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Linux/arch/x86/kernel/ptrace.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* By Ross Biro 1/23/92 */
  3 /*
  4  * Pentium III FXSR, SSE support
  5  *      Gareth Hughes <gareth@valinux.com>, May 2000
  6  */
  7 
  8 #include <linux/kernel.h>
  9 #include <linux/sched.h>
 10 #include <linux/sched/task_stack.h>
 11 #include <linux/mm.h>
 12 #include <linux/smp.h>
 13 #include <linux/errno.h>
 14 #include <linux/slab.h>
 15 #include <linux/ptrace.h>
 16 #include <linux/tracehook.h>
 17 #include <linux/user.h>
 18 #include <linux/elf.h>
 19 #include <linux/security.h>
 20 #include <linux/audit.h>
 21 #include <linux/seccomp.h>
 22 #include <linux/signal.h>
 23 #include <linux/perf_event.h>
 24 #include <linux/hw_breakpoint.h>
 25 #include <linux/rcupdate.h>
 26 #include <linux/export.h>
 27 #include <linux/context_tracking.h>
 28 #include <linux/nospec.h>
 29 
 30 #include <linux/uaccess.h>
 31 #include <asm/pgtable.h>
 32 #include <asm/processor.h>
 33 #include <asm/fpu/internal.h>
 34 #include <asm/fpu/signal.h>
 35 #include <asm/fpu/regset.h>
 36 #include <asm/debugreg.h>
 37 #include <asm/ldt.h>
 38 #include <asm/desc.h>
 39 #include <asm/prctl.h>
 40 #include <asm/proto.h>
 41 #include <asm/hw_breakpoint.h>
 42 #include <asm/traps.h>
 43 #include <asm/syscall.h>
 44 #include <asm/fsgsbase.h>
 45 #include <asm/io_bitmap.h>
 46 
 47 #include "tls.h"
 48 
 49 enum x86_regset {
 50         REGSET_GENERAL,
 51         REGSET_FP,
 52         REGSET_XFP,
 53         REGSET_IOPERM64 = REGSET_XFP,
 54         REGSET_XSTATE,
 55         REGSET_TLS,
 56         REGSET_IOPERM32,
 57 };
 58 
 59 struct pt_regs_offset {
 60         const char *name;
 61         int offset;
 62 };
 63 
 64 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
 65 #define REG_OFFSET_END {.name = NULL, .offset = 0}
 66 
 67 static const struct pt_regs_offset regoffset_table[] = {
 68 #ifdef CONFIG_X86_64
 69         REG_OFFSET_NAME(r15),
 70         REG_OFFSET_NAME(r14),
 71         REG_OFFSET_NAME(r13),
 72         REG_OFFSET_NAME(r12),
 73         REG_OFFSET_NAME(r11),
 74         REG_OFFSET_NAME(r10),
 75         REG_OFFSET_NAME(r9),
 76         REG_OFFSET_NAME(r8),
 77 #endif
 78         REG_OFFSET_NAME(bx),
 79         REG_OFFSET_NAME(cx),
 80         REG_OFFSET_NAME(dx),
 81         REG_OFFSET_NAME(si),
 82         REG_OFFSET_NAME(di),
 83         REG_OFFSET_NAME(bp),
 84         REG_OFFSET_NAME(ax),
 85 #ifdef CONFIG_X86_32
 86         REG_OFFSET_NAME(ds),
 87         REG_OFFSET_NAME(es),
 88         REG_OFFSET_NAME(fs),
 89         REG_OFFSET_NAME(gs),
 90 #endif
 91         REG_OFFSET_NAME(orig_ax),
 92         REG_OFFSET_NAME(ip),
 93         REG_OFFSET_NAME(cs),
 94         REG_OFFSET_NAME(flags),
 95         REG_OFFSET_NAME(sp),
 96         REG_OFFSET_NAME(ss),
 97         REG_OFFSET_END,
 98 };
 99 
100 /**
101  * regs_query_register_offset() - query register offset from its name
102  * @name:       the name of a register
103  *
104  * regs_query_register_offset() returns the offset of a register in struct
105  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
106  */
107 int regs_query_register_offset(const char *name)
108 {
109         const struct pt_regs_offset *roff;
110         for (roff = regoffset_table; roff->name != NULL; roff++)
111                 if (!strcmp(roff->name, name))
112                         return roff->offset;
113         return -EINVAL;
114 }
115 
116 /**
117  * regs_query_register_name() - query register name from its offset
118  * @offset:     the offset of a register in struct pt_regs.
119  *
120  * regs_query_register_name() returns the name of a register from its
121  * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
122  */
123 const char *regs_query_register_name(unsigned int offset)
124 {
125         const struct pt_regs_offset *roff;
126         for (roff = regoffset_table; roff->name != NULL; roff++)
127                 if (roff->offset == offset)
128                         return roff->name;
129         return NULL;
130 }
131 
132 /*
133  * does not yet catch signals sent when the child dies.
134  * in exit.c or in signal.c.
135  */
136 
137 /*
138  * Determines which flags the user has access to [1 = access, 0 = no access].
139  */
140 #define FLAG_MASK_32            ((unsigned long)                        \
141                                  (X86_EFLAGS_CF | X86_EFLAGS_PF |       \
142                                   X86_EFLAGS_AF | X86_EFLAGS_ZF |       \
143                                   X86_EFLAGS_SF | X86_EFLAGS_TF |       \
144                                   X86_EFLAGS_DF | X86_EFLAGS_OF |       \
145                                   X86_EFLAGS_RF | X86_EFLAGS_AC))
146 
147 /*
148  * Determines whether a value may be installed in a segment register.
