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12#include <linux/kernel_stat.h>
13#include <linux/perf_event.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/sched/debug.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/types.h>
21#include <linux/ptrace.h>
22#include <linux/mman.h>
23#include <linux/mm.h>
24#include <linux/compat.h>
25#include <linux/smp.h>
26#include <linux/kdebug.h>
27#include <linux/init.h>
28#include <linux/console.h>
29#include <linux/extable.h>
30#include <linux/hardirq.h>
31#include <linux/kprobes.h>
32#include <linux/uaccess.h>
33#include <linux/hugetlb.h>
34#include <linux/kfence.h>
35#include <asm/asm-offsets.h>
36#include <asm/diag.h>
37#include <asm/gmap.h>
38#include <asm/irq.h>
39#include <asm/mmu_context.h>
40#include <asm/facility.h>
41#include <asm/uv.h>
42#include "../kernel/entry.h"
43
44#define __FAIL_ADDR_MASK -4096L
45#define __SUBCODE_MASK 0x0600
46#define __PF_RES_FIELD 0x8000000000000000ULL
47
48#define VM_FAULT_BADCONTEXT ((__force vm_fault_t) 0x010000)
49#define VM_FAULT_BADMAP ((__force vm_fault_t) 0x020000)
50#define VM_FAULT_BADACCESS ((__force vm_fault_t) 0x040000)
51#define VM_FAULT_SIGNAL ((__force vm_fault_t) 0x080000)
52#define VM_FAULT_PFAULT ((__force vm_fault_t) 0x100000)
53
54enum fault_type {
55 KERNEL_FAULT,
56 USER_FAULT,
57 GMAP_FAULT,
58};
59
60static unsigned long store_indication __read_mostly;
61
62static int __init fault_init(void)
63{
64 if (test_facility(75))
65 store_indication = 0xc00;
66 return 0;
67}
68early_initcall(fault_init);
69
70
71
72
73static enum fault_type get_fault_type(struct pt_regs *regs)
74{
75 unsigned long trans_exc_code;
76
77 trans_exc_code = regs->int_parm_long & 3;
78 if (likely(trans_exc_code == 0)) {
79
80 if (user_mode(regs))
81 return USER_FAULT;
82 if (!IS_ENABLED(CONFIG_PGSTE))
83 return KERNEL_FAULT;
84 if (test_pt_regs_flag(regs, PIF_GUEST_FAULT))
85 return GMAP_FAULT;
86 return KERNEL_FAULT;
87 }
88 if (trans_exc_code == 2)
89 return USER_FAULT;
90 if (trans_exc_code == 1) {
91
92 return USER_FAULT;
93 }
94
95 return KERNEL_FAULT;
96}
97
98static int bad_address(void *p)
99{
100 unsigned long dummy;
101
102 return get_kernel_nofault(dummy, (unsigned long *)p);
103}
104
105static void dump_pagetable(unsigned long asce, unsigned long address)
106{
107 unsigned long *table = __va(asce & _ASCE_ORIGIN);
108
109 pr_alert("AS:%016lx ", asce);
110 switch (asce & _ASCE_TYPE_MASK) {
111 case _ASCE_TYPE_REGION1:
112 table += (address & _REGION1_INDEX) >> _REGION1_SHIFT;
113 if (bad_address(table))
114 goto bad;
115 pr_cont("R1:%016lx ", *table);
116 if (*table & _REGION_ENTRY_INVALID)
117 goto out;
118 table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
119 fallthrough;
120 case _ASCE_TYPE_REGION2:
121 table += (address & _REGION2_INDEX) >> _REGION2_SHIFT;
122 if (bad_address(table))
123 goto bad;
124 pr_cont("R2:%016lx ", *table);
125 if (*table & _REGION_ENTRY_INVALID)
126 goto out;
127 table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
128 fallthrough;
129 case _ASCE_TYPE_REGION3:
130 table += (address & _REGION3_INDEX) >> _REGION3_SHIFT;
131 if (bad_address(table))
132 goto bad;
133 pr_cont("R3:%016lx ", *table);
134 if (*table & (_REGION_ENTRY_INVALID | _REGION3_ENTRY_LARGE))
135 goto out;
136 table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
137 fallthrough;
138 case _ASCE_TYPE_SEGMENT:
139 table += (address & _SEGMENT_INDEX) >> _SEGMENT_SHIFT;
140 if (bad_address(table))
141 goto bad;
142 pr_cont("S:%016lx ", *table);
143 if (*table & (_SEGMENT_ENTRY_INVALID | _SEGMENT_ENTRY_LARGE))
144 goto out;
145 table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
