ARM kprobes: add the kprobes hook to the page fault handler (25ce1dd7) · Commits · e / devices / android_kernel_sony_msm8994

arch/arm/mm/fault.c

+27 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@
		#include <linux/signal.h>
		#include <linux/mm.h>
		#include <linux/init.h>
		#include <linux/kprobes.h>

		#include <asm/system.h>
		#include <asm/pgtable.h>
		@@ -20,6 +21,29 @@

		#include "fault.h"


		#ifdef CONFIG_KPROBES
		static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
		{
		int ret = 0;

		if (!user_mode(regs)) {
		/* kprobe_running() needs smp_processor_id() */
		preempt_disable();
		if (kprobe_running() && kprobe_fault_handler(regs, fsr))
		ret = 1;
		preempt_enable();
		}

		return ret;
		}
		#else
		static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
		{
		return 0;
		}
		#endif

		/*
		* This is useful to dump out the page tables associated with
		* 'addr' in mm 'mm'.
		@@ -222,6 +246,9 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
		struct mm_struct *mm;
		int fault, sig, code;

		if (notify_page_fault(regs, fsr))
		return 0;

		tsk = current;
		mm = tsk->mm;