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> 119984de1aSPaul Gortmaker #include <linux/export.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> 20a27bb332SKent Overstreet #include <linux/uio.h> 21a5cb013dSAl Viro #include <linux/audit.h> 22b488893aSPavel Emelyanov #include <linux/pid_namespace.h> 23f17d30a8SAdrian Bunk #include <linux/syscalls.h> 243a709703SRoland McGrath #include <linux/uaccess.h> 252225a122SSuresh Siddha #include <linux/regset.h> 26bf26c018SFrederic Weisbecker #include <linux/hw_breakpoint.h> 27f701e5b7SVladimir Zapolskiy #include <linux/cn_proc.h> 2884c751bdSAndrey Vagin #include <linux/compat.h> 291da177e4SLinus Torvalds 30bf53de90SMarkus Metzger 31bf53de90SMarkus Metzger /* 321da177e4SLinus Torvalds * ptrace a task: make the debugger its new parent and 331da177e4SLinus Torvalds * move it to the ptrace list. 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds * Must be called with the tasklist lock write-held. 361da177e4SLinus Torvalds */ 3736c8b586SIngo Molnar void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) 381da177e4SLinus Torvalds { 39f470021aSRoland McGrath BUG_ON(!list_empty(&child->ptrace_entry)); 40f470021aSRoland McGrath list_add(&child->ptrace_entry, &new_parent->ptraced); 411da177e4SLinus Torvalds child->parent = new_parent; 421da177e4SLinus Torvalds } 431da177e4SLinus Torvalds 44e3bd058fSTejun Heo /** 45e3bd058fSTejun Heo * __ptrace_unlink - unlink ptracee and restore its execution state 46e3bd058fSTejun Heo * @child: ptracee to be unlinked 471da177e4SLinus Torvalds * 480e9f0a4aSTejun Heo * Remove @child from the ptrace list, move it back to the original parent, 490e9f0a4aSTejun Heo * and restore the execution state so that it conforms to the group stop 500e9f0a4aSTejun Heo * state. 510e9f0a4aSTejun Heo * 520e9f0a4aSTejun Heo * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer 530e9f0a4aSTejun Heo * exiting. For PTRACE_DETACH, unless the ptracee has been killed between 540e9f0a4aSTejun Heo * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED. 550e9f0a4aSTejun Heo * If the ptracer is exiting, the ptracee can be in any state. 560e9f0a4aSTejun Heo * 570e9f0a4aSTejun Heo * After detach, the ptracee should be in a state which conforms to the 580e9f0a4aSTejun Heo * group stop. If the group is stopped or in the process of stopping, the 590e9f0a4aSTejun Heo * ptracee should be put into TASK_STOPPED; otherwise, it should be woken 600e9f0a4aSTejun Heo * up from TASK_TRACED. 610e9f0a4aSTejun Heo * 620e9f0a4aSTejun Heo * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED, 630e9f0a4aSTejun Heo * it goes through TRACED -> RUNNING -> STOPPED transition which is similar 640e9f0a4aSTejun Heo * to but in the opposite direction of what happens while attaching to a 650e9f0a4aSTejun Heo * stopped task. However, in this direction, the intermediate RUNNING 660e9f0a4aSTejun Heo * state is not hidden even from the current ptracer and if it immediately 670e9f0a4aSTejun Heo * re-attaches and performs a WNOHANG wait(2), it may fail. 68e3bd058fSTejun Heo * 69e3bd058fSTejun Heo * CONTEXT: 70e3bd058fSTejun Heo * write_lock_irq(tasklist_lock) 711da177e4SLinus Torvalds */ 7236c8b586SIngo Molnar void __ptrace_unlink(struct task_struct *child) 731da177e4SLinus Torvalds { 745ecfbae0SOleg Nesterov BUG_ON(!child->ptrace); 755ecfbae0SOleg Nesterov 761da177e4SLinus Torvalds child->ptrace = 0; 771da177e4SLinus Torvalds child->parent = child->real_parent; 78f470021aSRoland McGrath list_del_init(&child->ptrace_entry); 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds spin_lock(&child->sighand->siglock); 810e9f0a4aSTejun Heo 821da177e4SLinus Torvalds /* 8373ddff2bSTejun Heo * Clear all pending traps and TRAPPING. TRAPPING should be 8473ddff2bSTejun Heo * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly. 8573ddff2bSTejun Heo */ 8673ddff2bSTejun Heo task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK); 8773ddff2bSTejun Heo task_clear_jobctl_trapping(child); 8873ddff2bSTejun Heo 8973ddff2bSTejun Heo /* 90a8f072c1STejun Heo * Reinstate JOBCTL_STOP_PENDING if group stop is in effect and 910e9f0a4aSTejun Heo * @child isn't dead. 921da177e4SLinus Torvalds */ 930e9f0a4aSTejun Heo if (!(child->flags & PF_EXITING) && 940e9f0a4aSTejun Heo (child->signal->flags & SIGNAL_STOP_STOPPED || 958a88951bSOleg Nesterov child->signal->group_stop_count)) { 96a8f072c1STejun Heo child->jobctl |= JOBCTL_STOP_PENDING; 970e9f0a4aSTejun Heo 980e9f0a4aSTejun Heo /* 998a88951bSOleg Nesterov * This is only possible if this thread was cloned by the 1008a88951bSOleg Nesterov * traced task running in the stopped group, set the signal 1018a88951bSOleg Nesterov * for the future reports. 1028a88951bSOleg Nesterov * FIXME: we should change ptrace_init_task() to handle this 1038a88951bSOleg Nesterov * case. 1048a88951bSOleg Nesterov */ 1058a88951bSOleg Nesterov if (!(child->jobctl & JOBCTL_STOP_SIGMASK)) 1068a88951bSOleg Nesterov child->jobctl |= SIGSTOP; 1078a88951bSOleg Nesterov } 1088a88951bSOleg Nesterov 1098a88951bSOleg Nesterov /* 1100e9f0a4aSTejun Heo * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick 1110e9f0a4aSTejun Heo * @child in the butt. Note that @resume should be used iff @child 1120e9f0a4aSTejun Heo * is in TASK_TRACED; otherwise, we might unduly disrupt 1130e9f0a4aSTejun Heo * TASK_KILLABLE sleeps. 1140e9f0a4aSTejun Heo */ 115a8f072c1STejun Heo if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child)) 116910ffdb1SOleg Nesterov ptrace_signal_wake_up(child, true); 1170e9f0a4aSTejun Heo 1181da177e4SLinus Torvalds spin_unlock(&child->sighand->siglock); 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1219899d11fSOleg Nesterov /* Ensure that nothing can wake it up, even SIGKILL */ 1229899d11fSOleg Nesterov static bool ptrace_freeze_traced(struct task_struct *task) 1239899d11fSOleg Nesterov { 1249899d11fSOleg Nesterov bool ret = false; 1259899d11fSOleg Nesterov 1269899d11fSOleg Nesterov /* Lockless, nobody but us can set this flag */ 1279899d11fSOleg Nesterov if (task->jobctl & JOBCTL_LISTENING) 1289899d11fSOleg Nesterov return ret; 1299899d11fSOleg Nesterov 1309899d11fSOleg Nesterov spin_lock_irq(&task->sighand->siglock); 1319899d11fSOleg Nesterov if (task_is_traced(task) && !__fatal_signal_pending(task)) { 1329899d11fSOleg Nesterov task->state = __TASK_TRACED; 1339899d11fSOleg Nesterov ret = true; 1349899d11fSOleg Nesterov } 1359899d11fSOleg Nesterov spin_unlock_irq(&task->sighand->siglock); 1369899d11fSOleg Nesterov 1379899d11fSOleg Nesterov return ret; 1389899d11fSOleg Nesterov } 1399899d11fSOleg Nesterov 1409899d11fSOleg Nesterov static void ptrace_unfreeze_traced(struct task_struct *task) 1419899d11fSOleg Nesterov { 1429899d11fSOleg Nesterov if (task->state != __TASK_TRACED) 1439899d11fSOleg Nesterov return; 1449899d11fSOleg Nesterov 1459899d11fSOleg Nesterov WARN_ON(!task->ptrace || task->parent != current); 1469899d11fSOleg Nesterov 1479899d11fSOleg Nesterov spin_lock_irq(&task->sighand->siglock); 1489899d11fSOleg Nesterov if (__fatal_signal_pending(task)) 1499899d11fSOleg Nesterov wake_up_state(task, __TASK_TRACED); 1509899d11fSOleg Nesterov else 1519899d11fSOleg Nesterov task->state = TASK_TRACED; 1529899d11fSOleg Nesterov spin_unlock_irq(&task->sighand->siglock); 1539899d11fSOleg Nesterov } 1549899d11fSOleg Nesterov 155755e276bSTejun Heo /** 156755e276bSTejun Heo * ptrace_check_attach - check whether ptracee is ready for ptrace operation 157755e276bSTejun Heo * @child: ptracee to check for 158755e276bSTejun Heo * @ignore_state: don't check whether @child is currently %TASK_TRACED 159755e276bSTejun Heo * 160755e276bSTejun Heo * Check whether @child is being ptraced by %current and ready for further 161755e276bSTejun Heo * ptrace operations. If @ignore_state is %false, @child also should be in 162755e276bSTejun Heo * %TASK_TRACED state and on return the child is guaranteed to be traced 163755e276bSTejun Heo * and not executing. If @ignore_state is %true, @child can be in any 164755e276bSTejun Heo * state. 