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kernel/ptrace.c
30.6 KB
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/* * linux/kernel/ptrace.c * * (C) Copyright 1999 Linus Torvalds * * Common interfaces for "ptrace()" which we do not want * to continually duplicate across every architecture. */ |
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#include <linux/capability.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/pagemap.h> |
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#include <linux/ptrace.h> #include <linux/security.h> |
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#include <linux/signal.h> |
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#include <linux/uio.h> |
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#include <linux/audit.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/syscalls.h> |
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#include <linux/uaccess.h> |
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#include <linux/regset.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/cn_proc.h> |
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#include <linux/compat.h> |
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/* |
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* ptrace a task: make the debugger its new parent and * move it to the ptrace list. * * Must be called with the tasklist lock write-held. */ |
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void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) |
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{ |
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BUG_ON(!list_empty(&child->ptrace_entry)); list_add(&child->ptrace_entry, &new_parent->ptraced); |
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child->parent = new_parent; |
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} |
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/** * __ptrace_unlink - unlink ptracee and restore its execution state * @child: ptracee to be unlinked |
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* |
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* Remove @child from the ptrace list, move it back to the original parent, * and restore the execution state so that it conforms to the group stop * state. * * Unlinking can happen via two paths - explicit PTRACE_DETACH or ptracer * exiting. For PTRACE_DETACH, unless the ptracee has been killed between * ptrace_check_attach() and here, it's guaranteed to be in TASK_TRACED. * If the ptracer is exiting, the ptracee can be in any state. * * After detach, the ptracee should be in a state which conforms to the * group stop. If the group is stopped or in the process of stopping, the * ptracee should be put into TASK_STOPPED; otherwise, it should be woken * up from TASK_TRACED. * * If the ptracee is in TASK_TRACED and needs to be moved to TASK_STOPPED, * it goes through TRACED -> RUNNING -> STOPPED transition which is similar * to but in the opposite direction of what happens while attaching to a * stopped task. However, in this direction, the intermediate RUNNING * state is not hidden even from the current ptracer and if it immediately * re-attaches and performs a WNOHANG wait(2), it may fail. |
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* * CONTEXT: * write_lock_irq(tasklist_lock) |
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*/ |
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void __ptrace_unlink(struct task_struct *child) |
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{ |
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BUG_ON(!child->ptrace); |
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child->ptrace = 0; |
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child->parent = child->real_parent; list_del_init(&child->ptrace_entry); |
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|
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spin_lock(&child->sighand->siglock); |
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/* |
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* Clear all pending traps and TRAPPING. TRAPPING should be * cleared regardless of JOBCTL_STOP_PENDING. Do it explicitly. */ task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK); task_clear_jobctl_trapping(child); /* |
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* Reinstate JOBCTL_STOP_PENDING if group stop is in effect and |
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* @child isn't dead. */ if (!(child->flags & PF_EXITING) && (child->signal->flags & SIGNAL_STOP_STOPPED || |
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child->signal->group_stop_count)) { |
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child->jobctl |= JOBCTL_STOP_PENDING; |
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/* * This is only possible if this thread was cloned by the * traced task running in the stopped group, set the signal * for the future reports. * FIXME: we should change ptrace_init_task() to handle this * case. */ if (!(child->jobctl & JOBCTL_STOP_SIGMASK)) child->jobctl |= SIGSTOP; } |
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/* * If transition to TASK_STOPPED is pending or in TASK_TRACED, kick * @child in the butt. Note that @resume should be used iff @child * is in TASK_TRACED; otherwise, we might unduly disrupt * TASK_KILLABLE sleeps. */ |
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if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child)) |
