
struct task_struct *task;
	
char data[0];
};


struct kretprobe_blackpoint {
	
const char *name;
	
void *addr;
};


struct kprobe_blacklist_entry {
	
struct list_head list;
	
unsigned long start_addr;
	
unsigned long end_addr;
};

#ifdef CONFIG_KPROBES
DECLARE_PER_CPU(struct kprobe *, current_kprobe);
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);

/*
 * For #ifdef avoidance:
 */


static inline int kprobes_built_in(void)
{
	return 1;
}

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#ifdef CONFIG_KRETPROBES
extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
				   struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
#else /* CONFIG_KRETPROBES */


static inline void arch_prepare_kretprobe(struct kretprobe *rp,
					struct pt_regs *regs)
{
}
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static inline int arch_trampoline_kprobe(struct kprobe *p)
{
	return 0;
}
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#endif /* CONFIG_KRETPROBES */

extern struct kretprobe_blackpoint kretprobe_blacklist[];



static inline void kretprobe_assert(struct kretprobe_instance *ri,
	unsigned long orig_ret_address, unsigned long trampoline_address)
{
	if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
		printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
				ri->rp, ri->rp->kp.addr);
		BUG();
	}
}

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#ifdef CONFIG_KPROBES_SANITY_TEST
extern int init_test_probes(void);
#else


static inline int init_test_probes(void)
{
	return 0;
}
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#endif /* CONFIG_KPROBES_SANITY_TEST */

extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
extern int arch_init_kprobes(void);
extern void show_registers(struct pt_regs *regs);
extern void kprobes_inc_nmissed_count(struct kprobe *p);
extern bool arch_within_kprobe_blacklist(unsigned long addr);

extern bool within_kprobe_blacklist(unsigned long addr);


struct kprobe_insn_cache {
	
struct mutex mutex;
	
void *(*alloc)(void);	/* allocate insn page */
	
void (*free)(void *);	/* free insn page */
	
struct list_head pages; /* list of kprobe_insn_page */
	
size_t insn_size;	/* size of instruction slot */
	
int nr_garbage;
};

extern kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c);
extern void __free_insn_slot(struct kprobe_insn_cache *c,
			     kprobe_opcode_t *slot, int dirty);


#define DEFINE_INSN_CACHE_OPS(__name)					\
extern struct kprobe_insn_cache kprobe_##__name##_slots;                \
                                                                        \
static inline kprobe_opcode_t *get_##__name##_slot(void)                \
{                                                                       \
        return __get_insn_slot(&kprobe_##__name##_slots);               \
}                                                                       \
                                                                        \
static inline void free_##__name##_slot(kprobe_opcode_t *slot, int dirty)\
{                                                                       \
        __free_insn_slot(&kprobe_##__name##_slots, slot, dirty);        \
}                                                                       \

DEFINE_INSN_CACHE_OPS(insn);

#ifdef CONFIG_OPTPROBES
/*
 * Internal structure for direct jump optimized probe
 */

struct optimized_kprobe {
	
struct kprobe kp;
	
struct list_head list;	/* list for optimizing queue */
	
struct arch_optimized_insn optinsn;
};

/* Architecture dependent functions for direct jump optimization */
extern int arch_prepared_optinsn(struct arch_optimized_insn *optinsn);
extern int arch_check_optimized_kprobe(struct optimized_kprobe *op);
extern int arch_prepare_optimized_kprobe(struct optimized_kprobe *op,
					 struct kprobe *orig);
extern void arch_remove_optimized_kprobe(struct optimized_kprobe *op);
extern void arch_optimize_kprobes(struct list_head *oplist);
extern void arch_unoptimize_kprobes(struct list_head *oplist,
				    struct list_head *done_list);
extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
					unsigned long addr);

extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);


DEFINE_INSN_CACHE_OPS(optinsn);

#ifdef CONFIG_SYSCTL
extern int sysctl_kprobes_optimization;
extern int proc_kprobes_optimization_handler(struct ctl_table *table,
					     int write, void __user *buffer,
					     size_t *length, loff_t *ppos);
#endif

#endif /* CONFIG_OPTPROBES */
#ifdef CONFIG_KPROBES_ON_FTRACE
extern void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
				  struct ftrace_ops *ops, struct pt_regs *regs);
extern int arch_prepare_kprobe_ftrace(struct kprobe *p);
#endif

int arch_check_ftrace_location(struct kprobe *p);

/* Get the kprobe at this addr (if any) - called with preemption disabled */
struct kprobe *get_kprobe(void *addr);
void kretprobe_hash_lock(struct task_struct *tsk,
			 struct hlist_head **head, unsigned long *flags);
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);

/* kprobe_running() will just return the current_kprobe on this CPU */


static inline struct kprobe *kprobe_running(void)
{
	return (__this_cpu_read(current_kprobe));
}

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static inline void reset_current_kprobe(void)
{
	__this_cpu_write(current_kprobe, NULL);
}

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static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
{
	return this_cpu_ptr(&kprobe_ctlblk);
}

