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

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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 e66eded8309e
("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>
This commit is contained in:
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);