165755e276bSTejun Heo * 166755e276bSTejun Heo * CONTEXT: 167755e276bSTejun Heo * Grabs and releases tasklist_lock and @child->sighand->siglock. 168755e276bSTejun Heo * 169755e276bSTejun Heo * RETURNS: 170755e276bSTejun Heo * 0 on success, -ESRCH if %child is not ready. 1711da177e4SLinus Torvalds */ 172edea0d03SOleg Nesterov static int ptrace_check_attach(struct task_struct *child, bool ignore_state) 1731da177e4SLinus Torvalds { 1741da177e4SLinus Torvalds int ret = -ESRCH; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* 1771da177e4SLinus Torvalds * We take the read lock around doing both checks to close a 1781da177e4SLinus Torvalds * possible race where someone else was tracing our child and 1791da177e4SLinus Torvalds * detached between these two checks. After this locked check, 1801da177e4SLinus Torvalds * we are sure that this is our traced child and that can only 1811da177e4SLinus Torvalds * be changed by us so it's not changing right after this. 1821da177e4SLinus Torvalds */ 1831da177e4SLinus Torvalds read_lock(&tasklist_lock); 1849899d11fSOleg Nesterov if (child->ptrace && child->parent == current) { 1859899d11fSOleg Nesterov WARN_ON(child->state == __TASK_TRACED); 186c0c0b649SOleg Nesterov /* 187c0c0b649SOleg Nesterov * child->sighand can't be NULL, release_task() 188c0c0b649SOleg Nesterov * does ptrace_unlink() before __exit_signal(). 189c0c0b649SOleg Nesterov */ 1909899d11fSOleg Nesterov if (ignore_state || ptrace_freeze_traced(child)) 191321fb561SOleg Nesterov ret = 0; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds read_unlock(&tasklist_lock); 1941da177e4SLinus Torvalds 1959899d11fSOleg Nesterov if (!ret && !ignore_state) { 1969899d11fSOleg Nesterov if (!wait_task_inactive(child, __TASK_TRACED)) { 1979899d11fSOleg Nesterov /* 1989899d11fSOleg Nesterov * This can only happen if may_ptrace_stop() fails and 1999899d11fSOleg Nesterov * ptrace_stop() changes ->state back to TASK_RUNNING, 2009899d11fSOleg Nesterov * so we should not worry about leaking __TASK_TRACED. 2019899d11fSOleg Nesterov */ 2029899d11fSOleg Nesterov WARN_ON(child->state == __TASK_TRACED); 2039899d11fSOleg Nesterov ret = -ESRCH; 2049899d11fSOleg Nesterov } 2059899d11fSOleg Nesterov } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds return ret; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 21069f594a3SEric Paris static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode) 21169f594a3SEric Paris { 21269f594a3SEric Paris if (mode & PTRACE_MODE_NOAUDIT) 21369f594a3SEric Paris return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE); 21469f594a3SEric Paris else 21569f594a3SEric Paris return has_ns_capability(current, ns, CAP_SYS_PTRACE); 21669f594a3SEric Paris } 21769f594a3SEric Paris 2189f99798fSTetsuo Handa /* Returns 0 on success, -errno on denial. */ 2199f99798fSTetsuo Handa static int __ptrace_may_access(struct task_struct *task, unsigned int mode) 220ab8d11beSMiklos Szeredi { 221c69e8d9cSDavid Howells const struct cred *cred = current_cred(), *tcred; 222b6dff3ecSDavid Howells 223df26c40eSEric W. Biederman /* May we inspect the given task? 224df26c40eSEric W. Biederman * This check is used both for attaching with ptrace 225df26c40eSEric W. Biederman * and for allowing access to sensitive information in /proc. 226df26c40eSEric W. Biederman * 227df26c40eSEric W. Biederman * ptrace_attach denies several cases that /proc allows 228df26c40eSEric W. Biederman * because setting up the necessary parent/child relationship 229df26c40eSEric W. Biederman * or halting the specified task is impossible. 230df26c40eSEric W. Biederman */ 231df26c40eSEric W. Biederman int dumpable = 0; 232df26c40eSEric W. Biederman /* Don't let security modules deny introspection */ 23373af963fSMark Grondona if (same_thread_group(task, current)) 234df26c40eSEric W. Biederman return 0; 235c69e8d9cSDavid Howells rcu_read_lock(); 236c69e8d9cSDavid Howells tcred = __task_cred(task); 2375af66203SEric W. Biederman if (uid_eq(cred->uid, tcred->euid) && 2385af66203SEric W. Biederman uid_eq(cred->uid, tcred->suid) && 2395af66203SEric W. Biederman uid_eq(cred->uid, tcred->uid) && 2405af66203SEric W. Biederman gid_eq(cred->gid, tcred->egid) && 2415af66203SEric W. Biederman gid_eq(cred->gid, tcred->sgid) && 2425af66203SEric W. Biederman gid_eq(cred->gid, tcred->gid)) 2438409cca7SSerge E. Hallyn goto ok; 244c4a4d603SEric W. Biederman if (ptrace_has_cap(tcred->user_ns, mode)) 2458409cca7SSerge E. Hallyn goto ok; 246c69e8d9cSDavid Howells rcu_read_unlock(); 247ab8d11beSMiklos Szeredi return -EPERM; 2488409cca7SSerge E. Hallyn ok: 249c69e8d9cSDavid Howells rcu_read_unlock(); 250ab8d11beSMiklos Szeredi smp_rmb(); 251df26c40eSEric W. Biederman if (task->mm) 2526c5d5238SKawai, Hidehiro dumpable = get_dumpable(task->mm); 2534c44aaafSEric W. Biederman rcu_read_lock(); 254d049f74fSKees Cook if (dumpable != SUID_DUMP_USER && 255d049f74fSKees Cook !ptrace_has_cap(__task_cred(task)->user_ns, mode)) { 2564c44aaafSEric W. Biederman rcu_read_unlock(); 257ab8d11beSMiklos Szeredi return -EPERM; 2584c44aaafSEric W. Biederman } 2594c44aaafSEric W. Biederman rcu_read_unlock(); 260ab8d11beSMiklos Szeredi 2619e48858fSIngo Molnar return security_ptrace_access_check(task, mode); 262ab8d11beSMiklos Szeredi } 263ab8d11beSMiklos Szeredi 264006ebb40SStephen Smalley bool ptrace_may_access(struct task_struct *task, unsigned int mode) 265ab8d11beSMiklos Szeredi { 266ab8d11beSMiklos Szeredi int err; 267ab8d11beSMiklos Szeredi task_lock(task); 268006ebb40SStephen Smalley err = __ptrace_may_access(task, mode); 269ab8d11beSMiklos Szeredi task_unlock(task); 2703a709703SRoland McGrath return !err; 271ab8d11beSMiklos Szeredi } 272ab8d11beSMiklos Szeredi 2733544d72aSTejun Heo static int ptrace_attach(struct task_struct *task, long request, 274aa9147c9SDenys Vlasenko unsigned long addr, 2753544d72aSTejun Heo unsigned long flags) 2761da177e4SLinus Torvalds { 2773544d72aSTejun Heo bool seize = (request == PTRACE_SEIZE); 2781da177e4SLinus Torvalds int retval; 279f5b40e36SLinus Torvalds 2803544d72aSTejun Heo retval = -EIO; 281aa9147c9SDenys Vlasenko if (seize) { 282aa9147c9SDenys Vlasenko if (addr != 0) 2833544d72aSTejun Heo goto out; 284aa9147c9SDenys Vlasenko if (flags & ~(unsigned long)PTRACE_O_MASK) 285aa9147c9SDenys Vlasenko goto out; 286aa9147c9SDenys Vlasenko flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT); 287aa9147c9SDenys Vlasenko } else { 288aa9147c9SDenys Vlasenko flags = PT_PTRACED; 289aa9147c9SDenys Vlasenko } 2903544d72aSTejun Heo 291a5cb013dSAl Viro audit_ptrace(task); 292a5cb013dSAl Viro 2931da177e4SLinus Torvalds retval = -EPERM; 294b79b7ba9SOleg Nesterov if (unlikely(task->flags & PF_KTHREAD)) 295b79b7ba9SOleg Nesterov goto out; 296bac0abd6SPavel Emelyanov if (same_thread_group(task, current)) 297f5b40e36SLinus Torvalds goto out; 298f5b40e36SLinus Torvalds 299f2f0b00aSOleg Nesterov /* 300f2f0b00aSOleg Nesterov * Protect exec's credential calculations against our interference; 30186b6c1f3SDenys Vlasenko * SUID, SGID and LSM creds get determined differently 3025e751e99SDavid Howells * under ptrace. 