#include <linux/security.h>
struct linux_binprm;
-/**
- * tracehook_expect_breakpoints - guess if task memory might be touched
- * @task: current task, making a new mapping
- *
- * Return nonzero if @task is expected to want breakpoint insertion in
- * its memory at some point. A zero return is no guarantee it won't
- * be done, but this is a hint that it's known to be likely.
- *
- * May be called with @task->mm->mmap_sem held for writing.
- */
-static inline int tracehook_expect_breakpoints(struct task_struct *task)
-{
- return (task_ptrace(task) & PT_PTRACED) != 0;
-}
-
/*
* ptrace report for syscall entry and exit looks identical.
*/
static inline void ptrace_report_syscall(struct pt_regs *regs)
{
- int ptrace = task_ptrace(current);
+ int ptrace = current->ptrace;
if (!(ptrace & PT_PTRACED))
return;
ptrace_report_syscall(regs);
}
-/**
- * tracehook_unsafe_exec - check for exec declared unsafe due to tracing
- * @task: current task doing exec
- *
- * Return %LSM_UNSAFE_* bits applied to an exec because of tracing.
- *
- * @task->signal->cred_guard_mutex is held by the caller through the do_execve().
- */
-static inline int tracehook_unsafe_exec(struct task_struct *task)
-{
- int unsafe = 0;
- int ptrace = task_ptrace(task);
- if (ptrace & PT_PTRACED) {
- if (ptrace & PT_PTRACE_CAP)
- unsafe |= LSM_UNSAFE_PTRACE_CAP;
- else
- unsafe |= LSM_UNSAFE_PTRACE;
- }
- return unsafe;
-}
-
-/**
- * tracehook_tracer_task - return the task that is tracing the given task
- * @tsk: task to consider
- *
- * Returns NULL if no one is tracing @task, or the &struct task_struct
- * pointer to its tracer.
- *
- * Must called under rcu_read_lock(). The pointer returned might be kept
- * live only by RCU. During exec, this may be called with task_lock()
- * held on @task, still held from when tracehook_unsafe_exec() was called.
- */
-static inline struct task_struct *tracehook_tracer_task(struct task_struct *tsk)
-{
- if (task_ptrace(tsk) & PT_PTRACED)
- return rcu_dereference(tsk->parent);
- return NULL;
-}
-
-/**
- * tracehook_report_exec - a successful exec was completed
- * @fmt: &struct linux_binfmt that performed the exec
- * @bprm: &struct linux_binprm containing exec details
- * @regs: user-mode register state
- *
- * An exec just completed, we are shortly going to return to user mode.
- * The freshly initialized register state can be seen and changed in @regs.
- * The name, file and other pointers in @bprm are still on hand to be
- * inspected, but will be freed as soon as this returns.
- *
- * Called with no locks, but with some kernel resources held live
- * and a reference on @fmt->module.
- */
-static inline void tracehook_report_exec(struct linux_binfmt *fmt,
- struct linux_binprm *bprm,
- struct pt_regs *regs)
-{
- if (!ptrace_event(PT_TRACE_EXEC, PTRACE_EVENT_EXEC, 0) &&
- unlikely(task_ptrace(current) & PT_PTRACED))
- send_sig(SIGTRAP, current, 0);
-}
-
-/**
- * tracehook_report_exit - task has begun to exit
- * @exit_code: pointer to value destined for @current->exit_code
- *
- * @exit_code points to the value passed to do_exit(), which tracing
- * might change here. This is almost the first thing in do_exit(),
- * before freeing any resources or setting the %PF_EXITING flag.
- *
- * Called with no locks held.
- */
-static inline void tracehook_report_exit(long *exit_code)
-{
- ptrace_event(PT_TRACE_EXIT, PTRACE_EVENT_EXIT, *exit_code);
-}
-
-/**
- * tracehook_prepare_clone - prepare for new child to be cloned
- * @clone_flags: %CLONE_* flags from clone/fork/vfork system call
- *
- * This is called before a new user task is to be cloned.
- * Its return value will be passed to tracehook_finish_clone().
- *
- * Called with no locks held.
- */
-static inline int tracehook_prepare_clone(unsigned clone_flags)
-{
- if (clone_flags & CLONE_UNTRACED)
- return 0;
-
- if (clone_flags & CLONE_VFORK) {
- if (current->ptrace & PT_TRACE_VFORK)
- return PTRACE_EVENT_VFORK;
- } else if ((clone_flags & CSIGNAL) != SIGCHLD) {
- if (current->ptrace & PT_TRACE_CLONE)
- return PTRACE_EVENT_CLONE;
- } else if (current->ptrace & PT_TRACE_FORK)
- return PTRACE_EVENT_FORK;
-
- return 0;
-}
-
-/**
- * tracehook_finish_clone - new child created and being attached
- * @child: new child task
- * @clone_flags: %CLONE_* flags from clone/fork/vfork system call
- * @trace: return value from tracehook_prepare_clone()
- *
- * This is called immediately after adding @child to its parent's children list.
