11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/kernel/ptrace.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Common interfaces for "ptrace()" which we do not want 71da177e4SLinus Torvalds * to continually duplicate across every architecture. 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 10c59ede7bSRandy.Dunlap #include <linux/capability.h> 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/sched.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 141da177e4SLinus Torvalds #include <linux/mm.h> 151da177e4SLinus Torvalds #include <linux/highmem.h> 161da177e4SLinus Torvalds #include <linux/pagemap.h> 171da177e4SLinus Torvalds #include <linux/ptrace.h> 181da177e4SLinus Torvalds #include <linux/security.h> 197ed20e1aSJesper Juhl #include <linux/signal.h> 20a5cb013dSAl Viro #include <linux/audit.h> 21b488893aSPavel Emelyanov #include <linux/pid_namespace.h> 22f17d30a8SAdrian Bunk #include <linux/syscalls.h> 233a709703SRoland McGrath #include <linux/uaccess.h> 242225a122SSuresh Siddha #include <linux/regset.h> 251da177e4SLinus Torvalds 26bf53de90SMarkus Metzger 27bf53de90SMarkus Metzger /* 281da177e4SLinus Torvalds * ptrace a task: make the debugger its new parent and 291da177e4SLinus Torvalds * move it to the ptrace list. 301da177e4SLinus Torvalds * 311da177e4SLinus Torvalds * Must be called with the tasklist lock write-held. 321da177e4SLinus Torvalds */ 3336c8b586SIngo Molnar void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) 341da177e4SLinus Torvalds { 35f470021aSRoland McGrath BUG_ON(!list_empty(&child->ptrace_entry)); 36f470021aSRoland McGrath list_add(&child->ptrace_entry, &new_parent->ptraced); 371da177e4SLinus Torvalds child->parent = new_parent; 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds /* 411da177e4SLinus Torvalds * Turn a tracing stop into a normal stop now, since with no tracer there 421da177e4SLinus Torvalds * would be no way to wake it up with SIGCONT or SIGKILL. If there was a 431da177e4SLinus Torvalds * signal sent that would resume the child, but didn't because it was in 441da177e4SLinus Torvalds * TASK_TRACED, resume it now. 451da177e4SLinus Torvalds * Requires that irqs be disabled. 461da177e4SLinus Torvalds */ 47b747c8c1SAdrian Bunk static void ptrace_untrace(struct task_struct *child) 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds spin_lock(&child->sighand->siglock); 506618a3e2SMatthew Wilcox if (task_is_traced(child)) { 511ee11844SOleg Nesterov /* 521ee11844SOleg Nesterov * If the group stop is completed or in progress, 531ee11844SOleg Nesterov * this thread was already counted as stopped. 541ee11844SOleg Nesterov */ 551ee11844SOleg Nesterov if (child->signal->flags & SIGNAL_STOP_STOPPED || 561ee11844SOleg Nesterov child->signal->group_stop_count) 57d9ae90acSOleg Nesterov __set_task_state(child, TASK_STOPPED); 581ee11844SOleg Nesterov else 591da177e4SLinus Torvalds signal_wake_up(child, 1); 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds spin_unlock(&child->sighand->siglock); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* 651da177e4SLinus Torvalds * unptrace a task: move it back to its original parent and 661da177e4SLinus Torvalds * remove it from the ptrace list. 671da177e4SLinus Torvalds * 681da177e4SLinus Torvalds * Must be called with the tasklist lock write-held. 691da177e4SLinus Torvalds */ 7036c8b586SIngo Molnar void __ptrace_unlink(struct task_struct *child) 711da177e4SLinus Torvalds { 725ecfbae0SOleg Nesterov BUG_ON(!child->ptrace); 735ecfbae0SOleg Nesterov 741da177e4SLinus Torvalds child->ptrace = 0; 751da177e4SLinus Torvalds child->parent = child->real_parent; 76f470021aSRoland McGrath list_del_init(&child->ptrace_entry); 771da177e4SLinus Torvalds 786618a3e2SMatthew Wilcox if (task_is_traced(child)) 791da177e4SLinus Torvalds ptrace_untrace(child); 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* 831da177e4SLinus Torvalds * Check that we have indeed attached to the thing.. 841da177e4SLinus Torvalds */ 851da177e4SLinus Torvalds int ptrace_check_attach(struct task_struct *child, int kill) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds int ret = -ESRCH; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /* 901da177e4SLinus Torvalds * We take the read lock around doing both checks to close a 911da177e4SLinus Torvalds * possible race where someone else was tracing our child and 921da177e4SLinus Torvalds * detached between these two checks. After this locked check, 931da177e4SLinus Torvalds * we are sure that this is our traced child and that can only 941da177e4SLinus Torvalds * be changed by us so it's not changing right after this. 951da177e4SLinus Torvalds */ 961da177e4SLinus Torvalds read_lock(&tasklist_lock); 97c0c0b649SOleg Nesterov if ((child->ptrace & PT_PTRACED) && child->parent == current) { 981da177e4SLinus Torvalds ret = 0; 99c0c0b649SOleg Nesterov /* 100c0c0b649SOleg Nesterov * child->sighand can't be NULL, release_task() 101c0c0b649SOleg Nesterov * does ptrace_unlink() before __exit_signal(). 