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13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/errno.h>
17#include <linux/ptrace.h>
18#include <linux/user.h>
19#include <linux/smp.h>
20#include <linux/smp_lock.h>
21#include <linux/security.h>
22#include <linux/seccomp.h>
23#include <linux/audit.h>
24#include <linux/signal.h>
25
26#include <asm/asi.h>
27#include <asm/pgtable.h>
28#include <asm/system.h>
29#include <asm/uaccess.h>
30#include <asm/psrcompat.h>
31#include <asm/visasm.h>
32#include <asm/spitfire.h>
33#include <asm/page.h>
34#include <asm/cpudata.h>
35
36
37
38
39
40
41static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
42{
43 regs->u_regs[UREG_I0] = error;
44 regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
45 regs->tpc = regs->tnpc;
46 regs->tnpc += 4;
47}
48
49static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
50{
51 regs->u_regs[UREG_I0] = value;
52 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
53 regs->tpc = regs->tnpc;
54 regs->tnpc += 4;
55}
56
57static inline void
58pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
59{
60 if (test_thread_flag(TIF_32BIT)) {
61 if (put_user(value, (unsigned int __user *) addr)) {
62 pt_error_return(regs, EFAULT);
63 return;
64 }
65 } else {
66 if (put_user(value, (long __user *) addr)) {
67 pt_error_return(regs, EFAULT);
68 return;
69 }
70 }
71 regs->u_regs[UREG_I0] = 0;
72 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
73 regs->tpc = regs->tnpc;
74 regs->tnpc += 4;
75}
76
77static void
78pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
79{
80 if (current->personality == PER_SUNOS)
81 pt_succ_return (regs, val);
82 else
83 pt_succ_return_linux (regs, val, addr);
84}
85
86
87
88
89#ifdef DEBUG_PTRACE
90char *pt_rq [] = {
91 "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
92 "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
93 "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
94 "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
95 "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
96 "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
97 "SYSCALL", ""
98};
99#endif
100
101
102
103
104
105
106void ptrace_disable(struct task_struct *child)
107{
108
109}
110
111
112
113
114
115
116
117
118
119
120
121void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
122 unsigned long uaddr, void *kaddr,
123 unsigned long len, int write)
124{
125 BUG_ON(len > PAGE_SIZE);
126
127 if (tlb_type == hypervisor)
128 return;
129
130#ifdef DCACHE_ALIASING_POSSIBLE
131
132
133
134
135
136 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
137 unsigned long start = __pa(kaddr);
138 unsigned long end = start + len;
139 unsigned long dcache_line_size;
140
141 dcache_line_size = local_cpu_data().dcache_line_size;
142
143 if (tlb_type == spitfire) {
144 for (; start < end; start += dcache_line_size)
145 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
146 } else {
147 start &= ~(dcache_line_size - 1);
148 for (; start < end; start += dcache_line_size)
149 __asm__ __volatile__(
150 "stxa %%g0, [%0] %1\n\t"
151 "membar #Sync"
152 :
153 : "r" (start),
154 "i" (ASI_DCACHE_INVALIDATE));
155 }
156 }
157#endif
158 if (write && tlb_type == spitfire) {
159 unsigned long start = (unsigned long) kaddr;
160 unsigned long end = start + len;
161 unsigned long icache_line_size;
162
163 icache_line_size = local_cpu_data().icache_line_size;
164
165 for (; start < end; start += icache_line_size)
166 flushi(start);
167 }
168}
169
170asmlinkage void do_ptrace(struct pt_regs *regs)
171{
172 int request = regs->u_regs[UREG_I0];
173 pid_t pid = regs->u_regs[UREG_I1];
174 unsigned long addr = regs->u_regs[UREG_I2];
175 unsigned long data = regs->u_regs[UREG_I3];
176 unsigned long addr2 = regs->u_regs[UREG_I4];
177 struct task_struct *child;
178 int ret;
179
180 if (test_thread_flag(TIF_32BIT)) {
181 addr &= 0xffffffffUL;
182 data &= 0xffffffffUL;
183 addr2 &= 0xffffffffUL;
184 }
185 lock_kernel();
186#ifdef DEBUG_PTRACE
187 {
188 char *s;
189
190 if ((request >= 0) && (request <= 24))
191 s = pt_rq [request];
192 else
193 s = "unknown";
194
