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 40e3bd058fSTejun Heo /** 41e3bd058fSTejun Heo * __ptrace_unlink - unlink ptracee and restore its execution state 42e3bd058fSTejun Heo * @child: ptracee to be unlinked 43e3bd058fSTejun Heo * 44e3bd058fSTejun Heo * Remove @child from the ptrace list, move it back to the original parent. 45e3bd058fSTejun Heo * 46e3bd058fSTejun Heo * CONTEXT: 47e3bd058fSTejun Heo * write_lock_irq(tasklist_lock) 481da177e4SLinus Torvalds */ 49e3bd058fSTejun Heo void __ptrace_unlink(struct task_struct *child) 501da177e4SLinus Torvalds { 51e3bd058fSTejun Heo BUG_ON(!child->ptrace); 52e3bd058fSTejun Heo 53e3bd058fSTejun Heo child->ptrace = 0; 54e3bd058fSTejun Heo child->parent = child->real_parent; 55e3bd058fSTejun Heo list_del_init(&child->ptrace_entry); 56e3bd058fSTejun Heo 571da177e4SLinus Torvalds spin_lock(&child->sighand->siglock); 586618a3e2SMatthew Wilcox if (task_is_traced(child)) { 591ee11844SOleg Nesterov /* 60d79fdd6dSTejun Heo * If group stop is completed or in progress, it should 61d79fdd6dSTejun Heo * participate in the group stop. Set GROUP_STOP_PENDING 62d79fdd6dSTejun Heo * before kicking it. 63d79fdd6dSTejun Heo * 64d79fdd6dSTejun Heo * This involves TRACED -> RUNNING -> STOPPED transition 65d79fdd6dSTejun Heo * which is similar to but in the opposite direction of 66d79fdd6dSTejun Heo * what happens while attaching to a stopped task. 67d79fdd6dSTejun Heo * However, in this direction, the intermediate RUNNING 68d79fdd6dSTejun Heo * state is not hidden even from the current ptracer and if 69d79fdd6dSTejun Heo * it immediately re-attaches and performs a WNOHANG 70d79fdd6dSTejun Heo * wait(2), it may fail. 711ee11844SOleg Nesterov */ 721ee11844SOleg Nesterov if (child->signal->flags & SIGNAL_STOP_STOPPED || 731ee11844SOleg Nesterov child->signal->group_stop_count) 74d79fdd6dSTejun Heo child->group_stop |= GROUP_STOP_PENDING; 751da177e4SLinus Torvalds signal_wake_up(child, 1); 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds spin_unlock(&child->sighand->siglock); 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* 811da177e4SLinus Torvalds * Check that we have indeed attached to the thing.. 821da177e4SLinus Torvalds */ 831da177e4SLinus Torvalds int ptrace_check_attach(struct task_struct *child, int kill) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds int ret = -ESRCH; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* 881da177e4SLinus Torvalds * We take the read lock around doing both checks to close a 891da177e4SLinus Torvalds * possible race where someone else was tracing our child and 901da177e4SLinus Torvalds * detached between these two checks. After this locked check, 911da177e4SLinus Torvalds * we are sure that this is our traced child and that can only 921da177e4SLinus Torvalds * be changed by us so it's not changing right after this. 931da177e4SLinus Torvalds */ 941da177e4SLinus Torvalds read_lock(&tasklist_lock); 95c0c0b649SOleg Nesterov if ((child->ptrace & PT_PTRACED) && child->parent == current) { 961da177e4SLinus Torvalds ret = 0; 97c0c0b649SOleg Nesterov /* 98c0c0b649SOleg Nesterov * child->sighand can't be NULL, release_task() 99c0c0b649SOleg Nesterov * does ptrace_unlink() before __exit_signal(). 100c0c0b649SOleg Nesterov */ 1011da177e4SLinus Torvalds spin_lock_irq(&child->sighand->siglock); 102d9ae90acSOleg Nesterov if (task_is_stopped(child)) 1031da177e4SLinus Torvalds child->state = TASK_TRACED; 104d9ae90acSOleg Nesterov else if (!task_is_traced(child) && !kill) 1051da177e4SLinus Torvalds ret = -ESRCH; 1061da177e4SLinus Torvalds spin_unlock_irq(&child->sighand->siglock); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds read_unlock(&tasklist_lock); 1091da177e4SLinus Torvalds 110d9ae90acSOleg Nesterov if (!ret && !kill) 11185ba2d86SRoland McGrath ret = wait_task_inactive(child, TASK_TRACED) ? 0 : -ESRCH; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* All systems go.. */ 1141da177e4SLinus Torvalds return ret; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 117006ebb40SStephen Smalley int __ptrace_may_access(struct task_struct *task, unsigned int mode) 118ab8d11beSMiklos Szeredi { 119c69e8d9cSDavid Howells const struct cred *cred = current_cred(), *tcred; 120b6dff3ecSDavid Howells 121df26c40eSEric W. Biederman /* May we inspect the given task? 122df26c40eSEric W. Biederman * This check is used both for attaching with ptrace 123df26c40eSEric W. Biederman * and for allowing access to sensitive information in /proc. 124df26c40eSEric W. Biederman * 125df26c40eSEric W. Biederman * ptrace_attach denies several cases that /proc allows 126df26c40eSEric W. Biederman * because setting up the necessary parent/child relationship 127df26c40eSEric W. Biederman * or halting the specified task is impossible. 