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authorMarcos Paulo de Souza <marcos.souza.org@gmail.com>2018-02-06 15:39:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-06 18:32:45 -0800
commit667b60946ef9b8375085c7b225229923c6f87308 (patch)
tree23584580585c649e5f8d7a4a629625d621b38e54 /kernel
parent9f5325aa37279d724e064d32a95e13231c0ade23 (diff)
downloadlwn-667b60946ef9b8375085c7b225229923c6f87308.tar.gz
lwn-667b60946ef9b8375085c7b225229923c6f87308.zip
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 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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 0d62524c6660..b9d857fe2a5c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -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);