Root/kernel/ptrace.c

1/*
2 * linux/kernel/ptrace.c
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 *
6 * Common interfaces for "ptrace()" which we do not want
7 * to continually duplicate across every architecture.
8 */
9
10#include <linux/capability.h>
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/errno.h>
14#include <linux/mm.h>
15#include <linux/highmem.h>
16#include <linux/pagemap.h>
17#include <linux/ptrace.h>
18#include <linux/security.h>
19#include <linux/signal.h>
20#include <linux/audit.h>
21#include <linux/pid_namespace.h>
22#include <linux/syscalls.h>
23#include <linux/uaccess.h>
24#include <linux/regset.h>
25
26
27/*
28 * ptrace a task: make the debugger its new parent and
29 * move it to the ptrace list.
30 *
31 * Must be called with the tasklist lock write-held.
32 */
33void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
34{
35    BUG_ON(!list_empty(&child->ptrace_entry));
36    list_add(&child->ptrace_entry, &new_parent->ptraced);
37    child->parent = new_parent;
38}
39
40/*
41 * Turn a tracing stop into a normal stop now, since with no tracer there
42 * would be no way to wake it up with SIGCONT or SIGKILL. If there was a
43 * signal sent that would resume the child, but didn't because it was in
44 * TASK_TRACED, resume it now.
45 * Requires that irqs be disabled.
46 */
47static void ptrace_untrace(struct task_struct *child)
48{
49    spin_lock(&child->sighand->siglock);
50    if (task_is_traced(child)) {
51        /*
52         * If the group stop is completed or in progress,
53         * this thread was already counted as stopped.
54         */
55        if (child->signal->flags & SIGNAL_STOP_STOPPED ||
56            child->signal->group_stop_count)
57            __set_task_state(child, TASK_STOPPED);
58        else
59            signal_wake_up(child, 1);
60    }
61    spin_unlock(&child->sighand->siglock);
62}
63
64/*
65 * unptrace a task: move it back to its original parent and
66 * remove it from the ptrace list.
67 *
68 * Must be called with the tasklist lock write-held.
69 */
70void __ptrace_unlink(struct task_struct *child)
71{
72    BUG_ON(!child->ptrace);
73
74    child->ptrace = 0;
75    child->parent = child->real_parent;
76    list_del_init(&child->ptrace_entry);
77
78    if (task_is_traced(child))
79        ptrace_untrace(child);
80}
81
82/*
83 * Check that we have indeed attached to the thing..
84 */
85int ptrace_check_attach(struct task_struct *child, int kill)
86{
87    int ret = -ESRCH;
88
89    /*
90     * We take the read lock around doing both checks to close a
91     * possible race where someone else was tracing our child and
92     * detached between these two checks. After this locked check,
93     * we are sure that this is our traced child and that can only
94     * be changed by us so it's not changing right after this.
95     */
96    read_lock(&tasklist_lock);
97    if ((child->ptrace & PT_PTRACED) && child->parent == current) {
98        ret = 0;
99        /*
100         * child->sighand can't be NULL, release_task()
101         * does ptrace_unlink() before __exit_signal().
102         */
103        spin_lock_irq(&child->sighand->siglock);
104        if (task_is_stopped(child))
105            child->state = TASK_TRACED;
106        else if (!task_is_traced(child) && !kill)
107            ret = -ESRCH;
108        spin_unlock_irq(&child->sighand->siglock);
109    }
110    read_unlock(&tasklist_lock);
111
112    if (!ret && !kill)
113        ret = wait_task_inactive(child, TASK_TRACED) ? 0 : -ESRCH;
114
115    /* All systems go.. */
116    return ret;
117}
118
119int __ptrace_may_access(struct task_struct *task, unsigned int mode)
120{
121    const struct cred *cred = current_cred(), *tcred;
122
123    /* May we inspect the given task?
124     * This check is used both for attaching with ptrace
125     * and for allowing access to sensitive information in /proc.
126     *
127     * ptrace_attach denies several cases that /proc allows
128     * because setting up the necessary parent/child relationship
129     * or halting the specified task is impossible.
