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); 137c69e8d9cSDavid Howells if ((cred->uid != tcred->euid || 138c69e8d9cSDavid Howells cred->uid != tcred->suid || 139c69e8d9cSDavid Howells cred->uid != tcred->uid || 140c69e8d9cSDavid Howells cred->gid != tcred->egid || 141c69e8d9cSDavid Howells cred->gid != tcred->sgid || 142c69e8d9cSDavid Howells cred->gid != tcred->gid) && 143c69e8d9cSDavid Howells !capable(CAP_SYS_PTRACE)) { 144c69e8d9cSDavid Howells rcu_read_unlock(); 145ab8d11beSMiklos Szeredi return -EPERM; 146c69e8d9cSDavid Howells } 147c69e8d9cSDavid Howells rcu_read_unlock(); 148ab8d11beSMiklos Szeredi smp_rmb(); 149df26c40eSEric W. Biederman if (task->mm) 1506c5d5238SKawai, Hidehiro dumpable = get_dumpable(task->mm); 151df26c40eSEric W. Biederman if (!dumpable && !capable(CAP_SYS_PTRACE)) 152ab8d11beSMiklos Szeredi return -EPERM; 153ab8d11beSMiklos Szeredi 1549e48858fSIngo Molnar return security_ptrace_access_check(task, mode); 155ab8d11beSMiklos Szeredi } 156ab8d11beSMiklos Szeredi 157006ebb40SStephen Smalley bool ptrace_may_access(struct task_struct *task, unsigned int mode) 158ab8d11beSMiklos Szeredi { 159ab8d11beSMiklos Szeredi int err; 160ab8d11beSMiklos Szeredi task_lock(task); 161006ebb40SStephen Smalley err = __ptrace_may_access(task, mode); 162ab8d11beSMiklos Szeredi task_unlock(task); 1633a709703SRoland McGrath return !err; 164ab8d11beSMiklos Szeredi } 165ab8d11beSMiklos Szeredi 1661da177e4SLinus Torvalds int ptrace_attach(struct task_struct *task) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds int retval; 169f5b40e36SLinus Torvalds 170a5cb013dSAl Viro audit_ptrace(task); 171a5cb013dSAl Viro 1721da177e4SLinus Torvalds retval = -EPERM; 173b79b7ba9SOleg Nesterov if (unlikely(task->flags & PF_KTHREAD)) 174b79b7ba9SOleg Nesterov goto out; 175bac0abd6SPavel Emelyanov if (same_thread_group(task, current)) 176f5b40e36SLinus Torvalds goto out; 177f5b40e36SLinus Torvalds 178f2f0b00aSOleg Nesterov /* 179f2f0b00aSOleg Nesterov * Protect exec's credential calculations against our interference; 1805e751e99SDavid Howells * interference; SUID, SGID and LSM creds get determined differently 1815e751e99SDavid Howells * under ptrace. 182d84f4f99SDavid Howells */ 183793285fcSOleg Nesterov retval = -ERESTARTNOINTR; 184793285fcSOleg Nesterov if (mutex_lock_interruptible(&task->cred_guard_mutex)) 185d84f4f99SDavid Howells goto out; 1864b105cbbSOleg Nesterov 187f5b40e36SLinus Torvalds task_lock(task); 188006ebb40SStephen Smalley retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); 1894b105cbbSOleg Nesterov task_unlock(task); 1901da177e4SLinus Torvalds if (retval) 1914b105cbbSOleg Nesterov goto unlock_creds; 1921da177e4SLinus Torvalds 1934b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 194b79b7ba9SOleg Nesterov retval = -EPERM; 195b79b7ba9SOleg Nesterov if (unlikely(task->exit_state)) 1964b105cbbSOleg Nesterov goto unlock_tasklist; 197f2f0b00aSOleg Nesterov if (task->ptrace) 1984b105cbbSOleg Nesterov goto unlock_tasklist; 199b79b7ba9SOleg Nesterov 200f2f0b00aSOleg Nesterov task->ptrace = PT_PTRACED; 2011da177e4SLinus Torvalds if (capable(CAP_SYS_PTRACE)) 2021da177e4SLinus Torvalds task->ptrace |= PT_PTRACE_CAP; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds __ptrace_link(task, current); 20533e9fc7dSOleg Nesterov send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); 206b79b7ba9SOleg Nesterov 207b79b7ba9SOleg Nesterov retval = 0; 2084b105cbbSOleg Nesterov unlock_tasklist: 2094b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2104b105cbbSOleg Nesterov unlock_creds: 2115e751e99SDavid Howells mutex_unlock(&task->cred_guard_mutex); 212f5b40e36SLinus Torvalds out: 2131da177e4SLinus Torvalds return retval; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 216f2f0b00aSOleg Nesterov /** 217f2f0b00aSOleg Nesterov * ptrace_traceme -- helper for PTRACE_TRACEME 218f2f0b00aSOleg Nesterov * 219f2f0b00aSOleg Nesterov * Performs checks and sets PT_PTRACED. 220f2f0b00aSOleg Nesterov * Should be used by all ptrace implementations for PTRACE_TRACEME. 