149  */
150 static inline bool invalid_selector(u16 value)
151 {
152         return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
153 }
154 
155 #ifdef CONFIG_X86_32
156 
157 #define FLAG_MASK               FLAG_MASK_32
158 
159 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
160 {
161         BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
162         return &regs->bx + (regno >> 2);
163 }
164 
165 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
166 {
167         /*
168          * Returning the value truncates it to 16 bits.
169          */
170         unsigned int retval;
171         if (offset != offsetof(struct user_regs_struct, gs))
172                 retval = *pt_regs_access(task_pt_regs(task), offset);
173         else {
174                 if (task == current)
175                         retval = get_user_gs(task_pt_regs(task));
176                 else
177                         retval = task_user_gs(task);
178         }
179         return retval;
180 }
181 
182 static int set_segment_reg(struct task_struct *task,
183                            unsigned long offset, u16 value)
184 {
185         if (WARN_ON_ONCE(task == current))
186                 return -EIO;
187 
188         /*
189          * The value argument was already truncated to 16 bits.
190          */
191         if (invalid_selector(value))
192                 return -EIO;
193 
194         /*
195          * For %cs and %ss we cannot permit a null selector.
196          * We can permit a bogus selector as long as it has USER_RPL.
197          * Null selectors are fine for other segment registers, but
198          * we will never get back to user mode with invalid %cs or %ss
199          * and will take the trap in iret instead.  Much code relies
200          * on user_mode() to distinguish a user trap frame (which can
201          * safely use invalid selectors) from a kernel trap frame.
202          */
203         switch (offset) {
204         case offsetof(struct user_regs_struct, cs):
205         case offsetof(struct user_regs_struct, ss):
206                 if (unlikely(value == 0))
207                         return -EIO;
208                 /* Else, fall through */
209 
210         default:
211                 *pt_regs_access(task_pt_regs(task), offset) = value;
212                 break;
213 
214         case offsetof(struct user_regs_struct, gs):
215                 task_user_gs(task) = value;
216         }
217 
218         return 0;
219 }
220 
221 #else  /* CONFIG_X86_64 */
222 
223 #define FLAG_MASK               (FLAG_MASK_32 | X86_EFLAGS_NT)
224 
225 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
226 {
227         BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
228         return &regs->r15 + (offset / sizeof(regs->r15));
229 }
230 
231 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
232 {
233         /*
234          * Returning the value truncates it to 16 bits.
235          */
236         unsigned int seg;
237 
238         switch (offset) {
239         case offsetof(struct user_regs_struct, fs):
240                 if (task == current) {
241                         /* Older gas can't assemble movq %?s,%r?? */
242                         asm("movl %%fs,%0" : "=r" (seg));
243                         return seg;
244                 }
245                 return task->thread.fsindex;
246         case offsetof(struct user_regs_struct, gs):
247                 if (task == current) {
248                         asm("movl %%gs,%0" : "=r" (seg));
249                         return seg;
250                 }
251                 return task->thread.gsindex;
252         case offsetof(struct user_regs_struct, ds):
253                 if (task == current) {
254                         asm("movl %%ds,%0" : "=r" (seg));
255                         return seg;
256                 }
257                 return task->thread.ds;
258         case offsetof(struct user_regs_struct, es):
259                 if (task == current) {
260                         asm("movl %%es,%0" : "=r" (seg));
261                         return seg;
262                 }
263                 return task->thread.es;
264 
265         case offsetof(struct user_regs_struct, cs):
266         case offsetof(struct user_regs_struct, ss):
267                 break;
268         }
269         return *pt_regs_access(task_pt_regs(task), offset);
270 }
271 
272 static int set_segment_reg(struct task_struct *task,
273                            unsigned long offset, u16 value)
274 {
275         if (WARN_ON_ONCE(task == current))
276                 return -EIO;
277 
278         /*
279          * The value argument was already truncated to 16 bits.
280          */
281         if (invalid_selector(value))
282                 return -EIO;
283 
284         /*
285          * This function has some ABI oddities.
286          *
287          * A 32-bit ptracer probably expects that writing FS or GS will change
288          * FSBASE or GSBASE respectively.  In the absence of FSGSBASE support,
289          * this code indeed has that effect.  When FSGSBASE is added, this
290          * will require a special case.
291          *
292          * For existing 64-bit ptracers, writing FS or GS *also* currently
293          * changes the base if the selector is nonzero the next time the task
294          * is run.  This behavior may not be needed, and trying to preserve it
295          * when FSGSBASE is added would be complicated at best.
296          */
297 
298         switch (offset) {
299         case offsetof(struct user_regs_struct,fs):
300                 task->thread.fsindex = value;
301                 break;
302         case offsetof(struct user_regs_struct,gs):
303                 task->thread.gsindex = value;
304                 break;
305         case offsetof(struct user_regs_struct,ds):
306                 task->thread.ds = value;
307                 break;
308         case offsetof(struct user_regs_struct,es):
309                 task->thread.es = value;
310                 break;
311 
312                 /*
313                  * Can't actually change these in 64-bit mode.
314                  */
315         case offsetof(struct user_regs_struct,cs):
316                 if (unlikely(value == 0))
317                         return -EIO;
318                 task_pt_regs(task)->cs = value;
319                 break;
320         case offsetof(struct user_regs_struct,ss):
321                 if (unlikely(value == 0))
322                         return -EIO;
323                 task_pt_regs(task)->ss = value;
324                 break;
325         }
326 
327         return 0;
328 }
329 
330 #endif  /* CONFIG_X86_32 */
331 
332 static unsigned long get_flags(struct task_struct *task)
333 {
334         unsigned long retval = task_pt_regs(task)->flags;
335 
336         /*
337          * If the debugger set TF, hide it from the readout.
