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()/
  ...

3 files changed, 26 insertions, 5 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 6075a1e727ae..d9576f261815 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -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);
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 9b45ee84fbcc..3a1dafd228d1 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -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);
         }
diff --git a/fs/proc/base.c b/fs/proc/base.c
index fc5bc2767692..c47719aaadef 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -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;