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From: "Jürg Billeter" <j@bitron.ch>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Oleg Nesterov" <oleg@redhat.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Eric Biederman" <ebiederm@xmission.com>,
	linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Jürg Billeter" <j@bitron.ch>
Subject: [PATCH v3 1/2] fork: do not rely on SIGNAL_UNKILLABLE for init check
Date: Fri,  3 Aug 2018 16:40:20 +0200
Message-ID: <20180803144021.56920-1-j@bitron.ch> (raw)
In-Reply-To: <20180730075241.24002-1-j@bitron.ch>

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@bitron.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


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-30  7:52 [PATCH] prctl: add PR_[GS]ET_KILLABLE Jürg Billeter
2018-07-30 10:17 ` Oleg Nesterov
2018-07-30 19:32   ` Jürg Billeter
2018-07-30 19:39     ` Thomas Gleixner
2018-07-31  7:03 ` [PATCH v2] " Jürg Billeter
2018-07-31 14:39   ` Oleg Nesterov
2018-07-31 16:12     ` Jürg Billeter
2018-08-01 14:19       ` Oleg Nesterov
2018-08-03 10:15         ` Jürg Billeter
2018-08-03 12:14           ` Oleg Nesterov
2018-08-03 13:34           ` Eric W. Biederman
2018-08-03 14:39             ` Jürg Billeter
2018-07-31 16:26 ` [PATCH] " Jann Horn
2018-08-01  7:43   ` Jürg Billeter
2018-08-01  7:56     ` Jann Horn
2018-08-03 14:40 ` Jürg Billeter [this message]
2018-08-03 14:40   ` [PATCH v3 2/2] " Jürg Billeter
2018-09-06 22:42     ` Andrew Morton

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