- * The @trace value is that returned by tracehook_prepare_clone().
- *
- * Called with current's siglock and write_lock_irq(&tasklist_lock) held.
- */
-static inline void tracehook_finish_clone(struct task_struct *child,
- unsigned long clone_flags, int trace)
-{
- ptrace_init_task(child, (clone_flags & CLONE_PTRACE) || trace);
-}
-
-/**
- * tracehook_report_clone - in parent, new child is about to start running
- * @regs: parent's user register state
- * @clone_flags: flags from parent's system call
- * @pid: new child's PID in the parent's namespace
- * @child: new child task
- *
- * Called after a child is set up, but before it has been started running.
- * This is not a good place to block, because the child has not started
- * yet. Suspend the child here if desired, and then block in
- * tracehook_report_clone_complete(). This must prevent the child from
- * self-reaping if tracehook_report_clone_complete() uses the @child
- * pointer; otherwise it might have died and been released by the time
- * tracehook_report_clone_complete() is called.
- *
- * Called with no locks held, but the child cannot run until this returns.
- */
-static inline void tracehook_report_clone(struct pt_regs *regs,
- unsigned long clone_flags,
- pid_t pid, struct task_struct *child)
-{
- if (unlikely(task_ptrace(child))) {
- /*
- * It doesn't matter who attached/attaching to this
- * task, the pending SIGSTOP is right in any case.
- */
- sigaddset(&child->pending.signal, SIGSTOP);
- set_tsk_thread_flag(child, TIF_SIGPENDING);
- }
-}
-
-/**
- * tracehook_report_clone_complete - new child is running
- * @trace: return value from tracehook_prepare_clone()
- * @regs: parent's user register state
- * @clone_flags: flags from parent's system call
- * @pid: new child's PID in the parent's namespace
- * @child: child task, already running
- *
- * This is called just after the child has started running. This is
- * just before the clone/fork syscall returns, or blocks for vfork
- * child completion if @clone_flags has the %CLONE_VFORK bit set.
- * The @child pointer may be invalid if a self-reaping child died and
- * tracehook_report_clone() took no action to prevent it from self-reaping.
- *
- * Called with no locks held.
- */
-static inline void tracehook_report_clone_complete(int trace,
- struct pt_regs *regs,
- unsigned long clone_flags,
- pid_t pid,
- struct task_struct *child)
-{
- if (unlikely(trace))
- ptrace_event(0, trace, pid);
-}
-
-/**
- * tracehook_report_vfork_done - vfork parent's child has exited or exec'd
- * @child: child task, already running
- * @pid: new child's PID in the parent's namespace
- *
- * Called after a %CLONE_VFORK parent has waited for the child to complete.
- * The clone/vfork system call will return immediately after this.
- * The @child pointer may be invalid if a self-reaping child died and
- * tracehook_report_clone() took no action to prevent it from self-reaping.
- *
- * Called with no locks held.
- */
-static inline void tracehook_report_vfork_done(struct task_struct *child,
- pid_t pid)
-{
- ptrace_event(PT_TRACE_VFORK_DONE, PTRACE_EVENT_VFORK_DONE, pid);
-}
-
-/**
- * tracehook_prepare_release_task - task is being reaped, clean up tracing
- * @task: task in %EXIT_DEAD state
- *
- * This is called in release_task() just before @task gets finally reaped
- * and freed. This would be the ideal place to remove and clean up any
- * tracing-related state for @task.
- *
- * Called with no locks held.
- */
-static inline void tracehook_prepare_release_task(struct task_struct *task)
-{
-}
-
-/**
- * tracehook_finish_release_task - final tracing clean-up
- * @task: task in %EXIT_DEAD state
- *
- * This is called in release_task() when @task is being in the middle of
- * being reaped. After this, there must be no tracing entanglements.
- *
- * Called with write_lock_irq(&tasklist_lock) held.
- */
-static inline void tracehook_finish_release_task(struct task_struct *task)
-{
- ptrace_release_task(task);
-}
-
/**
* tracehook_signal_handler - signal handler setup is complete
* @sig: number of signal being delivered
ptrace_notify(SIGTRAP);
}
-/**
- * tracehook_consider_ignored_signal - suppress short-circuit of ignored signal
- * @task: task receiving the signal
- * @sig: signal number being sent
- *
- * Return zero iff tracing doesn't care to examine this ignored signal,
- * so it can short-circuit normal delivery and never even get queued.
- *
- * Called with @task->sighand->siglock held.
- */
-static inline int tracehook_consider_ignored_signal(struct task_struct *task,
- int sig)
-{
- return (task_ptrace(task) & PT_PTRACED) != 0;
-}
-
-/**
- * tracehook_consider_fatal_signal - suppress special handling of fatal signal
- * @task: task receiving the signal
- * @sig: signal number being sent
- *
- * Return nonzero to prevent special handling of this termination signal.