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ptrace_signal_wake_up(child, true); |
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spin_unlock(&child->sighand->siglock); |
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} |
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/* Ensure that nothing can wake it up, even SIGKILL */ static bool ptrace_freeze_traced(struct task_struct *task) { bool ret = false; /* Lockless, nobody but us can set this flag */ if (task->jobctl & JOBCTL_LISTENING) return ret; spin_lock_irq(&task->sighand->siglock); if (task_is_traced(task) && !__fatal_signal_pending(task)) { task->state = __TASK_TRACED; ret = true; } spin_unlock_irq(&task->sighand->siglock); return ret; } static void ptrace_unfreeze_traced(struct task_struct *task) { if (task->state != __TASK_TRACED) return; WARN_ON(!task->ptrace || task->parent != current); spin_lock_irq(&task->sighand->siglock); if (__fatal_signal_pending(task)) wake_up_state(task, __TASK_TRACED); else task->state = TASK_TRACED; spin_unlock_irq(&task->sighand->siglock); } |
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/** * ptrace_check_attach - check whether ptracee is ready for ptrace operation * @child: ptracee to check for * @ignore_state: don't check whether @child is currently %TASK_TRACED * * Check whether @child is being ptraced by %current and ready for further * ptrace operations. If @ignore_state is %false, @child also should be in * %TASK_TRACED state and on return the child is guaranteed to be traced * and not executing. If @ignore_state is %true, @child can be in any * state. * * CONTEXT: * Grabs and releases tasklist_lock and @child->sighand->siglock. * * RETURNS: * 0 on success, -ESRCH if %child is not ready. |
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*/ |
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static int ptrace_check_attach(struct task_struct *child, bool ignore_state) |
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{ int ret = -ESRCH; /* * We take the read lock around doing both checks to close a * possible race where someone else was tracing our child and * detached between these two checks. After this locked check, * we are sure that this is our traced child and that can only * be changed by us so it's not changing right after this. */ read_lock(&tasklist_lock); |
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if (child->ptrace && child->parent == current) { WARN_ON(child->state == __TASK_TRACED); |
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/* * child->sighand can't be NULL, release_task() * does ptrace_unlink() before __exit_signal(). */ |
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if (ignore_state || ptrace_freeze_traced(child)) |
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ret = 0; |
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} read_unlock(&tasklist_lock); |
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if (!ret && !ignore_state) { if (!wait_task_inactive(child, __TASK_TRACED)) { /* * This can only happen if may_ptrace_stop() fails and * ptrace_stop() changes ->state back to TASK_RUNNING, * so we should not worry about leaking __TASK_TRACED. */ WARN_ON(child->state == __TASK_TRACED); ret = -ESRCH; } } |
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return ret; } |
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static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode) { if (mode & PTRACE_MODE_NOAUDIT) return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE); else return has_ns_capability(current, ns, CAP_SYS_PTRACE); } |
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/* Returns 0 on success, -errno on denial. */ static int __ptrace_may_access(struct task_struct *task, unsigned int mode) |
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{ |
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const struct cred *cred = current_cred(), *tcred; |
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/* May we inspect the given task? * This check is used both for attaching with ptrace * and for allowing access to sensitive information in /proc. * * ptrace_attach denies several cases that /proc allows * because setting up the necessary parent/child relationship * or halting the specified task is impossible. */ int dumpable = 0; /* Don't let security modules deny introspection */ |
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if (same_thread_group(task, current)) |
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return 0; |
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rcu_read_lock(); tcred = __task_cred(task); |
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if (uid_eq(cred->uid, tcred->euid) && uid_eq(cred->uid, tcred->suid) && uid_eq(cred->uid, tcred->uid) && gid_eq(cred->gid, tcred->egid) && gid_eq(cred->gid, tcred->sgid) && gid_eq(cred->gid, tcred->gid)) |
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goto ok; |
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if (ptrace_has_cap(tcred->user_ns, mode)) |
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goto ok; rcu_read_unlock(); return -EPERM; ok: |
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rcu_read_unlock(); |
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smp_rmb(); |
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if (task->mm) |
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dumpable = get_dumpable(task->mm); |
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rcu_read_lock(); |
