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Commit 06d98473 authored by Tejun Heo's avatar Tejun Heo Committed by Oleg Nesterov
Browse files

ptrace: s/tracehook_tracer_task()/ptrace_parent()/ 



tracehook.h is on the way out.  Rename tracehook_tracer_task() to
ptrace_parent() and move it from tracehook.h to ptrace.h.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
parent 4b9d33e6

fs/proc/array.c

+1 −1
Original line number Diff line number Diff line
@@ -172,7 +172,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 
		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;

	tpid = 0;

	if (pid_alive(p)) {

		struct task_struct *tracer = tracehook_tracer_task(p);

		struct task_struct *tracer = ptrace_parent(p);

		if (tracer)

			tpid = task_pid_nr_ns(tracer, ns);

	}

fs/proc/base.c

+1 −1
Original line number Diff line number Diff line
@@ -216,7 +216,7 @@ static struct mm_struct *__check_mem_permission(struct task_struct *task) 
	if (task_is_stopped_or_traced(task)) {

		int match;

		rcu_read_lock();

		match = (tracehook_tracer_task(task) == current);

		match = (ptrace_parent(task) == current);

		rcu_read_unlock();

		if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))

			return mm;

include/linux/ptrace.h

+18 −0
Original line number Diff line number Diff line
@@ -150,6 +150,24 @@ int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, 
int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,

			    unsigned long data);



/**

 * ptrace_parent - return the task that is tracing the given task

 * @task: 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 check_unsafe_exec() was called.

 */

static inline struct task_struct *ptrace_parent(struct task_struct *task)

{

	if (unlikely(task->ptrace))

		return rcu_dereference(task->parent);

	return NULL;

}



/**

 * ptrace_event_enabled - test whether a ptrace event is enabled

 * @task: ptracee of interest

include/linux/tracehook.h

+0 −18
Original line number Diff line number Diff line
@@ -129,24 +129,6 @@ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step) 
	ptrace_report_syscall(regs);

}



/**

 * 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 (tsk->ptrace & PT_PTRACED)

		return rcu_dereference(tsk->parent);

	return NULL;

}



/**

 * tracehook_signal_handler - signal handler setup is complete

 * @sig:		number of signal being delivered

security/apparmor/domain.c

+1 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ static int may_change_ptraced_domain(struct task_struct *task, 
	int error = 0;



	rcu_read_lock();

	tracer = tracehook_tracer_task(task);

	tracer = ptrace_parent(task);

	if (tracer) {

		/* released below */

		cred = get_task_cred(tracer);