[PATCH] proc: set a proper user namespace for fs_context

[Andrei Vagin]

A user namespace should be taken from a pidns for which a procfs is created.

Signed-off-by: Andrei Vagin <avagin@xxxxxxxxxx>
---
 fs/proc/root.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/proc/root.c b/fs/proc/root.c
index efbdc08a3c86..59aaf06a40c7 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -303,6 +303,11 @@ int pid_ns_prepare_proc(struct pid_namespace *ns)
 	if (IS_ERR(fc))
 		return PTR_ERR(fc);
 
+	if (fc->user_ns != ns->user_ns) {
+		put_user_ns(fc->user_ns);
+		fc->user_ns = get_user_ns(ns->user_ns);
+	}
+
 	ctx = fc->fs_private;
 	if (ctx->pid_ns != ns) {
 		put_pid_ns(ctx->pid_ns);
-- 
2.17.0


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