linux-kernel - [PATCH v3 1/2] fork: do not rely on SIGNAL

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Message-Id: <20180803144021.56920-1-j@bitron.ch>
Date:   Fri,  3 Aug 2018 16:40:20 +0200
From:   Jürg Billeter <j@...ron.ch>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eric Biederman <ebiederm@...ssion.com>,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jürg Billeter <j@...ron.ch>
Subject: [PATCH v3 1/2] fork: do not rely on SIGNAL_UNKILLABLE for init check

copy_process() currently checks the SIGNAL_UNKILLABLE flag to determine
whether to accept CLONE_PARENT. In preparation for allowing init
processes to opt out of SIGNAL_UNKILLABLE, directly check whether the
process is an init process with is_child_reaper().

Signed-off-by: Jürg Billeter <j@...ron.ch>
---
 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 1b27babc4c78..c019ce461556 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1646,7 +1646,7 @@ static __latent_entropy struct task_struct *copy_process(
 	 * from creating siblings.
 	 */
 	if ((clone_flags & CLONE_PARENT) &&
-				current->signal->flags & SIGNAL_UNKILLABLE)
+				is_child_reaper(task_tgid(current)))
 		return ERR_PTR(-EINVAL);
 
 	/*
-- 
2.18.0