102c0c0b649SOleg Nesterov */ 1031da177e4SLinus Torvalds spin_lock_irq(&child->sighand->siglock); 104d9ae90acSOleg Nesterov if (task_is_stopped(child)) 1051da177e4SLinus Torvalds child->state = TASK_TRACED; 106d9ae90acSOleg Nesterov else if (!task_is_traced(child) && !kill) 1071da177e4SLinus Torvalds ret = -ESRCH; 1081da177e4SLinus Torvalds spin_unlock_irq(&child->sighand->siglock); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds read_unlock(&tasklist_lock); 1111da177e4SLinus Torvalds 112d9ae90acSOleg Nesterov if (!ret && !kill) 11385ba2d86SRoland McGrath ret = wait_task_inactive(child, TASK_TRACED) ? 0 : -ESRCH; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* All systems go.. */ 1161da177e4SLinus Torvalds return ret; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 119006ebb40SStephen Smalley int __ptrace_may_access(struct task_struct *task, unsigned int mode) 120ab8d11beSMiklos Szeredi { 121c69e8d9cSDavid Howells const struct cred *cred = current_cred(), *tcred; 122b6dff3ecSDavid Howells 123df26c40eSEric W. Biederman /* May we inspect the given task? 124df26c40eSEric W. Biederman * This check is used both for attaching with ptrace 125df26c40eSEric W. Biederman * and for allowing access to sensitive information in /proc. 126df26c40eSEric W. Biederman * 127df26c40eSEric W. Biederman * ptrace_attach denies several cases that /proc allows 128df26c40eSEric W. Biederman * because setting up the necessary parent/child relationship 129df26c40eSEric W. Biederman * or halting the specified task is impossible. 130df26c40eSEric W. Biederman */ 131df26c40eSEric W. Biederman int dumpable = 0; 132df26c40eSEric W. Biederman /* Don't let security modules deny introspection */ 133df26c40eSEric W. Biederman if (task == current) 134df26c40eSEric W. Biederman return 0; 135c69e8d9cSDavid Howells rcu_read_lock(); 136c69e8d9cSDavid Howells tcred = __task_cred(task); 1378409cca7SSerge E. Hallyn if (cred->user->user_ns == tcred->user->user_ns && 1388409cca7SSerge E. Hallyn (cred->uid == tcred->euid && 1398409cca7SSerge E. Hallyn cred->uid == tcred->suid && 1408409cca7SSerge E. Hallyn cred->uid == tcred->uid && 1418409cca7SSerge E. Hallyn cred->gid == tcred->egid && 1428409cca7SSerge E. Hallyn cred->gid == tcred->sgid && 1438409cca7SSerge E. Hallyn cred->gid == tcred->gid)) 1448409cca7SSerge E. Hallyn goto ok; 1458409cca7SSerge E. Hallyn if (ns_capable(tcred->user->user_ns, CAP_SYS_PTRACE)) 1468409cca7SSerge E. Hallyn goto ok; 147c69e8d9cSDavid Howells rcu_read_unlock(); 148ab8d11beSMiklos Szeredi return -EPERM; 1498409cca7SSerge E. Hallyn ok: 150c69e8d9cSDavid Howells rcu_read_unlock(); 151ab8d11beSMiklos Szeredi smp_rmb(); 152df26c40eSEric W. Biederman if (task->mm) 1536c5d5238SKawai, Hidehiro dumpable = get_dumpable(task->mm); 1548409cca7SSerge E. Hallyn if (!dumpable && !task_ns_capable(task, CAP_SYS_PTRACE)) 155ab8d11beSMiklos Szeredi return -EPERM; 156ab8d11beSMiklos Szeredi 1579e48858fSIngo Molnar return security_ptrace_access_check(task, mode); 158ab8d11beSMiklos Szeredi } 159ab8d11beSMiklos Szeredi 160006ebb40SStephen Smalley bool ptrace_may_access(struct task_struct *task, unsigned int mode) 161ab8d11beSMiklos Szeredi { 162ab8d11beSMiklos Szeredi int err; 163ab8d11beSMiklos Szeredi task_lock(task); 164006ebb40SStephen Smalley err = __ptrace_may_access(task, mode); 165ab8d11beSMiklos Szeredi task_unlock(task); 1663a709703SRoland McGrath return !err; 167ab8d11beSMiklos Szeredi } 168ab8d11beSMiklos Szeredi 169e3e89cc5SLinus Torvalds static int ptrace_attach(struct task_struct *task) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds int retval; 172f5b40e36SLinus Torvalds 173a5cb013dSAl Viro audit_ptrace(task); 174a5cb013dSAl Viro 1751da177e4SLinus Torvalds retval = -EPERM; 176b79b7ba9SOleg Nesterov if (unlikely(task->flags & PF_KTHREAD)) 177b79b7ba9SOleg Nesterov goto out; 178bac0abd6SPavel Emelyanov if (same_thread_group(task, current)) 179f5b40e36SLinus Torvalds goto out; 180f5b40e36SLinus Torvalds 181f2f0b00aSOleg Nesterov /* 182f2f0b00aSOleg Nesterov * Protect exec's credential calculations against our interference; 1835e751e99SDavid Howells * interference; SUID, SGID and LSM creds get determined differently 1845e751e99SDavid Howells * under ptrace. 185d84f4f99SDavid Howells */ 186793285fcSOleg Nesterov retval = -ERESTARTNOINTR; 1879b1bf12dSKOSAKI Motohiro if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) 188d84f4f99SDavid Howells goto out; 1894b105cbbSOleg Nesterov 190f5b40e36SLinus Torvalds task_lock(task); 191006ebb40SStephen Smalley retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); 1924b105cbbSOleg Nesterov task_unlock(task); 1931da177e4SLinus Torvalds if (retval) 1944b105cbbSOleg Nesterov goto unlock_creds; 1951da177e4SLinus Torvalds 1964b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 197b79b7ba9SOleg Nesterov retval = -EPERM; 198b79b7ba9SOleg Nesterov if (unlikely(task->exit_state)) 1994b105cbbSOleg Nesterov goto unlock_tasklist; 200f2f0b00aSOleg Nesterov if (task->ptrace) 2014b105cbbSOleg Nesterov goto unlock_tasklist; 202b79b7ba9SOleg Nesterov 203f2f0b00aSOleg Nesterov task->ptrace = PT_PTRACED; 2048409cca7SSerge E. Hallyn if (task_ns_capable(task, CAP_SYS_PTRACE)) 2051da177e4SLinus Torvalds task->ptrace |= PT_PTRACE_CAP; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds __ptrace_link(task, current); 20833e9fc7dSOleg Nesterov send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); 209b79b7ba9SOleg Nesterov 210b79b7ba9SOleg Nesterov retval = 0; 2114b105cbbSOleg Nesterov unlock_tasklist: 2124b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2134b105cbbSOleg Nesterov unlock_creds: 2149b1bf12dSKOSAKI Motohiro mutex_unlock(&task->signal->cred_guard_mutex); 215f5b40e36SLinus Torvalds out: 2161da177e4SLinus Torvalds return retval; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 219f2f0b00aSOleg Nesterov /** 220f2f0b00aSOleg Nesterov * ptrace_traceme -- helper for PTRACE_TRACEME 221f2f0b00aSOleg Nesterov * 222f2f0b00aSOleg Nesterov * Performs checks and sets PT_PTRACED. 