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if (dumpable != SUID_DUMP_USER && !ptrace_has_cap(__task_cred(task)->user_ns, mode)) { |
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rcu_read_unlock(); |
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return -EPERM; |
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} rcu_read_unlock(); |
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return security_ptrace_access_check(task, mode); |
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} |
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bool ptrace_may_access(struct task_struct *task, unsigned int mode) |
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{ int err; task_lock(task); |
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err = __ptrace_may_access(task, mode); |
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task_unlock(task); |
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return !err; |
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} |
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static int ptrace_attach(struct task_struct *task, long request, |
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unsigned long addr, |
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unsigned long flags) |
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{ |
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bool seize = (request == PTRACE_SEIZE); |
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int retval; |
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retval = -EIO; |
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if (seize) { if (addr != 0) goto out; |
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if (flags & ~(unsigned long)PTRACE_O_MASK) goto out; flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT); } else { flags = PT_PTRACED; } |
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audit_ptrace(task); |
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retval = -EPERM; |
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if (unlikely(task->flags & PF_KTHREAD)) goto out; |
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if (same_thread_group(task, current)) |
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goto out; |
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/* * Protect exec's credential calculations against our interference; |
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* SUID, SGID and LSM creds get determined differently |
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* under ptrace. |
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*/ |
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retval = -ERESTARTNOINTR; |
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if (mutex_lock_interruptible(&task->signal->cred_guard_mutex)) |
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goto out; |
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task_lock(task); |
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retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH); |
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task_unlock(task); |
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if (retval) |
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goto unlock_creds; |
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write_lock_irq(&tasklist_lock); |
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retval = -EPERM; if (unlikely(task->exit_state)) |
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goto unlock_tasklist; |
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if (task->ptrace) |
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goto unlock_tasklist; |
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if (seize) |
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flags |= PT_SEIZED; |
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rcu_read_lock(); if (ns_capable(__task_cred(task)->user_ns, CAP_SYS_PTRACE)) |
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flags |= PT_PTRACE_CAP; |
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rcu_read_unlock(); |
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task->ptrace = flags; |
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__ptrace_link(task, current); |
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/* SEIZE doesn't trap tracee on attach */ if (!seize) send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); |
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spin_lock(&task->sighand->siglock); /* |
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* If the task is already STOPPED, set JOBCTL_TRAP_STOP and |
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* TRAPPING, and kick it so that it transits to TRACED. TRAPPING * will be cleared if the child completes the transition or any * event which clears the group stop states happens. We'll wait * for the transition to complete before returning from this * function. * * This hides STOPPED -> RUNNING -> TRACED transition from the * attaching thread but a different thread in the same group can * still observe the transient RUNNING state. IOW, if another * thread's WNOHANG wait(2) on the stopped tracee races against * ATTACH, the wait(2) may fail due to the transient RUNNING. * * The following task_is_stopped() test is safe as both transitions * in and out of STOPPED are protected by siglock. */ |
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if (task_is_stopped(task) && |
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task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) |