130     */
131    int dumpable = 0;
132    /* Don't let security modules deny introspection */
133    if (task == current)
134        return 0;
135    rcu_read_lock();
136    tcred = __task_cred(task);
137    if ((cred->uid != tcred->euid ||
138         cred->uid != tcred->suid ||
139         cred->uid != tcred->uid ||
140         cred->gid != tcred->egid ||
141         cred->gid != tcred->sgid ||
142         cred->gid != tcred->gid) &&
143        !capable(CAP_SYS_PTRACE)) {
144        rcu_read_unlock();
145        return -EPERM;
146    }
147    rcu_read_unlock();
148    smp_rmb();
149    if (task->mm)
150        dumpable = get_dumpable(task->mm);
151    if (!dumpable && !capable(CAP_SYS_PTRACE))
152        return -EPERM;
153
154    return security_ptrace_access_check(task, mode);
155}
156
157bool ptrace_may_access(struct task_struct *task, unsigned int mode)
158{
159    int err;
160    task_lock(task);
161    err = __ptrace_may_access(task, mode);
162    task_unlock(task);
163    return !err;
164}
165
166static int ptrace_attach(struct task_struct *task)
167{
168    int retval;
169
170    audit_ptrace(task);
171
172    retval = -EPERM;
173    if (unlikely(task->flags & PF_KTHREAD))
174        goto out;
175    if (same_thread_group(task, current))
176        goto out;
177
178    /*
179     * Protect exec's credential calculations against our interference;
180     * interference; SUID, SGID and LSM creds get determined differently
181     * under ptrace.
182     */
183    retval = -ERESTARTNOINTR;
184    if (mutex_lock_interruptible(&task->signal->cred_guard_mutex))
185        goto out;
186
187    task_lock(task);
188    retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH);
189    task_unlock(task);
190    if (retval)
191        goto unlock_creds;
192
193    write_lock_irq(&tasklist_lock);
194    retval = -EPERM;
195    if (unlikely(task->exit_state))
196        goto unlock_tasklist;
197    if (task->ptrace)
198        goto unlock_tasklist;
199
200    task->ptrace = PT_PTRACED;
201    if (capable(CAP_SYS_PTRACE))
202        task->ptrace |= PT_PTRACE_CAP;
203
204    __ptrace_link(task, current);
205    send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
206
207    retval = 0;
208unlock_tasklist:
209    write_unlock_irq(&tasklist_lock);
210unlock_creds:
211    mutex_unlock(&task->signal->cred_guard_mutex);
212out:
213    return retval;
214}
215
216/**
217 * ptrace_traceme -- helper for PTRACE_TRACEME
218 *
219 * Performs checks and sets PT_PTRACED.
220 * Should be used by all ptrace implementations for PTRACE_TRACEME.
221 */
222static int ptrace_traceme(void)
223{
224    int ret = -EPERM;
225
226    write_lock_irq(&tasklist_lock);
227    /* Are we already being traced? */
228    if (!current->ptrace) {
229        ret = security_ptrace_traceme(current->parent);
230        /*
231         * Check PF_EXITING to ensure ->real_parent has not passed
232         * exit_ptrace(). Otherwise we don't report the error but
233         * pretend ->real_parent untraces us right after return.
234         */
235        if (!ret && !(current->real_parent->flags & PF_EXITING)) {
236            current->ptrace = PT_PTRACED;
237            __ptrace_link(current, current->real_parent);
238        }
239    }
240    write_unlock_irq(&tasklist_lock);
241
242    return ret;
243}
244
245/*
246 * Called with irqs disabled, returns true if childs should reap themselves.
247 */
248static int ignoring_children(struct sighand_struct *sigh)
249{
250    int ret;
251    spin_lock(&sigh->siglock);
252    ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
253          (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
254    spin_unlock(&sigh->siglock);
255    return ret;
256}
257
258/*
259 * Called with tasklist_lock held for writing.
260 * Unlink a traced task, and clean it up if it was a traced zombie.
261 * Return true if it needs to be reaped with release_task().
262 * (We can't call release_task() here because we already hold tasklist_lock.)
263 *
264 * If it's a zombie, our attachedness prevented normal parent notification
265 * or self-reaping. Do notification now if it would have happened earlier.
266 * If it should reap itself, return true.
267 *
268 * If it's our own child, there is no notification to do. But if our normal
269 * children self-reap, then this child was prevented by ptrace and we must
270 * reap it now, in that case we must also wake up sub-threads sleeping in
271 * do_wait().
272 */
273static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
274{
275    __ptrace_unlink(p);
276
277    if (p->exit_state == EXIT_ZOMBIE) {
278        if (!task_detached(p) && thread_group_empty(p)) {
279            if (!same_thread_group(p->real_parent, tracer))
280                do_notify_parent(p, p->exit_signal);
281            else if (ignoring_children(tracer->sighand)) {
282                __wake_up_parent(p, tracer);
283                p->exit_signal = -1;
284            }
285        }
286        if (task_detached(p)) {
287            /* Mark it as in the process of being reaped. */
288            p->exit_state = EXIT_DEAD;
289            return true;
290        }
291    }
292
293    return false;
294}
295
296static int ptrace_detach(struct task_struct *child, unsigned int data)
297{
298    bool dead = false;
299
300    if (!valid_signal(data))
301        return -EIO;
302
303    /* Architecture-specific hardware disable .. */
304    ptrace_disable(child);
305    clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
306
307    write_lock_irq(&tasklist_lock);
308    /*
309     * This child can be already killed. Make sure de_thread() or
310     * our sub-thread doing do_wait() didn't do release_task() yet.
311     */
312    if (child->ptrace) {
313        child->exit_code = data;
314        dead = __ptrace_detach(current, child);
315        if (!child->exit_state)
316            wake_up_state(child, TASK_TRACED | TASK_STOPPED);
317    }
318    write_unlock_irq(&tasklist_lock);
319
320    if (unlikely(dead))
321        release_task(child);
322
323    return 0;
324}
325
326/*
327 * Detach all tasks we were using ptrace on. Called with tasklist held
328 * for writing, and returns with it held too. But note it can release
329 * and reacquire the lock.
330 */
331void exit_ptrace(struct task_struct *tracer)
332    __releases(&tasklist_lock)
333    __acquires(&tasklist_lock)
334{
335    struct task_struct *p, *n;
336    LIST_HEAD(ptrace_dead);
337
338    if (likely(list_empty(&tracer->ptraced)))
339        return;
340
341    list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
342        if (__ptrace_detach(tracer, p))
343            list_add(&p->ptrace_entry, &ptrace_dead);
344    }
345
346    write_unlock_irq(&tasklist_lock);
347    BUG_ON(!list_empty(&tracer->ptraced));
348
349    list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
350        list_del_init(&p->ptrace_entry);
351        release_task(p);
352    }
353
354    write_lock_irq(&tasklist_lock);
355}
356
357int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
358{
359    int copied = 0;
360
361    while (len > 0) {
362        char buf[128];
363        int this_len, retval;
364
365        this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
366        retval = access_process_vm(tsk, src, buf, this_len, 0);
367        if (!retval) {
368            if (copied)
369                break;
370            return -EIO;
371        }
372        if (copy_to_user(dst, buf, retval))
373            return -EFAULT;
374        copied += retval;
375        src += retval;
376        dst += retval;
377        len -= retval;
378    }
379    return copied;
380}
381
382int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len)
383{
384    int copied = 0;
385
386    while (len > 0) {
387        char buf[128];
388        int this_len, retval;
389
390        this_len = (len > sizeof(buf)) ? sizeof(buf) : len;
391        if (copy_from_user(buf, src, this_len))
392            return -EFAULT;
393        retval = access_process_vm(tsk, dst, buf, this_len, 1);
394        if (!retval) {
395            if (copied)
396                break;
397            return -EIO;
398        }
399        copied += retval;
400        src += retval;
401        dst += retval;
402        len -= retval;
403    }
404    return copied;
405}
406
407static int ptrace_setoptions(struct task_struct *child, unsigned long data)
408{
409    child->ptrace &= ~PT_TRACE_MASK;
410
411    if (data & PTRACE_O_TRACESYSGOOD)
412        child->ptrace |= PT_TRACESYSGOOD;
413
414    if (data & PTRACE_O_TRACEFORK)
415        child->ptrace |= PT_TRACE_FORK;
416
417    if (data & PTRACE_O_TRACEVFORK)
418        child->ptrace |= PT_TRACE_VFORK;
