[Devel] [PATCH vz10 1/2] fs: prepend statmount.mnt_opts string with security_sb_mnt_opts()

[Eva Kurchatova]

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

(cherry picked from commit 056d33137bf9364456ee70aa265ccbb948daee49)
Signed-off-by: Eva Kurchatova <eva.kurchatova at virtuozzo.com>

https://virtuozzo.atlassian.net/browse/VSTOR-132443
Feature: Fix selftests
---
 fs/namespace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index d18aaba94131..8f8161a555a6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -5307,6 +5307,10 @@ 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;
-- 
2.54.0