128df26c40eSEric W. Biederman */ 129df26c40eSEric W. Biederman int dumpable = 0; 130df26c40eSEric W. Biederman /* Don't let security modules deny introspection */ 131df26c40eSEric W. Biederman if (task == current) 132df26c40eSEric W. Biederman return 0; 133c69e8d9cSDavid Howells rcu_read_lock(); 134c69e8d9cSDavid Howells tcred = __task_cred(task); 135c69e8d9cSDavid Howells if ((cred->uid != tcred->euid || 136c69e8d9cSDavid Howells cred->uid != tcred->suid || 137c69e8d9cSDavid Howells cred->uid != tcred->uid || 138c69e8d9cSDavid Howells cred->gid != tcred->egid || 139c69e8d9cSDavid Howells cred->gid != tcred->sgid || 140c69e8d9cSDavid Howells cred->gid != tcred->gid) && 141c69e8d9cSDavid Howells !capable(CAP_SYS_PTRACE)) { 142c69e8d9cSDavid Howells rcu_read_unlock(); 143ab8d11beSMiklos Szeredi return -EPERM; 144c69e8d9cSDavid Howells } 145c69e8d9cSDavid Howells rcu_read_unlock(); 146ab8d11beSMiklos Szeredi smp_rmb(); 147df26c40eSEric W. Biederman if (task->mm) 1486c5d5238SKawai, Hidehiro dumpable = get_dumpable(task->mm); 149df26c40eSEric W. Biederman if (!dumpable && !capable(CAP_SYS_PTRACE)) 150ab8d11beSMiklos Szeredi return -EPERM; 151ab8d11beSMiklos Szeredi 1529e48858fSIngo Molnar return security_ptrace_access_check(task, mode); 153ab8d11beSMiklos Szeredi } 154ab8d11beSMiklos Szeredi 155006ebb40SStephen Smalley bool ptrace_may_access(struct task_struct *task, unsigned int mode) 156ab8d11beSMiklos Szeredi { 157ab8d11beSMiklos Szeredi int err; 158ab8d11beSMiklos Szeredi task_lock(task); 159006ebb40SStephen Smalley err = __ptrace_may_access(task, mode); 160ab8d11beSMiklos Szeredi task_unlock(task); 1613a709703SRoland McGrath return !err; 162ab8d11beSMiklos Szeredi } 163ab8d11beSMiklos Szeredi 164e3e89cc5SLinus Torvalds static int ptrace_attach(struct task_struct *task) 1651da177e4SLinus Torvalds { 166d79fdd6dSTejun Heo bool wait_trap = false; 1671da177e4SLinus Torvalds int retval; 168f5b40e36SLinus Torvalds 169a5cb013dSAl Viro audit_ptrace(task); 170a5cb013dSAl Viro 1711da177e4SLinus Torvalds retval = -EPERM; 172b79b7ba9SOleg Nesterov if (unlikely(task->flags & PF_KTHREAD)) 173b79b7ba9SOleg Nesterov goto out; 174bac0abd6SPavel Emelyanov if (same_thread_group(task, current)) 175f5b40e36SLinus Torvalds goto out; 176f5b40e36SLinus Torvalds 177f2f0b00aSOleg Nesterov /* 178f2f0b00aSOleg Nesterov * Protect exec's credential calculations against our interference; 1795e751e99SDavid Howells * interference; SUID, SGID and LSM creds get determined differently 1805e751e99SDavid Howells * under ptrace. 181d84f4f99SDavid Howells */ 182793285fcSOleg Nesterov retval = -ERESTARTNOINTR; 1839b1bf12dSKOSAKI Motohiro if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) 184d84f4f99SDavid Howells goto out; 1854b105cbbSOleg Nesterov 186f5b40e36SLinus Torvalds task_lock(task); 187006ebb40SStephen Smalley retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); 1884b105cbbSOleg Nesterov task_unlock(task); 1891da177e4SLinus Torvalds if (retval) 1904b105cbbSOleg Nesterov goto unlock_creds; 1911da177e4SLinus Torvalds 1924b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 193b79b7ba9SOleg Nesterov retval = -EPERM; 194b79b7ba9SOleg Nesterov if (unlikely(task->exit_state)) 1954b105cbbSOleg Nesterov goto unlock_tasklist; 196f2f0b00aSOleg Nesterov if (task->ptrace) 1974b105cbbSOleg Nesterov goto unlock_tasklist; 198b79b7ba9SOleg Nesterov 199f2f0b00aSOleg Nesterov task->ptrace = PT_PTRACED; 2001da177e4SLinus Torvalds if (capable(CAP_SYS_PTRACE)) 2011da177e4SLinus Torvalds task->ptrace |= PT_PTRACE_CAP; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds __ptrace_link(task, current); 20433e9fc7dSOleg Nesterov send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); 205b79b7ba9SOleg Nesterov 206d79fdd6dSTejun Heo spin_lock(&task->sighand->siglock); 207d79fdd6dSTejun Heo 208d79fdd6dSTejun Heo /* 209d79fdd6dSTejun Heo * If the task is already STOPPED, set GROUP_STOP_PENDING and 210d79fdd6dSTejun Heo * TRAPPING, and kick it so that it transits to TRACED. TRAPPING 211d79fdd6dSTejun Heo * will be cleared if the child completes the transition or any 212d79fdd6dSTejun Heo * event which clears the group stop states happens. We'll wait 213d79fdd6dSTejun Heo * for the transition to complete before returning from this 214d79fdd6dSTejun Heo * function. 215d79fdd6dSTejun Heo * 216d79fdd6dSTejun Heo * This hides STOPPED -> RUNNING -> TRACED transition from the 217d79fdd6dSTejun Heo * attaching thread but a different thread in the same group can 218d79fdd6dSTejun Heo * still observe the transient RUNNING state. IOW, if another 219d79fdd6dSTejun Heo * thread's WNOHANG wait(2) on the stopped tracee races against 220d79fdd6dSTejun Heo * ATTACH, the wait(2) may fail due to the transient RUNNING. 221d79fdd6dSTejun Heo * 222d79fdd6dSTejun Heo * The following task_is_stopped() test is safe as both transitions 223d79fdd6dSTejun Heo * in and out of STOPPED are protected by siglock. 224d79fdd6dSTejun Heo */ 225d79fdd6dSTejun Heo if (task_is_stopped(task)) { 226d79fdd6dSTejun Heo task->group_stop |= GROUP_STOP_PENDING | GROUP_STOP_TRAPPING; 227d79fdd6dSTejun Heo signal_wake_up(task, 1); 228d79fdd6dSTejun Heo wait_trap = true; 229d79fdd6dSTejun Heo } 230d79fdd6dSTejun Heo 231d79fdd6dSTejun Heo spin_unlock(&task->sighand->siglock); 232d79fdd6dSTejun Heo 233b79b7ba9SOleg Nesterov retval = 0; 2344b105cbbSOleg Nesterov unlock_tasklist: 2354b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2364b105cbbSOleg Nesterov unlock_creds: 2379b1bf12dSKOSAKI Motohiro mutex_unlock(&task->signal->cred_guard_mutex); 238f5b40e36SLinus Torvalds out: 239d79fdd6dSTejun Heo if (wait_trap) 240d79fdd6dSTejun Heo wait_event(current->signal->wait_chldexit, 241d79fdd6dSTejun Heo !