linux-kernel - [PATCH v2 1/2] LSM: Add mount opts blob size tracking

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Message-ID: <20250925171208.5997-2-casey@schaufler-ca.com>
Date: Thu, 25 Sep 2025 10:12:07 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: casey@...aufler-ca.com,
	paul@...l-moore.com,
	eparis@...hat.com,
	linux-security-module@...r.kernel.org
Cc: jmorris@...ei.org,
	serge@...lyn.com,
	keescook@...omium.org,
	john.johansen@...onical.com,
	penguin-kernel@...ove.sakura.ne.jp,
	stephen.smalley.work@...il.com,
	linux-kernel@...r.kernel.org,
	selinux@...r.kernel.org
Subject: [PATCH v2 1/2] LSM: Add mount opts blob size tracking

Add mount option data to the blob size accounting in anticipation
of using a shared mnt_opts blob.

Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
---
 include/linux/lsm_hooks.h  | 1 +
 security/security.c        | 2 ++
 security/selinux/hooks.c   | 1 +
 security/smack/smack_lsm.c | 1 +
 4 files changed, 5 insertions(+)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 090d1d3e19fe..0de143d7c094 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -116,6 +116,7 @@ struct lsm_blob_sizes {
 	int lbs_xattr_count; /* number of xattr slots in new_xattrs array */
 	int lbs_tun_dev;
 	int lbs_bdev;
+	int lbs_mnt_opts;
 };
 
 /*
diff --git a/security/security.c b/security/security.c
index ad163f06bf7a..8390410aec91 100644
--- a/security/security.c
+++ b/security/security.c
@@ -283,6 +283,7 @@ static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
 	lsm_set_blob_size(&needed->lbs_xattr_count,
 			  &blob_sizes.lbs_xattr_count);
 	lsm_set_blob_size(&needed->lbs_bdev, &blob_sizes.lbs_bdev);
+	lsm_set_blob_size(&needed->lbs_mnt_opts, &blob_sizes.lbs_mnt_opts);
 }
 
 /* Prepare LSM for initialization. */
@@ -480,6 +481,7 @@ static void __init ordered_lsm_init(void)
 	init_debug("tun device blob size = %d\n", blob_sizes.lbs_tun_dev);
 	init_debug("xattr slots          = %d\n", blob_sizes.lbs_xattr_count);
 	init_debug("bdev blob size       = %d\n", blob_sizes.lbs_bdev);
+	init_debug("mnt_opts blob size   = %d\n", blob_sizes.lbs_mnt_opts);
 
 	/*
 	 * Create any kmem_caches needed for blobs
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c95a5874bf7d..4bba9d119713 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7183,6 +7183,7 @@ struct lsm_blob_sizes selinux_blob_sizes __ro_after_init = {
 	.lbs_xattr_count = SELINUX_INODE_INIT_XATTRS,
 	.lbs_tun_dev = sizeof(struct tun_security_struct),
 	.lbs_ib = sizeof(struct ib_security_struct),
+	.lbs_mnt_opts = sizeof(struct selinux_mnt_opts),
 };
 
 #ifdef CONFIG_PERF_EVENTS
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index fc340a6f0dde..1f236014e7d8 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -5030,6 +5030,7 @@ struct lsm_blob_sizes smack_blob_sizes __ro_after_init = {
 	.lbs_sock = sizeof(struct socket_smack),
 	.lbs_superblock = sizeof(struct superblock_smack),
 	.lbs_xattr_count = SMACK_INODE_INIT_XATTRS,
+	.lbs_mnt_opts = sizeof(struct smack_mnt_opts),
 };
 
 static const struct lsm_id smack_lsmid = {
-- 
2.51.0