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From: Casey Schaufler <casey@schaufler-ca.com>
To: jmorris@namei.org, linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, selinux@vger.kernel.org
Cc: john.johansen@canonical.com, keescook@chromium.org,
	penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
	linux-fsdevel@vger.kernel.org, sds@tycho.nsa.gov,
	adobriyan@gmail.com, mic@digikod.net, s.mesoraca16@gmail.com,
	casey@schaufler-ca.com
Subject: [PATCH v5 31/38] SELinux: Abstract use of inode security blob
Date: Tue, 11 Dec 2018 14:43:07 -0800
Message-ID: <20181211224314.22412-32-casey@schaufler-ca.com> (raw)
In-Reply-To: <20181211224314.22412-1-casey@schaufler-ca.com>

Don't use the inode->i_security pointer directly.
Provide a helper function that provides the security blob pointer.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 security/selinux/hooks.c          | 26 +++++++++++++-------------
 security/selinux/include/objsec.h |  6 ++++++
 security/selinux/selinuxfs.c      |  4 ++--
 3 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 9669a059ce0f..3069e95d86e6 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -272,7 +272,7 @@ static int __inode_security_revalidate(struct inode *inode,
 				       struct dentry *dentry,
 				       bool may_sleep)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 
 	might_sleep_if(may_sleep);
 
@@ -293,7 +293,7 @@ static int __inode_security_revalidate(struct inode *inode,
 
 static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
 {
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
@@ -303,7 +303,7 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo
 	error = __inode_security_revalidate(inode, NULL, !rcu);
 	if (error)
 		return ERR_PTR(error);
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 /*
@@ -312,14 +312,14 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo
 static struct inode_security_struct *inode_security(struct inode *inode)
 {
 	__inode_security_revalidate(inode, NULL, true);
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
 {
 	struct inode *inode = d_backing_inode(dentry);
 
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 /*
@@ -330,7 +330,7 @@ static struct inode_security_struct *backing_inode_security(struct dentry *dentr
 	struct inode *inode = d_backing_inode(dentry);
 
 	__inode_security_revalidate(inode, dentry, true);
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 static void inode_free_rcu(struct rcu_head *head)
@@ -343,7 +343,7 @@ static void inode_free_rcu(struct rcu_head *head)
 
 static void inode_free_security(struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	struct superblock_security_struct *sbsec = inode->i_sb->s_security;
 
 	/*
@@ -1502,7 +1502,7 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
 {
 	struct superblock_security_struct *sbsec = NULL;
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	u32 task_sid, sid = 0;
 	u16 sclass;
 	struct dentry *dentry;
@@ -1802,7 +1802,7 @@ static int inode_has_perm(const struct cred *cred,
 		return 0;
 
 	sid = cred_sid(cred);
-	isec = inode->i_security;
+	isec = selinux_inode(inode);
 
 	return avc_has_perm(&selinux_state,
 			    sid, isec->sid, isec->sclass, perms, adp);
@@ -3030,7 +3030,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 
 	/* Possibly defer initialization to selinux_complete_init. */
 	if (sbsec->flags & SE_SBINITIALIZED) {
-		struct inode_security_struct *isec = inode->i_security;
+		struct inode_security_struct *isec = selinux_inode(inode);
 		isec->sclass = inode_mode_to_security_class(inode->i_mode);
 		isec->sid = newsid;
 		isec->initialized = LABEL_INITIALIZED;
@@ -3130,7 +3130,7 @@ static noinline int audit_inode_permission(struct inode *inode,
 					   unsigned flags)
 {
 	struct common_audit_data ad;
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	int rc;
 
 	ad.type = LSM_AUDIT_DATA_INODE;
@@ -4150,7 +4150,7 @@ static int selinux_task_kill(struct task_struct *p, struct kernel_siginfo *info,
 static void selinux_task_to_inode(struct task_struct *p,
 				  struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	u32 sid = task_sid(p);
 
 	spin_lock(&isec->lock);
@@ -6529,7 +6529,7 @@ static void selinux_release_secctx(char *secdata, u32 seclen)
 
 static void selinux_inode_invalidate_secctx(struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 
 	spin_lock(&isec->lock);
 	isec->initialized = LABEL_INVALID;
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 96374dbf4ace..26b4ff6b4d81 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -170,4 +170,10 @@ static inline struct file_security_struct *selinux_file(const struct file *file)
 	return file->f_security + selinux_blob_sizes.lbs_file;
 }
 