338          */
339         if (test_tsk_thread_flag(task, TIF_FORCED_TF))
340                 retval &= ~X86_EFLAGS_TF;
341 
342         return retval;
343 }
344 
345 static int set_flags(struct task_struct *task, unsigned long value)
346 {
347         struct pt_regs *regs = task_pt_regs(task);
348 
349         /*
350          * If the user value contains TF, mark that
351          * it was not "us" (the debugger) that set it.
352          * If not, make sure it stays set if we had.
353          */
354         if (value & X86_EFLAGS_TF)
355                 clear_tsk_thread_flag(task, TIF_FORCED_TF);
356         else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
357                 value |= X86_EFLAGS_TF;
358 
359         regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
360 
361         return 0;
362 }
363 
364 static int putreg(struct task_struct *child,
365                   unsigned long offset, unsigned long value)
366 {
367         switch (offset) {
368         case offsetof(struct user_regs_struct, cs):
369         case offsetof(struct user_regs_struct, ds):
370         case offsetof(struct user_regs_struct, es):
371         case offsetof(struct user_regs_struct, fs):
372         case offsetof(struct user_regs_struct, gs):
373         case offsetof(struct user_regs_struct, ss):
374                 return set_segment_reg(child, offset, value);
375 
376         case offsetof(struct user_regs_struct, flags):
377                 return set_flags(child, value);
378 
379 #ifdef CONFIG_X86_64
380         case offsetof(struct user_regs_struct,fs_base):
381                 if (value >= TASK_SIZE_MAX)
382                         return -EIO;
383                 /*
384                  * When changing the FS base, use do_arch_prctl_64()
385                  * to set the index to zero and to set the base
386                  * as requested.
387                  *
388                  * NB: This behavior is nonsensical and likely needs to
389                  * change when FSGSBASE support is added.
390                  */
391                 if (child->thread.fsbase != value)
392                         return do_arch_prctl_64(child, ARCH_SET_FS, value);
393                 return 0;
394         case offsetof(struct user_regs_struct,gs_base):
395                 /*
396                  * Exactly the same here as the %fs handling above.
397                  */
398                 if (value >= TASK_SIZE_MAX)
399                         return -EIO;
400                 if (child->thread.gsbase != value)
401                         return do_arch_prctl_64(child, ARCH_SET_GS, value);
402                 return 0;
403 #endif
404         }
405 
406         *pt_regs_access(task_pt_regs(child), offset) = value;
407         return 0;
408 }
409 
410 static unsigned long getreg(struct task_struct *task, unsigned long offset)
411 {
412         switch (offset) {
413         case offsetof(struct user_regs_struct, cs):
414         case offsetof(struct user_regs_struct, ds):
415         case offsetof(struct user_regs_struct, es):
416         case offsetof(struct user_regs_struct, fs):
417         case offsetof(struct user_regs_struct, gs):
418         case offsetof(struct user_regs_struct, ss):
419                 return get_segment_reg(task, offset);
420 
421         case offsetof(struct user_regs_struct, flags):
422                 return get_flags(task);
423 
424 #ifdef CONFIG_X86_64
425         case offsetof(struct user_regs_struct, fs_base):
426                 return x86_fsbase_read_task(task);
427         case offsetof(struct user_regs_struct, gs_base):
428                 return x86_gsbase_read_task(task);
429 #endif
430         }
431 
432         return *pt_regs_access(task_pt_regs(task), offset);
433 }
434 
435 static int genregs_get(struct task_struct *target,
436                        const struct user_regset *regset,
437                        unsigned int pos, unsigned int count,
438                        void *kbuf, void __user *ubuf)
439 {
440         if (kbuf) {
441                 unsigned long *k = kbuf;
442                 while (count >= sizeof(*k)) {
443                         *k++ = getreg(target, pos);
444                         count -= sizeof(*k);
445                         pos += sizeof(*k);
446                 }
447         } else {
448                 unsigned long __user *u = ubuf;
449                 while (count >= sizeof(*u)) {
450                         if (__put_user(getreg(target, pos), u++))
451                                 return -EFAULT;
452                         count -= sizeof(*u);
453                         pos += sizeof(*u);
454                 }
455         }
456 
457         return 0;
458 }
459 
460 static int genregs_set(struct task_struct *target,
461                        const struct user_regset *regset,
462                        unsigned int pos, unsigned int count,
463                        const void *kbuf, const void __user *ubuf)
464 {
465         int ret = 0;
466         if (kbuf) {
467                 const unsigned long *k = kbuf;
468                 while (count >= sizeof(*k) && !ret) {
469                         ret = putreg(target, pos, *k++);
470                         count -= sizeof(*k);
471                         pos += sizeof(*k);
472                 }
473         } else {
474                 const unsigned long  __user *u = ubuf;
475                 while (count >= sizeof(*u) && !ret) {
476                         unsigned long word;
477                         ret = __get_user(word, u++);
478                         if (ret)
479                                 break;
480                         ret = putreg(target, pos, word);
481                         count -= sizeof(*u);
482                         pos += sizeof(*u);
483                 }
484         }
485         return ret;
486 }
487 
488 static void ptrace_triggered(struct perf_event *bp,
489                              struct perf_sample_data *data,
490                              struct pt_regs *regs)
491 {
492         int i;
493         struct thread_struct *thread = &(current->thread);
494 
495         /*
496          * Store in the virtual DR6 register the fact that the breakpoint
497          * was hit so the thread's debugger will see it.
498          */
499         for (i = 0; i < HBP_NUM; i++) {
500                 if (thread->ptrace_bps[i] == bp)
501                         break;
502         }
503 
504         thread->debugreg6 |= (DR_TRAP0 << i);
505 }
506 
507 /*
508  * Walk through every ptrace breakpoints for this thread and
509  * build the dr7 value on top of their attributes.
510  *
511  */
512 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
513 {
514         int i;
515         int dr7 = 0;
516         struct arch_hw_breakpoint *info;
517 
518         for (i = 0; i < HBP_NUM; i++) {
519                 if (bp[i] && !bp[i]->attr.disabled) {
520                         info = counter_arch_bp(bp[i]);
521                         dr7 |= encode_dr7(i, info->len, info->type);
522                 }
523         }
524 
525         return dr7;
526 }
527 
528 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
529                                         int len, int type, bool disabled)
530 {
531         int err, bp_len, bp_type;
532 
533         err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
534         if (!err) {
535                 attr->bp_len = bp_len;
536                 attr->bp_type = bp_type;
537                 attr->disabled = disabled;
538         }
539 
540         return err;
541 }
542 
543 static struct perf_event *
544 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
545                                 unsigned long addr, bool disabled)
546 {
547         struct perf_event_attr attr;
548         int err;
549 
550         ptrace_breakpoint_init(&attr);
551         attr.bp_addr = addr;
552 
553         err = ptrace_fill_bp_fields(&attr, len, type, disabled);
554         if (err)
555                 return ERR_PTR(err);
556 
557         return register_user_hw_breakpoint(&attr, ptrace_triggered,
558                                                  NULL, tsk);
559 }
560 
561 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
562                                         int disabled)
563 {
564         struct perf_event_attr attr = bp->attr;
565         int err;
566 
567         err = ptrace_fill_bp_fields(&attr, len, type, disabled);
568         if (err)
569                 return err;
570 
571         return modify_user_hw_breakpoint(bp, &attr);
572 }
573 
574 /*
575  * Handle ptrace writes to debug register 7.
576  */
577 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
578 {
579         struct thread_struct *thread = &tsk->thread;
580         unsigned long old_dr7;
581         bool second_pass = false;
582         int i, rc, ret = 0;
583 
584         data &= ~DR_CONTROL_RESERVED;
585         old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
586 
587 restore:
588         rc = 0;
589         for (i = 0; i < HBP_NUM; i++) {
590                 unsigned len, type;
591                 bool disabled = !decode_dr7(data, i, &len, &type);
592                 struct perf_event *bp = thread->ptrace_bps[i];
593 
594                 if (!bp) {
595                         if (disabled)
596                                 continue;
597 
598                         bp = ptrace_register_breakpoint(tsk,
599                                         len, type, 0, disabled);
600                         if (IS_ERR(bp)) {
601                                 rc = PTR_ERR(bp);
602                                 break;
603                         }
604 
605                         thread->ptrace_bps[i] = bp;
606                         continue;
607                 }
608 
609                 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
610                 if (rc)
611                         break;
612         }
613 
614         /* Restore if the first pass failed, second_pass shouldn't fail. */
615         if (rc && !WARN_ON(second_pass)) {
616                 ret = rc;
617                 data = old_dr7;
618                 second_pass = true;
619                 goto restore;
620         }
621 
622         return ret;
623 }
624 
625 /*
626  * Handle PTRACE_PEEKUSR calls for the debug register area.
627  */
628 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
629 {
630         struct thread_struct *thread = &tsk->thread;
631         unsigned long val = 0;
632 
633         if (n < HBP_NUM) {
634                 int index = array_index_nospec(n, HBP_NUM);
635                 struct perf_event *bp = thread->ptrace_bps[index];
636 
637                 if (bp)
638                         val = bp->hw.info.address;
639         } else if (n == 6) {
640                 val = thread->debugreg6;
641         } else if (n == 7) {
642                 val = thread->ptrace_dr7;
643         }
644         return val;
645 }
646 
647 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
648                                       unsigned long addr)
649 {
650         struct thread_struct *t = &tsk->thread;
651         struct perf_event *bp = t->ptrace_bps[nr];
652         int err = 0;
653 
654         if (!bp) {
655                 /*
656                  * Put stub len and type to create an inactive but correct bp.
657                  *
658                  * CHECKME: the previous code returned -EIO if the addr wasn't
659                  * a valid task virtual addr. The new one will return -EINVAL in
660                  *  this case.
661                  * -EINVAL may be what we want for in-kernel breakpoints users,
662                  * but -EIO looks better for ptrace, since we refuse a register
663                  * writing for the user. And anyway this is the previous
664                  * behaviour.
665                  */
666                 bp = ptrace_register_breakpoint(tsk,
667                                 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
668                                 addr, true);
669                 if (IS_ERR(bp))
670                         err = PTR_ERR(bp);
671                 else
672                         t->ptrace_bps[nr] = bp;
673         } else {
674                 struct perf_event_attr attr = bp->attr;
675 
676                 attr.bp_addr = addr;
677                 err = modify_user_hw_breakpoint(bp, &attr);
678         }
679 
680         return err;
681 }
682 
683 /*
684  * Handle PTRACE_POKEUSR calls for the debug register area.
685  */
686 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
687                                unsigned long val)
688 {
689         struct thread_struct *thread = &tsk->thread;
690         /* There are no DR4 or DR5 registers */
691         int rc = -EIO;
692 
693         if (n < HBP_NUM) {
694                 rc = ptrace_set_breakpoint_addr(tsk, n, val);
695         } else if (n == 6) {
696                 thread->debugreg6 = val;
697                 rc = 0;
698         } else if (n == 7) {
699                 rc = ptrace_write_dr7(tsk, val);
700                 if (!rc)
701                         thread->ptrace_dr7 = val;
702         }
703         return rc;
704 }
705 
706 /*
707  * These access the current or another (stopped) task's io permission
708  * bitmap for debugging or core dump.
709  */
710 static int ioperm_active(struct task_struct *target,
711                          const struct user_regset *regset)
712 {
713         struct io_bitmap *iobm = target->thread.io_bitmap;
714 
715         return iobm ? DIV_ROUND_UP(iobm->max, regset->size) : 0;
716 }
717 
718 static int ioperm_get(struct task_struct *target,
719                       const struct user_regset *regset,
720                       unsigned int pos, unsigned int count,
721                       void *kbuf, void __user *ubuf)
722 {
723         struct io_bitmap *iobm = target->thread.io_bitmap;
724 
725         if (!iobm)
726                 return -ENXIO;
727 
728         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
729                                    iobm->bitmap, 0, IO_BITMAP_BYTES);
730 }
731 
732 /*
733  * Called by kernel/ptrace.c when detaching..
734  *
735  * Make sure the single step bit is not set.
736  */
737 void ptrace_disable(struct task_struct *child)
738 {
739         user_disable_single_step(child);
740 }
741 
742 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
743 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
744 #endif
745 
746 long arch_ptrace(struct task_struct *child, long request,
747                  unsigned long addr, unsigned long data)
748 {
749         int ret;
750         unsigned long __user *datap = (unsigned long __user *)data;
751 
752         switch (request) {
753         /* read the word at location addr in the USER area. */
754         case PTRACE_PEEKUSR: {
755                 unsigned long tmp;
756 
757                 ret = -EIO;
758                 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
759                         break;
760 
761                 tmp = 0;  /* Default return condition */
762                 if (addr < sizeof(struct user_regs_struct))
763                         tmp = getreg(child, addr);
764                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
765                          addr <= offsetof(struct user, u_debugreg[7])) {
766                         addr -= offsetof(struct user, u_debugreg[0]);
767                         tmp = ptrace_get_debugreg(child, addr / sizeof(data));
768                 }
769                 ret = put_user(tmp, datap);
770                 break;
771         }
772 
773         case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
774                 ret = -EIO;
775                 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
776                         break;
777 
778                 if (addr < sizeof(struct user_regs_struct))
779                         ret = putreg(child, addr, data);
780                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
781                          addr <= offsetof(struct user, u_debugreg[7])) {
782                         addr -= offsetof(struct user, u_debugreg[0]);
783                         ret = ptrace_set_debugreg(child,
784                                                   addr / sizeof(data), data);
785                 }
786                 break;
787 
788         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
789                 return copy_regset_to_user(child,
790                                            task_user_regset_view(current),
791                                            REGSET_GENERAL,
792                                            0, sizeof(struct user_regs_struct),
793                                            datap);
794 
795         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
796                 return copy_regset_from_user(child,
797                                              task_user_regset_view(current),
798                                              REGSET_GENERAL,
799                                              0, sizeof(struct user_regs_struct),
800                                              datap);
801 
802         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
803                 return copy_regset_to_user(child,
804                                            task_user_regset_view(current),
805                                            REGSET_FP,
806                                            0, sizeof(struct user_i387_struct),
807                                            datap);
808 
809         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
810                 return copy_regset_from_user(child,
811                                              task_user_regset_view(current),
812                                              REGSET_FP,
813                                              0, sizeof(struct user_i387_struct),
814                                              datap);
815 
816 #ifdef CONFIG_X86_32
817         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
818                 return copy_regset_to_user(child, &user_x86_32_view,
819                                            REGSET_XFP,
820                                            0, sizeof(struct user_fxsr_struct),
821                                            datap) ? -EIO : 0;
822 
823         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
824                 return copy_regset_from_user(child, &user_x86_32_view,
825                                              REGSET_XFP,
826                                              0, sizeof(struct user_fxsr_struct),
827                                              datap) ? -EIO : 0;
828 #endif
829 
830 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
831         case PTRACE_GET_THREAD_AREA:
832                 if ((int) addr < 0)
833                         return -EIO;
834                 ret = do_get_thread_area(child, addr,
835                                         (struct user_desc __user *)data);
836                 break;
837 
838         case PTRACE_SET_THREAD_AREA:
839                 if ((int) addr < 0)
840                         return -EIO;
841                 ret = do_set_thread_area(child, addr,
842                                         (struct user_desc __user *)data, 0);
843                 break;
844 #endif
845 
846 #ifdef CONFIG_X86_64
847                 /* normal 64bit interface to access TLS data.
