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Subject[PATCH 5/6][v5] Protect cinit from blocked fatal signals

From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Date: Wed, 24 Dec 2008 14:04:24 -0800
Subject: [PATCH 5/6][v5] Protect cinit from blocked fatal signals

Normally SIG_DFL signals to global and container-init are dropped early.
But if a signal is blocked when it is posted, we cannot drop the signal
since the receiver may install a handler before unblocking the signal.
Once this signal is queued however, the receiver container-init has
no way of knowing if the signal was sent from an ancestor or descendant
namespace. This patch ensures that contianer-init drops all SIG_DFL
signals in get_signal_to_deliver() except SIGKILL/SIGSTOP.

If SIGSTOP/SIGKILL originate from a descendant of container-init they
are never queued (i.e dropped in sig_ignored() in an earler patch).

If SIGSTOP/SIGKILL originate from parent namespace, the signal is queued
and container-init processes the signal.

And now that we have all pieces in place, set SIGNAL_UNKILLABLE for
container-inits.

Changelog[v5]:
- (Oleg Nesterov) Drop signal_unkillable(), simplify check in
get_signal_to_deliver() and drop check for signal_group_exit()
since it is covered by sig_kernel_only().

Changelog[v4]:
- Rename sig_unkillable() to unkillable_by_sig()
- Remove SIGNAL_UNKILLABLE_FROM_NS flag and simplify (Oleg Nesterov)
- Set SIGNAL_UNKILLABLE for container-init in this patch.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
kernel/fork.c | 2 ++
kernel/signal.c | 6 ++++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index dba2d3f..d3e93ef 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -812,6 +812,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
atomic_set(&sig->live, 1);
init_waitqueue_head(&sig->wait_chldexit);
sig->flags = 0;
+ if (clone_flags & CLONE_NEWPID)
+ sig->flags |= SIGNAL_UNKILLABLE;
sig->group_exit_code = 0;
sig->group_exit_task = NULL;
sig->group_stop_count = 0;
diff --git a/kernel/signal.c b/kernel/signal.c
index b51781e..d90b033 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1914,9 +1914,11 @@ relock:

/*
* Global init gets no signals it doesn't want.
+ * Container-init gets no signals it doesn't want from same
+ * container.
*/
- if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
- !signal_group_exit(signal))
+ if ((signal->flags & SIGNAL_UNKILLABLE) &&
+ !sig_kernel_only(signr))
continue;

if (sig_kernel_stop(signr)) {
--
1.5.2.5


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