Commit 8209f53d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc 

* 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc: (39 commits)
  ptrace: do_wait(traced_leader_killed_by_mt_exec) can block forever
  ptrace: fix ptrace_signal() && STOP_DEQUEUED interaction
  connector: add an event for monitoring process tracers
  ptrace: dont send SIGSTOP on auto-attach if PT_SEIZED
  ptrace: mv send-SIGSTOP from do_fork() to ptrace_init_task()
  ptrace_init_task: initialize child->jobctl explicitly
  has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/
  ptrace: make former thread ID available via PTRACE_GETEVENTMSG after PTRACE_EVENT_EXEC stop
  ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/
  ptrace: kill real_parent_is_ptracer() in in favor of ptrace_reparented()
  ptrace: ptrace_reparented() should check same_thread_group()
  redefine thread_group_leader() as exit_signal >= 0
  do not change dead_task->exit_signal
  kill task_detached()
  reparent_leader: check EXIT_DEAD instead of task_detached()
  make do_notify_parent() __must_check, update the callers
  __ptrace_detach: avoid task_detached(), check do_notify_parent()
  kill tracehook_notify_death()
  make do_notify_parent() return bool
  ptrace: s/tracehook_tracer_task()/ptrace_parent()/
  ...
parents 22a3b977 eac1b5e5

arch/s390/kernel/traps.c

+2 −2
Original line number Diff line number Diff line
@@ -331,7 +331,7 @@ void __kprobes do_per_trap(struct pt_regs *regs) 
{

	if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)

		return;

	if (tracehook_consider_fatal_signal(current, SIGTRAP))

	if (current->ptrace)

		force_sig(SIGTRAP, current);

}
@@ -425,7 +425,7 @@ static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code, 
		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))

			return;

		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {

			if (tracehook_consider_fatal_signal(current, SIGTRAP))

			if (current->ptrace)

				force_sig(SIGTRAP, current);

			else

				signal = SIGILL;

drivers/connector/cn_proc.c

+35 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/init.h>

#include <linux/connector.h>

#include <linux/gfp.h>

#include <linux/ptrace.h>

#include <asm/atomic.h>

#include <asm/unaligned.h>
@@ -166,6 +167,40 @@ void proc_sid_connector(struct task_struct *task) 
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);

}



void proc_ptrace_connector(struct task_struct *task, int ptrace_id)

{

	struct cn_msg *msg;

	struct proc_event *ev;

	struct timespec ts;

	__u8 buffer[CN_PROC_MSG_SIZE];

	struct task_struct *tracer;



	if (atomic_read(&proc_event_num_listeners) < 1)

		return;



	msg = (struct cn_msg *)buffer;

	ev = (struct proc_event *)msg->data;

	get_seq(&msg->seq, &ev->cpu);

	ktime_get_ts(&ts); /* get high res monotonic timestamp */

	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);

	ev->what = PROC_EVENT_PTRACE;

	ev->event_data.ptrace.process_pid  = task->pid;

	ev->event_data.ptrace.process_tgid = task->tgid;

	if (ptrace_id == PTRACE_ATTACH) {

		ev->event_data.ptrace.tracer_pid  = current->pid;

		ev->event_data.ptrace.tracer_tgid = current->tgid;

	} else if (ptrace_id == PTRACE_DETACH) {

		ev->event_data.ptrace.tracer_pid  = 0;

		ev->event_data.ptrace.tracer_tgid = 0;

	} else

		return;



	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));

	msg->ack = 0; /* not used */

	msg->len = sizeof(*ev);

	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);

}



void proc_exit_connector(struct task_struct *task)

{

	struct cn_msg *msg;

fs/exec.c

+24 −3
Original line number Diff line number Diff line
@@ -963,9 +963,18 @@ static int de_thread(struct task_struct *tsk) 
		leader->group_leader = tsk;



		tsk->exit_signal = SIGCHLD;

		leader->exit_signal = -1;



		BUG_ON(leader->exit_state != EXIT_ZOMBIE);

		leader->exit_state = EXIT_DEAD;



		/*

		 * We are going to release_task()->ptrace_unlink() silently,

		 * the tracer can sleep in do_wait(). EXIT_DEAD guarantees

		 * the tracer wont't block again waiting for this thread.

		 */

		if (unlikely(leader->ptrace))

			__wake_up_parent(leader, leader->parent);

		write_unlock_irq(&tasklist_lock);



		release_task(leader);
@@ -1225,7 +1234,12 @@ int check_unsafe_exec(struct linux_binprm *bprm) 
	unsigned n_fs;

	int res = 0;



	bprm->unsafe = tracehook_unsafe_exec(p);

	if (p->ptrace) {

		if (p->ptrace & PT_PTRACE_CAP)

			bprm->unsafe |= LSM_UNSAFE_PTRACE_CAP;

		else

			bprm->unsafe |= LSM_UNSAFE_PTRACE;

	}



	n_fs = 1;

	spin_lock(&p->fs->lock);
@@ -1353,6 +1367,7 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) 
	unsigned int depth = bprm->recursion_depth;

	int try,retval;

	struct linux_binfmt *fmt;

	pid_t old_pid;



	retval = security_bprm_check(bprm);

	if (retval)
@@ -1362,6 +1377,11 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) 
	if (retval)

		return retval;



	/* Need to fetch pid before load_binary changes it */

	rcu_read_lock();

	old_pid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));

	rcu_read_unlock();



	retval = -ENOENT;

	for (try=0; try<2; try++) {

		read_lock(&binfmt_lock);
@@ -1381,7 +1401,8 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) 
			bprm->recursion_depth = depth;

			if (retval >= 0) {

				if (depth == 0)

					tracehook_report_exec(fmt, bprm, regs);

					ptrace_event(PTRACE_EVENT_EXEC,

							old_pid);

				put_binfmt(fmt);

				allow_write_access(bprm->file);

				if (bprm->file)
@@ -1769,7 +1790,7 @@ static int zap_process(struct task_struct *start, int exit_code) 


	t = start;

	do {

		task_clear_group_stop_pending(t);

		task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);

		if (t != current && t->mm) {

			sigaddset(&t->pending.signal, SIGKILL);

			signal_wake_up(t, 1);

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;

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