146 }
147 table += (address & _PAGE_INDEX) >> _PAGE_SHIFT;
148 if (bad_address(table))
149 goto bad;
150 pr_cont("P:%016lx ", *table);
151out:
152 pr_cont("\n");
153 return;
154bad:
155 pr_cont("BAD\n");
156}
157
158static void dump_fault_info(struct pt_regs *regs)
159{
160 unsigned long asce;
161
162 pr_alert("Failing address: %016lx TEID: %016lx\n",
163 regs->int_parm_long & __FAIL_ADDR_MASK, regs->int_parm_long);
164 pr_alert("Fault in ");
165 switch (regs->int_parm_long & 3) {
166 case 3:
167 pr_cont("home space ");
168 break;
169 case 2:
170 pr_cont("secondary space ");
171 break;
172 case 1:
173 pr_cont("access register ");
174 break;
175 case 0:
176 pr_cont("primary space ");
177 break;
178 }
179 pr_cont("mode while using ");
180 switch (get_fault_type(regs)) {
181 case USER_FAULT:
182 asce = S390_lowcore.user_asce;
183 pr_cont("user ");
184 break;
185 case GMAP_FAULT:
186 asce = ((struct gmap *) S390_lowcore.gmap)->asce;
187 pr_cont("gmap ");
188 break;
189 case KERNEL_FAULT:
190 asce = S390_lowcore.kernel_asce;
191 pr_cont("kernel ");
192 break;
193 default:
194 unreachable();
195 }
196 pr_cont("ASCE.\n");
197 dump_pagetable(asce, regs->int_parm_long & __FAIL_ADDR_MASK);
198}
199
200int show_unhandled_signals = 1;
201
202void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault)
203{
204 if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
205 return;
206 if (!unhandled_signal(current, signr))
207 return;
208 if (!printk_ratelimit())
209 return;
210 printk(KERN_ALERT "User process fault: interruption code %04x ilc:%d ",
211 regs->int_code & 0xffff, regs->int_code >> 17);
212 print_vma_addr(KERN_CONT "in ", regs->psw.addr);
213 printk(KERN_CONT "\n");
214 if (is_mm_fault)
215 dump_fault_info(regs);
216 show_regs(regs);
217}
218
219
220
221
222
223static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
224{
225 report_user_fault(regs, SIGSEGV, 1);
226 force_sig_fault(SIGSEGV, si_code,
227 (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK));
228}
229
230const struct exception_table_entry *s390_search_extables(unsigned long addr)
231{
232 const struct exception_table_entry *fixup;
233
234 fixup = search_extable(__start_amode31_ex_table,
235 __stop_amode31_ex_table - __start_amode31_ex_table,
236 addr);
237 if (!fixup)
238 fixup = search_exception_tables(addr);
239 return fixup;
240}
241
242static noinline void do_no_context(struct pt_regs *regs)
243{
244 const struct exception_table_entry *fixup;
245
246
247 fixup = s390_search_extables(regs->psw.addr);
248 if (fixup && ex_handle(fixup, regs))
249 return;
250
251
252
253
254
255 if (get_fault_type(regs) == KERNEL_FAULT)
256 printk(KERN_ALERT "Unable to handle kernel pointer dereference"
257 " in virtual kernel address space\n");
258 else
259 printk(KERN_ALERT "Unable to handle kernel paging request"
260 " in virtual user address space\n");
261 dump_fault_info(regs);
262 die(regs, "Oops");
263 do_exit(SIGKILL);
264}
265
266static noinline void do_low_address(struct pt_regs *regs)
267{
268
269
270 if (regs->psw.mask & PSW_MASK_PSTATE) {
271
272 die (regs, "Low-address protection");
273 do_exit(SIGKILL);
274 }
275
276 do_no_context(regs);
277}
278
279static noinline void do_sigbus(struct pt_regs *regs)
280{
281
282
283
284
285 force_sig_fault(SIGBUS, BUS_ADRERR,
286 (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK));
287}
288
289static noinline void do_fault_error(struct pt_regs *regs, int access,
290 vm_fault_t fault)
291{
292 int si_code;
293
294 switch (fault) {
295 case VM_FAULT_BADACCESS:
296 case VM_FAULT_BADMAP:
297
298 if (user_mode(regs)) {
299
300 si_code = (fault == VM_FAULT_BADMAP) ?