303d84f4f99SDavid Howells */ 304793285fcSOleg Nesterov retval = -ERESTARTNOINTR; 3059b1bf12dSKOSAKI Motohiro if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) 306d84f4f99SDavid Howells goto out; 3074b105cbbSOleg Nesterov 308f5b40e36SLinus Torvalds task_lock(task); 309006ebb40SStephen Smalley retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); 3104b105cbbSOleg Nesterov task_unlock(task); 3111da177e4SLinus Torvalds if (retval) 3124b105cbbSOleg Nesterov goto unlock_creds; 3131da177e4SLinus Torvalds 3144b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 315b79b7ba9SOleg Nesterov retval = -EPERM; 316b79b7ba9SOleg Nesterov if (unlikely(task->exit_state)) 3174b105cbbSOleg Nesterov goto unlock_tasklist; 318f2f0b00aSOleg Nesterov if (task->ptrace) 3194b105cbbSOleg Nesterov goto unlock_tasklist; 320b79b7ba9SOleg Nesterov 3213544d72aSTejun Heo if (seize) 322aa9147c9SDenys Vlasenko flags |= PT_SEIZED; 3234c44aaafSEric W. Biederman rcu_read_lock(); 3244c44aaafSEric W. Biederman if (ns_capable(__task_cred(task)->user_ns, CAP_SYS_PTRACE)) 325aa9147c9SDenys Vlasenko flags |= PT_PTRACE_CAP; 3264c44aaafSEric W. Biederman rcu_read_unlock(); 327aa9147c9SDenys Vlasenko task->ptrace = flags; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds __ptrace_link(task, current); 3303544d72aSTejun Heo 3313544d72aSTejun Heo /* SEIZE doesn't trap tracee on attach */ 3323544d72aSTejun Heo if (!seize) 33333e9fc7dSOleg Nesterov send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); 334b79b7ba9SOleg Nesterov 335d79fdd6dSTejun Heo spin_lock(&task->sighand->siglock); 336d79fdd6dSTejun Heo 337d79fdd6dSTejun Heo /* 33873ddff2bSTejun Heo * If the task is already STOPPED, set JOBCTL_TRAP_STOP and 339d79fdd6dSTejun Heo * TRAPPING, and kick it so that it transits to TRACED. TRAPPING 340d79fdd6dSTejun Heo * will be cleared if the child completes the transition or any 341d79fdd6dSTejun Heo * event which clears the group stop states happens. We'll wait 342d79fdd6dSTejun Heo * for the transition to complete before returning from this 343d79fdd6dSTejun Heo * function. 344d79fdd6dSTejun Heo * 345d79fdd6dSTejun Heo * This hides STOPPED -> RUNNING -> TRACED transition from the 346d79fdd6dSTejun Heo * attaching thread but a different thread in the same group can 347d79fdd6dSTejun Heo * still observe the transient RUNNING state. IOW, if another 348d79fdd6dSTejun Heo * thread's WNOHANG wait(2) on the stopped tracee races against 349d79fdd6dSTejun Heo * ATTACH, the wait(2) may fail due to the transient RUNNING. 350d79fdd6dSTejun Heo * 351d79fdd6dSTejun Heo * The following task_is_stopped() test is safe as both transitions 352d79fdd6dSTejun Heo * in and out of STOPPED are protected by siglock. 353d79fdd6dSTejun Heo */ 3547dd3db54STejun Heo if (task_is_stopped(task) && 35573ddff2bSTejun Heo task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) 356910ffdb1SOleg Nesterov signal_wake_up_state(task, __TASK_STOPPED); 357d79fdd6dSTejun Heo 358d79fdd6dSTejun Heo spin_unlock(&task->sighand->siglock); 359d79fdd6dSTejun Heo 360b79b7ba9SOleg Nesterov retval = 0; 3614b105cbbSOleg Nesterov unlock_tasklist: 3624b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 3634b105cbbSOleg Nesterov unlock_creds: 3649b1bf12dSKOSAKI Motohiro mutex_unlock(&task->signal->cred_guard_mutex); 365f5b40e36SLinus Torvalds out: 366f701e5b7SVladimir Zapolskiy if (!retval) { 36762c124ffSTejun Heo wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, 36874316201SNeilBrown TASK_UNINTERRUPTIBLE); 369f701e5b7SVladimir Zapolskiy proc_ptrace_connector(task, PTRACE_ATTACH); 370f701e5b7SVladimir Zapolskiy } 371f701e5b7SVladimir Zapolskiy 3721da177e4SLinus Torvalds return retval; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 375f2f0b00aSOleg Nesterov /** 376f2f0b00aSOleg Nesterov * ptrace_traceme -- helper for PTRACE_TRACEME 377f2f0b00aSOleg Nesterov * 378f2f0b00aSOleg Nesterov * Performs checks and sets PT_PTRACED. 379f2f0b00aSOleg Nesterov * Should be used by all ptrace implementations for PTRACE_TRACEME. 380f2f0b00aSOleg Nesterov */ 381e3e89cc5SLinus Torvalds static int ptrace_traceme(void) 382f2f0b00aSOleg Nesterov { 383f2f0b00aSOleg Nesterov int ret = -EPERM; 384f2f0b00aSOleg Nesterov 3854b105cbbSOleg Nesterov write_lock_irq(&tasklist_lock); 3864b105cbbSOleg Nesterov /* Are we already being traced? */ 387f2f0b00aSOleg Nesterov if (!current->ptrace) { 388f2f0b00aSOleg Nesterov ret = security_ptrace_traceme(current->parent); 389f2f0b00aSOleg Nesterov /* 390f2f0b00aSOleg Nesterov * Check PF_EXITING to ensure ->real_parent has not passed 391f2f0b00aSOleg Nesterov * exit_ptrace(). Otherwise we don't report the error but 392f2f0b00aSOleg Nesterov * pretend ->real_parent untraces us right after return. 393f2f0b00aSOleg Nesterov */ 394f2f0b00aSOleg Nesterov if (!ret && !(current->real_parent->flags & PF_EXITING)) { 395f2f0b00aSOleg Nesterov current->ptrace = PT_PTRACED; 396f2f0b00aSOleg Nesterov __ptrace_link(current, current->real_parent); 397f2f0b00aSOleg Nesterov } 398f2f0b00aSOleg Nesterov } 3994b105cbbSOleg Nesterov write_unlock_irq(&tasklist_lock); 4004b105cbbSOleg Nesterov 401f2f0b00aSOleg Nesterov return ret; 402f2f0b00aSOleg Nesterov } 403f2f0b00aSOleg Nesterov 40439c626aeSOleg Nesterov /* 40539c626aeSOleg Nesterov * Called with irqs disabled, returns true if childs should reap themselves. 40639c626aeSOleg Nesterov */ 40739c626aeSOleg Nesterov static int ignoring_children(struct sighand_struct *sigh) 40839c626aeSOleg Nesterov { 40939c626aeSOleg Nesterov int ret; 41039c626aeSOleg Nesterov spin_lock(&sigh->siglock); 41139c626aeSOleg Nesterov ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || 41239c626aeSOleg Nesterov (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); 41339c626aeSOleg Nesterov spin_unlock(&sigh->siglock); 41439c626aeSOleg Nesterov return ret; 41539c626aeSOleg Nesterov } 41639c626aeSOleg Nesterov 41739c626aeSOleg Nesterov /* 41839c626aeSOleg Nesterov * Called with tasklist_lock held for writing. 41939c626aeSOleg Nesterov * Unlink a traced task, and clean it up if it was a traced zombie. 42039c626aeSOleg Nesterov * Return true if it needs to be reaped with release_task(). 42139c626aeSOleg Nesterov * (We can't call release_task() here because we already hold tasklist_lock.) 42239c626aeSOleg Nesterov * 42339c626aeSOleg Nesterov * If it's a zombie, our attachedness prevented normal parent notification 42439c626aeSOleg Nesterov * or self-reaping. Do notification now if it would have happened earlier. 42539c626aeSOleg Nesterov * If it should reap itself, return true. 42639c626aeSOleg Nesterov * 427a7f0765eSOleg Nesterov * If it's our own child, there is no notification to do. But if our normal 428a7f0765eSOleg Nesterov * children self-reap, then this child was prevented by ptrace and we must 429a7f0765eSOleg Nesterov * reap it now, in that case we must also wake up sub-threads sleeping in 430a7f0765eSOleg Nesterov * do_wait(). 