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-rw-r--r--arch/s390/mm/fault.c40
1 files changed, 39 insertions, 1 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 7cd82575813d..44f0cda7e72e 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -25,10 +25,12 @@
25#include <linux/console.h> 25#include <linux/console.h>
26#include <linux/module.h> 26#include <linux/module.h>
27#include <linux/hardirq.h> 27#include <linux/hardirq.h>
28#include <linux/kprobes.h>
28 29
29#include <asm/system.h> 30#include <asm/system.h>
30#include <asm/uaccess.h> 31#include <asm/uaccess.h>
31#include <asm/pgtable.h> 32#include <asm/pgtable.h>
33#include <asm/kdebug.h>
32 34
33#ifndef CONFIG_64BIT 35#ifndef CONFIG_64BIT
34#define __FAIL_ADDR_MASK 0x7ffff000 36#define __FAIL_ADDR_MASK 0x7ffff000
@@ -48,6 +50,38 @@ extern int sysctl_userprocess_debug;
48 50
49extern void die(const char *,struct pt_regs *,long); 51extern void die(const char *,struct pt_regs *,long);
50 52
53#ifdef CONFIG_KPROBES
54ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
55int register_page_fault_notifier(struct notifier_block *nb)
56{
57 return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
58}
59
60int unregister_page_fault_notifier(struct notifier_block *nb)
61{
62 return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
63}
64
65static inline int notify_page_fault(enum die_val val, const char *str,
66 struct pt_regs *regs, long err, int trap, int sig)
67{
68 struct die_args args = {
69 .regs = regs,
70 .str = str,
71 .err = err,
72 .trapnr = trap,
73 .signr = sig
74 };
75 return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
76}
77#else
78static inline int notify_page_fault(enum die_val val, const char *str,
79 struct pt_regs *regs, long err, int trap, int sig)
80{
81 return NOTIFY_DONE;
82}
83#endif
84
51extern spinlock_t timerlist_lock; 85extern spinlock_t timerlist_lock;
52 86
53/* 87/*
@@ -159,7 +193,7 @@ static void do_sigsegv(struct pt_regs *regs, unsigned long error_code,
159 * 11 Page translation -> Not present (nullification) 193 * 11 Page translation -> Not present (nullification)
160 * 3b Region third trans. -> Not present (nullification) 194 * 3b Region third trans. -> Not present (nullification)
161 */ 195 */
162static inline void 196static inline void __kprobes
163do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection) 197do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
164{ 198{
165 struct task_struct *tsk; 199 struct task_struct *tsk;
@@ -173,6 +207,10 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
173 tsk = current; 207 tsk = current;
174 mm = tsk->mm; 208 mm = tsk->mm;
175 209
210 if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
211 SIGSEGV) == NOTIFY_STOP)
212 return;
213
176 /* 214 /*
177 * Check for low-address protection. This needs to be treated 215 * Check for low-address protection. This needs to be treated
178 * as a special case because the translation exception code 216 * as a special case because the translation exception code