diff mbox series

[6/6] proc: Set correct userns for new proc super created by a new pid_namespace

Message ID 153484533695.1183.7796797839895873922.stgit@warthog.procyon.org.uk (mailing list archive)
State New, archived
Headers show
Series [1/6] vfs: Fix vfs_dup_fs_context() | expand

Commit Message

David Howells Aug. 21, 2018, 9:55 a.m. UTC 
From: Andrei Vagin <avagin@openvz.org>

Fix the setting up a new proc superblock for a new pid_namespace such that
the user_ns for that proc superblock needs to be taken from the new
pid_namespace and not the active process.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/proc/root.c |    5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/fs/proc/root.c b/fs/proc/root.c
index 1d6e5bfa30cc..1419b48a89ab 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -315,6 +315,11 @@  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);