43139c626aeSOleg Nesterov */ 43239c626aeSOleg Nesterov static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) 43339c626aeSOleg Nesterov { 4349843a1e9SOleg Nesterov bool dead; 4359843a1e9SOleg Nesterov 43639c626aeSOleg Nesterov __ptrace_unlink(p); 43739c626aeSOleg Nesterov 4389843a1e9SOleg Nesterov if (p->exit_state != EXIT_ZOMBIE) 4399843a1e9SOleg Nesterov return false; 4409843a1e9SOleg Nesterov 4419843a1e9SOleg Nesterov dead = !thread_group_leader(p); 4429843a1e9SOleg Nesterov 4439843a1e9SOleg Nesterov if (!dead && thread_group_empty(p)) { 44439c626aeSOleg Nesterov if (!same_thread_group(p->real_parent, tracer)) 4459843a1e9SOleg Nesterov dead = do_notify_parent(p, p->exit_signal); 446a7f0765eSOleg Nesterov else if (ignoring_children(tracer->sighand)) { 447a7f0765eSOleg Nesterov __wake_up_parent(p, tracer); 4489843a1e9SOleg Nesterov dead = true; 44939c626aeSOleg Nesterov } 450a7f0765eSOleg Nesterov } 45139c626aeSOleg Nesterov /* Mark it as in the process of being reaped. */ 4529843a1e9SOleg Nesterov if (dead) 45339c626aeSOleg Nesterov p->exit_state = EXIT_DEAD; 4549843a1e9SOleg Nesterov return dead; 45539c626aeSOleg Nesterov } 45639c626aeSOleg Nesterov 457e3e89cc5SLinus Torvalds static int ptrace_detach(struct task_struct *child, unsigned int data) 4581da177e4SLinus Torvalds { 4597ed20e1aSJesper Juhl if (!valid_signal(data)) 4601da177e4SLinus Torvalds return -EIO; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* Architecture-specific hardware disable .. */ 4631da177e4SLinus Torvalds ptrace_disable(child); 4647d941432SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 4651da177e4SLinus Torvalds 46695c3eb76SOleg Nesterov write_lock_irq(&tasklist_lock); 46739c626aeSOleg Nesterov /* 46864a4096cSOleg Nesterov * We rely on ptrace_freeze_traced(). It can't be killed and 46964a4096cSOleg Nesterov * untraced by another thread, it can't be a zombie. 47039c626aeSOleg Nesterov */ 47164a4096cSOleg Nesterov WARN_ON(!child->ptrace || child->exit_state); 47264a4096cSOleg Nesterov /* 47364a4096cSOleg Nesterov * tasklist_lock avoids the race with wait_task_stopped(), see 47464a4096cSOleg Nesterov * the comment in ptrace_resume(). 47564a4096cSOleg Nesterov */ 47695c3eb76SOleg Nesterov child->exit_code = data; 47764a4096cSOleg Nesterov __ptrace_detach(current, child); 4781da177e4SLinus Torvalds write_unlock_irq(&tasklist_lock); 4791da177e4SLinus Torvalds 480f701e5b7SVladimir Zapolskiy proc_ptrace_connector(child, PTRACE_DETACH); 4814576145cSOleg Nesterov 4821da177e4SLinus Torvalds return 0; 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 48539c626aeSOleg Nesterov /* 486c7e49c14SOleg Nesterov * Detach all tasks we were using ptrace on. Called with tasklist held 4877c8bd232SOleg Nesterov * for writing. 48839c626aeSOleg Nesterov */ 4897c8bd232SOleg Nesterov void exit_ptrace(struct task_struct *tracer, struct list_head *dead) 49039c626aeSOleg Nesterov { 49139c626aeSOleg Nesterov struct task_struct *p, *n; 492c7e49c14SOleg Nesterov 49339c626aeSOleg Nesterov list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { 494992fb6e1SOleg Nesterov if (unlikely(p->ptrace & PT_EXITKILL)) 495992fb6e1SOleg Nesterov send_sig_info(SIGKILL, SEND_SIG_FORCED, p); 496992fb6e1SOleg Nesterov 49739c626aeSOleg Nesterov if (__ptrace_detach(tracer, p)) 4987c8bd232SOleg Nesterov list_add(&p->ptrace_entry, dead); 49939c626aeSOleg Nesterov } 50039c626aeSOleg Nesterov } 50139c626aeSOleg Nesterov 5021da177e4SLinus Torvalds int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) 5031da177e4SLinus Torvalds { 5041da177e4SLinus Torvalds int copied = 0; 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds while (len > 0) { 5071da177e4SLinus Torvalds char buf[128]; 5081da177e4SLinus Torvalds int this_len, retval; 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 5111da177e4SLinus Torvalds retval = access_process_vm(tsk, src, buf, this_len, 0); 5121da177e4SLinus Torvalds if (!retval) { 5131da177e4SLinus Torvalds if (copied) 5141da177e4SLinus Torvalds break; 5151da177e4SLinus Torvalds return -EIO; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds if (copy_to_user(dst, buf, retval)) 5181da177e4SLinus Torvalds return -EFAULT; 5191da177e4SLinus Torvalds copied += retval; 5201da177e4SLinus Torvalds src += retval; 5211da177e4SLinus Torvalds dst += retval; 5221da177e4SLinus Torvalds len -= retval; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds return copied; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) 5281da177e4SLinus Torvalds { 5291da177e4SLinus Torvalds int copied = 0; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds while (len > 0) { 5321da177e4SLinus Torvalds char buf[128]; 5331da177e4SLinus Torvalds int this_len, retval; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds this_len = (len > sizeof(buf)) ? sizeof(buf) : len; 5361da177e4SLinus Torvalds if (copy_from_user(buf, src, this_len)) 5371da177e4SLinus Torvalds return -EFAULT; 5381da177e4SLinus Torvalds retval = access_process_vm(tsk, dst, buf, this_len, 1); 5391da177e4SLinus Torvalds if (!retval) { 5401da177e4SLinus Torvalds if (copied) 5411da177e4SLinus Torvalds break; 5421da177e4SLinus Torvalds return -EIO; 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds copied += retval; 5451da177e4SLinus Torvalds src += retval; 5461da177e4SLinus Torvalds dst += retval; 5471da177e4SLinus Torvalds len -= retval; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds return copied; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds 5524abf9869SNamhyung Kim static int ptrace_setoptions(struct task_struct *child, unsigned long data) 5531da177e4SLinus Torvalds { 55486b6c1f3SDenys Vlasenko unsigned flags; 55586b6c1f3SDenys Vlasenko 5568c5cf9e5SDenys Vlasenko if (data & ~(unsigned long)PTRACE_O_MASK) 5578c5cf9e5SDenys Vlasenko return -EINVAL; 5588c5cf9e5SDenys Vlasenko 55913c4a901STycho Andersen if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) { 56013c4a901STycho Andersen if (!config_enabled(CONFIG_CHECKPOINT_RESTORE) || 56113c4a901STycho Andersen !config_enabled(CONFIG_SECCOMP)) 56213c4a901STycho Andersen return -EINVAL; 56313c4a901STycho Andersen 56413c4a901STycho Andersen if (!capable(CAP_SYS_ADMIN)) 56513c4a901STycho Andersen return -EPERM; 56613c4a901STycho Andersen 56713c4a901STycho Andersen if (seccomp_mode(¤t->seccomp) != SECCOMP_MODE_DISABLED || 56813c4a901STycho Andersen current->ptrace & PT_SUSPEND_SECCOMP) 56913c4a901STycho Andersen return -EPERM; 57013c4a901STycho Andersen } 57113c4a901STycho Andersen 57286b6c1f3SDenys Vlasenko /* Avoid intermediate state when all opts are cleared */ 57386b6c1f3SDenys Vlasenko flags = child->ptrace; 57486b6c1f3SDenys Vlasenko flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT); 57586b6c1f3SDenys Vlasenko flags |= (data << PT_OPT_FLAG_SHIFT); 57686b6c1f3SDenys Vlasenko child->ptrace = flags; 5771da177e4SLinus Torvalds 5788c5cf9e5SDenys Vlasenko return 0; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 581e16b2781SRoland McGrath static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) 5821da177e4SLinus Torvalds { 583e4961254SOleg Nesterov unsigned long flags; 5841da177e4SLinus Torvalds int error = -ESRCH; 5851da177e4SLinus Torvalds 586e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 5871da177e4SLinus Torvalds error = -EINVAL; 5881da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 589e16b2781SRoland McGrath *info = *child->last_siginfo; 5901da177e4SLinus Torvalds error = 0; 5911da177e4SLinus Torvalds } 592e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds return error; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 597e16b2781SRoland McGrath static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) 5981da177e4SLinus Torvalds { 599e4961254SOleg Nesterov unsigned long flags; 6001da177e4SLinus Torvalds int error = -ESRCH; 6011da177e4SLinus Torvalds 602e4961254SOleg Nesterov if (lock_task_sighand(child, &flags)) { 6031da177e4SLinus Torvalds error = -EINVAL; 6041da177e4SLinus Torvalds if (likely(child->last_siginfo != NULL)) { 605e16b2781SRoland McGrath *child->last_siginfo = *info; 6061da177e4SLinus Torvalds error = 0; 6071da177e4SLinus Torvalds } 608e4961254SOleg Nesterov unlock_task_sighand(child, &flags); 