Commit 8b0914ea authored by Prasanna S Panchamukhi's avatar Prasanna S Panchamukhi Committed by Linus Torvalds
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[PATCH] jprobes: allow a jprobe to coexist with muliple kprobes 



Presently either multiple kprobes or only one jprobe could be inserted.
This patch removes the above limitation and allows one jprobe and multiple
kprobes to coexist at the same address.  However multiple jprobes cannot
coexist with multiple kprobes.  Currently I am working on the prototype to
allow multiple jprobes coexist with multiple kprobes.

Signed-off-by: default avatarAnanth N Mavinakayanhalli <amavin@redhat.com>
Signed-off-by: default avatarPrasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 852caccc

kernel/kprobes.c

+51 −10
Original line number Diff line number Diff line
@@ -89,9 +89,10 @@ static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs) 
	list_for_each_entry(kp, &p->list, list) {

		if (kp->pre_handler) {

			curr_kprobe = kp;

			kp->pre_handler(kp, regs);

			curr_kprobe = NULL;

			if (kp->pre_handler(kp, regs))

				return 1;

		}

		curr_kprobe = NULL;

	}

	return 0;

}
@@ -125,6 +126,19 @@ static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs, 
	return 0;

}



static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)

{

	struct kprobe *kp = curr_kprobe;

	if (curr_kprobe && kp->break_handler) {

		if (kp->break_handler(kp, regs)) {

			curr_kprobe = NULL;

			return 1;

		}

	}

	curr_kprobe = NULL;

	return 0;

}



struct kprobe trampoline_p = {

		.addr = (kprobe_opcode_t *) &kretprobe_trampoline,

		.pre_handler = trampoline_probe_handler,
@@ -257,19 +271,46 @@ static inline void free_rp_inst(struct kretprobe *rp) 
	}

}



/*

 * Keep all fields in the kprobe consistent

 */

static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)

{

	memcpy(&p->opcode, &old_p->opcode, sizeof(kprobe_opcode_t));

	memcpy(&p->ainsn, &old_p->ainsn, sizeof(struct arch_specific_insn));

}



/*

* Add the new probe to old_p->list. Fail if this is the

* second jprobe at the address - two jprobes can't coexist

*/

static int add_new_kprobe(struct kprobe *old_p, struct kprobe *p)

{

        struct kprobe *kp;



	if (p->break_handler) {

		list_for_each_entry(kp, &old_p->list, list) {

			if (kp->break_handler)

				return -EEXIST;

		}

		list_add_tail(&p->list, &old_p->list);

	} else

		list_add(&p->list, &old_p->list);

	return 0;

}



/*

 * Fill in the required fields of the "manager kprobe". Replace the

 * earlier kprobe in the hlist with the manager kprobe

 */

static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)

{

	copy_kprobe(p, ap);

	ap->addr = p->addr;

	memcpy(&ap->opcode, &p->opcode, sizeof(kprobe_opcode_t));

	memcpy(&ap->ainsn, &p->ainsn, sizeof(struct arch_specific_insn));



	ap->pre_handler = aggr_pre_handler;

	ap->post_handler = aggr_post_handler;

	ap->fault_handler = aggr_fault_handler;

	ap->break_handler = aggr_break_handler;



	INIT_LIST_HEAD(&ap->list);

	list_add(&p->list, &ap->list);
@@ -290,16 +331,16 @@ static int register_aggr_kprobe(struct kprobe *old_p, struct kprobe *p) 
	int ret = 0;

	struct kprobe *ap;



	if (old_p->break_handler || p->break_handler) {

		ret = -EEXIST;	/* kprobe and jprobe can't (yet) coexist */

	} else if (old_p->pre_handler == aggr_pre_handler) {

		list_add(&p->list, &old_p->list);

	if (old_p->pre_handler == aggr_pre_handler) {

		copy_kprobe(old_p, p);

		ret = add_new_kprobe(old_p, p);

	} else {

		ap = kcalloc(1, sizeof(struct kprobe), GFP_ATOMIC);

		if (!ap)

			return -ENOMEM;

		add_aggr_kprobe(ap, old_p);

		list_add(&p->list, &ap->list);

		copy_kprobe(ap, p);

		ret = add_new_kprobe(ap, p);

	}

	return ret;

}

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