+static inline struct inode_security_struct *selinux_inode(
+						const struct inode *inode)
+{
+	return inode->i_security;
+}
+
 #endif /* _SELINUX_OBJSEC_H_ */
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index f3a5a138a096..145ee62f205a 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1378,7 +1378,7 @@ static int sel_make_bools(struct selinux_fs_info *fsi)
 			goto out;
 		}
 
-		isec = (struct inode_security_struct *)inode->i_security;
+		isec = selinux_inode(inode);
 		ret = security_genfs_sid(fsi->state, "selinuxfs", page,
 					 SECCLASS_FILE, &sid);
 		if (ret) {
@@ -1953,7 +1953,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 	}
 
 	inode->i_ino = ++fsi->last_ino;
-	isec = (struct inode_security_struct *)inode->i_security;
+	isec = selinux_inode(inode);
 	isec->sid = SECINITSID_DEVNULL;
 	isec->sclass = SECCLASS_CHR_FILE;
 	isec->initialized = LABEL_INITIALIZED;
-- 
2.14.5


  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-11 22:42 [PATCH v5 00/38] LSM: Module stacking for SARA and Landlock Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 01/38] LSM: Introduce LSM_FLAG_LEGACY_MAJOR Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 02/38] LSM: Provide separate ordered initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 03/38] LSM: Plumb visibility into optional "enabled" state Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 04/38] LSM: Lift LSM selection out of individual LSMs Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 05/38] LSM: Build ordered list of LSMs to initialize Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 06/38] LSM: Introduce CONFIG_LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 07/38] LSM: Introduce "lsm=" for boottime LSM selection Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 08/38] LSM: Tie enabling logic to presence in ordered list Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 09/38] LSM: Prepare for reorganizing "security=" logic Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 10/38] LSM: Refactor "security=" in terms of enable/disable Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 11/38] LSM: Separate idea of "major" LSM from "exclusive" LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 12/38] apparmor: Remove SECURITY_APPARMOR_BOOTPARAM_VALUE Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 13/38] selinux: Remove SECURITY_SELINUX_BOOTPARAM_VALUE Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 14/38] LSM: Add all exclusive LSMs to ordered initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 15/38] LSM: Split LSM preparation from initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 16/38] LoadPin: Initialize as ordered LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 17/38] Yama: " Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 18/38] LSM: Introduce enum lsm_order Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 19/38] capability: Initialize as LSM_ORDER_FIRST Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 20/38] procfs: add smack subdir to attrs Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 21/38] Smack: Abstract use of cred security blob Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 22/38] SELinux: " Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 23/38] SELinux: Remove cred security blob poisoning Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 24/38] SELinux: Remove unused selinux_is_enabled Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 25/38] AppArmor: Abstract use of cred security blob Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 26/38] TOMOYO: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 27/38] Infrastructure management of the " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 28/38] SELinux: Abstract use of file " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 29/38] Smack: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 30/38] LSM: Infrastructure management of the file security Casey Schaufler
2018-12-11 22:43 ` Casey Schaufler [this message]
2018-12-11 22:43 ` [PATCH v5 32/38] Smack: Abstract use of inode security blob Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 33/38] LSM: Infrastructure management of the inode security Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 34/38] LSM: Infrastructure management of the task security Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 35/38] SELinux: Abstract use of ipc security blobs Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 36/38] Smack: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 37/38] LSM: Infrastructure management of the ipc security blob Casey Schaufler
2018-12-12 16:05 ` [PATCH v5 38/38] TOMOYO: Update LSM flags to no longer be exclusive Casey Schaufler
  -- strict thread matches above, loose matches on Subject: below --
2018-11-26 23:22 [PATCH v5 00/38] LSM: Module stacking for SARA and Landlock Casey Schaufler
2018-11-26 23:51 ` [PATCH v5 31/38] SELinux: Abstract use of inode security blob Casey Schaufler

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