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Subject[PATCH 2/6] exit: reparent: fix the cross-namespace PR_SET_CHILD_SUBREAPER reparenting
find_new_reaper() assumes that "has_child_subreaper" logic is safe as
long as we are not the exiting ->child_reaper and this is doubly wrong:

1. In fact it is safe if "pid_ns->child_reaper == father"; there must
be no children after zap_pid_ns_processes() returns, so it doesn't
matter what we return in this case and even pid_ns->child_reaper is
wrong otherwise: we can't reparent to ->child_reaper == current.

This is not a bug, but this is confusing.

2. It is not safe if we are not pid_ns->child_reaper but from the same
thread group. We drop tasklist_lock before zap_pid_ns_processes(),
so another thread can lock it and choose the new reaper from the
upper namespace if has_child_subreaper == T, and this is obviously
wrong.

This is not that bad, zap_pid_ns_processes() won't return until the
the new reaper reaps all zombies, but this should be fixed anyway.

We could change for_each_thread() loop to use ->exit_state instead of
PF_EXITING which we had to use until 8aac62706ada, or we could change
copy_signal() to check CLONE_NEWPID before setting has_child_subreaper,
but lets change this code so that it is clear we can't look outside of
our namespace, otherwise same_thread_group(reaper, child_reaper) check
will look wrong and confusing anyway.

We can simply start from "father" and fix the problem. We can't wrongly
return a thread from the same thread group if ->is_child_subreaper == T,
we know that all threads have PF_EXITING set.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/exit.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 31da440..9ade2f5 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -492,7 +492,9 @@ static struct task_struct *find_new_reaper(struct task_struct *father)

zap_pid_ns_processes(pid_ns);
write_lock_irq(&tasklist_lock);
- } else if (father->signal->has_child_subreaper) {
+ }
+
+ if (father->signal->has_child_subreaper) {
struct task_struct *reaper;

/*
@@ -502,7 +504,7 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
* PID namespace. However we still need the check above, see
* http://marc.info/?l=linux-kernel&m=131385460420380
*/
- for (reaper = father->real_parent;
+ for (reaper = father;
reaper != &init_task;
reaper = reaper->real_parent) {
if (same_thread_group(reaper, pid_ns->child_reaper))
--
1.5.5.1


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