- * Normally handler for signal is %SIG_DFL. It can be %SIG_IGN if @sig is
- * ignored, in which case force_sig() is about to reset it to %SIG_DFL.
- * When this returns zero, this signal might cause a quick termination
- * that does not give the debugger a chance to intercept the signal.
- *
- * Called with or without @task->sighand->siglock held.
- */
-static inline int tracehook_consider_fatal_signal(struct task_struct *task,
- int sig)
-{
- return (task_ptrace(task) & PT_PTRACED) != 0;
-}
-
-/**
- * tracehook_force_sigpending - let tracing force signal_pending(current) on
- *
- * Called when recomputing our signal_pending() flag. Return nonzero
- * to force the signal_pending() flag on, so that tracehook_get_signal()
- * will be called before the next return to user mode.
- *
- * Called with @current->sighand->siglock held.
- */
-static inline int tracehook_force_sigpending(void)
-{
- return 0;
-}
-
-/**
- * tracehook_get_signal - deliver synthetic signal to traced task
- * @task: @current
- * @regs: task_pt_regs(@current)
- * @info: details of synthetic signal
- * @return_ka: sigaction for synthetic signal
- *
- * Return zero to check for a real pending signal normally.
- * Return -1 after releasing the siglock to repeat the check.
- * Return a signal number to induce an artificial signal delivery,
- * setting *@info and *@return_ka to specify its details and behavior.
- *
- * The @return_ka->sa_handler value controls the disposition of the
- * signal, no matter the signal number. For %SIG_DFL, the return value
- * is a representative signal to indicate the behavior (e.g. %SIGTERM
- * for death, %SIGQUIT for core dump, %SIGSTOP for job control stop,
- * %SIGTSTP for stop unless in an orphaned pgrp), but the signal number
- * reported will be @info->si_signo instead.
- *
- * Called with @task->sighand->siglock held, before dequeuing pending signals.
- */
-static inline int tracehook_get_signal(struct task_struct *task,
- struct pt_regs *regs,
- siginfo_t *info,
- struct k_sigaction *return_ka)
-{
- return 0;
-}
-
-/**
- * tracehook_finish_jctl - report about return from job control stop
- *
- * This is called by do_signal_stop() after wakeup.
- */
-static inline void tracehook_finish_jctl(void)
-{
-}
-
-#define DEATH_REAP -1
-#define DEATH_DELAYED_GROUP_LEADER -2
-
-/**
- * tracehook_notify_death - task is dead, ready to notify parent
- * @task: @current task now exiting
- * @death_cookie: value to pass to tracehook_report_death()
- * @group_dead: nonzero if this was the last thread in the group to die
- *
- * A return value >= 0 means call do_notify_parent() with that signal
- * number. Negative return value can be %DEATH_REAP to self-reap right
- * now, or %DEATH_DELAYED_GROUP_LEADER to a zombie without notifying our
- * parent. Note that a return value of 0 means a do_notify_parent() call
- * that sends no signal, but still wakes up a parent blocked in wait*().
- *
- * Called with write_lock_irq(&tasklist_lock) held.
- */
-static inline int tracehook_notify_death(struct task_struct *task,
- void **death_cookie, int group_dead)
-{
- if (task_detached(task))
- return task->ptrace ? SIGCHLD : DEATH_REAP;
-
- /*
- * If something other than our normal parent is ptracing us, then
- * send it a SIGCHLD instead of honoring exit_signal. exit_signal
- * only has special meaning to our real parent.
- */
- if (thread_group_empty(task) && !ptrace_reparented(task))
- return task->exit_signal;
-
- return task->ptrace ? SIGCHLD : DEATH_DELAYED_GROUP_LEADER;
-}
-
-/**
- * tracehook_report_death - task is dead and ready to be reaped
- * @task: @current task now exiting
- * @signal: return value from tracheook_notify_death()
- * @death_cookie: value passed back from tracehook_notify_death()
- * @group_dead: nonzero if this was the last thread in the group to die
- *
- * Thread has just become a zombie or is about to self-reap. If positive,
- * @signal is the signal number just sent to the parent (usually %SIGCHLD).
- * If @signal is %DEATH_REAP, this thread will self-reap. If @signal is
- * %DEATH_DELAYED_GROUP_LEADER, this is a delayed_group_leader() zombie.
- * The @death_cookie was passed back by tracehook_notify_death().
- *
- * If normal reaping is not inhibited, @task->exit_state might be changing
- * in parallel.
- *
- * Called without locks.
- */
-static inline void tracehook_report_death(struct task_struct *task,
- int signal, void *death_cookie,
- int group_dead)
-{
-}
-
#ifdef TIF_NOTIFY_RESUME
/**
* set_notify_resume - cause tracehook_notify_resume() to be called
projects / firefly-linux-kernel-4.4.55.git / blobdiff