221f2f0b00aSOleg Nesterov */ 222f2f0b00aSOleg Nesterov int ptrace_traceme(void) 223f2f0b00aSOleg Nesterov { 224f2f0b00aSOleg Nesterov int ret = -EPERM; 225f2f0b00aSOleg Nesterov 2264b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 2274b105cbbSOleg Nesterov /* Are we already being traced? */ 228f2f0b00aSOleg Nesterov if (!current->ptrace) { 229f2f0b00aSOleg Nesterov ret = security_ptrace_traceme(current->parent); 230f2f0b00aSOleg Nesterov /* 231f2f0b00aSOleg Nesterov * Check PF_EXITING to ensure ->real_parent has not passed 232f2f0b00aSOleg Nesterov * exit_ptrace(). Otherwise we don't report the error but 233f2f0b00aSOleg Nesterov * pretend ->real_parent untraces us right after return. 234f2f0b00aSOleg Nesterov */ 235f2f0b00aSOleg Nesterov if (!ret && !(current->real_parent->flags & PF_EXITING)) { 236f2f0b00aSOleg Nesterov current->ptrace = PT_PTRACED; 237f2f0b00aSOleg Nesterov __ptrace_link(current, current->real_parent); 238f2f0b00aSOleg Nesterov } 239f2f0b00aSOleg Nesterov } 2404b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2414b105cbbSOleg Nesterov 242f2f0b00aSOleg Nesterov return ret; 243f2f0b00aSOleg Nesterov } 244f2f0b00aSOleg Nesterov 24539c626aeSOleg Nesterov /* 24639c626aeSOleg Nesterov * Called with irqs disabled, returns true if childs should reap themselves. 24739c626aeSOleg Nesterov */ 24839c626aeSOleg Nesterov static int ignoring_children(struct sighand_struct *sigh) 24939c626aeSOleg Nesterov { 25039c626aeSOleg Nesterov int ret; 25139c626aeSOleg Nesterov spin_lock(&sigh->siglock); 25239c626aeSOleg Nesterov ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || 25339c626aeSOleg Nesterov (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); 25439c626aeSOleg Nesterov spin_unlock(&sigh->siglock); 25539c626aeSOleg Nesterov return ret; 25639c626aeSOleg Nesterov } 25739c626aeSOleg Nesterov 25839c626aeSOleg Nesterov /* 25939c626aeSOleg Nesterov * Called with tasklist_lock held for writing. 26039c626aeSOleg Nesterov * Unlink a traced task, and clean it up if it was a traced zombie. 26139c626aeSOleg Nesterov * Return true if it needs to be reaped with release_task(). 26239c626aeSOleg Nesterov * (We can't call release_task() here because we already hold tasklist_lock.) 26339c626aeSOleg Nesterov * 26439c626aeSOleg Nesterov * If it's a zombie, our attachedness prevented normal parent notification 26539c626aeSOleg Nesterov * or self-reaping. Do notification now if it would have happened earlier. 26639c626aeSOleg Nesterov * If it should reap itself, return true. 26739c626aeSOleg Nesterov * 268a7f0765eSOleg Nesterov * If it's our own child, there is no notification to do. But if our normal 269a7f0765eSOleg Nesterov * children self-reap, then this child was prevented by ptrace and we must 270a7f0765eSOleg Nesterov * reap it now, in that case we must also wake up sub-threads sleeping in 271a7f0765eSOleg Nesterov * do_wait(). 27239c626aeSOleg Nesterov */ 27339c626aeSOleg Nesterov static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) 27439c626aeSOleg Nesterov { 27539c626aeSOleg Nesterov __ptrace_unlink(p); 27639c626aeSOleg Nesterov 27739c626aeSOleg Nesterov if (p->exit_state == EXIT_ZOMBIE) { 27839c626aeSOleg Nesterov if (!task_detached(p) && thread_group_empty(p)) { 27939c626aeSOleg Nesterov if (!same_thread_group(p->real_parent, tracer)) 28039c626aeSOleg Nesterov do_notify_parent(p, p->exit_signal); 281a7f0765eSOleg Nesterov else if (ignoring_children(tracer->sighand)) { 282a7f0765eSOleg Nesterov __wake_up_parent(p, tracer); 28339c626aeSOleg Nesterov p->exit_signal = -1; 28439c626aeSOleg Nesterov } 285a7f0765eSOleg Nesterov } 28639c626aeSOleg Nesterov if (task_detached(p)) { 28739c626aeSOleg Nesterov /* Mark it as in the process of being reaped. */ 28839c626aeSOleg Nesterov p->exit_state = EXIT_DEAD; 28939c626aeSOleg Nesterov return true; 29039c626aeSOleg Nesterov } 29139c626aeSOleg Nesterov } 29239c626aeSOleg Nesterov 29339c626aeSOleg Nesterov return false; 29439c626aeSOleg Nesterov } 29539c626aeSOleg Nesterov 2961da177e4SLinus Torvalds int ptrace_detach(struct task_struct *child, unsigned int data) 2971da177e4SLinus Torvalds { 29839c626aeSOleg Nesterov bool dead = false; 2994576145cSOleg Nesterov 3007ed20e1aSJesper Juhl if (!valid_signal(data)) 3011da177e4SLinus Torvalds return -EIO; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* Architecture-specific hardware disable .. */ 3041da177e4SLinus Torvalds ptrace_disable(child); 3057d941432SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 