[v7,08/16] LSM: Infrastructure security blobs for mount options
diff mbox series

Message ID 20190807224245.10798-10-casey@schaufler-ca.com
State Superseded
Headers show
Series
  • LSM: Full module stacking
Related show

Commit Message

Casey Schaufler Aug. 7, 2019, 10:42 p.m. UTC
Manage LSM data for mount options in the infrastructure
rather than in the individual modules. This allows multiple
security modules to provide mount options.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h  |  5 +++++
 security/security.c        | 18 ++++++++++++++++++
 security/selinux/hooks.c   | 31 ++++++++++++++++++-------------
 security/smack/smack_lsm.c | 19 +++++++++++++------
 4 files changed, 54 insertions(+), 19 deletions(-)

Patch
diff mbox series

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index b0f788bf82b6..a54a2f4788af 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2060,6 +2060,7 @@  struct lsm_blob_sizes {
 	int	lbs_key;
 	int	lbs_msg_msg;
 	int	lbs_task;
+	int	lbs_mnt_opts;
 };
 
 /*
@@ -2148,4 +2149,8 @@  static inline int lsm_task_display(struct task_struct *task)
 	return LSMBLOB_INVALID;
 }
 
+#ifdef CONFIG_SECURITY
+void *lsm_mnt_opts_alloc(void);
+#endif
+
 #endif /* ! __LINUX_LSM_HOOKS_H */
diff --git a/security/security.c b/security/security.c
index e3ea48c87dba..6dbc7ed2a00d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -183,6 +183,7 @@  static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
 #ifdef CONFIG_KEYS
 	lsm_set_blob_size(&needed->lbs_key, &blob_sizes.lbs_key);
 #endif
+	lsm_set_blob_size(&needed->lbs_mnt_opts, &blob_sizes.lbs_mnt_opts);
 	lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
 	lsm_set_blob_size(&needed->lbs_sock, &blob_sizes.lbs_sock);
 	lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
@@ -321,6 +322,7 @@  static void __init ordered_lsm_init(void)
 #ifdef CONFIG_KEYS
 	init_debug("key blob size        = %d\n", blob_sizes.lbs_key);
 #endif /* CONFIG_KEYS */
+	init_debug("mnt_opts blob size   = %d\n", blob_sizes.lbs_mnt_opts);
 	init_debug("msg_msg blob size    = %d\n", blob_sizes.lbs_msg_msg);
 	init_debug("sock blob size       = %d\n", blob_sizes.lbs_sock);
 	init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
@@ -779,6 +781,21 @@  static int append_ctx(char **ctx, int *ctxlen, const char *lsm, char *new,
 	return 0;
 }
 
+/**
+ * lsm_mnt_opts_alloc - allocate a composite mnt_opts blob
+ *
+ * Allocate the mount options blob
+ *
+ * Returns the blob, or NULL if memory can't be allocated.
+ */
+void *lsm_mnt_opts_alloc(void)
+{
+	if (blob_sizes.lbs_mnt_opts == 0)
+		return NULL;
+
+	return kzalloc(blob_sizes.lbs_mnt_opts, GFP_KERNEL);
+}
+
 /*
  * Hook list operation macros.
  *
@@ -974,6 +991,7 @@  void security_free_mnt_opts(void **mnt_opts)
 	if (!*mnt_opts)
 		return;
 	call_void_hook(sb_free_mnt_opts, *mnt_opts);
+	kfree(*mnt_opts);
 	*mnt_opts = NULL;
 }
 EXPORT_SYMBOL(security_free_mnt_opts);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 021694b4aca7..65bd62dca9e9 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -383,14 +383,20 @@  struct selinux_mnt_opts {
 	const char *fscontext, *context, *rootcontext, *defcontext;
 };
 
+static void *selinux_mnt_opts(void *mnt_opts)
+{
+	if (mnt_opts)
+		return mnt_opts + selinux_blob_sizes.lbs_mnt_opts;
+	return NULL;
+}
+
 static void selinux_free_mnt_opts(void *mnt_opts)
 {
-	struct selinux_mnt_opts *opts = mnt_opts;
+	struct selinux_mnt_opts *opts = selinux_mnt_opts(mnt_opts);
 	kfree(opts->fscontext);
 	kfree(opts->context);
 	kfree(opts->rootcontext);
 	kfree(opts->defcontext);
-	kfree(opts);
 }
 
 static inline int inode_doinit(struct inode *inode)
@@ -638,7 +644,7 @@  static int selinux_set_mnt_opts(struct super_block *sb,
 	const struct cred *cred = current_cred();
 	struct superblock_security_struct *sbsec = selinux_superblock(sb);
 	struct dentry *root = sbsec->sb->s_root;
-	struct selinux_mnt_opts *opts = mnt_opts;
+	struct selinux_mnt_opts *opts = selinux_mnt_opts(mnt_opts);
 	struct inode_security_struct *root_isec;
 	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
 	u32 defcontext_sid = 0;
@@ -653,7 +659,8 @@  static int selinux_set_mnt_opts(struct super_block *sb,
 			   server is ready to handle calls. */
 			goto out;
 		}
-		rc = -EINVAL;
+		/* Don't set any SELinux options. Allow any other LSM
+		   that's on the stack to do so. */
 		pr_warn("SELinux: Unable to set superblock options "
 			"before the security server is initialized\n");
 		goto out;
@@ -980,16 +987,17 @@  static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
 
