Commit ea32c65c authored Jun 23, 2005 by Prasanna S Panchamukhi Committed by Linus Torvalds Jun 23, 2005

[PATCH] kprobes: Temporary disarming of reentrant probe

In situations where a kprobes handler calls a routine which has a probe on it,
then kprobes_handler() disarms the new probe forever. This patch removes the
above limitation by temporarily disarming the new probe. When the another
probe hits while handling the old probe, the kprobes_handler() saves previous
kprobes state and handles the new probe without calling the new kprobes
registered handlers. kprobe_post_handler() restores back the previous kprobes
state and the normal execution continues.

However on x86_64 architecture, re-rentrancy is provided only through
pre_handler(). If a routine having probe is referenced through
post_handler(), then the probes on that routine are disarmed forever, since
the exception stack is gets changed after the processor single steps the
instruction of the new probe.

This patch includes generic changes to support temporary disarming on
reentrancy of probes.

Signed-of-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent 89cb14c0

include/linux/kprobes.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,12 @@

		#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

		struct kprobe;
		struct pt_regs;
		struct kretprobe;
		@@ -55,6 +61,9 @@ struct kprobe {
		/* 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;

kernel/kprobes.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -335,6 +335,7 @@ int register_kprobe(struct kprobe *p)
		}
		spin_lock_irqsave(&kprobe_lock, flags);
		old_p = get_kprobe(p->addr);
		p->nmissed = 0;
		if (old_p) {
		ret = register_aggr_kprobe(old_p, p);
		goto out;

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