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signal_wake_up_state(task, __TASK_STOPPED); |
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spin_unlock(&task->sighand->siglock); |
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retval = 0; |
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unlock_tasklist: write_unlock_irq(&tasklist_lock); unlock_creds: |
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mutex_unlock(&task->signal->cred_guard_mutex); |
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out: |
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if (!retval) { |
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wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, |
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TASK_UNINTERRUPTIBLE); |
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proc_ptrace_connector(task, PTRACE_ATTACH); } |
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return retval; } |
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/** * ptrace_traceme -- helper for PTRACE_TRACEME * * Performs checks and sets PT_PTRACED. * Should be used by all ptrace implementations for PTRACE_TRACEME. */ |
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static int ptrace_traceme(void) |
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{ int ret = -EPERM; |
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write_lock_irq(&tasklist_lock); /* Are we already being traced? */ |
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if (!current->ptrace) { |
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ret = security_ptrace_traceme(current->parent); |
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/* * Check PF_EXITING to ensure ->real_parent has not passed * exit_ptrace(). Otherwise we don't report the error but * pretend ->real_parent untraces us right after return. */ if (!ret && !(current->real_parent->flags & PF_EXITING)) { current->ptrace = PT_PTRACED; __ptrace_link(current, current->real_parent); } |
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} |
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write_unlock_irq(&tasklist_lock); |
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return ret; } |
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/* * Called with irqs disabled, returns true if childs should reap themselves. */ static int ignoring_children(struct sighand_struct *sigh) { int ret; spin_lock(&sigh->siglock); ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) || (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT); spin_unlock(&sigh->siglock); return ret; } /* * Called with tasklist_lock held for writing. * Unlink a traced task, and clean it up if it was a traced zombie. * Return true if it needs to be reaped with release_task(). * (We can't call release_task() here because we already hold tasklist_lock.) * * If it's a zombie, our attachedness prevented normal parent notification * or self-reaping. Do notification now if it would have happened earlier. * If it should reap itself, return true. * |
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* If it's our own child, there is no notification to do. But if our normal * children self-reap, then this child was prevented by ptrace and we must * reap it now, in that case we must also wake up sub-threads sleeping in * do_wait(). |
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*/ static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p) { |
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bool dead; |
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__ptrace_unlink(p); |
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if (p->exit_state != EXIT_ZOMBIE) return false; dead = !thread_group_leader(p); if (!dead && thread_group_empty(p)) { if (!same_thread_group(p->real_parent, tracer)) dead = do_notify_parent(p, p->exit_signal); else if (ignoring_children(tracer->sighand)) { __wake_up_parent(p, tracer); |
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dead = true; |
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} } |
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/* Mark it as in the process of being reaped. */ if (dead) p->exit_state = EXIT_DEAD; return dead; |
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} |
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static int ptrace_detach(struct task_struct *child, unsigned int data) |
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{ |
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if (!valid_signal(data)) |
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return -EIO; |
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/* Architecture-specific hardware disable .. */ ptrace_disable(child); |
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
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write_lock_irq(&tasklist_lock); |
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/* |
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* We rely on ptrace_freeze_traced(). It can't be killed and * untraced by another thread, it can't be a zombie. |
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*/ |
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WARN_ON(!child->ptrace || child->exit_state); /* * tasklist_lock avoids the race with wait_task_stopped(), see * the comment in ptrace_resume(). */ child->exit_code = data; __ptrace_detach(current, child); |
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write_unlock_irq(&tasklist_lock); |