419
420    if (data & PTRACE_O_TRACECLONE)
421        child->ptrace |= PT_TRACE_CLONE;
422
423    if (data & PTRACE_O_TRACEEXEC)
424        child->ptrace |= PT_TRACE_EXEC;
425
426    if (data & PTRACE_O_TRACEVFORKDONE)
427        child->ptrace |= PT_TRACE_VFORK_DONE;
428
429    if (data & PTRACE_O_TRACEEXIT)
430        child->ptrace |= PT_TRACE_EXIT;
431
432    return (data & ~PTRACE_O_MASK) ? -EINVAL : 0;
433}
434
435static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
436{
437    unsigned long flags;
438    int error = -ESRCH;
439
440    if (lock_task_sighand(child, &flags)) {
441        error = -EINVAL;
442        if (likely(child->last_siginfo != NULL)) {
443            *info = *child->last_siginfo;
444            error = 0;
445        }
446        unlock_task_sighand(child, &flags);
447    }
448    return error;
449}
450
451static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
452{
453    unsigned long flags;
454    int error = -ESRCH;
455
456    if (lock_task_sighand(child, &flags)) {
457        error = -EINVAL;
458        if (likely(child->last_siginfo != NULL)) {
459            *child->last_siginfo = *info;
460            error = 0;
461        }
462        unlock_task_sighand(child, &flags);
463    }
464    return error;
465}
466
467
468#ifdef PTRACE_SINGLESTEP
469#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
470#else
471#define is_singlestep(request) 0
472#endif
473
474#ifdef PTRACE_SINGLEBLOCK
475#define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
476#else
477#define is_singleblock(request) 0
478#endif
479
480#ifdef PTRACE_SYSEMU
481#define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
482#else
483#define is_sysemu_singlestep(request) 0
484#endif
485
486static int ptrace_resume(struct task_struct *child, long request,
487             unsigned long data)
488{
489    if (!valid_signal(data))
490        return -EIO;
491
492    if (request == PTRACE_SYSCALL)
493        set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
494    else
495        clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
496
497#ifdef TIF_SYSCALL_EMU
498    if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)
499        set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
500    else
501        clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
502#endif
503
504    if (is_singleblock(request)) {
505        if (unlikely(!arch_has_block_step()))
506            return -EIO;
507        user_enable_block_step(child);
508    } else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
509        if (unlikely(!arch_has_single_step()))
510            return -EIO;
511        user_enable_single_step(child);
512    } else {
513        user_disable_single_step(child);
514    }
515
516    child->exit_code = data;
517    wake_up_process(child);
518
519    return 0;
520}
521
522#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
523
524static const struct user_regset *
525find_regset(const struct user_regset_view *view, unsigned int type)
526{
527    const struct user_regset *regset;
528    int n;
529
530    for (n = 0; n < view->n; ++n) {
531        regset = view->regsets + n;
532        if (regset->core_note_type == type)
533            return regset;
534    }
535
536    return NULL;
537}
538
539static int ptrace_regset(struct task_struct *task, int req, unsigned int type,
540             struct iovec *kiov)
541{
542    const struct user_regset_view *view = task_user_regset_view(task);
543    const struct user_regset *regset = find_regset(view, type);
544    int regset_no;
545
546    if (!regset || (kiov->iov_len % regset->size) != 0)
547        return -EINVAL;
548
549    regset_no = regset - view->regsets;
550    kiov->iov_len = min(kiov->iov_len,
551                (__kernel_size_t) (regset->n * regset->size));
552
553    if (req == PTRACE_GETREGSET)
554        return copy_regset_to_user(task, view, regset_no, 0,
555                       kiov->iov_len, kiov->iov_base);
556    else
557        return copy_regset_from_user(task, view, regset_no, 0,
558                         kiov->iov_len, kiov->iov_base);
559}
560
561#endif
562
563int ptrace_request(struct task_struct *child, long request,
564           unsigned long addr, unsigned long data)