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int register_kprobe(struct kprobe *p);
void unregister_kprobe(struct kprobe *p);
int register_kprobes(struct kprobe **kps, int num);
void unregister_kprobes(struct kprobe **kps, int num);
int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
int longjmp_break_handler(struct kprobe *, struct pt_regs *);
int register_jprobe(struct jprobe *p);
void unregister_jprobe(struct jprobe *p);
int register_jprobes(struct jprobe **jps, int num);
void unregister_jprobes(struct jprobe **jps, int num);
void jprobe_return(void);
unsigned long arch_deref_entry_point(void *);

int register_kretprobe(struct kretprobe *rp);
void unregister_kretprobe(struct kretprobe *rp);
int register_kretprobes(struct kretprobe **rps, int num);
void unregister_kretprobes(struct kretprobe **rps, int num);

void kprobe_flush_task(struct task_struct *tk);
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);

int disable_kprobe(struct kprobe *kp);
int enable_kprobe(struct kprobe *kp);

void dump_kprobe(struct kprobe *kp);

#else /* !CONFIG_KPROBES: */



static inline int kprobes_built_in(void)
{
	return 0;
}
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static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
	return 0;
}
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static inline struct kprobe *get_kprobe(void *addr)
{
	return NULL;
}
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static inline struct kprobe *kprobe_running(void)
{
	return NULL;
}
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static inline int register_kprobe(struct kprobe *p)
{
	return -ENOSYS;
}
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static inline int register_kprobes(struct kprobe **kps, int num)
{
	return -ENOSYS;
}
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static inline void unregister_kprobe(struct kprobe *p)
{
}
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static inline void unregister_kprobes(struct kprobe **kps, int num)
{
}
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static inline int register_jprobe(struct jprobe *p)
{
	return -ENOSYS;
}
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static inline int register_jprobes(struct jprobe **jps, int num)
{
	return -ENOSYS;
}
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static inline void unregister_jprobe(struct jprobe *p)
{
}
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static inline void unregister_jprobes(struct jprobe **jps, int num)
{
}
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static inline void jprobe_return(void)
{
}
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static inline int register_kretprobe(struct kretprobe *rp)
{
	return -ENOSYS;
}
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static inline int register_kretprobes(struct kretprobe **rps, int num)
{
	return -ENOSYS;
}
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static inline void unregister_kretprobe(struct kretprobe *rp)
{
}
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static inline void unregister_kretprobes(struct kretprobe **rps, int num)
{
}
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static inline void kprobe_flush_task(struct task_struct *tk)
{
}
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static inline int disable_kprobe(struct kprobe *kp)
{
	return -ENOSYS;
}
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static inline int enable_kprobe(struct kprobe *kp)
{
	return -ENOSYS;
}
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#endif /* CONFIG_KPROBES */


static inline int disable_kretprobe(struct kretprobe *rp)
{
	return disable_kprobe(&rp->kp);
}
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static inline int enable_kretprobe(struct kretprobe *rp)
{
	return enable_kprobe(&rp->kp);
}
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static inline int disable_jprobe(struct jprobe *jp)
{
	return disable_kprobe(&jp->kp);
}
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static inline int enable_jprobe(struct jprobe *jp)
{
	return enable_kprobe(&jp->kp);
}

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#ifdef CONFIG_KPROBES
/*
 * Blacklist ganerating macro. Specify functions which is not probed
 * by using this macro.
 */

#define __NOKPROBE_SYMBOL(fname)			\
static unsigned long __used                             \
        __attribute__((section("_kprobe_blacklist")))   \
        _kbl_addr_##fname = (unsigned long)fname;

#define NOKPROBE_SYMBOL(fname)	__NOKPROBE_SYMBOL(fname)
#else

#define NOKPROBE_SYMBOL(fname)
#endif

#endif /* _LINUX_KPROBES_H */
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CommitProp
masami hiramatsu
masami hiramatsu
812
45.77%
21
35.00%
prasanna s panchamukhi
prasanna s panchamukhi
344
19.39%
4
6.67%
ananth n. mavinakayanahalli
ananth n. mavinakayanahalli
172
9.70%
9
15.00%
hien nguyen
hien nguyen
152
8.57%
1
1.67%
heiko carstens
heiko carstens
84
4.74%
3
5.00%
ingo molnar
ingo molnar
50
2.82%
3
5.00%
srinivasa d s
srinivasa d s
47
2.65%
2
3.33%
rusty lynch
rusty lynch
30
1.69%
3
5.00%
abhishek sagar
abhishek sagar
28
1.58%
2
3.33%
michael ellerman
michael ellerman
17
0.96%
3
5.00%
frederic weisbecker
frederic weisbecker
9
0.51%
1
1.67%
andy lutomirski
andy lutomirski
9
0.51%
1
1.67%
christoph lameter
christoph lameter
6
0.34%
2
3.33%
bibo mao
bibo mao
5
0.28%
1
1.67%
anil keshavamurthy
anil keshavamurthy
5
0.28%
2
3.33%
paul gortmaker
paul gortmaker
3
0.17%
1
1.67%
thomas gleixner
thomas gleixner
1
0.06%
1
1.67%
Total
1774
100.00%
60
100.00%
  
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