223f2f0b00aSOleg Nesterov * Should be used by all ptrace implementations for PTRACE_TRACEME. 224f2f0b00aSOleg Nesterov */ 225e3e89cc5SLinus Torvalds static int ptrace_traceme(void) 226f2f0b00aSOleg Nesterov { 227f2f0b00aSOleg Nesterov int ret = -EPERM; 228f2f0b00aSOleg Nesterov 2294b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 2304b105cbbSOleg Nesterov /* Are we already being traced? */ 231f2f0b00aSOleg Nesterov if (!current->ptrace) { 232f2f0b00aSOleg Nesterov ret = security_ptrace_traceme(current->parent); 233f2f0b00aSOleg Nesterov /* 234f2f0b00aSOleg Nesterov * Check PF_EXITING to ensure ->real_parent has not passed 235f2f0b00aSOleg Nesterov * exit_ptrace(). Otherwise we don't report the error but 236f2f0b00aSOleg Nesterov * pretend ->real_parent untraces us right after return. 237f2f0b00aSOleg Nesterov */ 238f2f0b00aSOleg Nesterov if (!ret && !(current->real_parent->flags & PF_EXITING)) { 239f2f0b00aSOleg Nesterov current->ptrace = PT_PTRACED; 240f2f0b00aSOleg Nesterov __ptrace_link(current, current->real_parent); 241f2f0b00aSOleg Nesterov } 242f2f0b00aSOleg Nesterov } 2434b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2444b105cbbSOleg Nesterov 245f2f0b00aSOleg Nesterov return ret; 246f2f0b00aSOleg Nesterov } 247f2f0b00aSOleg Nesterov 24839c626aeSOleg Nesterov /* 24939c626aeSOleg Nesterov * Called with irqs disabled, returns true if childs should reap themselves. 25039c626aeSOleg Nesterov */ 25139c626aeSOleg Nesterov static int ignoring_children(struct sighand_struct *sigh) 25239c626aeSOleg Nesterov { 25339c626aeSOleg Nesterov int ret; 25439c626aeSOleg Nesterov spin_lock(&sigh->siglock); 25539c626aeSOleg Nesterov ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || 25639c626aeSOleg Nesterov (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); 25739c626aeSOleg Nesterov spin_unlock(&sigh->siglock); 25839c626aeSOleg Nesterov return ret; 25939c626aeSOleg Nesterov } 26039c626aeSOleg Nesterov 26139c626aeSOleg Nesterov /* 26239c626aeSOleg Nesterov * Called with tasklist_lock held for writing. 26339c626aeSOleg Nesterov * Unlink a traced task, and clean it up if it was a traced zombie. 26439c626aeSOleg Nesterov * Return true if it needs to be reaped with release_task(). 26539c626aeSOleg Nesterov * (We can't call release_task() here because we already hold tasklist_lock.) 26639c626aeSOleg Nesterov * 26739c626aeSOleg Nesterov * If it's a zombie, our attachedness prevented normal parent notification 26839c626aeSOleg Nesterov * or self-reaping. Do notification now if it would have happened earlier. 26939c626aeSOleg Nesterov * If it should reap itself, return true. 27039c626aeSOleg Nesterov * 271a7f0765eSOleg Nesterov * If it's our own child, there is no notification to do. But if our normal 272a7f0765eSOleg Nesterov * children self-reap, then this child was prevented by ptrace and we must 273a7f0765eSOleg Nesterov * reap it now, in that case we must also wake up sub-threads sleeping in 274a7f0765eSOleg Nesterov * do_wait(). 27539c626aeSOleg Nesterov */ 27639c626aeSOleg Nesterov static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) 27739c626aeSOleg Nesterov { 27839c626aeSOleg Nesterov __ptrace_unlink(p); 27939c626aeSOleg Nesterov 28039c626aeSOleg Nesterov if (p->exit_state == EXIT_ZOMBIE) { 28139c626aeSOleg Nesterov if (!task_detached(p) && thread_group_empty(p)) { 28239c626aeSOleg Nesterov if (!same_thread_group(p->real_parent, tracer)) 28339c626aeSOleg Nesterov do_notify_parent(p, p->exit_signal); 284a7f0765eSOleg Nesterov else if (ignoring_children(tracer->sighand)) { 285a7f0765eSOleg Nesterov __wake_up_parent(p, tracer); 28639c626aeSOleg Nesterov p->exit_signal = -1; 28739c626aeSOleg Nesterov } 288a7f0765eSOleg Nesterov } 28939c626aeSOleg Nesterov if (task_detached(p)) { 29039c626aeSOleg Nesterov /* Mark it as in the process of being reaped. */ 29139c626aeSOleg Nesterov p->exit_state = EXIT_DEAD; 29239c626aeSOleg Nesterov return true; 29339c626aeSOleg Nesterov } 29439c626aeSOleg Nesterov } 29539c626aeSOleg Nesterov 29639c626aeSOleg Nesterov return false; 29739c626aeSOleg Nesterov } 29839c626aeSOleg Nesterov 299e3e89cc5SLinus Torvalds static int ptrace_detach(struct task_struct *child, unsigned int data) 3001da177e4SLinus Torvalds { 30139c626aeSOleg Nesterov bool dead = false; 3024576145cSOleg Nesterov 3037ed20e1aSJesper Juhl if (!valid_signal(data)) 3041da177e4SLinus Torvalds return -EIO; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* Architecture-specific hardware disable .. */ 3071da177e4SLinus Torvalds ptrace_disable(child); 3087d941432SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 3091da177e4SLinus Torvalds 31095c3eb76SOleg Nesterov write_lock_irq(&tasklist_lock); 31139c626aeSOleg