3061da177e4SLinus Torvalds 30795c3eb76SOleg Nesterov write_lock_irq(&tasklist_lock); 30839c626aeSOleg Nesterov /* 30939c626aeSOleg Nesterov * This child can be already killed. Make sure de_thread() or 31039c626aeSOleg Nesterov * our sub-thread doing do_wait() didn't do release_task() yet. 31139c626aeSOleg Nesterov */ 31295c3eb76SOleg Nesterov if (child->ptrace) { 31395c3eb76SOleg Nesterov child->exit_code = data; 3144576145cSOleg Nesterov dead = __ptrace_detach(current, child); 315edaba2c5SOleg Nesterov if (!child->exit_state) 316edaba2c5SOleg Nesterov wake_up_process(child); 31795c3eb76SOleg Nesterov } 3181da177e4SLinus Torvalds write_unlock_irq(&tasklist_lock); 3191da177e4SLinus Torvalds 3204576145cSOleg Nesterov if (unlikely(dead)) 3214576145cSOleg Nesterov release_task(child); 3224576145cSOleg Nesterov 3231da177e4SLinus Torvalds return 0; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 32639c626aeSOleg Nesterov /* 32739c626aeSOleg Nesterov * Detach all tasks we were using ptrace on. 32839c626aeSOleg Nesterov */ 32939c626aeSOleg Nesterov void exit_ptrace(struct task_struct *tracer) 33039c626aeSOleg Nesterov { 33139c626aeSOleg Nesterov struct task_struct *p, *n; 33239c626aeSOleg Nesterov LIST_HEAD(ptrace_dead); 33339c626aeSOleg Nesterov 33439c626aeSOleg Nesterov write_lock_irq(&tasklist_lock); 33539c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { 33639c626aeSOleg Nesterov if (__ptrace_detach(tracer, p)) 33739c626aeSOleg Nesterov list_add(&p->ptrace_entry, &ptrace_dead); 33839c626aeSOleg Nesterov } 33939c626aeSOleg Nesterov write_unlock_irq(&tasklist_lock); 34039c626aeSOleg Nesterov 34139c626aeSOleg Nesterov BUG_ON(!list_empty(&tracer->ptraced)); 34239c626aeSOleg Nesterov 34339c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) { 34439c626aeSOleg Nesterov list_del_init(&p->ptrace_entry); 34539c626aeSOleg Nesterov release_task(p); 34639c626aeSOleg Nesterov } 34739c626aeSOleg Nesterov } 34839c626aeSOleg Nesterov 3491da177e4SLinus Torvalds int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) 3501da177e4SLinus Torvalds { 3511da177e4SLinus Torvalds int copied = 0; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds while (len > 0) { 3541da177e4SLinus Torvalds char buf[128]; 3551da177e4SLinus Torvalds int this_len, retval; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 3581da177e4SLinus Torvalds retval = access_process_vm(tsk, src, buf, this_len, 0); 3591da177e4SLinus Torvalds if (!retval) { 3601da177e4SLinus Torvalds if (copied) 3611da177e4SLinus Torvalds break; 3621da177e4SLinus Torvalds return -EIO; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds if (copy_to_user(dst, buf, retval)) 3651da177e4SLinus Torvalds return -EFAULT; 3661da177e4SLinus Torvalds copied += retval; 3671da177e4SLinus Torvalds src += retval; 3681da177e4SLinus Torvalds dst += retval; 3691da177e4SLinus Torvalds len -= retval; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds return copied; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) 3751da177e4SLinus Torvalds { 3761da177e4SLinus Torvalds int copied = 0; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds while (len > 0) { 3791da177e4SLinus Torvalds char buf[128]; 3801da177e4SLinus Torvalds int this_len, retval; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 3831da177e4SLinus Torvalds if (copy_from_user(buf, src, this_len)) 3841da177e4SLinus Torvalds return -EFAULT; 3851da177e4SLinus Torvalds retval = access_process_vm(tsk, dst, buf, this_len, 1); 3861da177e4SLinus Torvalds if (!retval) { 3871da177e4SLinus Torvalds if (copied) 3881da177e4SLinus Torvalds break; 3891da177e4SLinus Torvalds return -EIO; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds copied += retval; 3921da177e4SLinus Torvalds src += retval; 3931da177e4SLinus Torvalds dst += retval; 3941da177e4SLinus Torvalds len -= retval; 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds return copied; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds static int ptrace_setoptions(struct task_struct *child, long data) 4001da177e4SLinus Torvalds { 4011da177e4SLinus Torvalds child->ptrace &= ~PT_TRACE_MASK; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds if (data & PTRACE_O_TRACESYSGOOD) 4041da177e4SLinus