(task->group_stop & GROUP_STOP_TRAPPING)); 2421da177e4SLinus Torvalds return retval; 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 245f2f0b00aSOleg Nesterov /** 246f2f0b00aSOleg Nesterov * ptrace_traceme -- helper for PTRACE_TRACEME 247f2f0b00aSOleg Nesterov * 248f2f0b00aSOleg Nesterov * Performs checks and sets PT_PTRACED. 249f2f0b00aSOleg Nesterov * Should be used by all ptrace implementations for PTRACE_TRACEME. 250f2f0b00aSOleg Nesterov */ 251e3e89cc5SLinus Torvalds static int ptrace_traceme(void) 252f2f0b00aSOleg Nesterov { 253f2f0b00aSOleg Nesterov int ret = -EPERM; 254f2f0b00aSOleg Nesterov 2554b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 2564b105cbbSOleg Nesterov /* Are we already being traced? */ 257f2f0b00aSOleg Nesterov if (!current->ptrace) { 258f2f0b00aSOleg Nesterov ret = security_ptrace_traceme(current->parent); 259f2f0b00aSOleg Nesterov /* 260f2f0b00aSOleg Nesterov * Check PF_EXITING to ensure ->real_parent has not passed 261f2f0b00aSOleg Nesterov * exit_ptrace(). Otherwise we don't report the error but 262f2f0b00aSOleg Nesterov * pretend ->real_parent untraces us right after return. 263f2f0b00aSOleg Nesterov */ 264f2f0b00aSOleg Nesterov if (!ret && !(current->real_parent->flags & PF_EXITING)) { 265f2f0b00aSOleg Nesterov current->ptrace = PT_PTRACED; 266f2f0b00aSOleg Nesterov __ptrace_link(current, current->real_parent); 267f2f0b00aSOleg Nesterov } 268f2f0b00aSOleg Nesterov } 2694b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 2704b105cbbSOleg Nesterov 271f2f0b00aSOleg Nesterov return ret; 272f2f0b00aSOleg Nesterov } 273f2f0b00aSOleg Nesterov 27439c626aeSOleg Nesterov /* 27539c626aeSOleg Nesterov * Called with irqs disabled, returns true if childs should reap themselves. 27639c626aeSOleg Nesterov */ 27739c626aeSOleg Nesterov static int ignoring_children(struct sighand_struct *sigh) 27839c626aeSOleg Nesterov { 27939c626aeSOleg Nesterov int ret; 28039c626aeSOleg Nesterov spin_lock(&sigh->siglock); 28139c626aeSOleg Nesterov ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || 28239c626aeSOleg Nesterov (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); 28339c626aeSOleg Nesterov spin_unlock(&sigh->siglock); 28439c626aeSOleg Nesterov return ret; 28539c626aeSOleg Nesterov } 28639c626aeSOleg Nesterov 28739c626aeSOleg Nesterov /* 28839c626aeSOleg Nesterov * Called with tasklist_lock held for writing. 28939c626aeSOleg Nesterov * Unlink a traced task, and clean it up if it was a traced zombie. 29039c626aeSOleg Nesterov * Return true if it needs to be reaped with release_task(). 29139c626aeSOleg Nesterov * (We can't call release_task() here because we already hold tasklist_lock.) 29239c626aeSOleg Nesterov * 29339c626aeSOleg Nesterov * If it's a zombie, our attachedness prevented normal parent notification 29439c626aeSOleg Nesterov * or self-reaping. Do notification now if it would have happened earlier. 29539c626aeSOleg Nesterov * If it should reap itself, return true. 29639c626aeSOleg Nesterov * 297a7f0765eSOleg Nesterov * If it's our own child, there is no notification to do. But if our normal 298a7f0765eSOleg Nesterov * children self-reap, then this child was prevented by ptrace and we must 299a7f0765eSOleg Nesterov * reap it now, in that case we must also wake up sub-threads sleeping in 300a7f0765eSOleg Nesterov * do_wait(). 30139c626aeSOleg Nesterov */ 30239c626aeSOleg Nesterov static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) 30339c626aeSOleg Nesterov { 30439c626aeSOleg Nesterov __ptrace_unlink(p); 30539c626aeSOleg Nesterov 30639c626aeSOleg Nesterov if (p->exit_state == EXIT_ZOMBIE) { 30739c626aeSOleg Nesterov if (!task_detached(p) && thread_group_empty(p)) { 30839c626aeSOleg Nesterov if (!same_thread_group(p->real_parent, tracer)) 30939c626aeSOleg Nesterov do_notify_parent(p, p->exit_signal); 310a7f0765eSOleg Nesterov else if (ignoring_children(tracer->sighand)) { 311a7f0765eSOleg Nesterov __wake_up_parent(p, tracer); 31239c626aeSOleg Nesterov p->exit_signal = -1; 31339c626aeSOleg Nesterov } 314a7f0765eSOleg Nesterov } 31539c626aeSOleg Nesterov if (task_detached(p)) { 31639c626aeSOleg Nesterov /* Mark it as in the process of being reaped. */ 31739c626aeSOleg Nesterov p->exit_state = EXIT_DEAD; 31839c626aeSOleg Nesterov return true; 31939c626aeSOleg Nesterov } 32039c626aeSOleg Nesterov } 32139c626aeSOleg Nesterov 32239c626aeSOleg Nesterov return false; 32339c626aeSOleg Nesterov } 32439c626aeSOleg Nesterov 325e3e89cc5SLinus Torvalds static int ptrace_detach(struct task_struct *child, unsigned int data) 3261da177e4SLinus Torvalds { 32739c626aeSOleg Nesterov bool dead = false; 3284576145cSOleg Nesterov 3297ed20e1aSJesper Juhl if (!valid_signal(data)) 3301da177e4SLinus Torvalds return -EIO; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* Architecture-specific hardware disable .. */ 3331da177e4SLinus Torvalds ptrace_disable(child); 3347d941432SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 3351da177e4SLinus Torvalds 33695c3eb76SOleg Nesterov write_lock_irq(&tasklist_lock); 33739c626aeSOleg Nesterov /* 33839c626aeSOleg Nesterov * This child can be already killed. Make sure de_thread() or 33939c626aeSOleg Nesterov * our sub-thread doing do_wait() didn't do release_task() yet. 34039c626aeSOleg Nesterov */ 34195c3eb76SOleg Nesterov if (child->ptrace) { 34295c3eb76SOleg Nesterov child->exit_code = data; 3434576145cSOleg Nesterov dead = __ptrace_detach(current, child); 34495c3eb76SOleg Nesterov } 3451da177e4SLinus Torvalds write_unlock_irq(&tasklist_lock); 3461da177e4SLinus Torvalds 3474576145cSOleg Nesterov if (unlikely(dead)) 3484576145cSOleg Nesterov release_task(child); 3494576145cSOleg Nesterov 3501da177e4SLinus Torvalds return 0; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 35339c626aeSOleg Nesterov /* 354c7e49c14SOleg Nesterov * Detach all tasks we were using ptrace on. Called with tasklist held 355c7e49c14SOleg Nesterov * for writing, and returns with it held too. But note it can release 356c7e49c14SOleg Nesterov * and reacquire the lock. 35739c626aeSOleg Nesterov */ 35839c626aeSOleg Nesterov void exit_ptrace(struct task_struct *tracer) 359c4b5ed25SNamhyung Kim __releases(&tasklist_lock) 360c4b5ed25SNamhyung Kim __acquires(&tasklist_lock) 36139c626aeSOleg Nesterov { 36239c626aeSOleg Nesterov struct task_struct *p, *n; 36339c626aeSOleg Nesterov LIST_HEAD(ptrace_dead); 36439c626aeSOleg Nesterov 365c7e49c14SOleg Nesterov if (likely(list_empty(&tracer->ptraced))) 366c7e49c14SOleg Nesterov return; 367c7e49c14SOleg Nesterov 36839c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { 36939c626aeSOleg Nesterov if (__ptrace_detach(tracer, p)) 37039c626aeSOleg Nesterov list_add(&p->ptrace_entry, &ptrace_dead); 37139c626aeSOleg Nesterov } 37239c626aeSOleg Nesterov 373c7e49c14SOleg Nesterov write_unlock_irq(&tasklist_lock); 37439c626aeSOleg Nesterov BUG_ON(!list_empty(&tracer->ptraced)); 37539c626aeSOleg Nesterov 37639c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) { 37739c626aeSOleg Nesterov list_del_init(&p->ptrace_entry); 37839c626aeSOleg Nesterov release_task(p); 37939c626aeSOleg Nesterov } 380c7e49c14SOleg Nesterov 381c7e49c14SOleg Nesterov write_lock_irq(&tasklist_lock); 38239c626aeSOleg Nesterov } 38339c626aeSOleg Nesterov 3841da177e4SLinus Torvalds int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) 3851da177e4SLinus Torvalds { 3861da177e4SLinus Torvalds int copied = 0; 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds while (len > 0) { 3891da177e4SLinus Torvalds char buf[128]; 3901da177e4SLinus Torvalds int this_len, retval; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 3931da177e4SLinus Torvalds retval = access_process_vm(tsk, src, buf, this_len, 0); 3941da177e4SLinus Torvalds if (!retval) { 3951da177e4SLinus Torvalds if (copied) 3961da177e4SLinus Torvalds break; 3971da177e4SLinus Torvalds return -EIO; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds if (copy_to_user(dst, buf, retval)) 4001da177e4SLinus Torvalds return -EFAULT; 4011da177e4SLinus Torvalds copied += retval; 4021da177e4SLinus Torvalds src += retval; 4031da177e4SLinus Torvalds dst += retval; 4041da177e4SLinus Torvalds len -= retval; 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds return copied; 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) 4101da177e4SLinus Torvalds { 4111da177e4SLinus Torvalds int copied = 0; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds while (len > 0) { 4141da177e4SLinus Torvalds char buf[128]; 4151da177e4SLinus Torvalds int this_len, retval; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 4181da177e4SLinus Torvalds if (copy_from_user(buf, src, this_len)) 4191da177e4SLinus Torvalds return -EFAULT; 4201da177e4SLinus Torvalds retval = access_process_vm(tsk, dst, buf, this_len, 1); 4211da177e4SLinus Torvalds if (!retval) { 4221da177e4SLinus Torvalds if (copied) 4231da177e4SLinus Torvalds break; 4241da177e4SLinus Torvalds return -EIO; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds copied += retval; 4271da177e4SLinus Torvalds src += retval; 4281da177e4SLinus Torvalds dst += retval; 4291da177e4SLinus Torvalds len -= retval; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds return copied; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds 4344abf9869SNamhyung Kim static int ptrace_setoptions(struct task_struct *child, unsigned long data) 4351da177e4SLinus Torvalds { 4361da177e4SLinus Torvalds child->ptrace &= ~PT_TRACE_MASK; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds if (data & PTRACE_O_TRACESYSGOOD) 4391da177e4SLinus Torvalds child->ptrace |= PT_TRACESYSGOOD; 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds if (data & PTRACE_O_TRACEFORK) 4421da177e4SLinus Torvalds child->ptrace |= PT_TRACE_FORK; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORK) 4451da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK; 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds if (data & PTRACE_O_TRACECLONE) 4481da177e4SLinus Torvalds child->ptrace |= PT_TRACE_CLONE; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXEC) 4511da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXEC; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds if (data & PTRACE_O_TRACEVFORKDONE) 4541da177e4SLinus Torvalds child->ptrace |= PT_TRACE_VFORK_DONE; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds if (data & PTRACE_O_TRACEEXIT) 4571da177e4SLinus Torvalds child->ptrace |= PT_TRACE_EXIT; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds return (data & ~PTRACE_O_MASK) ? -EINVAL : 0; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 462e16b2781SRoland McGrath static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) 4631da177e4SLinus Torvalds { 464e4961254SOleg Nesterov unsigned long flags; 4651da177e4SLinus Torvalds int error = -ESRCH; 4661da177e4SLinus Torvalds 467e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4681da177e4SLinus Torvalds error = -EINVAL; 4691da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 470e16b2781SRoland McGrath *info = *child->last_siginfo; 4711da177e4SLinus Torvalds error = 0; 4721da177e4SLinus Torvalds } 473e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds return error; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 478e16b2781SRoland McGrath static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) 4791da177e4SLinus Torvalds { 480e4961254SOleg Nesterov unsigned long flags; 4811da177e4SLinus Torvalds int error = -ESRCH; 4821da177e4SLinus Torvalds 483e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 4841da177e4SLinus Torvalds error = -EINVAL; 4851da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 486e16b2781SRoland McGrath *child->last_siginfo = *info; 4871da177e4SLinus Torvalds error = 0; 4881da177e4SLinus Torvalds } 489e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds return error; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 49436df29d7SRoland McGrath 49536df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 49636df29d7SRoland McGrath #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) 49736df29d7SRoland McGrath #else 49836df29d7SRoland McGrath #define is_singlestep(request) 0 49936df29d7SRoland McGrath #endif 50036df29d7SRoland McGrath 5015b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 5025b88abbfSRoland McGrath #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) 5035b88abbfSRoland McGrath #else 5045b88abbfSRoland McGrath #define is_singleblock(request) 0 5055b88abbfSRoland McGrath #endif 5065b88abbfSRoland McGrath 50736df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 50836df29d7SRoland McGrath #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) 50936df29d7SRoland McGrath #else 51036df29d7SRoland McGrath #define is_sysemu_singlestep(request) 0 51136df29d7SRoland McGrath #endif 51236df29d7SRoland McGrath 5134abf9869SNamhyung Kim static int ptrace_resume(struct task_struct *child, long request, 5144abf9869SNamhyung Kim unsigned long data) 51536df29d7SRoland McGrath { 51636df29d7SRoland McGrath if (!valid_signal(data)) 51736df29d7SRoland McGrath return -EIO; 51836df29d7SRoland McGrath 51936df29d7SRoland McGrath if (request == PTRACE_SYSCALL) 52036df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 52136df29d7SRoland McGrath else 52236df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 52336df29d7SRoland McGrath 52436df29d7SRoland McGrath #ifdef TIF_SYSCALL_EMU 52536df29d7SRoland McGrath if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) 52636df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 52736df29d7SRoland McGrath else 52836df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 52936df29d7SRoland McGrath #endif 53036df29d7SRoland McGrath 5315b88abbfSRoland McGrath if (is_singleblock(request)) { 5325b88abbfSRoland McGrath if (unlikely(!arch_has_block_step())) 5335b88abbfSRoland McGrath return -EIO; 5345b88abbfSRoland McGrath user_enable_block_step(child); 5355b88abbfSRoland McGrath } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { 53636df29d7SRoland McGrath if (unlikely(!arch_has_single_step())) 53736df29d7SRoland McGrath return -EIO; 53836df29d7SRoland McGrath user_enable_single_step(child); 5393a709703SRoland McGrath } else { 54036df29d7SRoland McGrath user_disable_single_step(child); 5413a709703SRoland McGrath } 54236df29d7SRoland McGrath 54336df29d7SRoland McGrath child->exit_code = data; 54436df29d7SRoland McGrath wake_up_process(child); 54536df29d7SRoland McGrath 54636df29d7SRoland McGrath return 0; 54736df29d7SRoland McGrath } 54836df29d7SRoland McGrath 5492225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 5502225a122SSuresh Siddha 5512225a122SSuresh Siddha static const struct user_regset * 5522225a122SSuresh Siddha find_regset(const struct user_regset_view *view, unsigned int type) 5532225a122SSuresh Siddha { 5542225a122SSuresh Siddha const struct user_regset *regset; 5552225a122SSuresh Siddha int n; 5562225a122SSuresh Siddha 5572225a122SSuresh Siddha for (n = 0; n < view->n; ++n) { 5582225a122SSuresh Siddha regset = view->regsets + n; 5592225a122SSuresh Siddha if (regset->core_note_type == type) 5602225a122SSuresh Siddha return regset; 5612225a122SSuresh Siddha } 5622225a122SSuresh Siddha 5632225a122SSuresh Siddha return NULL; 5642225a122SSuresh Siddha } 5652225a122SSuresh Siddha 5662225a122SSuresh Siddha static int ptrace_regset(struct task_struct *task, int req, unsigned int type, 5672225a122SSuresh Siddha struct iovec *kiov) 5682225a122SSuresh Siddha { 5692225a122SSuresh Siddha const struct user_regset_view *view = task_user_regset_view(task); 5702225a122SSuresh Siddha const struct user_regset *regset = find_regset(view, type); 5712225a122SSuresh Siddha int regset_no; 5722225a122SSuresh Siddha 5732225a122SSuresh Siddha if (!regset || (kiov->iov_len % regset->size) != 0) 574c6a0dd7eSSuresh Siddha return -EINVAL; 5752225a122SSuresh Siddha 5762225a122SSuresh Siddha regset_no = regset - view->regsets; 5772225a122SSuresh Siddha kiov->iov_len = min(kiov->iov_len, 5782225a122SSuresh Siddha (__kernel_size_t) (regset->n * regset->size)); 5792225a122SSuresh Siddha 5802225a122SSuresh Siddha if (req == PTRACE_GETREGSET) 5812225a122SSuresh Siddha return copy_regset_to_user(task, view, regset_no, 0, 5822225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5832225a122SSuresh Siddha else 5842225a122SSuresh Siddha return copy_regset_from_user(task, view, regset_no, 0, 5852225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 5862225a122SSuresh Siddha } 5872225a122SSuresh Siddha 5882225a122SSuresh Siddha #endif 5892225a122SSuresh Siddha 5901da177e4SLinus Torvalds int ptrace_request(struct task_struct *child, long request, 5914abf9869SNamhyung Kim unsigned long addr, unsigned long data) 5921da177e4SLinus Torvalds { 5931da177e4SLinus Torvalds int ret = -EIO; 594e16b2781SRoland McGrath siginfo_t siginfo; 5959fed81dcSNamhyung Kim void __user *datavp = (void __user *) data; 5969fed81dcSNamhyung Kim unsigned long __user *datalp = datavp; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds switch (request) { 59916c3e389SRoland McGrath case PTRACE_PEEKTEXT: 60016c3e389SRoland McGrath case PTRACE_PEEKDATA: 60116c3e389SRoland McGrath return generic_ptrace_peekdata(child, addr, data); 60216c3e389SRoland McGrath case PTRACE_POKETEXT: 60316c3e389SRoland McGrath case PTRACE_POKEDATA: 60416c3e389SRoland McGrath return generic_ptrace_pokedata(child, addr, data); 60516c3e389SRoland McGrath 6061da177e4SLinus Torvalds #ifdef PTRACE_OLDSETOPTIONS 6071da177e4SLinus Torvalds case PTRACE_OLDSETOPTIONS: 6081da177e4SLinus Torvalds #endif 6091da177e4SLinus Torvalds case PTRACE_SETOPTIONS: 6101da177e4SLinus Torvalds ret = ptrace_setoptions(child, data); 6111da177e4SLinus Torvalds break; 6121da177e4SLinus Torvalds case PTRACE_GETEVENTMSG: 6139fed81dcSNamhyung Kim ret = put_user(child->ptrace_message, datalp); 6141da177e4SLinus Torvalds break; 615e16b2781SRoland McGrath 6161da177e4SLinus Torvalds case PTRACE_GETSIGINFO: 617e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 618e16b2781SRoland McGrath if (!ret) 6199fed81dcSNamhyung Kim ret = copy_siginfo_to_user(datavp, &siginfo); 6201da177e4SLinus Torvalds break; 621e16b2781SRoland McGrath 6221da177e4SLinus Torvalds case PTRACE_SETSIGINFO: 6239fed81dcSNamhyung Kim if (copy_from_user(&siginfo, datavp, sizeof siginfo)) 624e16b2781SRoland McGrath ret = -EFAULT; 625e16b2781SRoland McGrath else 626e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 6271da177e4SLinus Torvalds break; 628e16b2781SRoland McGrath 6291bcf5482SAlexey Dobriyan case PTRACE_DETACH: /* detach a process that was attached. */ 6301bcf5482SAlexey Dobriyan ret = ptrace_detach(child, data); 6311bcf5482SAlexey Dobriyan break; 63236df29d7SRoland McGrath 6339c1a1259SMike Frysinger #ifdef CONFIG_BINFMT_ELF_FDPIC 6349c1a1259SMike Frysinger case PTRACE_GETFDPIC: { 635e0129ef9SOleg Nesterov struct mm_struct *mm = get_task_mm(child); 6369c1a1259SMike Frysinger unsigned long tmp = 0; 6379c1a1259SMike Frysinger 638e0129ef9SOleg Nesterov ret = -ESRCH; 639e0129ef9SOleg Nesterov if (!mm) 640e0129ef9SOleg Nesterov break; 641e0129ef9SOleg Nesterov 6429c1a1259SMike Frysinger switch (addr) { 6439c1a1259SMike Frysinger case PTRACE_GETFDPIC_EXEC: 644e0129ef9SOleg Nesterov tmp = mm->context.exec_fdpic_loadmap; 6459c1a1259SMike Frysinger break; 6469c1a1259SMike Frysinger case PTRACE_GETFDPIC_INTERP: 647e0129ef9SOleg Nesterov tmp = mm->context.interp_fdpic_loadmap; 6489c1a1259SMike Frysinger break; 6499c1a1259SMike Frysinger default: 6509c1a1259SMike Frysinger break; 6519c1a1259SMike Frysinger } 652e0129ef9SOleg Nesterov mmput(mm); 6539c1a1259SMike Frysinger 6549fed81dcSNamhyung Kim ret = put_user(tmp, datalp); 6559c1a1259SMike Frysinger break; 6569c1a1259SMike Frysinger } 6579c1a1259SMike Frysinger #endif 6589c1a1259SMike Frysinger 65936df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 66036df29d7SRoland McGrath case PTRACE_SINGLESTEP: 66136df29d7SRoland McGrath #endif 6625b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 6635b88abbfSRoland McGrath case PTRACE_SINGLEBLOCK: 6645b88abbfSRoland McGrath #endif 66536df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 66636df29d7SRoland McGrath case PTRACE_SYSEMU: 66736df29d7SRoland McGrath case PTRACE_SYSEMU_SINGLESTEP: 66836df29d7SRoland McGrath #endif 66936df29d7SRoland McGrath case PTRACE_SYSCALL: 67036df29d7SRoland McGrath case PTRACE_CONT: 67136df29d7SRoland McGrath return ptrace_resume(child, request, data); 67236df29d7SRoland McGrath 67336df29d7SRoland McGrath case PTRACE_KILL: 67436df29d7SRoland McGrath if (child->exit_state) /* already dead */ 67536df29d7SRoland McGrath return 0; 67636df29d7SRoland McGrath return ptrace_resume(child, request, SIGKILL); 67736df29d7SRoland McGrath 6782225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 6792225a122SSuresh Siddha case PTRACE_GETREGSET: 6802225a122SSuresh