linux-kernel - [PATCH v39 34/42] LSM: Add mount opts blob size tracking

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Message-ID: <20231215221636.105680-35-casey@schaufler-ca.com>
Date: Fri, 15 Dec 2023 14:16:28 -0800
From: Casey Schaufler <casey@...aufler-ca.com>
To: casey@...aufler-ca.com,
	paul@...l-moore.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,
	mic@...ikod.net
Subject: [PATCH v39 34/42] 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 4deb1a4d2d1a..59085248809a 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -81,6 +81,7 @@ struct lsm_blob_sizes {
 	int	lbs_msg_msg;
 	int	lbs_task;
 	int	lbs_xattr_count; /* number of xattr slots in new_xattrs array */
+	int	lbs_mnt_opts;
 	bool	lbs_secmark;	/* expressed desire for secmark use */
 };
 
diff --git a/security/security.c b/security/security.c
index 8576121fadb9..fd429f67d2da 100644
--- a/security/security.c
+++ b/security/security.c
@@ -232,6 +232,7 @@ static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
 	lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
 	lsm_set_blob_size(&needed->lbs_xattr_count,
 			  &blob_sizes.lbs_xattr_count);
+	lsm_set_blob_size(&needed->lbs_mnt_opts, &blob_sizes.lbs_mnt_opts);
 	if (needed->lbs_secmark) {
 		if (!blob_sizes.lbs_secmark)
 			blob_sizes.lbs_secmark = true;
@@ -453,6 +454,7 @@ static void __init ordered_lsm_init(void)
 	init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
 	init_debug("task blob size       = %d\n", blob_sizes.lbs_task);
 	init_debug("xattr slots          = %d\n", blob_sizes.lbs_xattr_count);
+	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 3e590f632f59..e0f6f2093708 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6970,6 +6970,7 @@ struct lsm_blob_sizes selinux_blob_sizes __ro_after_init = {
 	.lbs_sock = sizeof(struct sk_security_struct),
 	.lbs_superblock = sizeof(struct superblock_security_struct),
 	.lbs_xattr_count = SELINUX_INODE_INIT_XATTRS,
+	.lbs_mnt_opts = sizeof(struct selinux_mnt_opts),
 	.lbs_secmark = true,
 };
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index c93e81facf1b..573d5bffb9e1 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -5064,6 +5064,7 @@ 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),
 	.lbs_secmark = true,
 };
 
-- 
2.41.0