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kprobes: remove called_from argument 

Remove called_from argument from kprobes which had been used for
preventing self-refering of kernel module.  However, since we don't keep
module's refcount after registering kprobe any more, there is no reason to
check that.

This patch also simplifies registering/unregistering functions because we
don't need to use __builtin_return_address(0) which was passed to
called_from.

[ananth@in.ibm.com: build fix]
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.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 2009-01-06 14:41:53 -08:00 committed by Linus Torvalds
parent e8386a0cb2
commit 49ad2fd76c
1 changed files with 14 additions and 58 deletions
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72
kernel/kprobes.c
View File

@ -644,8 +644,7 @@ static kprobe_opcode_t __kprobes *kprobe_addr(struct kprobe *p)
return (kprobe_opcode_t *)(((char *)addr) + p->offset);
}
static int __kprobes __register_kprobe(struct kprobe *p,
unsigned long called_from)
int __kprobes register_kprobe(struct kprobe *p)
{
int ret = 0;
struct kprobe *old_p;
@ -670,19 +669,14 @@ static int __kprobes __register_kprobe(struct kprobe *p,
*/
probed_mod = __module_text_address((unsigned long) p->addr);
if (probed_mod) {
struct module *calling_mod;
calling_mod = __module_text_address(called_from);
/*
* We must hold a refcount of the probed module while updating
* its code to prohibit unexpected unloading.
*/
if (calling_mod != probed_mod) {
if (unlikely(!try_module_get(probed_mod))) {
preempt_enable();
return -EINVAL;
}
} else
probed_mod = NULL;
if (unlikely(!try_module_get(probed_mod))) {
preempt_enable();
return -EINVAL;
}
}
preempt_enable();
@ -776,15 +770,14 @@ static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
}
}
static int __kprobes __register_kprobes(struct kprobe **kps, int num,
unsigned long called_from)
int __kprobes register_kprobes(struct kprobe **kps, int num)
{
int i, ret = 0;
if (num <= 0)
return -EINVAL;
for (i = 0; i < num; i++) {
ret = __register_kprobe(kps[i], called_from);
ret = register_kprobe(kps[i]);
if (ret < 0) {
if (i > 0)
unregister_kprobes(kps, i);
@ -794,26 +787,11 @@ static int __kprobes __register_kprobes(struct kprobe **kps, int num,
return ret;
}
/*
* Registration and unregistration functions for kprobe.
*/
int __kprobes register_kprobe(struct kprobe *p)
{
return __register_kprobes(&p, 1,
(unsigned long)__builtin_return_address(0));
}
void __kprobes unregister_kprobe(struct kprobe *p)
{
unregister_kprobes(&p, 1);
}
int __kprobes register_kprobes(struct kprobe **kps, int num)
{
return __register_kprobes(kps, num,
(unsigned long)__builtin_return_address(0));
}
void __kprobes unregister_kprobes(struct kprobe **kps, int num)
{
int i;
@ -842,8 +820,7 @@ unsigned long __weak arch_deref_entry_point(void *entry)
return (unsigned long)entry;
}
static int __kprobes __register_jprobes(struct jprobe **jps, int num,
unsigned long called_from)
int __kprobes register_jprobes(struct jprobe **jps, int num)
{
struct jprobe *jp;
int ret = 0, i;
@ -861,7 +838,7 @@ static int __kprobes __register_jprobes(struct jprobe **jps, int num,
/* Todo: Verify probepoint is a function entry point */
jp->kp.pre_handler = setjmp_pre_handler;
jp->kp.break_handler = longjmp_break_handler;
ret = __register_kprobe(&jp->kp, called_from);
ret = register_kprobe(&jp->kp);
}
if (ret < 0) {
if (i > 0)
@ -874,8 +851,7 @@ static int __kprobes __register_jprobes(struct jprobe **jps, int num,
int __kprobes register_jprobe(struct jprobe *jp)
{
return __register_jprobes(&jp, 1,
(unsigned long)__builtin_return_address(0));
return register_jprobes(&jp, 1);
}
void __kprobes unregister_jprobe(struct jprobe *jp)
@ -883,12 +859,6 @@ void __kprobes unregister_jprobe(struct jprobe *jp)
unregister_jprobes(&jp, 1);
}
int __kprobes register_jprobes(struct jprobe **jps, int num)
{
return __register_jprobes(jps, num,
(unsigned long)__builtin_return_address(0));
}
void __kprobes unregister_jprobes(struct jprobe **jps, int num)
{
int i;
@ -951,8 +921,7 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
return 0;
}
static int __kprobes __register_kretprobe(struct kretprobe *rp,
unsigned long called_from)
int __kprobes register_kretprobe(struct kretprobe *rp)
{
int ret = 0;
struct kretprobe_instance *inst;
@ -998,21 +967,20 @@ static int __kprobes __register_kretprobe(struct kretprobe *rp,
rp->nmissed = 0;
/* Establish function entry probe point */
ret = __register_kprobe(&rp->kp, called_from);
ret = register_kprobe(&rp->kp);
if (ret != 0)
free_rp_inst(rp);
return ret;
}
static int __kprobes __register_kretprobes(struct kretprobe **rps, int num,
unsigned long called_from)
int __kprobes register_kretprobes(struct kretprobe **rps, int num)
{
int ret = 0, i;
if (num <= 0)
return -EINVAL;
for (i = 0; i < num; i++) {
ret = __register_kretprobe(rps[i], called_from);
ret = register_kretprobe(rps[i]);
if (ret < 0) {
if (i > 0)
unregister_kretprobes(rps, i);
@ -1022,23 +990,11 @@ static int __kprobes __register_kretprobes(struct kretprobe **rps, int num,
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;