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds return error; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 61384c751bdSAndrey Vagin static int ptrace_peek_siginfo(struct task_struct *child, 61484c751bdSAndrey Vagin unsigned long addr, 61584c751bdSAndrey Vagin unsigned long data) 61684c751bdSAndrey Vagin { 61784c751bdSAndrey Vagin struct ptrace_peeksiginfo_args arg; 61884c751bdSAndrey Vagin struct sigpending *pending; 61984c751bdSAndrey Vagin struct sigqueue *q; 62084c751bdSAndrey Vagin int ret, i; 62184c751bdSAndrey Vagin 62284c751bdSAndrey Vagin ret = copy_from_user(&arg, (void __user *) addr, 62384c751bdSAndrey Vagin sizeof(struct ptrace_peeksiginfo_args)); 62484c751bdSAndrey Vagin if (ret) 62584c751bdSAndrey Vagin return -EFAULT; 62684c751bdSAndrey Vagin 62784c751bdSAndrey Vagin if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED) 62884c751bdSAndrey Vagin return -EINVAL; /* unknown flags */ 62984c751bdSAndrey Vagin 63084c751bdSAndrey Vagin if (arg.nr < 0) 63184c751bdSAndrey Vagin return -EINVAL; 63284c751bdSAndrey Vagin 63384c751bdSAndrey Vagin if (arg.flags & PTRACE_PEEKSIGINFO_SHARED) 63484c751bdSAndrey Vagin pending = &child->signal->shared_pending; 63584c751bdSAndrey Vagin else 63684c751bdSAndrey Vagin pending = &child->pending; 63784c751bdSAndrey Vagin 63884c751bdSAndrey Vagin for (i = 0; i < arg.nr; ) { 63984c751bdSAndrey Vagin siginfo_t info; 64084c751bdSAndrey Vagin s32 off = arg.off + i; 64184c751bdSAndrey Vagin 64284c751bdSAndrey Vagin spin_lock_irq(&child->sighand->siglock); 64384c751bdSAndrey Vagin list_for_each_entry(q, &pending->list, list) { 64484c751bdSAndrey Vagin if (!off--) { 64584c751bdSAndrey Vagin copy_siginfo(&info, &q->info); 64684c751bdSAndrey Vagin break; 64784c751bdSAndrey Vagin } 64884c751bdSAndrey Vagin } 64984c751bdSAndrey Vagin spin_unlock_irq(&child->sighand->siglock); 65084c751bdSAndrey Vagin 65184c751bdSAndrey Vagin if (off >= 0) /* beyond the end of the list */ 65284c751bdSAndrey Vagin break; 65384c751bdSAndrey Vagin 65484c751bdSAndrey Vagin #ifdef CONFIG_COMPAT 65584c751bdSAndrey Vagin if (unlikely(is_compat_task())) { 65684c751bdSAndrey Vagin compat_siginfo_t __user *uinfo = compat_ptr(data); 65784c751bdSAndrey Vagin 658706b23bdSMathieu Desnoyers if (copy_siginfo_to_user32(uinfo, &info) || 659706b23bdSMathieu Desnoyers __put_user(info.si_code, &uinfo->si_code)) { 660706b23bdSMathieu Desnoyers ret = -EFAULT; 661706b23bdSMathieu Desnoyers break; 662706b23bdSMathieu Desnoyers } 663706b23bdSMathieu Desnoyers 66484c751bdSAndrey Vagin } else 66584c751bdSAndrey Vagin #endif 66684c751bdSAndrey Vagin { 66784c751bdSAndrey Vagin siginfo_t __user *uinfo = (siginfo_t __user *) data; 66884c751bdSAndrey Vagin 669706b23bdSMathieu Desnoyers if (copy_siginfo_to_user(uinfo, &info) || 670706b23bdSMathieu Desnoyers __put_user(info.si_code, &uinfo->si_code)) { 67184c751bdSAndrey Vagin ret = -EFAULT; 67284c751bdSAndrey Vagin break; 67384c751bdSAndrey Vagin } 674706b23bdSMathieu Desnoyers } 67584c751bdSAndrey Vagin 67684c751bdSAndrey Vagin data += sizeof(siginfo_t); 67784c751bdSAndrey Vagin i++; 67884c751bdSAndrey Vagin 67984c751bdSAndrey Vagin if (signal_pending(current)) 68084c751bdSAndrey Vagin break; 68184c751bdSAndrey Vagin 68284c751bdSAndrey Vagin cond_resched(); 68384c751bdSAndrey Vagin } 68484c751bdSAndrey Vagin 68584c751bdSAndrey Vagin if (i > 0) 68684c751bdSAndrey Vagin return i; 68784c751bdSAndrey Vagin 68884c751bdSAndrey Vagin return ret; 68984c751bdSAndrey Vagin } 69036df29d7SRoland McGrath 69136df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 69236df29d7SRoland McGrath #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) 69336df29d7SRoland McGrath #else 69436df29d7SRoland McGrath #define is_singlestep(request) 0 69536df29d7SRoland McGrath #endif 69636df29d7SRoland McGrath 6975b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 6985b88abbfSRoland McGrath #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) 6995b88abbfSRoland McGrath #else 7005b88abbfSRoland McGrath #define is_singleblock(request) 0 7015b88abbfSRoland McGrath #endif 7025b88abbfSRoland McGrath 70336df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 70436df29d7SRoland McGrath #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) 70536df29d7SRoland McGrath #else 70636df29d7SRoland McGrath #define is_sysemu_singlestep(request) 0 70736df29d7SRoland McGrath #endif 70836df29d7SRoland McGrath 7094abf9869SNamhyung Kim static int ptrace_resume(struct task_struct *child, long request, 7104abf9869SNamhyung Kim unsigned long data) 71136df29d7SRoland McGrath { 712b72c1869SOleg Nesterov bool need_siglock; 713b72c1869SOleg Nesterov 71436df29d7SRoland McGrath if (!valid_signal(data)) 71536df29d7SRoland McGrath return -EIO; 71636df29d7SRoland McGrath 71736df29d7SRoland McGrath if (request == PTRACE_SYSCALL) 71836df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 71936df29d7SRoland McGrath else 72036df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 72136df29d7SRoland McGrath 72236df29d7SRoland McGrath #ifdef TIF_SYSCALL_EMU 72336df29d7SRoland McGrath if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) 72436df29d7SRoland McGrath set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 72536df29d7SRoland McGrath else 72636df29d7SRoland McGrath clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 72736df29d7SRoland McGrath #endif 72836df29d7SRoland McGrath 7295b88abbfSRoland McGrath if (is_singleblock(request)) { 7305b88abbfSRoland McGrath if (unlikely(!arch_has_block_step())) 7315b88abbfSRoland McGrath return -EIO; 7325b88abbfSRoland McGrath user_enable_block_step(child); 7335b88abbfSRoland McGrath } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { 73436df29d7SRoland McGrath if (unlikely(!arch_has_single_step())) 73536df29d7SRoland McGrath return -EIO; 73636df29d7SRoland McGrath user_enable_single_step(child); 7373a709703SRoland McGrath } else { 73836df29d7SRoland McGrath user_disable_single_step(child); 7393a709703SRoland McGrath } 74036df29d7SRoland McGrath 741b72c1869SOleg Nesterov /* 742b72c1869SOleg Nesterov * Change ->exit_code and ->state under siglock to avoid the race 743b72c1869SOleg Nesterov * with wait_task_stopped() in between; a non-zero ->exit_code will 744b72c1869SOleg Nesterov * wrongly look like another report from tracee. 745b72c1869SOleg Nesterov * 746b72c1869SOleg Nesterov * Note that we need siglock even if ->exit_code == data and/or this 747b72c1869SOleg Nesterov * status was not reported yet, the new status must not be cleared by 748b72c1869SOleg Nesterov * wait_task_stopped() after resume. 749b72c1869SOleg Nesterov * 750b72c1869SOleg Nesterov * If data == 0 we do not care if wait_task_stopped() reports the old 751b72c1869SOleg Nesterov * status and clears the code too; this can't race with the tracee, it 752b72c1869SOleg Nesterov * takes siglock after resume. 