Commit dbf58062 authored Jul 07, 2017 by Naveen N. Rao Committed by Ingo Molnar Jul 08, 2017

kprobes: Ensure that jprobe probepoints are at function entry

Similar to commit 90ec5e89 ("kretprobes: Ensure probe location is
at function entry"), ensure that the jprobe probepoint is at function
entry.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a4525af6c5a42df385efa31251246cf7cca73598.1499443367.git.naveen.n.rao@linux.vnet.ibm.com

Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 0f73ff80

kernel/kprobes.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -1795,10 +1795,14 @@ int register_jprobe(struct jprobe *jp)
		unsigned long addr, offset;
		struct kprobe *kp = &jp->kp;

		/* Verify probepoint is a function entry point */
		/*
		* Verify probepoint as well as the jprobe handler are
		* valid function entry points.
		*/
		addr = arch_deref_entry_point(jp->entry);

		if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0) {
		if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0 &&
		kprobe_on_func_entry(kp->addr, kp->symbol_name, kp->offset)) {
		kp->pre_handler = setjmp_pre_handler;
		kp->break_handler = longjmp_break_handler;
		return register_kprobe(kp);

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