 static int selinux_add_opt(int token, const char *s, void **mnt_opts)
 {
-	struct selinux_mnt_opts *opts = *mnt_opts;
+	struct selinux_mnt_opts *opts = selinux_mnt_opts(*mnt_opts);
 
 	if (token == Opt_seclabel)	/* eaten and completely ignored */
 		return 0;
 
 	if (!opts) {
-		opts = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
+		opts = lsm_mnt_opts_alloc();
 		if (!opts)
 			return -ENOMEM;
 		*mnt_opts = opts;
+		opts = selinux_mnt_opts(opts);
 	}
 	if (!s)
 		return -ENOMEM;
@@ -1042,10 +1050,8 @@  static int selinux_add_mnt_opt(const char *option, const char *val, int len,
 	rc = selinux_add_opt(token, val, mnt_opts);
 	if (unlikely(rc)) {
 		kfree(val);
-		if (*mnt_opts) {
+		if (*mnt_opts)
 			selinux_free_mnt_opts(*mnt_opts);
-			*mnt_opts = NULL;
-		}
 	}
 	return rc;
 }
@@ -2645,10 +2651,8 @@  static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
 			rc = selinux_add_opt(token, arg, mnt_opts);
 			if (unlikely(rc)) {
 				kfree(arg);
-				if (*mnt_opts) {
+				if (*mnt_opts)
 					selinux_free_mnt_opts(*mnt_opts);
-					*mnt_opts = NULL;
-				}
 				return rc;
 			}
 		} else {
@@ -2671,7 +2675,7 @@  static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
 
 static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
 {
-	struct selinux_mnt_opts *opts = mnt_opts;
+	struct selinux_mnt_opts *opts = selinux_mnt_opts(mnt_opts);
 	struct superblock_security_struct *sbsec = selinux_superblock(sb);
 	u32 sid;
 	int rc;
@@ -6640,6 +6644,7 @@  struct lsm_blob_sizes selinux_blob_sizes __lsm_ro_after_init = {
 #ifdef CONFIG_KEYS
 	.lbs_key = sizeof(struct key_security_struct),
 #endif /* CONFIG_KEYS */
+	.lbs_mnt_opts = sizeof(struct selinux_mnt_opts),
 	.lbs_msg_msg = sizeof(struct msg_security_struct),
 	.lbs_sock = sizeof(struct sk_security_struct),
 	.lbs_superblock = sizeof(struct superblock_security_struct),
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index f253d569dee6..a9fb5f53a248 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -557,26 +557,33 @@  struct smack_mnt_opts {
 	const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute;
 };
 
+static void *smack_mnt_opts(void *opts)
+{
+	if (opts)
+		return opts + smack_blob_sizes.lbs_mnt_opts;
+	return NULL;
+}
+
 static void smack_free_mnt_opts(void *mnt_opts)
 {
-	struct smack_mnt_opts *opts = mnt_opts;
+	struct smack_mnt_opts *opts = smack_mnt_opts(mnt_opts);
 	kfree(opts->fsdefault);
 	kfree(opts->fsfloor);
 	kfree(opts->fshat);
 	kfree(opts->fsroot);
 	kfree(opts->fstransmute);
-	kfree(opts);
 }
 
 static int smack_add_opt(int token, const char *s, void **mnt_opts)
 {
-	struct smack_mnt_opts *opts = *mnt_opts;
+	struct smack_mnt_opts *opts = smack_mnt_opts(*mnt_opts);
 
 	if (!opts) {
-		opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
+		opts = lsm_mnt_opts_alloc();
 		if (!opts)
 			return -ENOMEM;
 		*mnt_opts = opts;
+		opts = smack_mnt_opts(opts);
 	}
 	if (!s)
 		return -ENOMEM;
@@ -724,7 +731,6 @@  static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
 				kfree(arg);
 				if (*mnt_opts)
 					smack_free_mnt_opts(*mnt_opts);
-				*mnt_opts = NULL;
 				return rc;
 			}
 		} else {
@@ -767,7 +773,7 @@  static int smack_set_mnt_opts(struct super_block *sb,
 	struct superblock_smack *sp = smack_superblock(sb);
 	struct inode_smack *isp;
 	struct smack_known *skp;
-	struct smack_mnt_opts *opts = mnt_opts;
+	struct smack_mnt_opts *opts = smack_mnt_opts(mnt_opts);
 	bool transmute = false;
 
 	if (sp->smk_flags & SMK_SB_INITIALIZED)
@@ -4561,6 +4567,7 @@  struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
 #ifdef CONFIG_KEYS
 	.lbs_key = sizeof(struct smack_known *),
 #endif /* CONFIG_KEYS */
+	.lbs_mnt_opts = sizeof(struct smack_mnt_opts),
 	.lbs_msg_msg = sizeof(struct smack_known *),
 	.lbs_sock = sizeof(struct socket_smack),
 	.lbs_superblock = sizeof(struct superblock_smack),