753b72c1869SOleg Nesterov */ 754b72c1869SOleg Nesterov need_siglock = data && !thread_group_empty(current); 755b72c1869SOleg Nesterov if (need_siglock) 756b72c1869SOleg Nesterov spin_lock_irq(&child->sighand->siglock); 75736df29d7SRoland McGrath child->exit_code = data; 7580666fb51SOleg Nesterov wake_up_state(child, __TASK_TRACED); 759b72c1869SOleg Nesterov if (need_siglock) 760b72c1869SOleg Nesterov spin_unlock_irq(&child->sighand->siglock); 76136df29d7SRoland McGrath 76236df29d7SRoland McGrath return 0; 76336df29d7SRoland McGrath } 76436df29d7SRoland McGrath 7652225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 7662225a122SSuresh Siddha 7672225a122SSuresh Siddha static const struct user_regset * 7682225a122SSuresh Siddha find_regset(const struct user_regset_view *view, unsigned int type) 7692225a122SSuresh Siddha { 7702225a122SSuresh Siddha const struct user_regset *regset; 7712225a122SSuresh Siddha int n; 7722225a122SSuresh Siddha 7732225a122SSuresh Siddha for (n = 0; n < view->n; ++n) { 7742225a122SSuresh Siddha regset = view->regsets + n; 7752225a122SSuresh Siddha if (regset->core_note_type == type) 7762225a122SSuresh Siddha return regset; 7772225a122SSuresh Siddha } 7782225a122SSuresh Siddha 7792225a122SSuresh Siddha return NULL; 7802225a122SSuresh Siddha } 7812225a122SSuresh Siddha 7822225a122SSuresh Siddha static int ptrace_regset(struct task_struct *task, int req, unsigned int type, 7832225a122SSuresh Siddha struct iovec *kiov) 7842225a122SSuresh Siddha { 7852225a122SSuresh Siddha const struct user_regset_view *view = task_user_regset_view(task); 7862225a122SSuresh Siddha const struct user_regset *regset = find_regset(view, type); 7872225a122SSuresh Siddha int regset_no; 7882225a122SSuresh Siddha 7892225a122SSuresh Siddha if (!regset || (kiov->iov_len % regset->size) != 0) 790c6a0dd7eSSuresh Siddha return -EINVAL; 7912225a122SSuresh Siddha 7922225a122SSuresh Siddha regset_no = regset - view->regsets; 7932225a122SSuresh Siddha kiov->iov_len = min(kiov->iov_len, 7942225a122SSuresh Siddha (__kernel_size_t) (regset->n * regset->size)); 7952225a122SSuresh Siddha 7962225a122SSuresh Siddha if (req == PTRACE_GETREGSET) 7972225a122SSuresh Siddha return copy_regset_to_user(task, view, regset_no, 0, 7982225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 7992225a122SSuresh Siddha else 8002225a122SSuresh Siddha return copy_regset_from_user(task, view, regset_no, 0, 8012225a122SSuresh Siddha kiov->iov_len, kiov->iov_base); 8022225a122SSuresh Siddha } 8032225a122SSuresh Siddha 804e8440c14SJosh Stone /* 805e8440c14SJosh Stone * This is declared in linux/regset.h and defined in machine-dependent 806e8440c14SJosh Stone * code. We put the export here, near the primary machine-neutral use, 807e8440c14SJosh Stone * to ensure no machine forgets it. 808e8440c14SJosh Stone */ 809e8440c14SJosh Stone EXPORT_SYMBOL_GPL(task_user_regset_view); 8102225a122SSuresh Siddha #endif 8112225a122SSuresh Siddha 8121da177e4SLinus Torvalds int ptrace_request(struct task_struct *child, long request, 8134abf9869SNamhyung Kim unsigned long addr, unsigned long data) 8141da177e4SLinus Torvalds { 815fca26f26STejun Heo bool seized = child->ptrace & PT_SEIZED; 8161da177e4SLinus Torvalds int ret = -EIO; 817544b2c91STejun Heo siginfo_t siginfo, *si; 8189fed81dcSNamhyung Kim void __user *datavp = (void __user *) data; 8199fed81dcSNamhyung Kim unsigned long __user *datalp = datavp; 820fca26f26STejun Heo unsigned long flags; 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds switch (request) { 82316c3e389SRoland McGrath case PTRACE_PEEKTEXT: 82416c3e389SRoland McGrath case PTRACE_PEEKDATA: 82516c3e389SRoland McGrath return generic_ptrace_peekdata(child, addr, data); 82616c3e389SRoland McGrath case PTRACE_POKETEXT: 82716c3e389SRoland McGrath case PTRACE_POKEDATA: 82816c3e389SRoland McGrath return generic_ptrace_pokedata(child, addr, data); 82916c3e389SRoland McGrath 8301da177e4SLinus Torvalds #ifdef PTRACE_OLDSETOPTIONS 8311da177e4SLinus Torvalds case PTRACE_OLDSETOPTIONS: 8321da177e4SLinus Torvalds #endif 8331da177e4SLinus Torvalds case PTRACE_SETOPTIONS: 8341da177e4SLinus Torvalds ret = ptrace_setoptions(child, data); 8351da177e4SLinus Torvalds break; 8361da177e4SLinus Torvalds case PTRACE_GETEVENTMSG: 8379fed81dcSNamhyung Kim ret = put_user(child->ptrace_message, datalp); 8381da177e4SLinus Torvalds break; 839e16b2781SRoland McGrath 84084c751bdSAndrey Vagin case PTRACE_PEEKSIGINFO: 84184c751bdSAndrey Vagin ret = ptrace_peek_siginfo(child, addr, data); 84284c751bdSAndrey Vagin break; 84384c751bdSAndrey Vagin 8441da177e4SLinus Torvalds case PTRACE_GETSIGINFO: 845e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 846e16b2781SRoland McGrath if (!ret) 8479fed81dcSNamhyung Kim ret = copy_siginfo_to_user(datavp, &siginfo); 8481da177e4SLinus Torvalds break; 849e16b2781SRoland McGrath 8501da177e4SLinus Torvalds case PTRACE_SETSIGINFO: 8519fed81dcSNamhyung Kim if (copy_from_user(&siginfo, datavp, sizeof siginfo)) 852e16b2781SRoland McGrath ret = -EFAULT; 853e16b2781SRoland McGrath else 854e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 8551da177e4SLinus Torvalds break; 856e16b2781SRoland McGrath 85729000caeSAndrey Vagin case PTRACE_GETSIGMASK: 85829000caeSAndrey Vagin if (addr != sizeof(sigset_t)) { 85929000caeSAndrey Vagin ret = -EINVAL; 86029000caeSAndrey Vagin break; 86129000caeSAndrey Vagin } 86229000caeSAndrey Vagin 86329000caeSAndrey Vagin if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t))) 86429000caeSAndrey Vagin ret = -EFAULT; 86529000caeSAndrey Vagin else 86629000caeSAndrey Vagin ret = 0; 86729000caeSAndrey Vagin 86829000caeSAndrey Vagin break; 86929000caeSAndrey Vagin 87029000caeSAndrey Vagin case PTRACE_SETSIGMASK: { 87129000caeSAndrey Vagin sigset_t new_set; 87229000caeSAndrey Vagin 87329000caeSAndrey Vagin if (addr != sizeof(sigset_t)) { 87429000caeSAndrey Vagin ret = -EINVAL; 87529000caeSAndrey Vagin break; 87629000caeSAndrey Vagin } 87729000caeSAndrey Vagin 87829000caeSAndrey Vagin if (copy_from_user(&new_set, datavp, sizeof(sigset_t))) { 87929000caeSAndrey Vagin ret = -EFAULT; 88029000caeSAndrey Vagin break; 88129000caeSAndrey Vagin } 88229000caeSAndrey Vagin 88329000caeSAndrey Vagin sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP)); 88429000caeSAndrey Vagin 88529000caeSAndrey Vagin /* 88629000caeSAndrey Vagin * Every thread does recalc_sigpending() after resume, so 88729000caeSAndrey Vagin * retarget_shared_pending() and recalc_sigpending() are not 88829000caeSAndrey Vagin * called here. 88929000caeSAndrey Vagin */ 89029000caeSAndrey Vagin spin_lock_irq(&child->sighand->siglock); 89129000caeSAndrey Vagin child->blocked = new_set; 89229000caeSAndrey Vagin spin_unlock_irq(&child->sighand->siglock); 89329000caeSAndrey Vagin 89429000caeSAndrey Vagin ret = 0; 89529000caeSAndrey Vagin break; 89629000caeSAndrey Vagin } 89729000caeSAndrey Vagin 898fca26f26STejun Heo case PTRACE_INTERRUPT: 899fca26f26STejun Heo /* 900fca26f26STejun Heo * Stop tracee without any side-effect on signal or job 901fca26f26STejun Heo * control. At least one trap is guaranteed to happen 902fca26f26STejun Heo * after this request. If @child is already trapped, the 903fca26f26STejun Heo * current trap is not disturbed and another trap will 904fca26f26STejun Heo * happen after the current trap is ended with PTRACE_CONT. 905fca26f26STejun Heo * 906fca26f26STejun Heo * The actual trap might not be PTRACE_EVENT_STOP trap but 907fca26f26STejun Heo * the pending condition is cleared regardless. 