Torvalds child->ptrace |= PT_TRACESYSGOOD; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds if (data & PTRACE_O_TRACEFORK) 4071da177e4SLinus Torvalds child->ptrace |= PT_TRACE_FORK; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORK) 4101da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds if (data & PTRACE_O_TRACECLONE) 4131da177e4SLinus Torvalds child->ptrace |= PT_TRACE_CLONE; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXEC) 4161da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXEC; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORKDONE) 4191da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK_DONE; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXIT) 4221da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXIT; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds return (data & ~PTRACE_O_MASK) ? -EINVAL : 0; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 427e16b2781SRoland McGrath static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) 4281da177e4SLinus Torvalds { 429e4961254SOleg Nesterov unsigned long flags; 4301da177e4SLinus Torvalds int error = -ESRCH; 4311da177e4SLinus Torvalds 432e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4331da177e4SLinus Torvalds error = -EINVAL; 4341da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 435e16b2781SRoland McGrath *info = *child->last_siginfo; 4361da177e4SLinus Torvalds error = 0; 4371da177e4SLinus Torvalds } 438e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds return error; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 443e16b2781SRoland McGrath static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) 4441da177e4SLinus Torvalds { 445e4961254SOleg Nesterov unsigned long flags; 4461da177e4SLinus Torvalds int error = -ESRCH; 4471da177e4SLinus Torvalds 448e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4491da177e4SLinus Torvalds error = -EINVAL; 4501da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 451e16b2781SRoland McGrath *child->last_siginfo = *info; 4521da177e4SLinus Torvalds error = 0; 4531da177e4SLinus Torvalds } 454e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds return error; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 45936df29d7SRoland McGrath 46036df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 46136df29d7SRoland McGrath #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) 46236df29d7SRoland McGrath #else 46336df29d7SRoland McGrath #define is_singlestep(request) 0 46436df29d7SRoland McGrath #endif 46536df29d7SRoland McGrath 4665b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 4675b88abbfSRoland McGrath #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) 4685b88abbfSRoland McGrath #else 4695b88abbfSRoland McGrath #define is_singleblock(request) 0 4705b88abbfSRoland McGrath #endif 4715b88abbfSRoland McGrath 47236df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 47336df29d7SRoland McGrath #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) 47436df29d7SRoland McGrath #else 47536df29d7SRoland McGrath #define is_sysemu_singlestep(request) 0 47636df29d7SRoland McGrath #endif 47736df29d7SRoland McGrath 47836df29d7SRoland McGrath static int ptrace_resume(struct task_struct *child, long request, long data) 47936df29d7SRoland McGrath { 48036df29d7SRoland McGrath if (!valid_signal(data)) 48136df29d7SRoland McGrath return -EIO; 48236df29d7SRoland McGrath 48336df29d7SRoland McGrath if (request == PTRACE_SYSCALL) 48436df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 48536df29d7SRoland McGrath else 48636df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 48736df29d7SRoland McGrath 48836df29d7SRoland McGrath #ifdef TIF_SYSCALL_EMU 48936df29d7SRoland McGrath if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) 49036df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 49136df29d7SRoland McGrath else 49236df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 49336df29d7SRoland McGrath #endif 49436df29d7SRoland McGrath 4955b88abbfSRoland McGrath if (is_singleblock(request)) { 4965b88abbfSRoland McGrath if (unlikely(!arch_has_block_step())) 4975b88abbfSRoland McGrath return -EIO; 4985b88abbfSRoland McGrath user_enable_block_step(child); 4995b88abbfSRoland McGrath } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { 50036df29d7SRoland McGrath if (unlikely(!arch_has_single_step())) 50136df29d7SRoland McGrath return -EIO; 50236df29d7SRoland McGrath user_enable_single_step(child); 5033a709703SRoland McGrath } else { 50436df29d7SRoland McGrath user_disable_single_step(child); 5053a709703SRoland McGrath } 50636df29d7SRoland McGrath 50736df29d7SRoland McGrath child->exit_code = data; 50836df29d7SRoland McGrath wake_up_process(child); 50936df29d7SRoland McGrath 51036df29d7SRoland McGrath return 0; 51136df29d7SRoland McGrath } 51236df29d7SRoland McGrath 5132225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 5142225a122SSuresh Siddha 5152225a122SSuresh Siddha static const struct user_regset * 5162225a122SSuresh Siddha find_regset(const struct user_regset_view *view, unsigned int type) 5172225a122SSuresh Siddha { 5182225a122SSuresh Siddha const struct user_regset *regset; 5192225a122SSuresh Siddha int n; 5202225a122SSuresh Siddha 5212225a122SSuresh Siddha for (n = 0; n < view->n; ++n) { 5222225a122SSuresh Siddha regset = view->regsets + n; 5232225a122SSuresh Siddha if (regset->core_note_type == type) 5242225a122SSuresh Siddha return regset; 5252225a122SSuresh Siddha } 5262225a122SSuresh Siddha 5272225a122SSuresh Siddha return NULL; 5282225a122SSuresh Siddha } 5292225a122SSuresh Siddha 5302225a122SSuresh Siddha static int ptrace_regset(struct task_struct *task, int req, unsigned int type, 5312225a122SSuresh Siddha struct iovec *kiov) 5322225a122SSuresh Siddha { 5332225a122SSuresh Siddha const struct user_regset_view *view = task_user_regset_view(task); 5342225a122SSuresh Siddha const struct user_regset *regset = find_regset(view, type); 5352225a122SSuresh Siddha int regset_no; 5362225a122SSuresh Siddha 5372225a122SSuresh Siddha if (!regset || (kiov->iov_len % regset->size) != 0) 538c6a0dd7eSSuresh Siddha return -EINVAL; 5392225a122SSuresh Siddha 5402225a122SSuresh Siddha regset_no = regset - view->regsets; 5412225a122SSuresh Siddha kiov->iov_len = min(kiov->iov_len, 5422225a122SSuresh Siddha (__kernel_size_t) (regset->n * regset->size)); 5432225a122SSuresh Siddha 5442225a122SSuresh Siddha if (req == PTRACE_GETREGSET) 5452225a122SSuresh Siddha return copy_regset_to_user(task, view, regset_no, 0, 5462225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5472225a122SSuresh Siddha else 5482225a122SSuresh Siddha return copy_regset_from_user(task, view, regset_no, 0, 5492225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5502225a122SSuresh Siddha } 5512225a122SSuresh Siddha 5522225a122SSuresh Siddha #endif 5532225a122SSuresh Siddha 5541da177e4SLinus Torvalds int ptrace_request(struct task_struct *child, long request, 5551da177e4SLinus Torvalds long addr, long data) 5561da177e4SLinus Torvalds { 5571da177e4SLinus Torvalds int ret = -EIO; 558e16b2781SRoland McGrath siginfo_t siginfo; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds switch (request) { 56116c3e389SRoland McGrath case PTRACE_PEEKTEXT: 56216c3e389SRoland McGrath case PTRACE_PEEKDATA: 56316c3e389SRoland McGrath return generic_ptrace_peekdata(child, addr, data); 56416c3e389SRoland McGrath case PTRACE_POKETEXT: 56516c3e389SRoland McGrath case PTRACE_POKEDATA: 56616c3e389SRoland McGrath return generic_ptrace_pokedata(child, addr, data); 56716c3e389SRoland McGrath 5681da177e4SLinus Torvalds #ifdef PTRACE_OLDSETOPTIONS 5691da177e4SLinus Torvalds case PTRACE_OLDSETOPTIONS: 5701da177e4SLinus Torvalds #endif 5711da177e4SLinus Torvalds case PTRACE_SETOPTIONS: 5721da177e4SLinus Torvalds ret = ptrace_setoptions(child, data); 5731da177e4SLinus Torvalds break; 5741da177e4SLinus Torvalds case PTRACE_GETEVENTMSG: 5751da177e4SLinus Torvalds ret = put_user(child->ptrace_message, (unsigned long __user *) data); 5761da177e4SLinus Torvalds break; 577e16b2781SRoland McGrath 5781da177e4SLinus Torvalds case PTRACE_GETSIGINFO: 579e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 580e16b2781SRoland McGrath if (!ret) 581e16b2781SRoland McGrath ret = copy_siginfo_to_user((siginfo_t __user *) data, 582e16b2781SRoland McGrath &siginfo); 5831da177e4SLinus Torvalds break; 584e16b2781SRoland McGrath 5851da177e4SLinus Torvalds case PTRACE_SETSIGINFO: 586e16b2781SRoland McGrath if (copy_from_user(&siginfo, (siginfo_t __user *) data, 587e16b2781SRoland McGrath sizeof siginfo)) 588e16b2781SRoland McGrath ret = -EFAULT; 589e16b2781SRoland McGrath else 590e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 5911da177e4SLinus Torvalds break; 592e16b2781SRoland McGrath 5931bcf5482SAlexey Dobriyan case PTRACE_DETACH: /* detach a process that was attached. */ 5941bcf5482SAlexey Dobriyan ret = ptrace_detach(child, data); 5951bcf5482SAlexey Dobriyan break; 59636df29d7SRoland McGrath 5979c1a1259SMike Frysinger #ifdef CONFIG_BINFMT_ELF_FDPIC 5989c1a1259SMike Frysinger case PTRACE_GETFDPIC: { 5999c1a1259SMike Frysinger unsigned long tmp = 0; 6009c1a1259SMike Frysinger 6019c1a1259SMike Frysinger switch (addr) { 6029c1a1259SMike Frysinger case PTRACE_GETFDPIC_EXEC: 6039c1a1259SMike Frysinger tmp = child->mm->context.exec_fdpic_loadmap; 6049c1a1259SMike Frysinger break; 6059c1a1259SMike Frysinger case PTRACE_GETFDPIC_INTERP: 6069c1a1259SMike Frysinger tmp = child->mm->context.interp_fdpic_loadmap; 6079c1a1259SMike Frysinger break; 6089c1a1259SMike Frysinger default: 6099c1a1259SMike Frysinger break; 6109c1a1259SMike Frysinger } 6119c1a1259SMike Frysinger 6129c1a1259SMike Frysinger ret = put_user(tmp, (unsigned long __user *) data); 6139c1a1259SMike Frysinger break; 6149c1a1259SMike Frysinger } 6159c1a1259SMike Frysinger #endif 6169c1a1259SMike Frysinger 61736df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 61836df29d7SRoland McGrath case PTRACE_SINGLESTEP: 61936df29d7SRoland McGrath #endif 6205b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 6215b88abbfSRoland McGrath case PTRACE_SINGLEBLOCK: 6225b88abbfSRoland McGrath #endif 62336df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 62436df29d7SRoland McGrath case PTRACE_SYSEMU: 62536df29d7SRoland McGrath case PTRACE_SYSEMU_SINGLESTEP: 62636df29d7SRoland McGrath #endif 62736df29d7SRoland McGrath case PTRACE_SYSCALL: 62836df29d7SRoland McGrath case PTRACE_CONT: 62936df29d7SRoland McGrath return ptrace_resume(child, request, data); 63036df29d7SRoland McGrath 63136df29d7SRoland McGrath case PTRACE_KILL: 63236df29d7SRoland McGrath if (child->exit_state) /* already dead */ 63336df29d7SRoland McGrath return 0; 63436df29d7SRoland McGrath return ptrace_resume(child, request, SIGKILL); 63536df29d7SRoland McGrath 6362225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 6372225a122SSuresh Siddha case PTRACE_GETREGSET: 6382225a122SSuresh Siddha case PTRACE_SETREGSET: 6392225a122SSuresh Siddha { 6402225a122SSuresh Siddha struct iovec kiov; 6412225a122SSuresh Siddha struct iovec __user *uiov = (struct iovec __user *) data; 6422225a122SSuresh Siddha 6432225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 6442225a122SSuresh Siddha return -EFAULT; 6452225a122SSuresh Siddha 6462225a122SSuresh Siddha if (__get_user(kiov.iov_base, &uiov->iov_base) || 6472225a122SSuresh Siddha __get_user(kiov.iov_len, &uiov->iov_len)) 6482225a122SSuresh Siddha return -EFAULT; 6492225a122SSuresh Siddha 6502225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 6512225a122SSuresh Siddha if (!ret) 6522225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 6532225a122SSuresh Siddha break; 6542225a122SSuresh Siddha } 6552225a122SSuresh Siddha #endif 6561da177e4SLinus Torvalds default: 6571da177e4SLinus Torvalds break; 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds return ret; 6611da177e4SLinus Torvalds } 662481bed45SChristoph Hellwig 6638053bdd5SOleg Nesterov static struct task_struct *ptrace_get_task_struct(pid_t pid) 6646b9c7ed8SChristoph Hellwig { 6656b9c7ed8SChristoph Hellwig struct task_struct *child; 6666b9c7ed8SChristoph Hellwig 6678053bdd5SOleg Nesterov rcu_read_lock(); 668228ebcbeSPavel Emelyanov child = find_task_by_vpid(pid); 669481bed45SChristoph Hellwig if (child) 670481bed45SChristoph Hellwig get_task_struct(child); 6718053bdd5SOleg Nesterov rcu_read_unlock(); 672f400e198SSukadev Bhattiprolu 673481bed45SChristoph Hellwig if (!child) 6746b9c7ed8SChristoph Hellwig return ERR_PTR(-ESRCH); 6756b9c7ed8SChristoph Hellwig return child; 676481bed45SChristoph Hellwig } 677481bed45SChristoph Hellwig 6780ac15559SChristoph Hellwig #ifndef arch_ptrace_attach 6790ac15559SChristoph Hellwig #define arch_ptrace_attach(child) do { } while (0) 6800ac15559SChristoph Hellwig #endif 6810ac15559SChristoph Hellwig 6821e7bfb21SHeiko Carstens SYSCALL_DEFINE4(ptrace, long, request, long, pid, long, addr, long, data) 683481bed45SChristoph Hellwig { 684481bed45SChristoph Hellwig struct task_struct *child; 685481bed45SChristoph Hellwig long ret; 686481bed45SChristoph Hellwig 6876b9c7ed8SChristoph Hellwig if (request == PTRACE_TRACEME) { 6886b9c7ed8SChristoph Hellwig ret = ptrace_traceme(); 6896ea6dd93SHaavard Skinnemoen if (!ret) 6906ea6dd93SHaavard Skinnemoen arch_ptrace_attach(current); 691481bed45SChristoph Hellwig goto out; 6926b9c7ed8SChristoph Hellwig } 6936b9c7ed8SChristoph Hellwig 6946b9c7ed8SChristoph Hellwig child = ptrace_get_task_struct(pid); 6956b9c7ed8SChristoph Hellwig if (IS_ERR(child)) { 6966b9c7ed8SChristoph Hellwig ret = PTR_ERR(child); 6976b9c7ed8SChristoph Hellwig goto out; 6986b9c7ed8SChristoph Hellwig } 699481bed45SChristoph Hellwig 700481bed45SChristoph Hellwig if (request == PTRACE_ATTACH) { 701481bed45SChristoph Hellwig ret = ptrace_attach(child); 7020ac15559SChristoph Hellwig /* 7030ac15559SChristoph Hellwig * Some architectures need to do book-keeping after 7040ac15559SChristoph Hellwig * a ptrace attach. 7050ac15559SChristoph Hellwig */ 7060ac15559SChristoph Hellwig if (!ret) 7070ac15559SChristoph Hellwig arch_ptrace_attach(child); 708005f18dfSChristoph Hellwig goto out_put_task_struct; 709481bed45SChristoph Hellwig } 710481bed45SChristoph Hellwig 711481bed45SChristoph Hellwig ret = ptrace_check_attach(child, request == PTRACE_KILL); 712481bed45SChristoph Hellwig if (ret < 0) 713481bed45SChristoph Hellwig goto out_put_task_struct; 714481bed45SChristoph Hellwig 715481bed45SChristoph Hellwig ret = arch_ptrace(child, request, addr, data); 716481bed45SChristoph Hellwig 717481bed45SChristoph Hellwig out_put_task_struct: 718481bed45SChristoph Hellwig put_task_struct(child); 719481bed45SChristoph Hellwig out: 720481bed45SChristoph Hellwig return ret; 721481bed45SChristoph Hellwig } 72276647323SAlexey Dobriyan 72376647323SAlexey Dobriyan int generic_ptrace_peekdata(struct task_struct *tsk, long addr, long data) 72476647323SAlexey Dobriyan { 72576647323SAlexey Dobriyan unsigned long tmp; 72676647323SAlexey Dobriyan int copied; 72776647323SAlexey Dobriyan 72876647323SAlexey Dobriyan copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); 72976647323SAlexey Dobriyan if (copied != sizeof(tmp)) 73076647323SAlexey Dobriyan return -EIO; 73176647323SAlexey Dobriyan return put_user(tmp, (unsigned long __user *)data); 73276647323SAlexey Dobriyan } 733f284ce72SAlexey Dobriyan 734f284ce72SAlexey Dobriyan int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data) 735f284ce72SAlexey Dobriyan { 736f284ce72SAlexey Dobriyan int copied; 737f284ce72SAlexey Dobriyan 738f284ce72SAlexey Dobriyan copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); 739f284ce72SAlexey Dobriyan return (copied == sizeof(data)) ? 0 : -EIO; 740f284ce72SAlexey Dobriyan } 741032d82d9SRoland McGrath 74296b8936aSChristoph Hellwig #if defined CONFIG_COMPAT 743032d82d9SRoland McGrath #include <linux/compat.h> 744032d82d9SRoland McGrath 745032d82d9SRoland McGrath int compat_ptrace_request(struct task_struct *child, compat_long_t request, 746032d82d9SRoland McGrath compat_ulong_t addr, compat_ulong_t data) 747032d82d9SRoland McGrath { 748032d82d9SRoland McGrath compat_ulong_t __user *datap = compat_ptr(data); 749032d82d9SRoland McGrath compat_ulong_t word; 750e16b2781SRoland McGrath siginfo_t siginfo; 751032d82d9SRoland McGrath int ret; 752032d82d9SRoland McGrath 753032d82d9SRoland McGrath switch (request) { 754032d82d9SRoland McGrath case PTRACE_PEEKTEXT: 755032d82d9SRoland McGrath case PTRACE_PEEKDATA: 756032d82d9SRoland McGrath ret = access_process_vm(child, addr, &word, sizeof(word), 0); 757032d82d9SRoland McGrath if (ret != sizeof(word)) 758032d82d9SRoland McGrath ret = -EIO; 759032d82d9SRoland McGrath else 760032d82d9SRoland McGrath ret = put_user(word, datap); 761032d82d9SRoland McGrath break; 762032d82d9SRoland McGrath 763032d82d9SRoland McGrath case PTRACE_POKETEXT: 764032d82d9SRoland McGrath case PTRACE_POKEDATA: 765032d82d9SRoland McGrath ret = access_process_vm(child, addr, &data, sizeof(data), 1); 766032d82d9SRoland McGrath ret = (ret != sizeof(data) ? -EIO : 0); 