fs: prepend statmount.mnt_opts string with security_sb_mnt_opts()

Currently these mount options aren't accessible via statmount().

The read handler for /proc/#/mountinfo calls security_sb_show_options()
to emit the security options after emitting superblock flag options, but
before calling sb->s_op->show_options.

Have statmount_mnt_opts() call security_sb_show_options() before
calling ->show_options.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20241115-statmount-v2-2-cd29aeff9cbb@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/namespace.c b/fs/namespace.c
index 847fa8443e8a8a6ceb8c50f09f41b0eb1453477c..1af8da8e1e97378224fa6c23dd950c327aa261a7 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -5036,6 +5036,10 @@ static int statmount_mnt_opts(struct kstatmount *s, struct seq_file *seq)
        if (sb->s_op->show_options) {
                size_t start = seq->count;
 
+               err = security_sb_show_options(seq, sb);
+               if (err)
+                       return err;
+
                err = sb->s_op->show_options(seq, mnt->mnt_root);
                if (err)
                        return err;