[PATCH v3 21/38] af_unix: handle idmapped mounts

[Christian Brauner]

When binding a non-abstract AF_UNIX socket it will gain a representation in the
filesystem. Enable the socket infrastructure to handle idmapped mounts by
passing down the user namespace of the mount the socket will be created from. If
the initial user namespace is passed nothing changes so non-idmapped mounts will
see identical behavior as before.

Cc: Christoph Hellwig <hch at lst.de>
Cc: David Howells <dhowells at redhat.com>
Cc: Al Viro <viro at zeniv.linux.org.uk>
Cc: linux-fsdevel at vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
---
/* v2 */
unchanged

/* v3 */
unchanged
---
 net/unix/af_unix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index b4987805e5e5..4be33240e9cc 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -996,7 +996,7 @@ static int unix_mknod(const char *sun_path, umode_t mode, struct path *res)
 	 */
 	err = security_path_mknod(&path, dentry, mode, 0);
 	if (!err) {
-		err = vfs_mknod(&init_user_ns, d_inode(path.dentry), dentry, mode, 0);
+		err = vfs_mknod(mnt_user_ns(path.mnt), d_inode(path.dentry), dentry, mode, 0);
 		if (!err) {
 			res->mnt = mntget(path.mnt);
 			res->dentry = dget(dentry);
-- 
2.29.2