195 if (request == PTRACE_POKEDATA && data == 0x91d02001){
196 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
197 pid, addr, addr2);
198 } else
199 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
200 s, request, pid, addr, data, addr2);
201 }
202#endif
203 if (request == PTRACE_TRACEME) {
204 ret = ptrace_traceme();
205 if (ret < 0)
206 pt_error_return(regs, -ret);
207 else
208 pt_succ_return(regs, 0);
209 goto out;
210 }
211
212 child = ptrace_get_task_struct(pid);
213 if (IS_ERR(child)) {
214 ret = PTR_ERR(child);
215 pt_error_return(regs, -ret);
216 goto out;
217 }
218
219 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
220 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
221 if (ptrace_attach(child)) {
222 pt_error_return(regs, EPERM);
223 goto out_tsk;
224 }
225 pt_succ_return(regs, 0);
226 goto out_tsk;
227 }
228
229 ret = ptrace_check_attach(child, request == PTRACE_KILL);
230 if (ret < 0) {
231 pt_error_return(regs, -ret);
232 goto out_tsk;
233 }
234
235 if (!(test_thread_flag(TIF_32BIT)) &&
236 ((request == PTRACE_READDATA64) ||
237 (request == PTRACE_WRITEDATA64) ||
238 (request == PTRACE_READTEXT64) ||
239 (request == PTRACE_WRITETEXT64) ||
240 (request == PTRACE_PEEKTEXT64) ||
241 (request == PTRACE_POKETEXT64) ||
242 (request == PTRACE_PEEKDATA64) ||
243 (request == PTRACE_POKEDATA64))) {
244 addr = regs->u_regs[UREG_G2];
245 addr2 = regs->u_regs[UREG_G3];
246 request -= 30;
247 }
248
249 switch(request) {
250 case PTRACE_PEEKUSR:
251 if (addr != 0)
252 pt_error_return(regs, EIO);
253 else
254 pt_succ_return(regs, 0);
255 goto out_tsk;
256
257 case PTRACE_PEEKTEXT:
258 case PTRACE_PEEKDATA: {
259 unsigned long tmp64;
260 unsigned int tmp32;
261 int res, copied;
262
263 res = -EIO;
264 if (test_thread_flag(TIF_32BIT)) {
265 copied = access_process_vm(child, addr,
266 &tmp32, sizeof(tmp32), 0);
267 tmp64 = (unsigned long) tmp32;
268 if (copied == sizeof(tmp32))
269 res = 0;
270 } else {
271 copied = access_process_vm(child, addr,
272 &tmp64, sizeof(tmp64), 0);
273 if (copied == sizeof(tmp64))
274 res = 0;
275 }
276 if (res < 0)
277 pt_error_return(regs, -res);
278 else
279 pt_os_succ_return(regs, tmp64, (void __user *) data);
280 goto out_tsk;
281 }
282
283 case PTRACE_POKETEXT:
284 case PTRACE_POKEDATA: {
285 unsigned long tmp64;
286 unsigned int tmp32;
287 int copied, res = -EIO;
288
289 if (test_thread_flag(TIF_32BIT)) {
290 tmp32 = data;
291 copied = access_process_vm(child, addr,
292 &tmp32, sizeof(tmp32), 1);
293 if (copied == sizeof(tmp32))
294 res = 0;
295 } else {
296 tmp64 = data;
297 copied = access_process_vm(child, addr,
298 &tmp64, sizeof(tmp64), 1);
299 if (copied == sizeof(tmp64))
300 res = 0;
301 }
302 if (res < 0)
303 pt_error_return(regs, -res);
304 else
305 pt_succ_return(regs, res);
306 goto out_tsk;
307 }
308
309 case PTRACE_GETREGS: {
310 struct pt_regs32 __user *pregs =
311 (struct pt_regs32 __user *) addr;
312 struct pt_regs *cregs = task_pt_regs(child);
313 int rval;
314
315 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
316 __put_user(cregs->tpc, (&pregs->pc)) ||
317 __put_user(cregs->tnpc, (&pregs->npc)) ||
318 __put_user(cregs->y, (&pregs->y))) {
319 pt_error_return(regs, EFAULT);
320 goto out_tsk;
321 }
322 for (rval = 1; rval < 16; rval++)
323 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
324 pt_error_return(regs, EFAULT);
325 goto out_tsk;
326 }
327 pt_succ_return(regs, 0);
328#ifdef DEBUG_PTRACE
329 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
330#endif
331 goto out_tsk;
332 }
333
334 case PTRACE_GETREGS64: {
335 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
336 struct pt_regs *cregs = task_pt_regs(child);
337 unsigned long tpc = cregs->tpc;
338 int rval;
339
340 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
341 tpc &= 0xffffffff;
342 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
343 __put_user(tpc, (&pregs->tpc)) ||
344 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
345 __put_user(cregs->y, (&pregs->y))) {
346 pt_error_return(regs, EFAULT);
347 goto out_tsk;
348 }
349 for (rval = 1; rval < 16; rval++)
350 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
