diff options
Diffstat (limited to 'arch/arm/mm/fault.c')
| -rw-r--r-- | arch/arm/mm/fault.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index a8a7dab757eb..28ad7ab1c0cd 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -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'. @@ -215,13 +239,16 @@ out: return fault; } -static int +static int __kprobes do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { struct task_struct *tsk; struct mm_struct *mm; int fault, sig, code; + if (notify_page_fault(regs, fsr)) + return 0; + tsk = current; mm = tsk->mm; @@ -311,7 +338,7 @@ no_context: * interrupt or a critical region, and should only copy the information * from the master page table, nothing more. */ -static int +static int __kprobes do_translation_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { |