[PATCH v2 2/2] fs: prepend statmount.mnt_opts string with security_sb_mnt_opts()

[Jeff Layton <jlayton@kernel.org>]

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>
---
 fs/namespace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 206fc54feeba3e782f49778bcc99774d5a9d50a4..aae04aa10f984c69090bd1017112be17aa709d0c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -5055,6 +5055,10 @@ 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;

-- 
2.47.0