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proc_ptrace_connector(child, PTRACE_DETACH); |
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|
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return 0; } |
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/* |
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* Detach all tasks we were using ptrace on. Called with tasklist held |
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* for writing. |
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*/ |
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void exit_ptrace(struct task_struct *tracer, struct list_head *dead) |
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{ struct task_struct *p, *n; |
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|
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list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) { |
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if (unlikely(p->ptrace & PT_EXITKILL)) send_sig_info(SIGKILL, SEND_SIG_FORCED, p); |
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if (__ptrace_detach(tracer, p)) |
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list_add(&p->ptrace_entry, dead); |
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} } |
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|
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len) { int copied = 0; while (len > 0) { char buf[128]; int this_len, retval; this_len = (len > sizeof(buf)) ? sizeof(buf) : len; retval = access_process_vm(tsk, src, buf, this_len, 0); if (!retval) { if (copied) break; return -EIO; } if (copy_to_user(dst, buf, retval)) return -EFAULT; copied += retval; src += retval; dst += retval; |
3a7097035
|
497 |
len -= retval; |
1da177e4c
|
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 |
} return copied; } int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len) { int copied = 0; while (len > 0) { char buf[128]; int this_len, retval; this_len = (len > sizeof(buf)) ? sizeof(buf) : len; if (copy_from_user(buf, src, this_len)) return -EFAULT; retval = access_process_vm(tsk, dst, buf, this_len, 1); if (!retval) { if (copied) break; return -EIO; } copied += retval; src += retval; dst += retval; |
3a7097035
|
522 |
len -= retval; |
1da177e4c
|
523 524 525 |
} return copied; } |
4abf98696
|
526 |
static int ptrace_setoptions(struct task_struct *child, unsigned long data) |
1da177e4c
|
527 |
{ |
86b6c1f30
|
528 |
unsigned flags; |
8c5cf9e5c
|
529 530 |
if (data & ~(unsigned long)PTRACE_O_MASK) return -EINVAL; |
13c4a9011
|
531 532 533 534 535 536 537 538 539 540 541 542 |
if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) { if (!config_enabled(CONFIG_CHECKPOINT_RESTORE) || !config_enabled(CONFIG_SECCOMP)) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (seccomp_mode(¤t->seccomp) != SECCOMP_MODE_DISABLED || current->ptrace & PT_SUSPEND_SECCOMP) return -EPERM; } |
86b6c1f30
|
543 544 545 546 547 |
/* Avoid intermediate state when all opts are cleared */ flags = child->ptrace; flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT); flags |= (data << PT_OPT_FLAG_SHIFT); child->ptrace = flags; |
1da177e4c
|
548 |
|
8c5cf9e5c
|
549 |
return 0; |
1da177e4c
|
550 |
} |
e16b27816
|
551 |
static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) |
1da177e4c
|
552 |
{ |
e49612544
|
553 |
unsigned long flags; |
1da177e4c
|
554 |
int error = -ESRCH; |
e49612544
|
555 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c
|
556 |
error = -EINVAL; |
1da177e4c
|
557 |
if (likely(child->last_siginfo != NULL)) { |
e16b27816
|
558 |
*info = *child->last_siginfo; |
1da177e4c
|
559 560 |
error = 0; } |
e49612544
|
561 |
unlock_task_sighand(child, &flags); |
1da177e4c
|
562 |
} |
1da177e4c
|
563 564 |
return error; } |
e16b27816
|
565 |
static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) |
1da177e4c
|
566 |
{ |
e49612544
|
567 |
unsigned long flags; |
1da177e4c
|
568 |
int error = -ESRCH; |
e49612544
|
569 |
if (lock_task_sighand(child, &flags)) { |
1da177e4c
|
570 |
error = -EINVAL; |
1da177e4c
|
571 |
if (likely(child->last_siginfo != NULL)) { |
e16b27816
|
572 |
*child->last_siginfo = *info; |
1da177e4c
|
573 574 |
error = 0; } |
e49612544
|
575 |
unlock_task_sighand(child, &flags); |
1da177e4c
|
576 |
} |
1da177e4c
|
577 578 |
return error; } |
84c751bd4
|
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 |
static int ptrace_peek_siginfo(struct task_struct *child, unsigned long addr, unsigned long data) { struct ptrace_peeksiginfo_args arg; struct sigpending *pending; struct sigqueue *q; int ret, i; ret = copy_from_user(&arg, (void __user *) addr, sizeof(struct ptrace_peeksiginfo_args)); if (ret) return -EFAULT; if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED) return -EINVAL; /* unknown flags */ if (arg.nr < 0) return -EINVAL; if (arg.flags & PTRACE_PEEKSIGINFO_SHARED) pending = &child->signal->shared_pending; else pending = &child->pending; for (i = 0; i < arg.nr; ) { siginfo_t info; s32 off = arg.off + i; spin_lock_irq(&child->sighand->siglock); list_for_each_entry(q, &pending->list, list) { if (!off--) { copy_siginfo(&info, &q->info); break; } } spin_unlock_irq(&child->sighand->siglock); if (off >= 0) /* beyond the end of the list */ break; #ifdef CONFIG_COMPAT if (unlikely(is_compat_task())) { compat_siginfo_t __user *uinfo = compat_ptr(data); |
706b23bde
|
623 624 625 626 627 |
if (copy_siginfo_to_user32(uinfo, &info) || __put_user(info.si_code, &uinfo->si_code)) { ret = -EFAULT; break; } |
84c751bd4
|