Siddha case PTRACE_SETREGSET: 6812225a122SSuresh Siddha { 6822225a122SSuresh Siddha struct iovec kiov; 6839fed81dcSNamhyung Kim struct iovec __user *uiov = datavp; 6842225a122SSuresh Siddha 6852225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 6862225a122SSuresh Siddha return -EFAULT; 6872225a122SSuresh Siddha 6882225a122SSuresh Siddha if (__get_user(kiov.iov_base, &uiov->iov_base) || 6892225a122SSuresh Siddha __get_user(kiov.iov_len, &uiov->iov_len)) 6902225a122SSuresh Siddha return -EFAULT; 6912225a122SSuresh Siddha 6922225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 6932225a122SSuresh Siddha if (!ret) 6942225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 6952225a122SSuresh Siddha break; 6962225a122SSuresh Siddha } 6972225a122SSuresh Siddha #endif 6981da177e4SLinus Torvalds default: 6991da177e4SLinus Torvalds break; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds return ret; 7031da177e4SLinus Torvalds } 704481bed45SChristoph Hellwig 7058053bdd5SOleg Nesterov static struct task_struct *ptrace_get_task_struct(pid_t pid) 7066b9c7ed8SChristoph Hellwig { 7076b9c7ed8SChristoph Hellwig struct task_struct *child; 7086b9c7ed8SChristoph Hellwig 7098053bdd5SOleg Nesterov rcu_read_lock(); 710228ebcbeSPavel Emelyanov child = find_task_by_vpid(pid); 711481bed45SChristoph Hellwig if (child) 712481bed45SChristoph Hellwig get_task_struct(child); 7138053bdd5SOleg Nesterov rcu_read_unlock(); 714f400e198SSukadev Bhattiprolu 715481bed45SChristoph Hellwig if (!child) 7166b9c7ed8SChristoph Hellwig return ERR_PTR(-ESRCH); 7176b9c7ed8SChristoph Hellwig return child; 718481bed45SChristoph Hellwig } 719481bed45SChristoph Hellwig 7200ac15559SChristoph Hellwig #ifndef arch_ptrace_attach 7210ac15559SChristoph Hellwig #define arch_ptrace_attach(child) do { } while (0) 7220ac15559SChristoph Hellwig #endif 7230ac15559SChristoph Hellwig 7244abf9869SNamhyung Kim SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, 7254abf9869SNamhyung Kim unsigned long, data) 726481bed45SChristoph Hellwig { 727481bed45SChristoph Hellwig struct task_struct *child; 728481bed45SChristoph Hellwig long ret; 729481bed45SChristoph Hellwig 7306b9c7ed8SChristoph Hellwig if (request == PTRACE_TRACEME) { 7316b9c7ed8SChristoph Hellwig ret = ptrace_traceme(); 7326ea6dd93SHaavard Skinnemoen if (!ret) 7336ea6dd93SHaavard Skinnemoen arch_ptrace_attach(current); 734481bed45SChristoph Hellwig goto out; 7356b9c7ed8SChristoph Hellwig } 7366b9c7ed8SChristoph Hellwig 7376b9c7ed8SChristoph Hellwig child = ptrace_get_task_struct(pid); 7386b9c7ed8SChristoph Hellwig if (IS_ERR(child)) { 7396b9c7ed8SChristoph Hellwig ret = PTR_ERR(child); 7406b9c7ed8SChristoph Hellwig goto out; 7416b9c7ed8SChristoph Hellwig } 742481bed45SChristoph Hellwig 743481bed45SChristoph Hellwig if (request == PTRACE_ATTACH) { 744481bed45SChristoph Hellwig ret = ptrace_attach(child); 7450ac15559SChristoph Hellwig /* 7460ac15559SChristoph Hellwig * Some architectures need to do book-keeping after 7470ac15559SChristoph Hellwig * a ptrace attach. 7480ac15559SChristoph Hellwig */ 7490ac15559SChristoph Hellwig if (!ret) 7500ac15559SChristoph Hellwig arch_ptrace_attach(child); 751005f18dfSChristoph Hellwig goto out_put_task_struct; 752481bed45SChristoph Hellwig } 753481bed45SChristoph Hellwig 754481bed45SChristoph Hellwig ret = ptrace_check_attach(child, request == PTRACE_KILL); 755481bed45SChristoph Hellwig if (ret < 0) 756481bed45SChristoph Hellwig goto out_put_task_struct; 757481bed45SChristoph Hellwig 758481bed45SChristoph Hellwig ret = arch_ptrace(child, request, addr, data); 759481bed45SChristoph Hellwig 760481bed45SChristoph Hellwig out_put_task_struct: 761481bed45SChristoph Hellwig put_task_struct(child); 762481bed45SChristoph Hellwig out: 763481bed45SChristoph Hellwig return ret; 764481bed45SChristoph Hellwig } 76576647323SAlexey Dobriyan 7664abf9869SNamhyung Kim int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, 7674abf9869SNamhyung Kim unsigned long data) 76876647323SAlexey Dobriyan { 76976647323SAlexey Dobriyan unsigned long tmp; 77076647323SAlexey Dobriyan int copied; 77176647323SAlexey Dobriyan 77276647323SAlexey Dobriyan copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); 77376647323SAlexey Dobriyan if (copied != sizeof(tmp)) 77476647323SAlexey Dobriyan return -EIO; 77576647323SAlexey Dobriyan return put_user(tmp, (unsigned long __user *)data); 77676647323SAlexey Dobriyan } 777f284ce72SAlexey Dobriyan 7784abf9869SNamhyung Kim int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, 7794abf9869SNamhyung Kim unsigned long data) 780f284ce72SAlexey Dobriyan { 781f284ce72SAlexey Dobriyan int copied; 782f284ce72SAlexey Dobriyan 783f284ce72SAlexey Dobriyan copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); 784f284ce72SAlexey Dobriyan return (copied == sizeof(data)) ? 