301 SEGV_MAPERR : SEGV_ACCERR;
302 do_sigsegv(regs, si_code);
303 break;
304 }
305 fallthrough;
306 case VM_FAULT_BADCONTEXT:
307 case VM_FAULT_PFAULT:
308 do_no_context(regs);
309 break;
310 case VM_FAULT_SIGNAL:
311 if (!user_mode(regs))
312 do_no_context(regs);
313 break;
314 default:
315 if (fault & VM_FAULT_OOM) {
316 if (!user_mode(regs))
317 do_no_context(regs);
318 else
319 pagefault_out_of_memory();
320 } else if (fault & VM_FAULT_SIGSEGV) {
321
322 if (!user_mode(regs))
323 do_no_context(regs);
324 else
325 do_sigsegv(regs, SEGV_MAPERR);
326 } else if (fault & VM_FAULT_SIGBUS) {
327
328 if (!user_mode(regs))
329 do_no_context(regs);
330 else
331 do_sigbus(regs);
332 } else
333 BUG();
334 break;
335 }
336}
337
338
339
340
341
342
343
344
345
346
347
348
349static inline vm_fault_t do_exception(struct pt_regs *regs, int access)
350{
351 struct gmap *gmap;
352 struct task_struct *tsk;
353 struct mm_struct *mm;
354 struct vm_area_struct *vma;
355 enum fault_type type;
356 unsigned long trans_exc_code;
357 unsigned long address;
358 unsigned int flags;
359 vm_fault_t fault;
360 bool is_write;
361
362 tsk = current;
363
364
365
366
367 clear_thread_flag(TIF_PER_TRAP);
368
369 if (kprobe_page_fault(regs, 14))
370 return 0;
371
372 mm = tsk->mm;
373 trans_exc_code = regs->int_parm_long;
374 address = trans_exc_code & __FAIL_ADDR_MASK;
375 is_write = (trans_exc_code & store_indication) == 0x400;
376
377
378
379
380
381
382 fault = VM_FAULT_BADCONTEXT;
383 type = get_fault_type(regs);
384 switch (type) {
385 case KERNEL_FAULT:
386 if (kfence_handle_page_fault(address, is_write, regs))
387 return 0;
388 goto out;
389 case USER_FAULT:
390 case GMAP_FAULT:
391 if (faulthandler_disabled() || !mm)
392 goto out;
393 break;
394 }
395
396 perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
397 flags = FAULT_FLAG_DEFAULT;
398 if (user_mode(regs))
399 flags |= FAULT_FLAG_USER;
400 if (access == VM_WRITE || is_write)
401 flags |= FAULT_FLAG_WRITE;
402 mmap_read_lock(mm);
403
404 gmap = NULL;
405 if (IS_ENABLED(CONFIG_PGSTE) && type == GMAP_FAULT) {
406 gmap = (struct gmap *) S390_lowcore.gmap;
407 current->thread.gmap_addr = address;
408 current->thread.gmap_write_flag = !!(flags & FAULT_FLAG_WRITE);
409 current->thread.gmap_int_code = regs->int_code & 0xffff;
410 address = __gmap_translate(gmap, address);
411 if (address == -EFAULT) {
412 fault = VM_FAULT_BADMAP;
413 goto out_up;
414 }
415 if (gmap->pfault_enabled)
416 flags |= FAULT_FLAG_RETRY_NOWAIT;
417 }
418
419retry:
420 fault = VM_FAULT_BADMAP;
421 vma = find_vma(mm, address);
422 if (!vma)
423 goto out_up;
424
425 if (unlikely(vma->vm_start > address)) {
426 if (!(vma->vm_flags & VM_GROWSDOWN))
427 goto out_up;
428 if (expand_stack(vma, address))
429 goto out_up;
430 }
431
432
433
434
435
436 fault = VM_FAULT_BADACCESS;
437 if (unlikely(!(vma->vm_flags & access)))