Nesterov /* 31239c626aeSOleg Nesterov * This child can be already killed. Make sure de_thread() or 31339c626aeSOleg Nesterov * our sub-thread doing do_wait() didn't do release_task() yet. 31439c626aeSOleg Nesterov */ 31595c3eb76SOleg Nesterov if (child->ptrace) { 31695c3eb76SOleg Nesterov child->exit_code = data; 3174576145cSOleg Nesterov dead = __ptrace_detach(current, child); 318edaba2c5SOleg Nesterov if (!child->exit_state) 31901e05e9aSTejun Heo wake_up_state(child, TASK_TRACED | TASK_STOPPED); 32095c3eb76SOleg Nesterov } 3211da177e4SLinus Torvalds write_unlock_irq(&tasklist_lock); 3221da177e4SLinus Torvalds 3234576145cSOleg Nesterov if (unlikely(dead)) 3244576145cSOleg Nesterov release_task(child); 3254576145cSOleg Nesterov 3261da177e4SLinus Torvalds return 0; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 32939c626aeSOleg Nesterov /* 330c7e49c14SOleg Nesterov * Detach all tasks we were using ptrace on. Called with tasklist held 331c7e49c14SOleg Nesterov * for writing, and returns with it held too. But note it can release 332c7e49c14SOleg Nesterov * and reacquire the lock. 33339c626aeSOleg Nesterov */ 33439c626aeSOleg Nesterov void exit_ptrace(struct task_struct *tracer) 335c4b5ed25SNamhyung Kim __releases(&tasklist_lock) 336c4b5ed25SNamhyung Kim __acquires(&tasklist_lock) 33739c626aeSOleg Nesterov { 33839c626aeSOleg Nesterov struct task_struct *p, *n; 33939c626aeSOleg Nesterov LIST_HEAD(ptrace_dead); 34039c626aeSOleg Nesterov 341c7e49c14SOleg Nesterov if (likely(list_empty(&tracer->ptraced))) 342c7e49c14SOleg Nesterov return; 343c7e49c14SOleg Nesterov 34439c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { 34539c626aeSOleg Nesterov if (__ptrace_detach(tracer, p)) 34639c626aeSOleg Nesterov list_add(&p->ptrace_entry, &ptrace_dead); 34739c626aeSOleg Nesterov } 34839c626aeSOleg Nesterov 349c7e49c14SOleg Nesterov write_unlock_irq(&tasklist_lock); 35039c626aeSOleg Nesterov BUG_ON(!list_empty(&tracer->ptraced)); 35139c626aeSOleg Nesterov 35239c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) { 35339c626aeSOleg Nesterov list_del_init(&p->ptrace_entry); 35439c626aeSOleg Nesterov release_task(p); 35539c626aeSOleg Nesterov } 356c7e49c14SOleg Nesterov 357c7e49c14SOleg Nesterov write_lock_irq(&tasklist_lock); 35839c626aeSOleg Nesterov } 35939c626aeSOleg Nesterov 3601da177e4SLinus Torvalds int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) 3611da177e4SLinus Torvalds { 3621da177e4SLinus Torvalds int copied = 0; 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds while (len > 0) { 3651da177e4SLinus Torvalds char buf[128]; 3661da177e4SLinus Torvalds int this_len, retval; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 3691da177e4SLinus Torvalds retval = access_process_vm(tsk, src, buf, this_len, 0); 3701da177e4SLinus Torvalds if (!retval) { 3711da177e4SLinus Torvalds if (copied) 3721da177e4SLinus Torvalds break; 3731da177e4SLinus Torvalds return -EIO; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds if (copy_to_user(dst, buf, retval)) 3761da177e4SLinus Torvalds return -EFAULT; 3771da177e4SLinus Torvalds copied += retval; 3781da177e4SLinus Torvalds src += retval; 3791da177e4SLinus Torvalds dst += retval; 3801da177e4SLinus Torvalds len -= retval; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds return copied; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) 3861da177e4SLinus Torvalds { 3871da177e4SLinus Torvalds int copied = 0; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds while (len > 0) { 3901da177e4SLinus Torvalds char buf[128]; 3911da177e4SLinus Torvalds int this_len, retval; 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 3941da177e4SLinus Torvalds if (copy_from_user(buf, src, this_len)) 3951da177e4SLinus Torvalds return -EFAULT; 3961da177e4SLinus Torvalds retval = access_process_vm(tsk, dst, buf, this_len, 1); 3971da177e4SLinus Torvalds if (!retval) { 3981da177e4SLinus Torvalds if (copied) 3991da177e4SLinus Torvalds break; 4001da177e4SLinus Torvalds return -EIO; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds copied += retval; 4031da177e4SLinus Torvalds src += retval; 4041da177e4SLinus Torvalds dst += retval; 4051da177e4SLinus Torvalds len -= retval; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds return copied; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4104abf9869SNamhyung Kim static int ptrace_setoptions(struct task_struct *child, unsigned long data) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds child->ptrace &= ~PT_TRACE_MASK; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds if (data & PTRACE_O_TRACESYSGOOD) 4151da177e4SLinus Torvalds child->ptrace |= PT_TRACESYSGOOD; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if (data & PTRACE_O_TRACEFORK) 4181da177e4SLinus Torvalds child->ptrace |= PT_TRACE_FORK; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORK) 4211da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds if (data & PTRACE_O_TRACECLONE) 4241da177e4SLinus Torvalds child->ptrace |= PT_TRACE_CLONE; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXEC) 4271da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXEC; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORKDONE) 4301da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK_DONE; 