0 : -EIO; 785f284ce72SAlexey Dobriyan } 786032d82d9SRoland McGrath 78796b8936aSChristoph Hellwig #if defined CONFIG_COMPAT 788032d82d9SRoland McGrath #include <linux/compat.h> 789032d82d9SRoland McGrath 790032d82d9SRoland McGrath int compat_ptrace_request(struct task_struct *child, compat_long_t request, 791032d82d9SRoland McGrath compat_ulong_t addr, compat_ulong_t data) 792032d82d9SRoland McGrath { 793032d82d9SRoland McGrath compat_ulong_t __user *datap = compat_ptr(data); 794032d82d9SRoland McGrath compat_ulong_t word; 795e16b2781SRoland McGrath siginfo_t siginfo; 796032d82d9SRoland McGrath int ret; 797032d82d9SRoland McGrath 798032d82d9SRoland McGrath switch (request) { 799032d82d9SRoland McGrath case PTRACE_PEEKTEXT: 800032d82d9SRoland McGrath case PTRACE_PEEKDATA: 801032d82d9SRoland McGrath ret = access_process_vm(child, addr, &word, sizeof(word), 0); 802032d82d9SRoland McGrath if (ret != sizeof(word)) 803032d82d9SRoland McGrath ret = -EIO; 804032d82d9SRoland McGrath else 805032d82d9SRoland McGrath ret = put_user(word, datap); 806032d82d9SRoland McGrath break; 807032d82d9SRoland McGrath 808032d82d9SRoland McGrath case PTRACE_POKETEXT: 809032d82d9SRoland McGrath case PTRACE_POKEDATA: 810032d82d9SRoland McGrath ret = access_process_vm(child, addr, &data, sizeof(data), 1); 811032d82d9SRoland McGrath ret = (ret != sizeof(data) ? -EIO : 0); 812032d82d9SRoland McGrath break; 813032d82d9SRoland McGrath 814032d82d9SRoland McGrath case PTRACE_GETEVENTMSG: 815032d82d9SRoland McGrath ret = put_user((compat_ulong_t) child->ptrace_message, datap); 816032d82d9SRoland McGrath break; 817032d82d9SRoland McGrath 818e16b2781SRoland McGrath case PTRACE_GETSIGINFO: 819e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 820e16b2781SRoland McGrath if (!ret) 821e16b2781SRoland McGrath ret = copy_siginfo_to_user32( 822e16b2781SRoland McGrath (struct compat_siginfo __user *) datap, 823e16b2781SRoland McGrath &siginfo); 824e16b2781SRoland McGrath break; 825e16b2781SRoland McGrath 826e16b2781SRoland McGrath case PTRACE_SETSIGINFO: 827e16b2781SRoland McGrath memset(&siginfo, 0, sizeof siginfo); 828e16b2781SRoland McGrath if (copy_siginfo_from_user32( 829e16b2781SRoland McGrath &siginfo, (struct compat_siginfo __user *) datap)) 830e16b2781SRoland McGrath ret = -EFAULT; 831e16b2781SRoland McGrath else 832e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 833e16b2781SRoland McGrath break; 8342225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 8352225a122SSuresh Siddha case PTRACE_GETREGSET: 8362225a122SSuresh Siddha case PTRACE_SETREGSET: 8372225a122SSuresh Siddha { 8382225a122SSuresh Siddha struct iovec kiov; 8392225a122SSuresh Siddha struct compat_iovec __user *uiov = 8402225a122SSuresh Siddha (struct compat_iovec __user *) datap; 8412225a122SSuresh Siddha compat_uptr_t ptr; 8422225a122SSuresh Siddha compat_size_t len; 8432225a122SSuresh Siddha 8442225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 8452225a122SSuresh Siddha return -EFAULT; 8462225a122SSuresh Siddha 8472225a122SSuresh Siddha if (__get_user(ptr, &uiov->iov_base) || 8482225a122SSuresh Siddha __get_user(len, &uiov->iov_len)) 8492225a122SSuresh Siddha return -EFAULT; 8502225a122SSuresh Siddha 8512225a122SSuresh Siddha kiov.iov_base = compat_ptr(ptr); 8522225a122SSuresh Siddha kiov.iov_len = len; 8532225a122SSuresh Siddha 8542225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 8552225a122SSuresh Siddha if (!ret) 8562225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 8572225a122SSuresh Siddha break; 8582225a122SSuresh Siddha } 8592225a122SSuresh Siddha #endif 860e16b2781SRoland McGrath 861032d82d9SRoland McGrath default: 862032d82d9SRoland McGrath ret = ptrace_request(child, request, addr, data); 863032d82d9SRoland McGrath } 864032d82d9SRoland McGrath 865032d82d9SRoland McGrath return ret; 866032d82d9SRoland McGrath } 867c269f196SRoland McGrath 868c269f196SRoland McGrath asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid, 869c269f196SRoland McGrath compat_long_t addr, compat_long_t data) 870c269f196SRoland McGrath { 871c269f196SRoland McGrath struct task_struct *child; 872c269f196SRoland McGrath long ret; 873c269f196SRoland McGrath 874c269f196SRoland McGrath if (request == PTRACE_TRACEME) { 875c269f196SRoland McGrath ret = ptrace_traceme(); 876c269f196SRoland McGrath goto out; 877c269f196SRoland McGrath } 878c269f196SRoland McGrath 879c269f196SRoland McGrath child = ptrace_get_task_struct(pid); 880c269f196SRoland McGrath if (IS_ERR(child)) { 881c269f196SRoland McGrath ret = PTR_ERR(child); 882c269f196SRoland McGrath goto out; 883c269f196SRoland McGrath } 884c269f196SRoland McGrath 885c269f196SRoland McGrath if (request == PTRACE_ATTACH) { 886c269f196SRoland McGrath ret = ptrace_attach(child); 887c269f196SRoland McGrath /* 888c269f196SRoland McGrath * Some architectures need to do book-keeping after 889c269f196SRoland McGrath * a ptrace attach. 890c269f196SRoland McGrath */ 891c269f196SRoland McGrath if (!ret) 892c269f196SRoland McGrath arch_ptrace_attach(child); 893c269f196SRoland McGrath goto out_put_task_struct; 894c269f196SRoland McGrath } 895c269f196SRoland McGrath 896c269f196SRoland McGrath ret = ptrace_check_attach(child, request == PTRACE_KILL); 897c269f196SRoland McGrath if (!ret) 898c269f196SRoland McGrath ret = compat_arch_ptrace(child, request, addr, data); 899c269f196SRoland McGrath 900c269f196SRoland McGrath out_put_task_struct: 901c269f196SRoland McGrath put_task_struct(child); 902c269f196SRoland McGrath out: 903c269f196SRoland McGrath return ret; 904c269f196SRoland McGrath } 90596b8936aSChristoph Hellwig #endif /* CONFIG_COMPAT */ 906