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kprobes: add (un)register_kretprobes for batch registration

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Introduce unregister_/register_kretprobes() for kretprobe batch registration.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masami Hiramatsu 2008-04-28 02:14:29 -07:00 committed by Linus Torvalds
parent 9861668f74
commit 4a296e07c3
2 changed files with 98 additions and 21 deletions
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9
include/linux/kprobes.h
View file

@ -245,6 +245,8 @@ 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);
@ -287,9 +289,16 @@ static inline int register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
}
static inline int register_kretprobes(struct kretprobe **rps, int num)
{
return -ENOSYS;
}
static inline void unregister_kretprobe(struct kretprobe *rp)
{
}
static inline void unregister_kretprobes(struct kretprobe **rps, int num)
{
}
static inline void kprobe_flush_task(struct task_struct *tk)
{
}

110
kernel/kprobes.c
View file

@ -429,6 +429,21 @@ static inline void free_rp_inst(struct kretprobe *rp)
}
}
static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
{
unsigned long flags;
struct kretprobe_instance *ri;
struct hlist_node *pos, *next;
/* No race here */
spin_lock_irqsave(&kretprobe_lock, flags);
hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) {
ri->rp = NULL;
hlist_del(&ri->uflist);
}
spin_unlock_irqrestore(&kretprobe_lock, flags);
free_rp_inst(rp);
}
/*
* Keep all fields in the kprobe consistent
*/
@ -798,7 +813,8 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
return 0;
}
int __kprobes register_kretprobe(struct kretprobe *rp)
static int __kprobes __register_kretprobe(struct kretprobe *rp,
unsigned long called_from)
{
int ret = 0;
struct kretprobe_instance *inst;
@ -844,43 +860,93 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
rp->nmissed = 0;
/* Establish function entry probe point */
if ((ret = __register_kprobe(&rp->kp,
(unsigned long)__builtin_return_address(0))) != 0)
ret = __register_kprobe(&rp->kp, called_from);
if (ret != 0)
free_rp_inst(rp);
return ret;
}
static int __register_kretprobes(struct kretprobe **rps, int num,
unsigned long called_from)
{
int ret = 0, i;
if (num <= 0)
return -EINVAL;
for (i = 0; i < num; i++) {
ret = __register_kretprobe(rps[i], called_from);
if (ret < 0 && i > 0) {
unregister_kretprobes(rps, i);
break;
}
}
return ret;
}
int __kprobes register_kretprobe(struct kretprobe *rp)
{
return __register_kretprobes(&rp, 1,
(unsigned long)__builtin_return_address(0));
}
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{
unregister_kretprobes(&rp, 1);
}
int __kprobes register_kretprobes(struct kretprobe **rps, int num)
{
return __register_kretprobes(rps, num,
(unsigned long)__builtin_return_address(0));
}
void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
{
int i;
if (num <= 0)
return;
mutex_lock(&kprobe_mutex);
for (i = 0; i < num; i++)
if (__unregister_kprobe_top(&rps[i]->kp) < 0)
rps[i]->kp.addr = NULL;
mutex_unlock(&kprobe_mutex);
synchronize_sched();
for (i = 0; i < num; i++) {
if (rps[i]->kp.addr) {
__unregister_kprobe_bottom(&rps[i]->kp);
cleanup_rp_inst(rps[i]);
}
}
}
#else /* CONFIG_KRETPROBES */
int __kprobes register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
}
int __kprobes register_kretprobes(struct kretprobe **rps, int num)
{
return -ENOSYS;
}
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{
}
void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
{
}
static int __kprobes pre_handler_kretprobe(struct kprobe *p,
struct pt_regs *regs)
{
return 0;
}
#endif /* CONFIG_KRETPROBES */
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{
unsigned long flags;
struct kretprobe_instance *ri;
struct hlist_node *pos, *next;
unregister_kprobe(&rp->kp);
/* No race here */
spin_lock_irqsave(&kretprobe_lock, flags);
hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) {
ri->rp = NULL;
hlist_del(&ri->uflist);
}
spin_unlock_irqrestore(&kretprobe_lock, flags);
free_rp_inst(rp);
}
static int __init init_kprobes(void)
{
int i, err = 0;
@ -1177,4 +1243,6 @@ EXPORT_SYMBOL_GPL(jprobe_return);
#ifdef CONFIG_KPROBES
EXPORT_SYMBOL_GPL(register_kretprobe);
EXPORT_SYMBOL_GPL(unregister_kretprobe);
EXPORT_SYMBOL_GPL(register_kretprobes);
EXPORT_SYMBOL_GPL(unregister_kretprobes);
#endif