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXIT) 4331da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXIT; 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds return (data & ~PTRACE_O_MASK) ? -EINVAL : 0; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 438e16b2781SRoland McGrath static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) 4391da177e4SLinus Torvalds { 440e4961254SOleg Nesterov unsigned long flags; 4411da177e4SLinus Torvalds int error = -ESRCH; 4421da177e4SLinus Torvalds 443e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4441da177e4SLinus Torvalds error = -EINVAL; 4451da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 446e16b2781SRoland McGrath *info = *child->last_siginfo; 4471da177e4SLinus Torvalds error = 0; 4481da177e4SLinus Torvalds } 449e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds return error; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 454e16b2781SRoland McGrath static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) 4551da177e4SLinus Torvalds { 456e4961254SOleg Nesterov unsigned long flags; 4571da177e4SLinus Torvalds int error = -ESRCH; 4581da177e4SLinus Torvalds 459e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4601da177e4SLinus Torvalds error = -EINVAL; 4611da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 462e16b2781SRoland McGrath *child->last_siginfo = *info; 4631da177e4SLinus Torvalds error = 0; 4641da177e4SLinus Torvalds } 465e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds return error; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 47036df29d7SRoland McGrath 47136df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 47236df29d7SRoland McGrath #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) 47336df29d7SRoland McGrath #else 47436df29d7SRoland McGrath #define is_singlestep(request) 0 47536df29d7SRoland McGrath #endif 47636df29d7SRoland McGrath 4775b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 4785b88abbfSRoland McGrath #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) 4795b88abbfSRoland McGrath #else 4805b88abbfSRoland McGrath #define is_singleblock(request) 0 4815b88abbfSRoland McGrath #endif 4825b88abbfSRoland McGrath 48336df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 48436df29d7SRoland McGrath #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) 48536df29d7SRoland McGrath #else 48636df29d7SRoland McGrath #define is_sysemu_singlestep(request) 0 48736df29d7SRoland McGrath #endif 48836df29d7SRoland McGrath 4894abf9869SNamhyung Kim static int ptrace_resume(struct task_struct *child, long request, 4904abf9869SNamhyung Kim unsigned long data) 49136df29d7SRoland McGrath { 49236df29d7SRoland McGrath if (!valid_signal(data)) 49336df29d7SRoland McGrath return -EIO; 49436df29d7SRoland McGrath 49536df29d7SRoland McGrath if (request == PTRACE_SYSCALL) 49636df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 49736df29d7SRoland McGrath else 49836df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 49936df29d7SRoland McGrath 50036df29d7SRoland McGrath #ifdef TIF_SYSCALL_EMU 50136df29d7SRoland McGrath if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) 50236df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 50336df29d7SRoland McGrath else 50436df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 50536df29d7SRoland McGrath #endif 50636df29d7SRoland McGrath 5075b88abbfSRoland McGrath if (is_singleblock(request)) { 5085b88abbfSRoland McGrath if (unlikely(!arch_has_block_step())) 5095b88abbfSRoland McGrath return -EIO; 5105b88abbfSRoland McGrath user_enable_block_step(child); 5115b88abbfSRoland McGrath } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { 51236df29d7SRoland McGrath if (unlikely(!arch_has_single_step())) 51336df29d7SRoland McGrath return -EIO; 51436df29d7SRoland McGrath user_enable_single_step(child); 5153a709703SRoland McGrath } else { 51636df29d7SRoland McGrath user_disable_single_step(child); 5173a709703SRoland McGrath } 51836df29d7SRoland McGrath 51936df29d7SRoland McGrath child->exit_code = data; 52036df29d7SRoland McGrath wake_up_process(child); 52136df29d7SRoland McGrath 52236df29d7SRoland McGrath return 0; 52336df29d7SRoland McGrath } 52436df29d7SRoland McGrath 5252225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 5262225a122SSuresh Siddha 5272225a122SSuresh Siddha static const struct user_regset * 5282225a122SSuresh Siddha find_regset(const struct user_regset_view *view, unsigned int type) 5292225a122SSuresh Siddha { 5302225a122SSuresh Siddha const struct user_regset *regset; 5312225a122SSuresh Siddha int n; 5322225a122SSuresh Siddha 5332225a122SSuresh Siddha for (n = 0; n < view->n; ++n) { 5342225a122SSuresh Siddha regset = view->regsets + n; 5352225a122SSuresh Siddha if (regset->core_note_type == type) 5362225a122SSuresh Siddha return regset; 5372225a122SSuresh Siddha } 5382225a122SSuresh Siddha 5392225a122SSuresh Siddha return NULL; 5402225a122SSuresh Siddha } 5412225a122SSuresh Siddha 5422225a122SSuresh Siddha static int ptrace_regset(struct task_struct *task, int req, unsigned int type, 5432225a122SSuresh Siddha struct iovec *kiov) 5442225a122SSuresh Siddha { 5452225a122SSuresh Siddha const struct user_regset_view *view = task_user_regset_view(task); 