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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 e66eded830
("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>
hifive-unleashed-5.1
Marcos Paulo de Souza 2018-02-06 15:39:34 -08:00 committed by Linus Torvalds
parent 9f5325aa37
commit 667b60946e
1 changed files with 4 additions and 0 deletions
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kernel/fork.c
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@ -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);