767032d82d9SRoland McGrath break; 768032d82d9SRoland McGrath 769032d82d9SRoland McGrath case PTRACE_GETEVENTMSG: 770032d82d9SRoland McGrath ret = put_user((compat_ulong_t) child->ptrace_message, datap); 771032d82d9SRoland McGrath break; 772032d82d9SRoland McGrath 773e16b2781SRoland McGrath case PTRACE_GETSIGINFO: 774e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 775e16b2781SRoland McGrath if (!ret) 776e16b2781SRoland McGrath ret = copy_siginfo_to_user32( 777e16b2781SRoland McGrath (struct compat_siginfo __user *) datap, 778e16b2781SRoland McGrath &siginfo); 779e16b2781SRoland McGrath break; 780e16b2781SRoland McGrath 781e16b2781SRoland McGrath case PTRACE_SETSIGINFO: 782e16b2781SRoland McGrath memset(&siginfo, 0, sizeof siginfo); 783e16b2781SRoland McGrath if (copy_siginfo_from_user32( 784e16b2781SRoland McGrath &siginfo, (struct compat_siginfo __user *) datap)) 785e16b2781SRoland McGrath ret = -EFAULT; 786e16b2781SRoland McGrath else 787e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 788e16b2781SRoland McGrath break; 7892225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 7902225a122SSuresh Siddha case PTRACE_GETREGSET: 7912225a122SSuresh Siddha case PTRACE_SETREGSET: 7922225a122SSuresh Siddha { 7932225a122SSuresh Siddha struct iovec kiov; 7942225a122SSuresh Siddha struct compat_iovec __user *uiov = 7952225a122SSuresh Siddha (struct compat_iovec __user *) datap; 7962225a122SSuresh Siddha compat_uptr_t ptr; 7972225a122SSuresh Siddha compat_size_t len; 7982225a122SSuresh Siddha 7992225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 8002225a122SSuresh Siddha return -EFAULT; 8012225a122SSuresh Siddha 8022225a122SSuresh Siddha if (__get_user(ptr, &uiov->iov_base) || 8032225a122SSuresh Siddha __get_user(len, &uiov->iov_len)) 8042225a122SSuresh Siddha return -EFAULT; 8052225a122SSuresh Siddha 8062225a122SSuresh Siddha kiov.iov_base = compat_ptr(ptr); 8072225a122SSuresh Siddha kiov.iov_len = len; 8082225a122SSuresh Siddha 8092225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 8102225a122SSuresh Siddha if (!ret) 8112225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 8122225a122SSuresh Siddha break; 8132225a122SSuresh Siddha } 8142225a122SSuresh Siddha #endif 815e16b2781SRoland McGrath 816032d82d9SRoland McGrath default: 817032d82d9SRoland McGrath ret = ptrace_request(child, request, addr, data); 818032d82d9SRoland McGrath } 819032d82d9SRoland McGrath 820032d82d9SRoland McGrath return ret; 821032d82d9SRoland McGrath } 822c269f196SRoland McGrath 823c269f196SRoland McGrath asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, 824c269f196SRoland McGrath compat_long_t addr, compat_long_t data) 825c269f196SRoland McGrath { 826c269f196SRoland McGrath struct task_struct *child; 827c269f196SRoland McGrath long ret; 828c269f196SRoland McGrath 829c269f196SRoland McGrath if (request == PTRACE_TRACEME) { 830c269f196SRoland McGrath ret = ptrace_traceme(); 831c269f196SRoland McGrath goto out; 832c269f196SRoland McGrath } 833c269f196SRoland McGrath 834c269f196SRoland McGrath child = ptrace_get_task_struct(pid); 835c269f196SRoland McGrath if (IS_ERR(child)) { 836c269f196SRoland McGrath ret = PTR_ERR(child); 837c269f196SRoland McGrath goto out; 838c269f196SRoland McGrath } 839c269f196SRoland McGrath 840c269f196SRoland McGrath if (request == PTRACE_ATTACH) { 841c269f196SRoland McGrath ret = ptrace_attach(child); 842c269f196SRoland McGrath /* 843c269f196SRoland McGrath * Some architectures need to do book-keeping after 844c269f196SRoland McGrath * a ptrace attach. 845c269f196SRoland McGrath */ 846c269f196SRoland McGrath if (!ret) 847c269f196SRoland McGrath arch_ptrace_attach(child); 848c269f196SRoland McGrath goto out_put_task_struct; 849c269f196SRoland McGrath } 850c269f196SRoland McGrath 851c269f196SRoland McGrath ret = ptrace_check_attach(child, request == PTRACE_KILL); 852c269f196SRoland McGrath if (!ret) 853c269f196SRoland McGrath ret = compat_arch_ptrace(child, request, addr, data); 854c269f196SRoland McGrath 855c269f196SRoland McGrath out_put_task_struct: 856c269f196SRoland McGrath put_task_struct(child); 857c269f196SRoland McGrath out: 858c269f196SRoland McGrath return ret; 859c269f196SRoland McGrath } 86096b8936aSChristoph Hellwig #endif /* CONFIG_COMPAT */ 861