848                    Works just like arch_prctl, except that the arguments
849                    are reversed. */
850         case PTRACE_ARCH_PRCTL:
851                 ret = do_arch_prctl_64(child, data, addr);
852                 break;
853 #endif
854 
855         default:
856                 ret = ptrace_request(child, request, addr, data);
857                 break;
858         }
859 
860         return ret;
861 }
862 
863 #ifdef CONFIG_IA32_EMULATION
864 
865 #include <linux/compat.h>
866 #include <linux/syscalls.h>
867 #include <asm/ia32.h>
868 #include <asm/user32.h>
869 
870 #define R32(l,q)                                                        \
871         case offsetof(struct user32, regs.l):                           \
872                 regs->q = value; break
873 
874 #define SEG32(rs)                                                       \
875         case offsetof(struct user32, regs.rs):                          \
876                 return set_segment_reg(child,                           \
877                                        offsetof(struct user_regs_struct, rs), \
878                                        value);                          \
879                 break
880 
881 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
882 {
883         struct pt_regs *regs = task_pt_regs(child);
884 
885         switch (regno) {
886 
887         SEG32(cs);
888         SEG32(ds);
889         SEG32(es);
890         SEG32(fs);
891         SEG32(gs);
892         SEG32(ss);
893 
894         R32(ebx, bx);
895         R32(ecx, cx);
896         R32(edx, dx);
897         R32(edi, di);
898         R32(esi, si);
899         R32(ebp, bp);
900         R32(eax, ax);
901         R32(eip, ip);
902         R32(esp, sp);
903 
904         case offsetof(struct user32, regs.orig_eax):
905                 /*
906                  * Warning: bizarre corner case fixup here.  A 32-bit
907                  * debugger setting orig_eax to -1 wants to disable
908                  * syscall restart.  Make sure that the syscall
909                  * restart code sign-extends orig_ax.  Also make sure
910                  * we interpret the -ERESTART* codes correctly if
911                  * loaded into regs->ax in case the task is not
912                  * actually still sitting at the exit from a 32-bit
913                  * syscall with TS_COMPAT still set.
914                  */
915                 regs->orig_ax = value;
916                 if (syscall_get_nr(child, regs) >= 0)
917                         child->thread_info.status |= TS_I386_REGS_POKED;
918                 break;
919 
920         case offsetof(struct user32, regs.eflags):
921                 return set_flags(child, value);
922 
923         case offsetof(struct user32, u_debugreg[0]) ...
924                 offsetof(struct user32, u_debugreg[7]):
925                 regno -= offsetof(struct user32, u_debugreg[0]);
926                 return ptrace_set_debugreg(child, regno / 4, value);
927 
928         default:
929                 if (regno > sizeof(struct user32) || (regno & 3))
930                         return -EIO;
931 
932                 /*
933                  * Other dummy fields in the virtual user structure
934                  * are ignored
935                  */
936                 break;
937         }
938         return 0;
939 }
940 
941 #undef R32
942 #undef SEG32
943 
944 #define R32(l,q)                                                        \
945         case offsetof(struct user32, regs.l):                           \
946                 *val = regs->q; break
947 
948 #define SEG32(rs)                                                       \
949         case offsetof(struct user32, regs.rs):                          \
950                 *val = get_segment_reg(child,                           \
951                                        offsetof(struct user_regs_struct, rs)); \
952                 break
953 
954 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
955 {
956         struct pt_regs *regs = task_pt_regs(child);
957 
958         switch (regno) {
959 
960         SEG32(ds);
961         SEG32(es);
962         SEG32(fs);
963         SEG32(gs);
964 
965         R32(cs, cs);
966         R32(ss, ss);
967         R32(ebx, bx);
968         R32(ecx, cx);
969         R32(edx, dx);
970         R32(edi, di);
971         R32(esi, si);
972         R32(ebp, bp);
973         R32(eax, ax);
974         R32(orig_eax, orig_ax);
975         R32(eip, ip);
976         R32(esp, sp);
977 
978         case offsetof(struct user32, regs.eflags):
979                 *val = get_flags(child);
980                 break;
981 
982         case offsetof(struct user32, u_debugreg[0]) ...
983                 offsetof(struct user32, u_debugreg[7]):
984                 regno -= offsetof(struct user32, u_debugreg[0]);
985                 *val = ptrace_get_debugreg(child, regno / 4);
986                 break;
987 
988         default:
989                 if (regno > sizeof(struct user32) || (regno & 3))
990                         return -EIO;
991 
992                 /*
993                  * Other dummy fields in the virtual user structure
994                  * are ignored
995                  */
996                 *val = 0;
997                 break;
998         }
999         return 0;
1000 }
1001 
1002 #undef R32
1003 #undef SEG32
1004 
1005 static int genregs32_get(struct task_struct *target,
1006                          const struct user_regset *regset,
1007                          unsigned int pos, unsigned int count,
1008                          void *kbuf, void __user *ubuf)
1009 {
1010         if (kbuf) {
1011                 compat_ulong_t *k = kbuf;
1012                 while (count >= sizeof(*k)) {
1013                         getreg32(target, pos, k++);
1014                         count -= sizeof(*k);
1015                         pos += sizeof(*k);
1016                 }
1017         } else {
1018                 compat_ulong_t __user *u = ubuf;
1019                 while (count >= sizeof(*u)) {
1020                         compat_ulong_t word;
1021                         getreg32(target, pos, &word);
1022                         if (__put_user(word, u++))
1023                                 return -EFAULT;
1024                         count -= sizeof(*u);
1025                         pos += sizeof(*u);
1026                 }
1027         }
1028 
1029         return 0;
1030 }
1031 
1032 static int genregs32_set(struct task_struct *target,
1033                          const struct user_regset *regset,
1034                          unsigned int pos, unsigned int count,
1035                          const void *kbuf, const void __user *ubuf)
1036 {
1037         int ret = 0;
1038         if (kbuf) {
1039                 const compat_ulong_t *k = kbuf;
1040                 while (count >= sizeof(*k) && !ret) {
1041                         ret = putreg32(target, pos, *k++);
1042                         count -= sizeof(*k);