908fca26f26STejun Heo */ 909fca26f26STejun Heo if (unlikely(!seized || !lock_task_sighand(child, &flags))) 910fca26f26STejun Heo break; 911fca26f26STejun Heo 912544b2c91STejun Heo /* 913544b2c91STejun Heo * INTERRUPT doesn't disturb existing trap sans one 914544b2c91STejun Heo * exception. If ptracer issued LISTEN for the current 915544b2c91STejun Heo * STOP, this INTERRUPT should clear LISTEN and re-trap 916544b2c91STejun Heo * tracee into STOP. 917544b2c91STejun Heo */ 918fca26f26STejun Heo if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP))) 919910ffdb1SOleg Nesterov ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING); 920544b2c91STejun Heo 921544b2c91STejun Heo unlock_task_sighand(child, &flags); 922544b2c91STejun Heo ret = 0; 923544b2c91STejun Heo break; 924544b2c91STejun Heo 925544b2c91STejun Heo case PTRACE_LISTEN: 926544b2c91STejun Heo /* 927544b2c91STejun Heo * Listen for events. Tracee must be in STOP. It's not 928544b2c91STejun Heo * resumed per-se but is not considered to be in TRACED by 929544b2c91STejun Heo * wait(2) or ptrace(2). If an async event (e.g. group 930544b2c91STejun Heo * stop state change) happens, tracee will enter STOP trap 931544b2c91STejun Heo * again. Alternatively, ptracer can issue INTERRUPT to 932544b2c91STejun Heo * finish listening and re-trap tracee into STOP. 933544b2c91STejun Heo */ 934544b2c91STejun Heo if (unlikely(!seized || !lock_task_sighand(child, &flags))) 935544b2c91STejun Heo break; 936544b2c91STejun Heo 937544b2c91STejun Heo si = child->last_siginfo; 938f9d81f61SOleg Nesterov if (likely(si && (si->si_code >> 8) == PTRACE_EVENT_STOP)) { 939544b2c91STejun Heo child->jobctl |= JOBCTL_LISTENING; 940544b2c91STejun Heo /* 941f9d81f61SOleg Nesterov * If NOTIFY is set, it means event happened between 942f9d81f61SOleg Nesterov * start of this trap and now. Trigger re-trap. 943544b2c91STejun Heo */ 944544b2c91STejun Heo if (child->jobctl & JOBCTL_TRAP_NOTIFY) 945910ffdb1SOleg Nesterov ptrace_signal_wake_up(child, true); 946fca26f26STejun Heo ret = 0; 947f9d81f61SOleg Nesterov } 948f9d81f61SOleg Nesterov unlock_task_sighand(child, &flags); 949fca26f26STejun Heo break; 950fca26f26STejun Heo 9511bcf5482SAlexey Dobriyan case PTRACE_DETACH: /* detach a process that was attached. */ 9521bcf5482SAlexey Dobriyan ret = ptrace_detach(child, data); 9531bcf5482SAlexey Dobriyan break; 95436df29d7SRoland McGrath 9559c1a1259SMike Frysinger #ifdef CONFIG_BINFMT_ELF_FDPIC 9569c1a1259SMike Frysinger case PTRACE_GETFDPIC: { 957e0129ef9SOleg Nesterov struct mm_struct *mm = get_task_mm(child); 9589c1a1259SMike Frysinger unsigned long tmp = 0; 9599c1a1259SMike Frysinger 960e0129ef9SOleg Nesterov ret = -ESRCH; 961e0129ef9SOleg Nesterov if (!mm) 962e0129ef9SOleg Nesterov break; 963e0129ef9SOleg Nesterov 9649c1a1259SMike Frysinger switch (addr) { 9659c1a1259SMike Frysinger case PTRACE_GETFDPIC_EXEC: 966e0129ef9SOleg Nesterov tmp = mm->context.exec_fdpic_loadmap; 9679c1a1259SMike Frysinger break; 9689c1a1259SMike Frysinger case PTRACE_GETFDPIC_INTERP: 969e0129ef9SOleg Nesterov tmp = mm->context.interp_fdpic_loadmap; 9709c1a1259SMike Frysinger break; 9719c1a1259SMike Frysinger default: 9729c1a1259SMike Frysinger break; 9739c1a1259SMike Frysinger } 974e0129ef9SOleg Nesterov mmput(mm); 9759c1a1259SMike Frysinger 9769fed81dcSNamhyung Kim ret = put_user(tmp, datalp); 9779c1a1259SMike Frysinger break; 9789c1a1259SMike Frysinger } 9799c1a1259SMike Frysinger #endif 9809c1a1259SMike Frysinger 98136df29d7SRoland McGrath #ifdef PTRACE_SINGLESTEP 98236df29d7SRoland McGrath case PTRACE_SINGLESTEP: 98336df29d7SRoland McGrath #endif 9845b88abbfSRoland McGrath #ifdef PTRACE_SINGLEBLOCK 9855b88abbfSRoland McGrath case PTRACE_SINGLEBLOCK: 9865b88abbfSRoland McGrath #endif 98736df29d7SRoland McGrath #ifdef PTRACE_SYSEMU 98836df29d7SRoland McGrath case PTRACE_SYSEMU: 98936df29d7SRoland McGrath case PTRACE_SYSEMU_SINGLESTEP: 99036df29d7SRoland McGrath #endif 99136df29d7SRoland McGrath case PTRACE_SYSCALL: 99236df29d7SRoland McGrath case PTRACE_CONT: 99336df29d7SRoland McGrath return ptrace_resume(child, request, data); 99436df29d7SRoland McGrath 99536df29d7SRoland McGrath case PTRACE_KILL: 99636df29d7SRoland McGrath if (child->exit_state) /* already dead */ 99736df29d7SRoland McGrath return 0; 99836df29d7SRoland McGrath return ptrace_resume(child, request, SIGKILL); 99936df29d7SRoland McGrath 10002225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 10012225a122SSuresh Siddha case PTRACE_GETREGSET: 100229000caeSAndrey Vagin case PTRACE_SETREGSET: { 10032225a122SSuresh Siddha struct iovec kiov; 10049fed81dcSNamhyung Kim struct iovec __user *uiov = datavp; 10052225a122SSuresh Siddha 10062225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 10072225a122SSuresh Siddha return -EFAULT; 10082225a122SSuresh Siddha 10092225a122SSuresh Siddha if (__get_user(kiov.iov_base, &uiov->iov_base) || 10102225a122SSuresh Siddha __get_user(kiov.iov_len, &uiov->iov_len)) 10112225a122SSuresh Siddha return -EFAULT; 10122225a122SSuresh Siddha 10132225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 10142225a122SSuresh Siddha if (!ret) 10152225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 10162225a122SSuresh Siddha break; 10172225a122SSuresh Siddha } 10182225a122SSuresh Siddha #endif 1019f8e529edSTycho Andersen 1020f8e529edSTycho Andersen case PTRACE_SECCOMP_GET_FILTER: 1021f8e529edSTycho Andersen ret = seccomp_get_filter(child, addr, datavp); 1022f8e529edSTycho Andersen break; 1023f8e529edSTycho Andersen 10241da177e4SLinus Torvalds default: 10251da177e4SLinus Torvalds break; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds return ret; 10291da177e4SLinus Torvalds } 1030481bed45SChristoph Hellwig 10318053bdd5SOleg Nesterov static struct task_struct *ptrace_get_task_struct(pid_t pid) 10326b9c7ed8SChristoph Hellwig { 10336b9c7ed8SChristoph Hellwig struct task_struct *child; 10346b9c7ed8SChristoph Hellwig 10358053bdd5SOleg Nesterov rcu_read_lock(); 1036228ebcbeSPavel Emelyanov child = find_task_by_vpid(pid); 1037481bed45SChristoph Hellwig if (child) 1038481bed45SChristoph Hellwig get_task_struct(child); 10398053bdd5SOleg Nesterov rcu_read_unlock(); 1040f400e198SSukadev Bhattiprolu 1041481bed45SChristoph Hellwig if (!child) 10426b9c7ed8SChristoph Hellwig return ERR_PTR(-ESRCH); 10436b9c7ed8SChristoph Hellwig return child; 1044481bed45SChristoph Hellwig } 1045481bed45SChristoph Hellwig 10460ac15559SChristoph Hellwig #ifndef arch_ptrace_attach 10470ac15559SChristoph Hellwig #define arch_ptrace_attach(child) do { } while (0) 10480ac15559SChristoph Hellwig #endif 10490ac15559SChristoph Hellwig 10504abf9869SNamhyung Kim SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, 10514abf9869SNamhyung Kim unsigned long, data) 1052481bed45SChristoph Hellwig { 1053481bed45SChristoph Hellwig struct task_struct *child; 1054481bed45SChristoph Hellwig long ret; 1055481bed45SChristoph Hellwig 10566b9c7ed8SChristoph Hellwig if (request == PTRACE_TRACEME) { 10576b9c7ed8SChristoph Hellwig ret = ptrace_traceme(); 10586ea6dd93SHaavard Skinnemoen if (!ret) 10596ea6dd93SHaavard Skinnemoen arch_ptrace_attach(current); 1060481bed45SChristoph Hellwig goto out; 10616b9c7ed8SChristoph Hellwig } 10626b9c7ed8SChristoph Hellwig 10636b9c7ed8SChristoph Hellwig child = ptrace_get_task_struct(pid); 10646b9c7ed8SChristoph Hellwig if (IS_ERR(child)) { 10656b9c7ed8SChristoph Hellwig ret = PTR_ERR(child); 10666b9c7ed8SChristoph Hellwig goto out; 10676b9c7ed8SChristoph Hellwig } 1068481bed45SChristoph Hellwig 10693544d72aSTejun Heo if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { 1070aa9147c9SDenys Vlasenko ret = ptrace_attach(child, request, addr, data); 10710ac15559SChristoph Hellwig /* 10720ac15559SChristoph Hellwig * Some architectures need to do book-keeping after 10730ac15559SChristoph Hellwig * a ptrace attach. 