628 629 630 631 |
} else #endif { siginfo_t __user *uinfo = (siginfo_t __user *) data; |
706b23bde
|
632 633 634 635 636 |
if (copy_siginfo_to_user(uinfo, &info) || __put_user(info.si_code, &uinfo->si_code)) { ret = -EFAULT; break; } |
84c751bd4
|
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 |
} data += sizeof(siginfo_t); i++; if (signal_pending(current)) break; cond_resched(); } if (i > 0) return i; return ret; } |
36df29d79
|
653 654 655 656 657 658 |
#ifdef PTRACE_SINGLESTEP #define is_singlestep(request) ((request) == PTRACE_SINGLESTEP) #else #define is_singlestep(request) 0 #endif |
5b88abbf7
|
659 660 661 662 663 |
#ifdef PTRACE_SINGLEBLOCK #define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK) #else #define is_singleblock(request) 0 #endif |
36df29d79
|
664 665 666 667 668 |
#ifdef PTRACE_SYSEMU #define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP) #else #define is_sysemu_singlestep(request) 0 #endif |
4abf98696
|
669 670 |
static int ptrace_resume(struct task_struct *child, long request, unsigned long data) |
36df29d79
|
671 |
{ |
b72c18699
|
672 |
bool need_siglock; |
36df29d79
|
673 674 675 676 677 678 679 680 681 682 683 684 685 686 |
if (!valid_signal(data)) return -EIO; if (request == PTRACE_SYSCALL) set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); else clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); #ifdef TIF_SYSCALL_EMU if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP) set_tsk_thread_flag(child, TIF_SYSCALL_EMU); else clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); #endif |
5b88abbf7
|
687 688 689 690 691 |
if (is_singleblock(request)) { if (unlikely(!arch_has_block_step())) return -EIO; user_enable_block_step(child); } else if (is_singlestep(request) || is_sysemu_singlestep(request)) { |
36df29d79
|
692 693 694 |
if (unlikely(!arch_has_single_step())) return -EIO; user_enable_single_step(child); |
3a7097035
|
695 |
} else { |
36df29d79
|
696 |
user_disable_single_step(child); |
3a7097035
|
697 |
} |
36df29d79
|
698 |
|
b72c18699
|
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 |
/* * Change ->exit_code and ->state under siglock to avoid the race * with wait_task_stopped() in between; a non-zero ->exit_code will * wrongly look like another report from tracee. * * Note that we need siglock even if ->exit_code == data and/or this * status was not reported yet, the new status must not be cleared by * wait_task_stopped() after resume. * * If data == 0 we do not care if wait_task_stopped() reports the old * status and clears the code too; this can't race with the tracee, it * takes siglock after resume. */ need_siglock = data && !thread_group_empty(current); if (need_siglock) spin_lock_irq(&child->sighand->siglock); |
36df29d79
|
715 |
child->exit_code = data; |
0666fb51b
|
716 |
wake_up_state(child, __TASK_TRACED); |
b72c18699
|
717 718 |
if (need_siglock) spin_unlock_irq(&child->sighand->siglock); |
36df29d79
|
719 720 721 |
return 0; } |
2225a122a
|
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK static const struct user_regset * find_regset(const struct user_regset_view *view, unsigned int type) { const struct user_regset *regset; int n; for (n = 0; n < view->n; ++n) { regset = view->regsets + n; if (regset->core_note_type == type) return regset; } return NULL; } static int ptrace_regset(struct task_struct *task, int req, unsigned int type, struct iovec *kiov) { const struct user_regset_view *view = task_user_regset_view(task); const struct user_regset *regset = find_regset(view, type); int regset_no; if (!regset || (kiov->iov_len % regset->size) != 0) |
c6a0dd7ec
|
747 |
return -EINVAL; |
2225a122a
|
748 749 750 751 752 753 754 755 756 757 758 759 |
regset_no = regset - view->regsets; kiov->iov_len = min(kiov->iov_len, (__kernel_size_t) (regset->n * regset->size)); if (req == PTRACE_GETREGSET) return copy_regset_to_user(task, view, regset_no, 0, kiov->iov_len, kiov->iov_base); else return copy_regset_from_user(task, view, regset_no, 0, kiov->iov_len, kiov->iov_base); } |
e8440c145
|
760 761 762 763 764 765 |
/* * This is declared in linux/regset.h and defined in machine-dependent * code. We put the export here, near the primary machine-neutral use, * to ensure no machine forgets it. */ EXPORT_SYMBOL_GPL(task_user_regset_view); |
2225a122a
|
766 |
#endif |
1da177e4c
|
767 |
int ptrace_request(struct task_struct *child, long request, |
4abf98696
|
768 |
unsigned long addr, unsigned long data) |
1da177e4c
|
769 |
{ |
fca26f260
|
770 |
bool seized = child->ptrace & PT_SEIZED; |
1da177e4c
|
771 |
int ret = -EIO; |
544b2c91a
|
772 |
siginfo_t siginfo, *si; |
9fed81dc4
|
773 774 |
void __user *datavp = (void __user *) data; unsigned long __user *datalp = datavp; |
fca26f260
|
775 |
unsigned long flags; |
1da177e4c
|
776 777 |
switch (request) { |
16c3e389e
|
778 779 780 781 782 783 |
case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: return generic_ptrace_peekdata(child, addr, data); case PTRACE_POKETEXT: case PTRACE_POKEDATA: return generic_ptrace_pokedata(child, addr, data); |
1da177e4c
|
784 785 786 787 788 789 790 |
#ifdef PTRACE_OLDSETOPTIONS case PTRACE_OLDSETOPTIONS: #endif case PTRACE_SETOPTIONS: ret = ptrace_setoptions(child, data); break; case PTRACE_GETEVENTMSG: |
9fed81dc4
|
791 |
ret = put_user(child->ptrace_message, datalp); |
1da177e4c
|
792 |
break; |
e16b27816
|
793 |
|
84c751bd4
|
794 795 796 |
case PTRACE_PEEKSIGINFO: ret = ptrace_peek_siginfo(child, addr, data); break; |
1da177e4c
|
797 |
case PTRACE_GETSIGINFO: |
e16b27816
|
798 799 |