565{
566    int ret = -EIO;
567    siginfo_t siginfo;
568    void __user *datavp = (void __user *) data;
569    unsigned long __user *datalp = datavp;
570
571    switch (request) {
572    case PTRACE_PEEKTEXT:
573    case PTRACE_PEEKDATA:
574        return generic_ptrace_peekdata(child, addr, data);
575    case PTRACE_POKETEXT:
576    case PTRACE_POKEDATA:
577        return generic_ptrace_pokedata(child, addr, data);
578
579#ifdef PTRACE_OLDSETOPTIONS
580    case PTRACE_OLDSETOPTIONS:
581#endif
582    case PTRACE_SETOPTIONS:
583        ret = ptrace_setoptions(child, data);
584        break;
585    case PTRACE_GETEVENTMSG:
586        ret = put_user(child->ptrace_message, datalp);
587        break;
588
589    case PTRACE_GETSIGINFO:
590        ret = ptrace_getsiginfo(child, &siginfo);
591        if (!ret)
592            ret = copy_siginfo_to_user(datavp, &siginfo);
593        break;
594
595    case PTRACE_SETSIGINFO:
596        if (copy_from_user(&siginfo, datavp, sizeof siginfo))
597            ret = -EFAULT;
598        else
599            ret = ptrace_setsiginfo(child, &siginfo);
600        break;
601
602    case PTRACE_DETACH: /* detach a process that was attached. */
603        ret = ptrace_detach(child, data);
604        break;
605
606#ifdef CONFIG_BINFMT_ELF_FDPIC
607    case PTRACE_GETFDPIC: {
608        struct mm_struct *mm = get_task_mm(child);
609        unsigned long tmp = 0;
610
611        ret = -ESRCH;
612        if (!mm)
613            break;
614
615        switch (addr) {
616        case PTRACE_GETFDPIC_EXEC:
617            tmp = mm->context.exec_fdpic_loadmap;
618            break;
619        case PTRACE_GETFDPIC_INTERP:
620            tmp = mm->context.interp_fdpic_loadmap;
621            break;
622        default:
623            break;
624        }
625        mmput(mm);
626
627        ret = put_user(tmp, datalp);
628        break;
629    }
630#endif
631
632#ifdef PTRACE_SINGLESTEP
633    case PTRACE_SINGLESTEP:
634#endif
635#ifdef PTRACE_SINGLEBLOCK
636    case PTRACE_SINGLEBLOCK:
637#endif
638#ifdef PTRACE_SYSEMU
639    case PTRACE_SYSEMU:
640    case PTRACE_SYSEMU_SINGLESTEP:
641#endif
642    case PTRACE_SYSCALL:
643    case PTRACE_CONT:
644        return ptrace_resume(child, request, data);
645
646    case PTRACE_KILL:
647        if (child->exit_state) /* already dead */
648            return 0;
649        return ptrace_resume(child, request, SIGKILL);
650
651#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
652    case PTRACE_GETREGSET:
653    case PTRACE_SETREGSET:
654    {
655        struct iovec kiov;
656        struct iovec __user *uiov = datavp;
657
658        if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
659            return -EFAULT;
660
661        if (__get_user(kiov.iov_base, &uiov->iov_base) ||
662            __get_user(kiov.iov_len, &uiov->iov_len))
663            return -EFAULT;
664
665        ret = ptrace_regset(child, request, addr, &kiov);
666        if (!ret)
667            ret = __put_user(kiov.iov_len, &uiov->iov_len);
668        break;
669    }
670#endif
671    default:
672        break;
673    }
674
675    return ret;
676}
677
678static struct task_struct *ptrace_get_task_struct(pid_t pid)
679{
680    struct task_struct *child;
681
682    rcu_read_lock();
683    child = find_task_by_vpid(pid);
684    if (child)
685        get_task_struct(child);
686    rcu_read_unlock();
687
688    if (!child)
689        return ERR_PTR(-ESRCH);
690    return child;
691}
692
693#ifndef arch_ptrace_attach
694#define arch_ptrace_attach(child) do { } while (0)
695#endif
696
697SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
698        unsigned long, data)
699{
700    struct task_struct *child;
701    long ret;
702
703    if (request == PTRACE_TRACEME) {
704        ret = ptrace_traceme();
705        if (!ret)
706            arch_ptrace_attach(current);
707        goto out;
708    }
709
710    child = ptrace_get_task_struct(pid);
711    if (IS_ERR(child)) {
712        ret = PTR_ERR(child);
713        goto out;
714    }
715
716    if (request == PTRACE_ATTACH) {
717        ret = ptrace_attach(child);
718        /*
719         * Some architectures need to do book-keeping after
720         * a ptrace attach.