351 pt_error_return(regs, EFAULT);
352 goto out_tsk;
353 }
354 pt_succ_return(regs, 0);
355#ifdef DEBUG_PTRACE
356 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
357#endif
358 goto out_tsk;
359 }
360
361 case PTRACE_SETREGS: {
362 struct pt_regs32 __user *pregs =
363 (struct pt_regs32 __user *) addr;
364 struct pt_regs *cregs = task_pt_regs(child);
365 unsigned int psr, pc, npc, y;
366 int i;
367
368
369
370
371 if (__get_user(psr, (&pregs->psr)) ||
372 __get_user(pc, (&pregs->pc)) ||
373 __get_user(npc, (&pregs->npc)) ||
374 __get_user(y, (&pregs->y))) {
375 pt_error_return(regs, EFAULT);
376 goto out_tsk;
377 }
378 cregs->tstate &= ~(TSTATE_ICC);
379 cregs->tstate |= psr_to_tstate_icc(psr);
380 if (!((pc | npc) & 3)) {
381 cregs->tpc = pc;
382 cregs->tnpc = npc;
383 }
384 cregs->y = y;
385 for (i = 1; i < 16; i++) {
386 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
387 pt_error_return(regs, EFAULT);
388 goto out_tsk;
389 }
390 }
391 pt_succ_return(regs, 0);
392 goto out_tsk;
393 }
394
395 case PTRACE_SETREGS64: {
396 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
397 struct pt_regs *cregs = task_pt_regs(child);
398 unsigned long tstate, tpc, tnpc, y;
399 int i;
400
401
402
403
404 if (__get_user(tstate, (&pregs->tstate)) ||
405 __get_user(tpc, (&pregs->tpc)) ||
406 __get_user(tnpc, (&pregs->tnpc)) ||
407 __get_user(y, (&pregs->y))) {
408 pt_error_return(regs, EFAULT);
409 goto out_tsk;
410 }
411 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
412 tpc &= 0xffffffff;
413 tnpc &= 0xffffffff;
414 }
415 tstate &= (TSTATE_ICC | TSTATE_XCC);
416 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
417 cregs->tstate |= tstate;
418 if (!((tpc | tnpc) & 3)) {
419 cregs->tpc = tpc;
420 cregs->tnpc = tnpc;
421 }
422 cregs->y = y;
423 for (i = 1; i < 16; i++) {
424 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
425 pt_error_return(regs, EFAULT);
426 goto out_tsk;
427 }
428 }
429 pt_succ_return(regs, 0);
430 goto out_tsk;
431 }
432
433 case PTRACE_GETFPREGS: {
434 struct fps {
435 unsigned int regs[32];
436 unsigned int fsr;
437 unsigned int flags;
438 unsigned int extra;
439 unsigned int fpqd;
440 struct fq {
441 unsigned int insnaddr;
442 unsigned int insn;
443 } fpq[16];
444 };
445 struct fps __user *fps = (struct fps __user *) addr;
446 unsigned long *fpregs = task_thread_info(child)->fpregs;
447
448 if (copy_to_user(&fps->regs[0], fpregs,
449 (32 * sizeof(unsigned int))) ||
450 __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) ||
451 __put_user(0, (&fps->fpqd)) ||
452 __put_user(0, (&fps->flags)) ||
453 __put_user(0, (&fps->extra)) ||
454 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
455 pt_error_return(regs, EFAULT);
456 goto out_tsk;
457 }
458 pt_succ_return(regs, 0);
459 goto out_tsk;
460 }
461
462 case PTRACE_GETFPREGS64: {
463 struct fps {
464 unsigned int regs[64];
465 unsigned long fsr;
466 };
467 struct fps __user *fps = (struct fps __user *) addr;
468 unsigned long *fpregs = task_thread_info(child)->fpregs;
469
470 if (copy_to_user(&fps->regs[0], fpregs,
471 (64 * sizeof(unsigned int))) ||
472 __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
473 pt_error_return(regs, EFAULT);
474 goto out_tsk;
475 }
476 pt_succ_return(regs, 0);
477 goto out_tsk;
478 }
479
480 case PTRACE_SETFPREGS: {
481 struct fps {
482 unsigned int regs[32];
483 unsigned int fsr;
484 unsigned int flags;
485 unsigned int extra;
486 unsigned int fpqd;
487 struct fq {
488 unsigned int insnaddr;
489 unsigned int insn;
490 } fpq[16];
491 };
492 struct fps __user *fps = (struct fps __user *) addr;
493 unsigned long *fpregs = task_thread_info(child)->fpregs;
494 unsigned fsr;
495
496 if (copy_from_user(fpregs, &fps->regs[0],
497 (32 * sizeof(unsigned int))) ||
498 __get_user(fsr, (&fps->fsr))) {
499 pt_error_return(regs, EFAULT);
500 goto out_tsk;
501 }
502 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
503 task_thread_info(child)->xfsr[0] |= fsr;
504 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
505 task_thread_info(child)->gsr[0] = 0;
506 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