438 goto out_up;
439
440 if (is_vm_hugetlb_page(vma))
441 address &= HPAGE_MASK;
442
443
444
445
446
447 fault = handle_mm_fault(vma, address, flags, regs);
448 if (fault_signal_pending(fault, regs)) {
449 fault = VM_FAULT_SIGNAL;
450 if (flags & FAULT_FLAG_RETRY_NOWAIT)
451 goto out_up;
452 goto out;
453 }
454 if (unlikely(fault & VM_FAULT_ERROR))
455 goto out_up;
456
457 if (flags & FAULT_FLAG_ALLOW_RETRY) {
458 if (fault & VM_FAULT_RETRY) {
459 if (IS_ENABLED(CONFIG_PGSTE) && gmap &&
460 (flags & FAULT_FLAG_RETRY_NOWAIT)) {
461
462
463 current->thread.gmap_pfault = 1;
464 fault = VM_FAULT_PFAULT;
465 goto out_up;
466 }
467 flags &= ~FAULT_FLAG_RETRY_NOWAIT;
468 flags |= FAULT_FLAG_TRIED;
469 mmap_read_lock(mm);
470 goto retry;
471 }
472 }
473 if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
474 address = __gmap_link(gmap, current->thread.gmap_addr,
475 address);
476 if (address == -EFAULT) {
477 fault = VM_FAULT_BADMAP;
478 goto out_up;
479 }
480 if (address == -ENOMEM) {
481 fault = VM_FAULT_OOM;
482 goto out_up;
483 }
484 }
485 fault = 0;
486out_up:
487 mmap_read_unlock(mm);
488out:
489 return fault;
490}
491
492void do_protection_exception(struct pt_regs *regs)
493{
494 unsigned long trans_exc_code;
495 int access;
496 vm_fault_t fault;
497
498 trans_exc_code = regs->int_parm_long;
499
500
501
502
503
504 if (!(regs->int_code & 0x200))
505 regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
506
507
508
509
510
511 if (unlikely(!(trans_exc_code & 4))) {
512 do_low_address(regs);
513 return;
514 }
515 if (unlikely(MACHINE_HAS_NX && (trans_exc_code & 0x80))) {
516 regs->int_parm_long = (trans_exc_code & ~PAGE_MASK) |
517 (regs->psw.addr & PAGE_MASK);
518 access = VM_EXEC;
519 fault = VM_FAULT_BADACCESS;
520 } else {
521 access = VM_WRITE;
522 fault = do_exception(regs, access);
523 }
524 if (unlikely(fault))
525 do_fault_error(regs, access, fault);
526}
527NOKPROBE_SYMBOL(do_protection_exception);
528
529void do_dat_exception(struct pt_regs *regs)
530{
531 int access;
532 vm_fault_t fault;
533
534 access = VM_ACCESS_FLAGS;
535 fault = do_exception(regs, access);
536 if (unlikely(fault))
537 do_fault_error(regs, access, fault);
538}
539NOKPROBE_SYMBOL(do_dat_exception);
540
541#ifdef CONFIG_PFAULT
542
543
544
545static int pfault_disable;
546
547static int __init nopfault(char *str)
548{
549 pfault_disable = 1;
550 return 1;
551}
552
553__setup("nopfault", nopfault);
554
555struct pfault_refbk {
556 u16 refdiagc;
557 u16 reffcode;
558 u16 refdwlen;
559 u16 refversn;
560 u64 refgaddr;
561 u64 refselmk;
562 u64 refcmpmk;
563 u64 reserved;
564} __attribute__ ((packed, aligned(8)));
565
566static struct pfault_refbk pfault_init_refbk = {
567 .refdiagc = 0x258,
568 .reffcode = 0,
569 .refdwlen = 5,
570 .refversn = 2,
571 .refgaddr = __LC_LPP,
572 .refselmk = 1ULL << 48,
573 .refcmpmk = 1ULL << 48,