721         */
722        if (!ret)
723            arch_ptrace_attach(child);
724        goto out_put_task_struct;
725    }
726
727    ret = ptrace_check_attach(child, request == PTRACE_KILL);
728    if (ret < 0)
729        goto out_put_task_struct;
730
731    ret = arch_ptrace(child, request, addr, data);
732
733 out_put_task_struct:
734    put_task_struct(child);
735 out:
736    return ret;
737}
738
739int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr,
740                unsigned long data)
741{
742    unsigned long tmp;
743    int copied;
744
745    copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0);
746    if (copied != sizeof(tmp))
747        return -EIO;
748    return put_user(tmp, (unsigned long __user *)data);
749}
750
751int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
752                unsigned long data)
753{
754    int copied;
755
756    copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);
757    return (copied == sizeof(data)) ? 0 : -EIO;
758}
759
760#if defined CONFIG_COMPAT
761#include <linux/compat.h>
762
763int compat_ptrace_request(struct task_struct *child, compat_long_t request,
764              compat_ulong_t addr, compat_ulong_t data)
765{
766    compat_ulong_t __user *datap = compat_ptr(data);
767    compat_ulong_t word;
768    siginfo_t siginfo;
769    int ret;
770
771    switch (request) {
772    case PTRACE_PEEKTEXT:
773    case PTRACE_PEEKDATA:
774        ret = access_process_vm(child, addr, &word, sizeof(word), 0);
775        if (ret != sizeof(word))
776            ret = -EIO;
777        else
778            ret = put_user(word, datap);
779        break;
780
781    case PTRACE_POKETEXT:
782    case PTRACE_POKEDATA:
783        ret = access_process_vm(child, addr, &data, sizeof(data), 1);
784        ret = (ret != sizeof(data) ? -EIO : 0);
785        break;
786
787    case PTRACE_GETEVENTMSG:
788        ret = put_user((compat_ulong_t) child->ptrace_message, datap);
789        break;
790
791    case PTRACE_GETSIGINFO:
792        ret = ptrace_getsiginfo(child, &siginfo);
793        if (!ret)
794            ret = copy_siginfo_to_user32(
795                (struct compat_siginfo __user *) datap,
796                &siginfo);
797        break;
798
799    case PTRACE_SETSIGINFO:
800        memset(&siginfo, 0, sizeof siginfo);
801        if (copy_siginfo_from_user32(
802                &siginfo, (struct compat_siginfo __user *) datap))
803            ret = -EFAULT;
804        else
805            ret = ptrace_setsiginfo(child, &siginfo);
806        break;
807#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
808    case PTRACE_GETREGSET:
809    case PTRACE_SETREGSET:
810    {
811        struct iovec kiov;
812        struct compat_iovec __user *uiov =
813            (struct compat_iovec __user *) datap;
814        compat_uptr_t ptr;
815        compat_size_t len;
816
817        if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
818            return -EFAULT;
819
820        if (__get_user(ptr, &uiov->iov_base) ||
821            __get_user(len, &uiov->iov_len))
822            return -EFAULT;
823
824        kiov.iov_base = compat_ptr(ptr);
825        kiov.iov_len = len;
826
827        ret = ptrace_regset(child, request, addr, &kiov);
828        if (!ret)
829            ret = __put_user(kiov.iov_len, &uiov->iov_len);
830        break;
831    }
832#endif
833
834    default:
835        ret = ptrace_request(child, request, addr, data);
836    }
837
838    return ret;
839}
840
841asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
842                  compat_long_t addr, compat_long_t data)
843{
844    struct task_struct *child;
845    long ret;
846
847    if (request == PTRACE_TRACEME) {
848        ret = ptrace_traceme();
849        goto out;
850    }
851
852    child = ptrace_get_task_struct(pid);
853    if (IS_ERR(child)) {
854        ret = PTR_ERR(child);
855        goto out;
856    }
857
858    if (request == PTRACE_ATTACH) {
859        ret = ptrace_attach(child);
860        /*
861         * Some architectures need to do book-keeping after
862         * a ptrace attach.
863         */
864        if (!ret)
865            arch_ptrace_attach(child);
866        goto out_put_task_struct;
867    }
868
869    ret = ptrace_check_attach(child, request == PTRACE_KILL);
870    if (!ret)
871        ret = compat_arch_ptrace(child, request, addr, data);
872
873 out_put_task_struct:
874    put_task_struct(child);
875 out:
876    return ret;
877}
878#endif /* CONFIG_COMPAT */
879

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