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[PATCH] Kprobe: multi kprobe posthandler for booster

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If there are multi kprobes on the same probepoint, there will be one extra
aggr_kprobe on the head of kprobe list.  The aggr_kprobe has
aggr_post_handler/aggr_break_handler whether the other kprobe
post_hander/break_handler is NULL or not.  This patch modifies this, only
when there is one or more kprobe in the list whose post_handler is not
NULL, post_handler of aggr_kprobe will be set as aggr_post_handler.

[[email protected]: !CONFIG_PREEMPT fix]
Signed-off-by: bibo, mao <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: "Keshavamurthy, Anil S" <[email protected]>
Cc: Prasanna S Panchamukhi <[email protected]>
Cc: Jim Keniston <[email protected]>
Cc: Yumiko Sugita <[email protected]>
Cc: Hideo Aoki <[email protected]>
Signed-off-by: Satoshi Oshima <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
mao, bibo 2006-06-26 00:25:22 -07:00 • committed by Linus Torvalds
commit 3672165677
2 changed files with 29 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

32
kernel/kprobes.c
View file

@ -368,16 +368,15 @@ static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)
*/
static int __kprobes add_new_kprobe(struct kprobe *old_p, struct kprobe *p)
{
struct kprobe *kp;
if (p->break_handler) {
list_for_each_entry_rcu(kp, &old_p->list, list) {
if (kp->break_handler)
return -EEXIST;
}
if (old_p->break_handler)
return -EEXIST;
list_add_tail_rcu(&p->list, &old_p->list);
old_p->break_handler = aggr_break_handler;
} else
list_add_rcu(&p->list, &old_p->list);
if (p->post_handler && !old_p->post_handler)
old_p->post_handler = aggr_post_handler;
return 0;
}
@ -390,9 +389,11 @@ static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
copy_kprobe(p, ap);
ap->addr = p->addr;
ap->pre_handler = aggr_pre_handler;
ap->post_handler = aggr_post_handler;
ap->fault_handler = aggr_fault_handler;
ap->break_handler = aggr_break_handler;
if (p->post_handler)
ap->post_handler = aggr_post_handler;
if (p->break_handler)
ap->break_handler = aggr_break_handler;
INIT_LIST_HEAD(&ap->list);
list_add_rcu(&p->list, &ap->list);
@ -536,6 +537,21 @@ valid_p:
kfree(old_p);
}
arch_remove_kprobe(p);
} else {
mutex_lock(&kprobe_mutex);
if (p->break_handler)
old_p->break_handler = NULL;
if (p->post_handler){
list_for_each_entry_rcu(list_p, &old_p->list, list){
if (list_p->post_handler){
cleanup_p = 2;
break;
}
}
if (cleanup_p == 0)
old_p->post_handler = NULL;
}
mutex_unlock(&kprobe_mutex);
}
}