1043                         pos += sizeof(*k);
1044                 }
1045         } else {
1046                 const compat_ulong_t __user *u = ubuf;
1047                 while (count >= sizeof(*u) && !ret) {
1048                         compat_ulong_t word;
1049                         ret = __get_user(word, u++);
1050                         if (ret)
1051                                 break;
1052                         ret = putreg32(target, pos, word);
1053                         count -= sizeof(*u);
1054                         pos += sizeof(*u);
1055                 }
1056         }
1057         return ret;
1058 }
1059 
1060 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1061                              compat_ulong_t caddr, compat_ulong_t cdata)
1062 {
1063         unsigned long addr = caddr;
1064         unsigned long data = cdata;
1065         void __user *datap = compat_ptr(data);
1066         int ret;
1067         __u32 val;
1068 
1069         switch (request) {
1070         case PTRACE_PEEKUSR:
1071                 ret = getreg32(child, addr, &val);
1072                 if (ret == 0)
1073                         ret = put_user(val, (__u32 __user *)datap);
1074                 break;
1075 
1076         case PTRACE_POKEUSR:
1077                 ret = putreg32(child, addr, data);
1078                 break;
1079 
1080         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1081                 return copy_regset_to_user(child, &user_x86_32_view,
1082                                            REGSET_GENERAL,
1083                                            0, sizeof(struct user_regs_struct32),
1084                                            datap);
1085 
1086         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1087                 return copy_regset_from_user(child, &user_x86_32_view,
1088                                              REGSET_GENERAL, 0,
1089                                              sizeof(struct user_regs_struct32),
1090                                              datap);
1091 
1092         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1093                 return copy_regset_to_user(child, &user_x86_32_view,
1094                                            REGSET_FP, 0,
1095                                            sizeof(struct user_i387_ia32_struct),
1096                                            datap);
1097 
1098         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1099                 return copy_regset_from_user(
1100                         child, &user_x86_32_view, REGSET_FP,
1101                         0, sizeof(struct user_i387_ia32_struct), datap);
1102 
1103         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1104                 return copy_regset_to_user(child, &user_x86_32_view,
1105                                            REGSET_XFP, 0,
1106                                            sizeof(struct user32_fxsr_struct),
1107                                            datap);
1108 
1109         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1110                 return copy_regset_from_user(child, &user_x86_32_view,
1111                                              REGSET_XFP, 0,
1112                                              sizeof(struct user32_fxsr_struct),
1113                                              datap);
1114 
1115         case PTRACE_GET_THREAD_AREA:
1116         case PTRACE_SET_THREAD_AREA:
1117                 return arch_ptrace(child, request, addr, data);
1118 
1119         default:
1120                 return compat_ptrace_request(child, request, addr, data);
1121         }
1122 
1123         return ret;
1124 }
1125 #endif /* CONFIG_IA32_EMULATION */
1126 
1127 #ifdef CONFIG_X86_X32_ABI
1128 static long x32_arch_ptrace(struct task_struct *child,
1129                             compat_long_t request, compat_ulong_t caddr,
1130                             compat_ulong_t cdata)
1131 {
1132         unsigned long addr = caddr;
1133         unsigned long data = cdata;
1134         void __user *datap = compat_ptr(data);
1135         int ret;
1136 
1137         switch (request) {
1138         /* Read 32bits at location addr in the USER area.  Only allow
1139            to return the lower 32bits of segment and debug registers.  */
1140         case PTRACE_PEEKUSR: {
1141                 u32 tmp;
1142 
1143                 ret = -EIO;
1144                 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1145                     addr < offsetof(struct user_regs_struct, cs))
1146                         break;
1147 
1148                 tmp = 0;  /* Default return condition */
1149                 if (addr < sizeof(struct user_regs_struct))
1150                         tmp = getreg(child, addr);
1151                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1152                          addr <= offsetof(struct user, u_debugreg[7])) {
1153                         addr -= offsetof(struct user, u_debugreg[0]);
1154                         tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1155                 }
1156                 ret = put_user(tmp, (__u32 __user *)datap);
1157                 break;
1158         }
1159 
1160         /* Write the word at location addr in the USER area.  Only allow
1161            to update segment and debug registers with the upper 32bits
1162            zero-extended. */
1163         case PTRACE_POKEUSR:
1164                 ret = -EIO;
1165                 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1166                     addr < offsetof(struct user_regs_struct, cs))
1167                         break;
1168 
1169                 if (addr < sizeof(struct user_regs_struct))
1170                         ret = putreg(child, addr, data);
1171                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1172                          addr <= offsetof(struct user, u_debugreg[7])) {
1173                         addr -= offsetof(struct user, u_debugreg[0]);
1174                         ret = ptrace_set_debugreg(child,
1175                                                   addr / sizeof(data), data);
1176                 }
1177                 break;
1178 
1179         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1180                 return copy_regset_to_user(child,
1181                                            task_user_regset_view(current),
1182                                            REGSET_GENERAL,
1183                                            0, sizeof(struct user_regs_struct),
1184                                            datap);
1185 
1186         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1187                 return copy_regset_from_user(child,
1188                                              task_user_regset_view(current),
1189                                              REGSET_GENERAL,
1190                                              0, sizeof(struct user_regs_struct),
1191                                              datap);