ret = ptrace_getsiginfo(child, &siginfo); if (!ret) |
9fed81dc4
|
800 |
ret = copy_siginfo_to_user(datavp, &siginfo); |
1da177e4c
|
801 |
break; |
e16b27816
|
802 |
|
1da177e4c
|
803 |
case PTRACE_SETSIGINFO: |
9fed81dc4
|
804 |
if (copy_from_user(&siginfo, datavp, sizeof siginfo)) |
e16b27816
|
805 806 807 |
ret = -EFAULT; else ret = ptrace_setsiginfo(child, &siginfo); |
1da177e4c
|
808 |
break; |
e16b27816
|
809 |
|
29000caec
|
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 |
case PTRACE_GETSIGMASK: if (addr != sizeof(sigset_t)) { ret = -EINVAL; break; } if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t))) ret = -EFAULT; else ret = 0; break; case PTRACE_SETSIGMASK: { sigset_t new_set; if (addr != sizeof(sigset_t)) { ret = -EINVAL; break; } if (copy_from_user(&new_set, datavp, sizeof(sigset_t))) { ret = -EFAULT; break; } sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP)); /* * Every thread does recalc_sigpending() after resume, so * retarget_shared_pending() and recalc_sigpending() are not * called here. */ spin_lock_irq(&child->sighand->siglock); child->blocked = new_set; spin_unlock_irq(&child->sighand->siglock); ret = 0; break; } |
fca26f260
|
850 851 852 853 854 855 856 857 858 859 860 861 862 |
case PTRACE_INTERRUPT: /* * Stop tracee without any side-effect on signal or job * control. At least one trap is guaranteed to happen * after this request. If @child is already trapped, the * current trap is not disturbed and another trap will * happen after the current trap is ended with PTRACE_CONT. * * The actual trap might not be PTRACE_EVENT_STOP trap but * the pending condition is cleared regardless. */ if (unlikely(!seized || !lock_task_sighand(child, &flags))) break; |
544b2c91a
|
863 864 865 866 867 868 |
/* * INTERRUPT doesn't disturb existing trap sans one * exception. If ptracer issued LISTEN for the current * STOP, this INTERRUPT should clear LISTEN and re-trap * tracee into STOP. */ |
fca26f260
|
869 |
if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP))) |
910ffdb18
|
870 |
ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING); |
544b2c91a
|
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 |
unlock_task_sighand(child, &flags); ret = 0; break; case PTRACE_LISTEN: /* * Listen for events. Tracee must be in STOP. It's not * resumed per-se but is not considered to be in TRACED by * wait(2) or ptrace(2). If an async event (e.g. group * stop state change) happens, tracee will enter STOP trap * again. Alternatively, ptracer can issue INTERRUPT to * finish listening and re-trap tracee into STOP. */ if (unlikely(!seized || !lock_task_sighand(child, &flags))) break; si = child->last_siginfo; |
f9d81f61c
|
889 890 891 892 893 894 895 |
if (likely(si && (si->si_code >> 8) == PTRACE_EVENT_STOP)) { child->jobctl |= JOBCTL_LISTENING; /* * If NOTIFY is set, it means event happened between * start of this trap and now. Trigger re-trap. */ if (child->jobctl & JOBCTL_TRAP_NOTIFY) |
910ffdb18
|
896 |
ptrace_signal_wake_up(child, true); |
f9d81f61c
|
897 898 |
ret = 0; } |
fca26f260
|
899 |
unlock_task_sighand(child, &flags); |
fca26f260
|
900 |
break; |
1bcf54829
|
901 902 903 |
case PTRACE_DETACH: /* detach a process that was attached. */ ret = ptrace_detach(child, data); break; |
36df29d79
|
904 |
|
9c1a12592
|
905 906 |
#ifdef CONFIG_BINFMT_ELF_FDPIC case PTRACE_GETFDPIC: { |
e0129ef91
|
907 |
struct mm_struct *mm = get_task_mm(child); |
9c1a12592
|
908 |
unsigned long tmp = 0; |
e0129ef91
|
909 910 911 |
ret = -ESRCH; if (!mm) break; |
9c1a12592
|
912 913 |
switch (addr) { case PTRACE_GETFDPIC_EXEC: |
e0129ef91
|
914 |
tmp = mm->context.exec_fdpic_loadmap; |
9c1a12592
|
915 916 |
break; case PTRACE_GETFDPIC_INTERP: |
e0129ef91
|
917 |
tmp = mm->context.interp_fdpic_loadmap; |
9c1a12592
|
918 919 920 921 |
break; default: break; } |
e0129ef91
|
922 |
mmput(mm); |
9c1a12592
|
923 |
|
9fed81dc4
|
924 |
ret = put_user(tmp, datalp); |
9c1a12592
|
925 926 927 |
break; } #endif |
36df29d79
|
928 929 930 |
#ifdef PTRACE_SINGLESTEP case PTRACE_SINGLESTEP: #endif |
5b88abbf7
|
931 932 933 |
#ifdef PTRACE_SINGLEBLOCK case PTRACE_SINGLEBLOCK: #endif |
36df29d79
|
934 935 936 937 938 939 940 941 942 943 944 945 |
#ifdef PTRACE_SYSEMU case PTRACE_SYSEMU: case PTRACE_SYSEMU_SINGLESTEP: #endif case PTRACE_SYSCALL: case PTRACE_CONT: return ptrace_resume(child, request, data); case PTRACE_KILL: if (child->exit_state) /* already dead */ return 0; return ptrace_resume(child, request, SIGKILL); |
2225a122a
|
946 947 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: |
29000caec
|
948 |
case PTRACE_SETREGSET: { |
2225a122a
|
949 |
struct iovec kiov; |
9fed81dc4
|
950 |
struct iovec __user *uiov = datavp; |
2225a122a
|
951 952 953 954 955 956 957 958 959 960 961 962 963 964 |
if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) return -EFAULT; if (__get_user(kiov.iov_base, &uiov->iov_base) || __get_user(kiov.iov_len, &uiov->iov_len)) return -EFAULT; ret = ptrace_regset(child, request, addr, &kiov); if (!ret) ret = __put_user(kiov.iov_len, &uiov->iov_len); break; } #endif |
f8e529ed9
|
965 966 967 968 |
case PTRACE_SECCOMP_GET_FILTER: ret = seccomp_get_filter(child, addr, datavp); break; |
1da177e4c
|
969 970 971 972 973 974 |
default: break; } return ret; } |
481bed454
|
975 |
|
8053bdd5c
|
976 |
static struct task_struct *ptrace_get_task_struct(pid_t pid) |
6b9c7ed84
|
977 978 |
{ struct task_struct *child; |
481bed454
|
979 |
|
8053bdd5c
|
980 |
rcu_read_lock(); |
228ebcbe6
|
981 |
child = find_task_by_vpid(pid); |
481bed454
|
982 983 |