5462225a122SSuresh Siddha const struct user_regset *regset = find_regset(view, type); 5472225a122SSuresh Siddha int regset_no; 5482225a122SSuresh Siddha 5492225a122SSuresh Siddha if (!regset || (kiov->iov_len % regset->size) != 0) 550c6a0dd7eSSuresh Siddha return -EINVAL; 5512225a122SSuresh Siddha 5522225a122SSuresh Siddha regset_no = regset - view->regsets; 5532225a122SSuresh Siddha kiov->iov_len = min(kiov->iov_len, 5542225a122SSuresh Siddha (__kernel_size_t) (regset->n * regset->size)); 5552225a122SSuresh Siddha 5562225a122SSuresh Siddha if (req == PTRACE_GETREGSET) 5572225a122SSuresh Siddha return copy_regset_to_user(task, view, regset_no, 0, 5582225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5592225a122SSuresh Siddha else 5602225a122SSuresh Siddha return copy_regset_from_user(task, view, regset_no, 0, 5612225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5622225a122SSuresh Siddha } 5632225a122SSuresh Siddha 5642225a122SSuresh Siddha #endif 5652225a122SSuresh Siddha 5661da177e4SLinus Torvalds int ptrace_request(struct task_struct *child, long request, 5674abf9869SNamhyung Kim unsigned long addr, unsigned long data) 5681da177e4SLinus Torvalds { 5691da177e4SLinus Torvalds int ret = -EIO; 570e16b2781SRoland McGrath siginfo_t siginfo; 5719fed81dcSNamhyung Kim void __user *datavp = (void __user *) data; 5729fed81dcSNamhyung Kim unsigned long __user *datalp = datavp; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds switch (request) { 57516c3e389SRoland McGrath case PTRACE_PEEKTEXT: 57616c3e389SRoland McGrath case PTRACE_PEEKDATA: 57716c3e389SRoland McGrath return generic_ptrace_peekdata(child, addr, data); 57816c3e389SRoland McGrath case PTRACE_POKETEXT: 57916c3e389SRoland McGrath case PTRACE_POKEDATA: 58016c3e389SRoland McGrath return generic_ptrace_pokedata(child, addr, data); 58116c3e389SRoland McGrath 5821da177e4SLinus Torvalds #ifdef PTRACE_OLDSETOPTIONS 5831da177e4SLinus Torvalds case PTRACE_OLDSETOPTIONS: 5841da177e4SLinus Torvalds #endif 5851da177e4SLinus Torvalds case PTRACE_SETOPTIONS: 5861da177e4SLinus Torvalds ret = ptrace_setoptions(child, data); 5871da177e4SLinus Torvalds break; 5881da177e4SLinus Torvalds case PTRACE_GETEVENTMSG: 5899fed81dcSNamhyung Kim ret = put_user(child->ptrace_message, datalp); 5901da177e4SLinus Torvalds break; 591e16b2781SRoland McGrath 5921da177e4SLinus Torvalds case PTRACE_GETSIGINFO: 593e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 594e16b2781SRoland McGrath if (!ret) 5959fed81dcSNamhyung Kim ret = copy_siginfo_to_user(datavp, &siginfo); 5961da177e4SLinus Torvalds break; 597e16b2781SRoland McGrath 5981da177e4SLinus Torvalds case PTRACE_SETSIGINFO: 5999fed81dcSNamhyung Kim if (copy_from_user(&siginfo, datavp, sizeof siginfo)) 600e16b2781SRoland McGrath ret = -EFAULT; 601e16b2781SRoland McGrath else 602e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 6031da177e4SLinus Torvalds break; 604e16b2781SRoland McGrath 6051bcf5482SAlexey Dobriyan case PTRACE_DETACH: /* detach a process that was attached. */ 6061bcf5482SAlexey Dobriyan ret = ptrace_detach(child, data); 6071bcf5482SAlexey Dobriyan break; 60836df29d7SRoland McGrath 6099c1a1259SMike Frysinger #ifdef CONFIG_BINFMT_ELF_FDPIC 6109c1a1259SMike Frysinger case PTRACE_GETFDPIC: { 611e0129ef9SOleg Nesterov struct mm_struct *mm = get_task_mm(child); 6129c1a1259SMike Frysinger unsigned long tmp = 0; 6139c1a1259SMike Frysinger 614e0129ef9SOleg Nesterov ret = -ESRCH; 615e0129ef9SOleg Nesterov if (!mm) 616e0129ef9SOleg Nesterov break; 617e0129ef9SOleg Nesterov 6189c1a1259SMike Frysinger switch (addr) { 6199c1a1259SMike Frysinger case PTRACE_GETFDPIC_EXEC: 620e0129ef9SOleg Nesterov tmp = mm->context.exec_fdpic_loadmap; 6219c1a1259SMike Frysinger break; 6229c1a1259SMike Frysinger case PTRACE_GETFDPIC_INTERP: 623e0129ef9SOleg Nesterov tmp = mm->context.interp_fdpic_loadmap; 6249c1a1259SMike Frysinger break; 6259c1a1259SMike Frysinger default: 6269c1a1259SMike Frysinger break; 6279c1a1259SMike Frysinger } 628e0129ef9SOleg Nesterov mmput(mm); 6299c1a1259SMike Frysinger 6309fed81dcSNamhyung Kim ret = put_user(tmp, datalp); 6319c1a1259SMike Frysinger break; 6329c1a1259SMike Frysinger } 6339c1a1259SMike Frysinger #endif 6349c1a1259SMike Frysinger 63536df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 63636df29d7SRoland McGrath case PTRACE_SINGLESTEP: 63736df29d7SRoland McGrath #endif 6385b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 6395b88abbfSRoland McGrath case PTRACE_SINGLEBLOCK: 6405b88abbfSRoland McGrath #endif 64136df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 64236df29d7SRoland McGrath case PTRACE_SYSEMU: 64336df29d7SRoland McGrath case PTRACE_SYSEMU_SINGLESTEP: 64436df29d7SRoland McGrath #endif 64536df29d7SRoland McGrath case PTRACE_SYSCALL: 64636df29d7SRoland McGrath case PTRACE_CONT: 64736df29d7SRoland McGrath return ptrace_resume(child, request, data); 64836df29d7SRoland McGrath 64936df29d7SRoland McGrath case PTRACE_KILL: 65036df29d7SRoland McGrath if (child->exit_state) /* already dead */ 65136df29d7SRoland McGrath return 0; 65236df29d7SRoland McGrath return ptrace_resume(child, request, SIGKILL); 65336df29d7SRoland McGrath 6542225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 6552225a122SSuresh