Commit 667b6094 authored Feb 06, 2018 by Marcos Paulo de Souza Committed by Linus Torvalds Feb 06, 2018

kernel/fork.c: add comment about usage of CLONE_FS flags and namespaces

All other places that deals with namespaces have an explanation of why
the restriction is there.

The description added in this commit was based on commit e66eded8
("userns: Don't allow CLONE_NEWUSER | CLONE_FS").

Link: http://lkml.kernel.org/r/20171112151637.13258-1-marcos.souza.org@gmail.com


Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 9f5325aa

kernel/fork.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1587,6 +1587,10 @@ static __latent_entropy struct task_struct *copy_process(
		int retval;
		struct task_struct *p;

		/*
		* Don't allow sharing the root directory with processes in a different
		* namespace
		*/
		if ((clone_flags & (CLONE_NEWNS\|CLONE_FS)) == (CLONE_NEWNS\|CLONE_FS))
		return ERR_PTR(-EINVAL);