574 .reserved = __PF_RES_FIELD
575};
576
577int pfault_init(void)
578{
579 int rc;
580
581 if (pfault_disable)
582 return -1;
583 diag_stat_inc(DIAG_STAT_X258);
584 asm volatile(
585 " diag %1,%0,0x258\n"
586 "0: j 2f\n"
587 "1: la %0,8\n"
588 "2:\n"
589 EX_TABLE(0b,1b)
590 : "=d" (rc)
591 : "a" (&pfault_init_refbk), "m" (pfault_init_refbk) : "cc");
592 return rc;
593}
594
595static struct pfault_refbk pfault_fini_refbk = {
596 .refdiagc = 0x258,
597 .reffcode = 1,
598 .refdwlen = 5,
599 .refversn = 2,
600};
601
602void pfault_fini(void)
603{
604
605 if (pfault_disable)
606 return;
607 diag_stat_inc(DIAG_STAT_X258);
608 asm volatile(
609 " diag %0,0,0x258\n"
610 "0: nopr %%r7\n"
611 EX_TABLE(0b,0b)
612 : : "a" (&pfault_fini_refbk), "m" (pfault_fini_refbk) : "cc");
613}
614
615static DEFINE_SPINLOCK(pfault_lock);
616static LIST_HEAD(pfault_list);
617
618#define PF_COMPLETE 0x0080
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641static void pfault_interrupt(struct ext_code ext_code,
642 unsigned int param32, unsigned long param64)
643{
644 struct task_struct *tsk;
645 __u16 subcode;
646 pid_t pid;
647
648
649
650
651
652
653 subcode = ext_code.subcode;
654 if ((subcode & 0xff00) != __SUBCODE_MASK)
655 return;
656 inc_irq_stat(IRQEXT_PFL);
657
658 pid = param64 & LPP_PID_MASK;
659 rcu_read_lock();
660 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
661 if (tsk)
662 get_task_struct(tsk);
663 rcu_read_unlock();
664 if (!tsk)
665 return;
666 spin_lock(&pfault_lock);
667 if (subcode & PF_COMPLETE) {
668
669 if (tsk->thread.pfault_wait == 1) {
670
671
672
673
674
675 tsk->thread.pfault_wait = 0;
676 list_del(&tsk->thread.list);
677 wake_up_process(tsk);
678 put_task_struct(tsk);
679 } else {
680
681
682
683
684
685
686
687 if (task_is_running(tsk))
688 tsk->thread.pfault_wait = -1;
689 }
690 } else {
691
692 if (WARN_ON_ONCE(tsk != current))
693 goto out;
694 if (tsk->thread.pfault_wait == 1) {
695
696 goto block;
697 } else if (tsk->thread.pfault_wait == -1) {
698
699
700
701 tsk->thread.pfault_wait = 0;
702 } else {
703
704
705
706
707
708 get_task_struct(tsk);
709 tsk->thread.pfault_wait = 1;
710 list_add(&tsk->thread.list, &pfault_list);
711block:
712
713
714
715 __set_current_state(TASK_UNINTERRUPTIBLE);
716 set_tsk_need_resched(tsk);
717 set_preempt_need_resched();
718 }
719 }
720out:
721 spin_unlock(&pfault_lock);
722 put_task_struct(tsk);
723}
724
725static int pfault_cpu_dead(unsigned int cpu)
726{
727 struct thread_struct *thread, *next;
728 struct task_struct *tsk;
729
730 spin_lock_irq(&pfault_lock);
731 list_for_each_entry_safe(thread, next, &pfault_list, list) {
732 thread->pfault_wait = 0;
733 list_del(&thread->list);
734 tsk = container_of(thread, struct task_struct, thread);
735 wake_up_process(tsk);
736 put_task_struct(tsk);
737 }
738 spin_unlock_irq(&pfault_lock);
739 return 0;
740}
741