1192 
1193         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1194                 return copy_regset_to_user(child,
1195                                            task_user_regset_view(current),
1196                                            REGSET_FP,
1197                                            0, sizeof(struct user_i387_struct),
1198                                            datap);
1199 
1200         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1201                 return copy_regset_from_user(child,
1202                                              task_user_regset_view(current),
1203                                              REGSET_FP,
1204                                              0, sizeof(struct user_i387_struct),
1205                                              datap);
1206 
1207         default:
1208                 return compat_ptrace_request(child, request, addr, data);
1209         }
1210 
1211         return ret;
1212 }
1213 #endif
1214 
1215 #ifdef CONFIG_COMPAT
1216 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1217                         compat_ulong_t caddr, compat_ulong_t cdata)
1218 {
1219 #ifdef CONFIG_X86_X32_ABI
1220         if (!in_ia32_syscall())
1221                 return x32_arch_ptrace(child, request, caddr, cdata);
1222 #endif
1223 #ifdef CONFIG_IA32_EMULATION
1224         return ia32_arch_ptrace(child, request, caddr, cdata);
1225 #else
1226         return 0;
1227 #endif
1228 }
1229 #endif  /* CONFIG_COMPAT */
1230 
1231 #ifdef CONFIG_X86_64
1232 
1233 static struct user_regset x86_64_regsets[] __ro_after_init = {
1234         [REGSET_GENERAL] = {
1235                 .core_note_type = NT_PRSTATUS,
1236                 .n = sizeof(struct user_regs_struct) / sizeof(long),
1237                 .size = sizeof(long), .align = sizeof(long),
1238                 .get = genregs_get, .set = genregs_set
1239         },
1240         [REGSET_FP] = {
1241                 .core_note_type = NT_PRFPREG,
1242                 .n = sizeof(struct user_i387_struct) / sizeof(long),
1243                 .size = sizeof(long), .align = sizeof(long),
1244                 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1245         },
1246         [REGSET_XSTATE] = {
1247                 .core_note_type = NT_X86_XSTATE,
1248                 .size = sizeof(u64), .align = sizeof(u64),
1249                 .active = xstateregs_active, .get = xstateregs_get,
1250                 .set = xstateregs_set
1251         },
1252         [REGSET_IOPERM64] = {
1253                 .core_note_type = NT_386_IOPERM,
1254                 .n = IO_BITMAP_LONGS,
1255                 .size = sizeof(long), .align = sizeof(long),
1256                 .active = ioperm_active, .get = ioperm_get
1257         },
1258 };
1259 
1260 static const struct user_regset_view user_x86_64_view = {
1261         .name = "x86_64", .e_machine = EM_X86_64,
1262         .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1263 };
1264 
1265 #else  /* CONFIG_X86_32 */
1266 
1267 #define user_regs_struct32      user_regs_struct
1268 #define genregs32_get           genregs_get
1269 #define genregs32_set           genregs_set
1270 
1271 #endif  /* CONFIG_X86_64 */
1272 
1273 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1274 static struct user_regset x86_32_regsets[] __ro_after_init = {
1275         [REGSET_GENERAL] = {
1276                 .core_note_type = NT_PRSTATUS,
1277                 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1278                 .size = sizeof(u32), .align = sizeof(u32),
1279                 .get = genregs32_get, .set = genregs32_set
1280         },
1281         [REGSET_FP] = {
1282                 .core_note_type = NT_PRFPREG,
1283                 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1284                 .size = sizeof(u32), .align = sizeof(u32),
1285                 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1286         },
1287         [REGSET_XFP] = {
1288                 .core_note_type = NT_PRXFPREG,
1289                 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1290                 .size = sizeof(u32), .align = sizeof(u32),
1291                 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1292         },
1293         [REGSET_XSTATE] = {
1294                 .core_note_type = NT_X86_XSTATE,
1295                 .size = sizeof(u64), .align = sizeof(u64),
1296                 .active = xstateregs_active, .get = xstateregs_get,
1297                 .set = xstateregs_set
1298         },
1299         [REGSET_TLS] = {
1300                 .core_note_type = NT_386_TLS,
1301                 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1302                 .size = sizeof(struct user_desc),
1303                 .align = sizeof(struct user_desc),
1304                 .active = regset_tls_active,
1305                 .get = regset_tls_get, .set = regset_tls_set
1306         },
1307         [REGSET_IOPERM32] = {
1308                 .core_note_type = NT_386_IOPERM,
1309                 .n = IO_BITMAP_BYTES / sizeof(u32),
1310                 .size = sizeof(u32), .align = sizeof(u32),
1311                 .active = ioperm_active, .get = ioperm_get
1312         },
1313 };
1314 
1315 static const struct user_regset_view user_x86_32_view = {
1316         .name = "i386", .e_machine = EM_386,
1317         .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1318 };
1319 #endif
1320 
1321 /*
1322  * This represents bytes 464..511 in the memory layout exported through
1323  * the REGSET_XSTATE interface.
1324  */
1325 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1326 
1327 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1328 {
1329 #ifdef CONFIG_X86_64
1330         x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1331 #endif
1332 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1333         x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1334 #endif
1335         xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1336 }
1337 
1338 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1339 {
1340 #ifdef CONFIG_IA32_EMULATION
1341         if (!user_64bit_mode(task_pt_regs(task)))
1342 #endif
1343 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1344                 return &user_x86_32_view;
1345 #endif
1346 #ifdef CONFIG_X86_64
1347         return &user_x86_64_view;
1348 #endif
1349 }
1350 
1351 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1352 {
1353         struct task_struct *tsk = current;
1354 
1355         tsk->thread.trap_nr = X86_TRAP_DB;
1356         tsk->thread.error_code = error_code;
1357 
1358         /* Send us the fake SIGTRAP */
1359         force_sig_fault(SIGTRAP, si_code,
1360                         user_mode(regs) ? (void __user *)regs->ip : NULL);
1361 }
1362 
1363 void user_single_step_report(struct pt_regs *regs)
1364 {
1365         send_sigtrap(regs, 0, TRAP_BRKPT);
1366 }
1367 

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