if (child) get_task_struct(child); |
8053bdd5c
|
984 |
rcu_read_unlock(); |
f400e198b
|
985 |
|
481bed454
|
986 |
if (!child) |
6b9c7ed84
|
987 988 |
return ERR_PTR(-ESRCH); return child; |
481bed454
|
989 |
} |
0ac155591
|
990 991 992 |
#ifndef arch_ptrace_attach #define arch_ptrace_attach(child) do { } while (0) #endif |
4abf98696
|
993 994 |
SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, unsigned long, data) |
481bed454
|
995 996 997 |
{ struct task_struct *child; long ret; |
6b9c7ed84
|
998 999 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); |
6ea6dd93c
|
1000 1001 |
if (!ret) arch_ptrace_attach(current); |
481bed454
|
1002 |
goto out; |
6b9c7ed84
|
1003 1004 1005 1006 1007 1008 1009 |
} child = ptrace_get_task_struct(pid); if (IS_ERR(child)) { ret = PTR_ERR(child); goto out; } |
481bed454
|
1010 |
|
3544d72a0
|
1011 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98
|
1012 |
ret = ptrace_attach(child, request, addr, data); |
0ac155591
|
1013 1014 1015 1016 1017 1018 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); |
005f18dfd
|
1019 |
goto out_put_task_struct; |
481bed454
|
1020 |
} |
fca26f260
|
1021 1022 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
481bed454
|
1023 1024 1025 1026 |
if (ret < 0) goto out_put_task_struct; ret = arch_ptrace(child, request, addr, data); |
9899d11f6
|
1027 1028 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); |
481bed454
|
1029 1030 1031 1032 |
out_put_task_struct: put_task_struct(child); out: |
481bed454
|
1033 1034 |
return ret; } |
766473231
|
1035 |
|
4abf98696
|
1036 1037 |
int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
766473231
|
1038 1039 1040 1041 1042 1043 1044 1045 1046 |
{ unsigned long tmp; int copied; copied = access_process_vm(tsk, addr, &tmp, sizeof(tmp), 0); if (copied != sizeof(tmp)) return -EIO; return put_user(tmp, (unsigned long __user *)data); } |
f284ce726
|
1047 |
|
4abf98696
|
1048 1049 |
int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data) |
f284ce726
|
1050 1051 1052 1053 1054 1055 |
{ int copied; copied = access_process_vm(tsk, addr, &data, sizeof(data), 1); return (copied == sizeof(data)) ? 0 : -EIO; } |
032d82d90
|
1056 |
|
96b8936a9
|
1057 |
#if defined CONFIG_COMPAT |
032d82d90
|
1058 1059 1060 1061 1062 1063 |
int compat_ptrace_request(struct task_struct *child, compat_long_t request, compat_ulong_t addr, compat_ulong_t data) { compat_ulong_t __user *datap = compat_ptr(data); compat_ulong_t word; |
e16b27816
|
1064 |
siginfo_t siginfo; |
032d82d90
|
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 |
int ret; switch (request) { case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: ret = access_process_vm(child, addr, &word, sizeof(word), 0); if (ret != sizeof(word)) ret = -EIO; else ret = put_user(word, datap); break; case PTRACE_POKETEXT: case PTRACE_POKEDATA: ret = access_process_vm(child, addr, &data, sizeof(data), 1); ret = (ret != sizeof(data) ? -EIO : 0); break; case PTRACE_GETEVENTMSG: ret = put_user((compat_ulong_t) child->ptrace_message, datap); break; |
e16b27816
|
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 |
case PTRACE_GETSIGINFO: ret = ptrace_getsiginfo(child, &siginfo); if (!ret) ret = copy_siginfo_to_user32( (struct compat_siginfo __user *) datap, &siginfo); break; case PTRACE_SETSIGINFO: memset(&siginfo, 0, sizeof siginfo); if (copy_siginfo_from_user32( &siginfo, (struct compat_siginfo __user *) datap)) ret = -EFAULT; else ret = ptrace_setsiginfo(child, &siginfo); break; |
2225a122a
|
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 |
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: case PTRACE_SETREGSET: { struct iovec kiov; struct compat_iovec __user *uiov = (struct compat_iovec __user *) datap; compat_uptr_t ptr; compat_size_t len; if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov))) return -EFAULT; if (__get_user(ptr, &uiov->iov_base) || __get_user(len, &uiov->iov_len)) return -EFAULT; kiov.iov_base = compat_ptr(ptr); kiov.iov_len = len; ret = ptrace_regset(child, request, addr, &kiov); if (!ret) ret = __put_user(kiov.iov_len, &uiov->iov_len); break; } #endif |
e16b27816
|
1128 |
|
032d82d90
|
1129 1130 1131 1132 1133 1134 |
default: ret = ptrace_request(child, request, addr, data); } return ret; } |
c269f1961
|
1135 |
|
62a6fa976
|
1136 1137 |
COMPAT_SYSCALL_DEFINE4(ptrace, compat_long_t, request, compat_long_t, pid, compat_long_t, addr, compat_long_t, data) |
c269f1961
|
1138 1139 1140 |
{ struct task_struct *child; long ret; |
c269f1961
|
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 |
if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); goto out; } child = ptrace_get_task_struct(pid); if (IS_ERR(child)) { ret = PTR_ERR(child); goto out; } |
3544d72a0
|
1151 |
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) { |
aa9147c98
|
1152 |
ret = ptrace_attach(child, request, addr, data); |
c269f1961
|
1153 1154 1155 1156 1157 1158 1159 1160 |
/* * Some architectures need to do book-keeping after * a ptrace attach. */ if (!ret) arch_ptrace_attach(child); goto out_put_task_struct; } |
fca26f260
|
1161 1162 |
ret = ptrace_check_attach(child, request == PTRACE_KILL || request == PTRACE_INTERRUPT); |
9899d11f6
|
1163 |
if (!ret) { |
c269f1961
|
1164 |
ret = compat_arch_ptrace(child, request, addr, data); |
9899d11f6
|
1165 1166 1167 |
if (ret || request != PTRACE_DETACH) ptrace_unfreeze_traced(child); } |
c269f1961
|
1168 1169 1170 1171 |
out_put_task_struct: put_task_struct(child); out: |
c269f1961
|
1172 1173 |
return ret; } |
96b8936a9
|
1174 |
#endif /* CONFIG_COMPAT */ |