Siddha case PTRACE_GETREGSET: 6562225a122SSuresh Siddha case PTRACE_SETREGSET: 6572225a122SSuresh Siddha { 6582225a122SSuresh Siddha struct iovec kiov; 6599fed81dcSNamhyung Kim struct iovec __user *uiov = datavp; 6602225a122SSuresh Siddha 6612225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 6622225a122SSuresh Siddha return -EFAULT; 6632225a122SSuresh Siddha 6642225a122SSuresh Siddha if (__get_user(kiov.iov_base, &uiov->iov_base) || 6652225a122SSuresh Siddha __get_user(kiov.iov_len, &uiov->iov_len)) 6662225a122SSuresh Siddha return -EFAULT; 6672225a122SSuresh Siddha 6682225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 6692225a122SSuresh Siddha if (!ret) 6702225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 6712225a122SSuresh Siddha break; 6722225a122SSuresh Siddha } 6732225a122SSuresh Siddha #endif 6741da177e4SLinus Torvalds default: 6751da177e4SLinus Torvalds break; 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds return ret; 6791da177e4SLinus Torvalds } 680481bed45SChristoph Hellwig 6818053bdd5SOleg Nesterov static struct task_struct *ptrace_get_task_struct(pid_t pid) 6826b9c7ed8SChristoph Hellwig { 6836b9c7ed8SChristoph Hellwig struct task_struct *child; 6846b9c7ed8SChristoph Hellwig 6858053bdd5SOleg Nesterov rcu_read_lock(); 686228ebcbeSPavel Emelyanov child = find_task_by_vpid(pid); 687481bed45SChristoph Hellwig if (child) 688481bed45SChristoph Hellwig get_task_struct(child); 6898053bdd5SOleg Nesterov rcu_read_unlock(); 690f400e198SSukadev Bhattiprolu 691481bed45SChristoph Hellwig if (!child) 6926b9c7ed8SChristoph Hellwig return ERR_PTR(-ESRCH); 6936b9c7ed8SChristoph Hellwig return child; 694481bed45SChristoph Hellwig } 695481bed45SChristoph Hellwig 6960ac15559SChristoph Hellwig #ifndef arch_ptrace_attach 6970ac15559SChristoph Hellwig #define arch_ptrace_attach(child) do { } while (0) 6980ac15559SChristoph Hellwig #endif 6990ac15559SChristoph Hellwig 7004abf9869SNamhyung Kim SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, 7014abf9869SNamhyung Kim unsigned long, data) 702481bed45SChristoph Hellwig { 703481bed45SChristoph Hellwig struct task_struct *child; 704481bed45SChristoph Hellwig long ret; 705481bed45SChristoph Hellwig 7066b9c7ed8SChristoph Hellwig if (request == PTRACE_TRACEME) { 7076b9c7ed8SChristoph Hellwig ret = ptrace_traceme(); 7086ea6dd93SHaavard Skinnemoen if (!ret) 7096ea6dd93SHaavard Skinnemoen arch_ptrace_attach(current); 710481bed45SChristoph Hellwig goto out; 7116b9c7ed8SChristoph Hellwig } 7126b9c7ed8SChristoph Hellwig 7136b9c7ed8SChristoph Hellwig child = ptrace_get_task_struct(pid); 7146b9c7ed8SChristoph Hellwig if (IS_ERR(child)) { 7156b9c7ed8SChristoph Hellwig ret = PTR_ERR(child); 7166b9c7ed8SChristoph Hellwig goto out; 7176b9c7ed8SChristoph Hellwig } 718481bed45SChristoph Hellwig 719481bed45SChristoph Hellwig if (request == PTRACE_ATTACH) { 720481bed45SChristoph Hellwig ret = ptrace_attach(child); 7210ac15559SChristoph Hellwig /* 7220ac15559SChristoph Hellwig * Some architectures need to do book-keeping after 7230ac15559SChristoph Hellwig * a ptrace attach. 7240ac15559SChristoph Hellwig */ 7250ac15559SChristoph Hellwig if (!ret) 7260ac15559SChristoph Hellwig arch_ptrace_attach(child); 727005f18dfSChristoph Hellwig goto out_put_task_struct; 728481bed45SChristoph Hellwig } 729481bed45SChristoph Hellwig 730481bed45SChristoph Hellwig ret = ptrace_check_attach(child, request == PTRACE_KILL); 731481bed45SChristoph Hellwig if (ret < 0) 732481bed45SChristoph Hellwig goto out_put_task_struct; 733481bed45SChristoph Hellwig 734481bed45SChristoph Hellwig ret = arch_ptrace(child, request, addr, data); 735481bed45SChristoph Hellwig 736481bed45SChristoph Hellwig out_put_task_struct: 737481bed45SChristoph Hellwig put_task_struct(child); 738481bed45SChristoph Hellwig out: 739481bed45SChristoph Hellwig return ret; 740481bed45SChristoph Hellwig } 74176647323SAlexey Dobriyan 7424abf9869SNamhyung Kim int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, 7434abf9869SNamhyung Kim unsigned long data) 74476647323SAlexey Dobriyan { 74576647323SAlexey Dobriyan unsigned long tmp; 74676647323SAlexey Dobriyan int copied; 74776647323SAlexey Dobriyan 74876647323SAlexey Dobriyan copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); 74976647323SAlexey Dobriyan if (copied != sizeof(tmp)) 75076647323SAlexey Dobriyan return -EIO; 75176647323SAlexey Dobriyan return put_user(tmp, (unsigned long __user *)data); 75276647323SAlexey Dobriyan } 753f284ce72SAlexey Dobriyan 7544abf9869SNamhyung Kim int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, 7554abf9869SNamhyung Kim unsigned long data) 756f284ce72SAlexey Dobriyan { 757f284ce72SAlexey Dobriyan int copied; 758f284ce72SAlexey Dobriyan 759f284ce72SAlexey Dobriyan copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); 760f284ce72SAlexey Dobriyan return (copied == sizeof(data)) ? 