10740ac15559SChristoph Hellwig */ 10750ac15559SChristoph Hellwig if (!ret) 10760ac15559SChristoph Hellwig arch_ptrace_attach(child); 1077005f18dfSChristoph Hellwig goto out_put_task_struct; 1078481bed45SChristoph Hellwig } 1079481bed45SChristoph Hellwig 1080fca26f26STejun Heo ret = ptrace_check_attach(child, request == PTRACE_KILL || 1081fca26f26STejun Heo request == PTRACE_INTERRUPT); 1082481bed45SChristoph Hellwig if (ret < 0) 1083481bed45SChristoph Hellwig goto out_put_task_struct; 1084481bed45SChristoph Hellwig 1085481bed45SChristoph Hellwig ret = arch_ptrace(child, request, addr, data); 10869899d11fSOleg Nesterov if (ret || request != PTRACE_DETACH) 10879899d11fSOleg Nesterov ptrace_unfreeze_traced(child); 1088481bed45SChristoph Hellwig 1089481bed45SChristoph Hellwig out_put_task_struct: 1090481bed45SChristoph Hellwig put_task_struct(child); 1091481bed45SChristoph Hellwig out: 1092481bed45SChristoph Hellwig return ret; 1093481bed45SChristoph Hellwig } 109476647323SAlexey Dobriyan 10954abf9869SNamhyung Kim int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, 10964abf9869SNamhyung Kim unsigned long data) 109776647323SAlexey Dobriyan { 109876647323SAlexey Dobriyan unsigned long tmp; 109976647323SAlexey Dobriyan int copied; 110076647323SAlexey Dobriyan 110176647323SAlexey Dobriyan copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); 110276647323SAlexey Dobriyan if (copied != sizeof(tmp)) 110376647323SAlexey Dobriyan return -EIO; 110476647323SAlexey Dobriyan return put_user(tmp, (unsigned long __user *)data); 110576647323SAlexey Dobriyan } 1106f284ce72SAlexey Dobriyan 11074abf9869SNamhyung Kim int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, 11084abf9869SNamhyung Kim unsigned long data) 1109f284ce72SAlexey Dobriyan { 1110f284ce72SAlexey Dobriyan int copied; 1111f284ce72SAlexey Dobriyan 1112f284ce72SAlexey Dobriyan copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); 1113f284ce72SAlexey Dobriyan return (copied == sizeof(data)) ? 0 : -EIO; 1114f284ce72SAlexey Dobriyan } 1115032d82d9SRoland McGrath 111696b8936aSChristoph Hellwig #if defined CONFIG_COMPAT 1117032d82d9SRoland McGrath 1118032d82d9SRoland McGrath int compat_ptrace_request(struct task_struct *child, compat_long_t request, 1119032d82d9SRoland McGrath compat_ulong_t addr, compat_ulong_t data) 1120032d82d9SRoland McGrath { 1121032d82d9SRoland McGrath compat_ulong_t __user *datap = compat_ptr(data); 1122032d82d9SRoland McGrath compat_ulong_t word; 1123e16b2781SRoland McGrath siginfo_t siginfo; 1124032d82d9SRoland McGrath int ret; 1125032d82d9SRoland McGrath 1126032d82d9SRoland McGrath switch (request) { 1127032d82d9SRoland McGrath case PTRACE_PEEKTEXT: 1128032d82d9SRoland McGrath case PTRACE_PEEKDATA: 1129032d82d9SRoland McGrath ret = access_process_vm(child, addr, &word, sizeof(word), 0); 1130032d82d9SRoland McGrath if (ret != sizeof(word)) 1131032d82d9SRoland McGrath ret = -EIO; 1132032d82d9SRoland McGrath else 1133032d82d9SRoland McGrath ret = put_user(word, datap); 1134032d82d9SRoland McGrath break; 1135032d82d9SRoland McGrath 1136032d82d9SRoland McGrath case PTRACE_POKETEXT: 1137032d82d9SRoland McGrath case PTRACE_POKEDATA: 1138032d82d9SRoland McGrath ret = access_process_vm(child, addr, &data, sizeof(data), 1); 1139032d82d9SRoland McGrath ret = (ret != sizeof(data) ? -EIO : 0); 1140032d82d9SRoland McGrath break; 1141032d82d9SRoland McGrath 1142032d82d9SRoland McGrath case PTRACE_GETEVENTMSG: 1143032d82d9SRoland McGrath ret = put_user((compat_ulong_t) child->ptrace_message, datap); 1144032d82d9SRoland McGrath break; 1145032d82d9SRoland McGrath 1146e16b2781SRoland McGrath case PTRACE_GETSIGINFO: 1147e16b2781SRoland McGrath ret = ptrace_getsiginfo(child, &siginfo); 1148e16b2781SRoland McGrath if (!ret) 1149e16b2781SRoland McGrath ret = copy_siginfo_to_user32( 1150e16b2781SRoland McGrath (struct compat_siginfo __user *) datap, 1151e16b2781SRoland McGrath &siginfo); 1152e16b2781SRoland McGrath break; 1153e16b2781SRoland McGrath 1154e16b2781SRoland McGrath case PTRACE_SETSIGINFO: 1155e16b2781SRoland McGrath memset(&siginfo, 0, sizeof siginfo); 1156e16b2781SRoland McGrath if (copy_siginfo_from_user32( 1157e16b2781SRoland McGrath &siginfo, (struct compat_siginfo __user *) datap)) 1158e16b2781SRoland McGrath ret = -EFAULT; 1159e16b2781SRoland McGrath else 1160e16b2781SRoland McGrath ret = ptrace_setsiginfo(child, &siginfo); 1161e16b2781SRoland McGrath break; 11622225a122SSuresh Siddha #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 11632225a122SSuresh Siddha case PTRACE_GETREGSET: 11642225a122SSuresh Siddha case PTRACE_SETREGSET: 11652225a122SSuresh Siddha { 11662225a122SSuresh Siddha struct iovec kiov; 11672225a122SSuresh Siddha struct compat_iovec __user *uiov = 11682225a122SSuresh Siddha (struct compat_iovec __user *) datap; 11692225a122SSuresh Siddha compat_uptr_t ptr; 11702225a122SSuresh Siddha compat_size_t len; 11712225a122SSuresh Siddha 11722225a122SSuresh Siddha if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) 11732225a122SSuresh Siddha return -EFAULT; 11742225a122SSuresh Siddha 11752225a122SSuresh Siddha if (__get_user(ptr, &uiov->iov_base) || 11762225a122SSuresh Siddha __get_user(len, &uiov->iov_len)) 11772225a122SSuresh Siddha return -EFAULT; 11782225a122SSuresh Siddha 11792225a122SSuresh Siddha kiov.iov_base = compat_ptr(ptr); 11802225a122SSuresh Siddha kiov.iov_len = len; 11812225a122SSuresh Siddha 11822225a122SSuresh Siddha ret = ptrace_regset(child, request, addr, &kiov); 11832225a122SSuresh Siddha if (!ret) 11842225a122SSuresh Siddha ret = __put_user(kiov.iov_len, &uiov->iov_len); 11852225a122SSuresh Siddha break; 11862225a122SSuresh Siddha } 11872225a122SSuresh Siddha #endif 1188e16b2781SRoland McGrath 1189032d82d9SRoland McGrath default: 1190032d82d9SRoland McGrath ret = ptrace_request(child, request, addr, data); 1191032d82d9SRoland McGrath } 1192032d82d9SRoland McGrath 1193032d82d9SRoland McGrath return ret; 1194032d82d9SRoland McGrath } 1195c269f196SRoland McGrath 119662a6fa97SHeiko Carstens COMPAT_SYSCALL_DEFINE4(ptrace, compat_long_t, request, compat_long_t, pid, 119762a6fa97SHeiko Carstens compat_long_t, addr, compat_long_t, data) 1198c269f196SRoland McGrath { 1199c269f196SRoland McGrath struct task_struct *child; 1200c269f196SRoland McGrath long ret; 1201c269f196SRoland McGrath 1202c269f196SRoland McGrath if (request == PTRACE_TRACEME) { 1203c269f196SRoland McGrath ret = ptrace_traceme(); 1204c269f196SRoland McGrath goto out; 1205c269f196SRoland McGrath } 1206c269f196SRoland McGrath 1207c269f196SRoland McGrath child = ptrace_get_task_struct(pid); 1208c269f196SRoland McGrath if (IS_ERR(child)) { 1209c269f196SRoland McGrath ret = PTR_ERR(child); 1210c269f196SRoland McGrath goto out; 1211c269f196SRoland McGrath } 1212c269f196SRoland McGrath 12133544d72aSTejun Heo if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { 1214aa9147c9SDenys Vlasenko ret = ptrace_attach(child, request, addr, data); 1215c269f196SRoland McGrath /* 1216c269f196SRoland McGrath * Some architectures need to do book-keeping after 1217c269f196SRoland McGrath * a ptrace attach. 1218c269f196SRoland McGrath */ 1219c269f196SRoland McGrath if (!ret) 1220c269f196SRoland McGrath arch_ptrace_attach(child); 1221c269f196SRoland McGrath goto out_put_task_struct; 1222c269f196SRoland McGrath } 1223c269f196SRoland McGrath 1224fca26f26STejun Heo ret = ptrace_check_attach(child, request == PTRACE_KILL || 1225fca26f26STejun Heo request == PTRACE_INTERRUPT); 12269899d11fSOleg Nesterov if (!ret) { 1227c269f196SRoland McGrath ret = compat_arch_ptrace(child, request, addr, data); 12289899d11fSOleg Nesterov if (ret || request != PTRACE_DETACH) 12299899d11fSOleg Nesterov ptrace_unfreeze_traced(child); 12309899d11fSOleg Nesterov } 1231c269f196SRoland McGrath 1232c269f196SRoland McGrath out_put_task_struct: 1233c269f196SRoland McGrath put_task_struct(child); 1234c269f196SRoland McGrath out: 1235c269f196SRoland McGrath return ret; 1236c269f196SRoland McGrath } 123796b8936aSChristoph Hellwig #endif /* CONFIG_COMPAT */ 1238