742static int __init pfault_irq_init(void)
743{
744 int rc;
745
746 rc = register_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt);
747 if (rc)
748 goto out_extint;
749 rc = pfault_init() == 0 ? 0 : -EOPNOTSUPP;
750 if (rc)
751 goto out_pfault;
752 irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
753 cpuhp_setup_state_nocalls(CPUHP_S390_PFAULT_DEAD, "s390/pfault:dead",
754 NULL, pfault_cpu_dead);
755 return 0;
756
757out_pfault:
758 unregister_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt);
759out_extint:
760 pfault_disable = 1;
761 return rc;
762}
763early_initcall(pfault_irq_init);
764
765#endif
766
767#if IS_ENABLED(CONFIG_PGSTE)
768
769void do_secure_storage_access(struct pt_regs *regs)
770{
771 unsigned long addr = regs->int_parm_long & __FAIL_ADDR_MASK;
772 struct vm_area_struct *vma;
773 struct mm_struct *mm;
774 struct page *page;
775 int rc;
776
777
778
779
780
781
782
783
784 if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) &&
785 !test_bit_inv(61, ®s->int_parm_long)) {
786
787
788
789
790
791 if (user_mode(regs)) {
792 send_sig(SIGSEGV, current, 0);
793 return;
794 }
795
796
797
798
799
800 panic("Unexpected PGM 0x3d with TEID bit 61=0");
801 }
802
803 switch (get_fault_type(regs)) {
804 case USER_FAULT:
805 mm = current->mm;
806 mmap_read_lock(mm);
807 vma = find_vma(mm, addr);
808 if (!vma) {
809 mmap_read_unlock(mm);
810 do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP);
811 break;
812 }
813 page = follow_page(vma, addr, FOLL_WRITE | FOLL_GET);
814 if (IS_ERR_OR_NULL(page)) {
815 mmap_read_unlock(mm);
816 break;
817 }
818 if (arch_make_page_accessible(page))
819 send_sig(SIGSEGV, current, 0);
820 put_page(page);
821 mmap_read_unlock(mm);
822 break;
823 case KERNEL_FAULT:
824 page = phys_to_page(addr);
825 if (unlikely(!try_get_page(page)))
826 break;
827 rc = arch_make_page_accessible(page);
828 put_page(page);
829 if (rc)
830 BUG();
831 break;
832 case GMAP_FAULT:
833 default:
834 do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP);
835 WARN_ON_ONCE(1);
836 }
837}
838NOKPROBE_SYMBOL(do_secure_storage_access);
839
840void do_non_secure_storage_access(struct pt_regs *regs)
841{
842 unsigned long gaddr = regs->int_parm_long & __FAIL_ADDR_MASK;
843 struct gmap *gmap = (struct gmap *)S390_lowcore.gmap;
844
845 if (get_fault_type(regs) != GMAP_FAULT) {
846 do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP);
847 WARN_ON_ONCE(1);
848 return;
849 }
850
851 if (gmap_convert_to_secure(gmap, gaddr) == -EINVAL)
852 send_sig(SIGSEGV, current, 0);
853}
854NOKPROBE_SYMBOL(do_non_secure_storage_access);
855
856void do_secure_storage_violation(struct pt_regs *regs)
857{
858
859
860
861
862
863
864
865 printk_ratelimited(KERN_WARNING
866 "Secure storage violation in task: %s, pid %d\n",
867 current->comm, current->pid);
868 send_sig(SIGSEGV, current, 0);
869}
870
871#endif
872