0 : -EIO; 761f284ce72SAlexey Dobriyan } 762032d82d9SRoland McGrath 76396b8936aSChristoph Hellwig #if defined CONFIG_COMPAT 764032d82d9SRoland McGrath #include <linux/compat.h> 765032d82d9SRoland McGrath 766032d82d9SRoland McGrath int compat_ptrace_request(struct task_struct *child, compat_long_t request, 767032d82d9SRoland McGrath compat_ulong_t addr, compat_ulong_t data) 768032d82d9SRoland McGrath { 769032d82d9SRoland McGrath compat_ulong_t __user *datap = compat_ptr(data); 770032d82d9SRoland McGrath compat_ulong_t word; 771e16b2781SRoland McGrath siginfo_t siginfo; 772032d82d9SRoland McGrath int ret; 773032d82d9SRoland McGrath 774032d82d9SRoland McGrath switch (request) { 775032d82d9SRoland McGrath case PTRACE_PEEKTEXT: 776032d82d9SRoland McGrath case PTRACE_PEEKDATA: 777032d82d9SRoland McGrath ret = access_process_vm(child, addr, &word, sizeof(word), 0); 778032d82d9SRoland McGrath if (ret != sizeof(word)) 779032d82d9SRoland McGrath ret = -EIO; 780032d82d9SRoland McGrath else 781032d82d9SRoland McGrath ret = put_user(word, datap); 782032d82d9SRoland McGrath break; 783032d82d9SRoland McGrath 784032d82d9SRoland McGrath case PTRACE_POKETEXT: 785032d82d9SRoland McGrath case PTRACE_POKEDATA: 786032d82d9SRoland McGrath ret = access_process_vm(child, addr, &data, sizeof(data), 1); 787032d82d9SRoland McGrath ret = (ret != sizeof(data) ? -EIO : 0); 788032d82d9SRoland McGrath break; 789032d82d9SRoland McGrath 790032d82d9SRoland McGrath case PTRACE_GETEVENTMSG: 791032d82d9SRoland McGrath ret = put_user((compat_ulong_t) child->ptrace_message, datap); 792032d82d9SRoland McGrath break; 793032d82d9SRoland McGrath 794e16b2781SRoland McGrath case PTRACE_GETSIGINFO: 795e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 796e16b2781SRoland McGrath if (!ret) 797e16b2781SRoland McGrath ret = copy_siginfo_to_user32( 798e16b2781SRoland McGrath (struct compat_siginfo __user *) datap, 799e16b2781SRoland McGrath &siginfo); 800e16b2781SRoland McGrath break; 801e16b2781SRoland McGrath 802e16b2781SRoland McGrath case PTRACE_SETSIGINFO: 803e16b2781SRoland McGrath memset(&siginfo, 0, sizeof siginfo); 804e16b2781SRoland McGrath if (copy_siginfo_from_user32( 805e16b2781SRoland McGrath &siginfo, (struct compat_siginfo __user *) datap)) 806e16b2781SRoland McGrath ret = -EFAULT; 807e16b2781SRoland McGrath else 808e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 809e16b2781SRoland McGrath break; 8102225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 8112225a122SSuresh Siddha case PTRACE_GETREGSET: 8122225a122SSuresh Siddha case PTRACE_SETREGSET: 8132225a122SSuresh Siddha { 8142225a122SSuresh Siddha struct iovec kiov; 8152225a122SSuresh Siddha struct compat_iovec __user *uiov = 8162225a122SSuresh Siddha (struct compat_iovec __user *) datap; 8172225a122SSuresh Siddha compat_uptr_t ptr; 8182225a122SSuresh Siddha compat_size_t len; 8192225a122SSuresh Siddha 8202225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 8212225a122SSuresh Siddha return -EFAULT; 8222225a122SSuresh Siddha 8232225a122SSuresh Siddha if (__get_user(ptr, &uiov->iov_base) || 8242225a122SSuresh Siddha __get_user(len, &uiov->iov_len)) 8252225a122SSuresh Siddha return -EFAULT; 8262225a122SSuresh Siddha 8272225a122SSuresh Siddha kiov.iov_base = compat_ptr(ptr); 8282225a122SSuresh Siddha kiov.iov_len = len; 8292225a122SSuresh Siddha 8302225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 8312225a122SSuresh Siddha if (!ret) 8322225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 8332225a122SSuresh Siddha break; 8342225a122SSuresh Siddha } 8352225a122SSuresh Siddha #endif 836e16b2781SRoland McGrath 837032d82d9SRoland McGrath default: 838032d82d9SRoland McGrath ret = ptrace_request(child, request, addr, data); 839032d82d9SRoland McGrath } 840032d82d9SRoland McGrath 841032d82d9SRoland McGrath return ret; 842032d82d9SRoland McGrath } 843c269f196SRoland McGrath 844c269f196SRoland McGrath asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, 845c269f196SRoland McGrath compat_long_t addr, compat_long_t data) 846c269f196SRoland McGrath { 847c269f196SRoland McGrath struct task_struct *child; 848c269f196SRoland McGrath long ret; 849c269f196SRoland McGrath 850c269f196SRoland McGrath if (request == PTRACE_TRACEME) { 851c269f196SRoland McGrath ret = ptrace_traceme(); 852c269f196SRoland McGrath goto out; 853c269f196SRoland McGrath } 854c269f196SRoland McGrath 855c269f196SRoland McGrath child = ptrace_get_task_struct(pid); 856c269f196SRoland McGrath if (IS_ERR(child)) { 857c269f196SRoland McGrath ret = PTR_ERR(child); 858c269f196SRoland McGrath goto out; 859c269f196SRoland McGrath } 860c269f196SRoland McGrath 861c269f196SRoland McGrath if (request == PTRACE_ATTACH) { 862c269f196SRoland McGrath ret = ptrace_attach(child); 863c269f196SRoland McGrath /* 864c269f196SRoland McGrath * Some architectures need to do book-keeping after 865c269f196SRoland McGrath * a ptrace attach. 866c269f196SRoland McGrath */ 867c269f196SRoland McGrath if (!ret) 868c269f196SRoland McGrath arch_ptrace_attach(child); 869c269f196SRoland McGrath goto out_put_task_struct; 870c269f196SRoland McGrath } 871c269f196SRoland McGrath 872c269f196SRoland McGrath ret = ptrace_check_attach(child, request == PTRACE_KILL); 873c269f196SRoland McGrath if (!ret) 874c269f196SRoland McGrath ret = compat_arch_ptrace(child, request, addr, data); 875c269f196SRoland McGrath 876c269f196SRoland McGrath out_put_task_struct: 877c269f196SRoland McGrath put_task_struct(child); 878c269f196SRoland McGrath out: 879c269f196SRoland McGrath return ret; 880c269f196SRoland McGrath } 88196b8936aSChristoph Hellwig #endif /* CONFIG_COMPAT */ 882