507 pt_succ_return(regs, 0);
508 goto out_tsk;
509 }
510
511 case PTRACE_SETFPREGS64: {
512 struct fps {
513 unsigned int regs[64];
514 unsigned long fsr;
515 };
516 struct fps __user *fps = (struct fps __user *) addr;
517 unsigned long *fpregs = task_thread_info(child)->fpregs;
518
519 if (copy_from_user(fpregs, &fps->regs[0],
520 (64 * sizeof(unsigned int))) ||
521 __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
522 pt_error_return(regs, EFAULT);
523 goto out_tsk;
524 }
525 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
526 task_thread_info(child)->gsr[0] = 0;
527 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
528 pt_succ_return(regs, 0);
529 goto out_tsk;
530 }
531
532 case PTRACE_READTEXT:
533 case PTRACE_READDATA: {
534 int res = ptrace_readdata(child, addr,
535 (char __user *)addr2, data);
536 if (res == data) {
537 pt_succ_return(regs, 0);
538 goto out_tsk;
539 }
540 if (res >= 0)
541 res = -EIO;
542 pt_error_return(regs, -res);
543 goto out_tsk;
544 }
545
546 case PTRACE_WRITETEXT:
547 case PTRACE_WRITEDATA: {
548 int res = ptrace_writedata(child, (char __user *) addr2,
549 addr, data);
550 if (res == data) {
551 pt_succ_return(regs, 0);
552 goto out_tsk;
553 }
554 if (res >= 0)
555 res = -EIO;
556 pt_error_return(regs, -res);
557 goto out_tsk;
558 }
559 case PTRACE_SYSCALL:
560 addr = 1;
561
562 case PTRACE_CONT: {
563 if (!valid_signal(data)) {
564 pt_error_return(regs, EIO);
565 goto out_tsk;
566 }
567
568 if (request == PTRACE_SYSCALL) {
569 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
570 } else {
571 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
572 }
573
574 child->exit_code = data;
575#ifdef DEBUG_PTRACE
576 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
577 child->pid, child->exit_code,
578 task_pt_regs(child)->tpc,
579 task_pt_regs(child)->tnpc);
580
581#endif
582 wake_up_process(child);
583 pt_succ_return(regs, 0);
584 goto out_tsk;
585 }
586
587
588
589
590
591
592 case PTRACE_KILL: {
593 if (child->exit_state == EXIT_ZOMBIE) {
594 pt_succ_return(regs, 0);
595 goto out_tsk;
596 }
597 child->exit_code = SIGKILL;
598 wake_up_process(child);
599 pt_succ_return(regs, 0);
600 goto out_tsk;
601 }
602
603 case PTRACE_SUNDETACH: {
604 int error = ptrace_detach(child, data);
605 if (error) {
606 pt_error_return(regs, EIO);
607 goto out_tsk;
608 }
609 pt_succ_return(regs, 0);
610 goto out_tsk;
611 }
612
613
614
615 case PTRACE_GETEVENTMSG: {
616 int err;
617
618 if (test_thread_flag(TIF_32BIT))
619 err = put_user(child->ptrace_message,
620 (unsigned int __user *) data);
621 else
622 err = put_user(child->ptrace_message,
623 (unsigned long __user *) data);
624 if (err)
625 pt_error_return(regs, -err);
626 else
627 pt_succ_return(regs, 0);
628 break;
629 }
630
631 default: {
632 int err = ptrace_request(child, request, addr, data);
633 if (err)
634 pt_error_return(regs, -err);
635 else
636 pt_succ_return(regs, 0);
637 goto out_tsk;
638 }
639 }
640out_tsk:
641 if (child)
642 put_task_struct(child);
643out:
644 unlock_kernel();
645}
646
647asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
648{
649
650 secure_computing(regs->u_regs[UREG_G1]);
651
652 if (unlikely(current->audit_context) && syscall_exit_p) {
653 unsigned long tstate = regs->tstate;
654 int result = AUDITSC_SUCCESS;
655
656 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
657 result = AUDITSC_FAILURE;
658
659 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
660 }
661
662 if (!(current->ptrace & PT_PTRACED))
663 goto out;
664
665 if (!test_thread_flag(TIF_SYSCALL_TRACE))
666 goto out;
667
668 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
669 ? 0x80 : 0));
670
671
672
673
674
675
676 if (current->exit_code) {
677 send_sig(current->exit_code, current, 1);
678 current->exit_code = 0;
679 }
680
681out:
682 if (unlikely(current->audit_context) && !syscall_exit_p)
683 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
684 AUDIT_ARCH_SPARC :
685 AUDIT_ARCH_SPARC64),
686 regs->u_regs[UREG_G1],
687 regs->u_regs[UREG_I0],
688 regs->u_regs[UREG_I1],
689 regs->u_regs[UREG_I2],
690 regs->u_regs[UREG_I3]);
691}
692
