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From: Casey Schaufler <casey@schaufler-ca.com>
To: LSM <linux-security-module@vger.kernel.org>,
	LKLM <linux-kernel@vger.kernel.org>,
	Paul Moore <paul@paul-moore.com>,
	Stephen Smalley <sds@tycho.nsa.gov>,
	SE Linux <selinux@tycho.nsa.gov>,
	"SMACK-discuss@lists.01.org" <SMACK-discuss@lists.01.org>,
	John Johansen <john.johansen@canonical.com>,
	Kees Cook <keescook@chromium.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	James Morris <jmorris@namei.org>
Subject: [PATCH 05/23] SELinux: Abstract use of file security blob
Date: Thu, 10 May 2018 17:52:57 -0700	[thread overview]
Message-ID: <552c12d4-8254-5805-4586-34aaa5c1f389@schaufler-ca.com> (raw)
In-Reply-To: <7e8702ce-2598-e0a3-31a2-bc29157fb73d@schaufler-ca.com>

From: Casey Schaufler <casey@schaufler-ca.com>
Date: Thu, 10 May 2018 14:01:52 -0700
Subject: [PATCH 05/23] SELinux: Abstract use of file security blob

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

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/selinux/hooks.c          | 18 +++++++++---------
 security/selinux/include/objsec.h |  5 +++++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f4179eb572e8..1d0a4a9fa08b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -398,7 +398,7 @@ static int file_alloc_security(struct file *file)
 
 static void file_free_security(struct file *file)
 {
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	file->f_security = NULL;
 	kmem_cache_free(file_security_cache, fsec);
 }
@@ -1869,7 +1869,7 @@ static int file_has_perm(const struct cred *cred,
 			 struct file *file,
 			 u32 av)
 {
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode *inode = file_inode(file);
 	struct common_audit_data ad;
 	u32 sid = cred_sid(cred);
@@ -2213,7 +2213,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
 					struct file *file)
 {
 	u32 sid = task_sid(to);
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode_security_struct *isec;
 	struct common_audit_data ad;
@@ -3524,7 +3524,7 @@ static int selinux_revalidate_file_permission(struct file *file, int mask)
 static int selinux_file_permission(struct file *file, int mask)
 {
 	struct inode *inode = file_inode(file);
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode_security_struct *isec;
 	u32 sid = current_sid();
 
@@ -3559,7 +3559,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
 		u32 requested, u16 cmd)
 {
 	struct common_audit_data ad;
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode *inode = file_inode(file);
 	struct inode_security_struct *isec;
 	struct lsm_ioctlop_audit ioctl;
@@ -3811,7 +3811,7 @@ static void selinux_file_set_fowner(struct file *file)
 {
 	struct file_security_struct *fsec;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	fsec->fown_sid = current_sid();
 }
 
@@ -3826,7 +3826,7 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk,
 	/* struct fown_struct is never outside the context of a struct file */
 	file = container_of(fown, struct file, f_owner);
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 
 	if (!signum)
 		perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
@@ -3850,7 +3850,7 @@ static int selinux_file_open(struct file *file, const struct cred *cred)
 	struct file_security_struct *fsec;
 	struct inode_security_struct *isec;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	isec = inode_security(file_inode(file));
 	/*
 	 * Save inode label and policy sequence number
@@ -3990,7 +3990,7 @@ static int selinux_kernel_module_from_file(struct file *file)
 	ad.type = LSM_AUDIT_DATA_FILE;
 	ad.u.file = file;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	if (sid != fsec->sid) {
 		rc = avc_has_perm(&selinux_state,
 				  sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index db1c7000ada3..2586fbc7e38c 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -167,4 +167,9 @@ static inline struct task_security_struct *selinux_cred(const struct cred *cred)
 	return cred->security;
 }
 
+static inline struct file_security_struct *selinux_file(const struct file *file)
+{
+	return file->f_security;
+}
+
 #endif /* _SELINUX_OBJSEC_H_ */
-- 
2.14.3

  parent reply	other threads:[~2018-05-11  0:53 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11  0:30 [PATCH 00/23] LSM: Full security module stacking Casey Schaufler
2018-05-11  0:52 ` [PATCH 01/23] procfs: add smack subdir to attrs Casey Schaufler
2018-05-11  0:52 ` [PATCH 02/23] Smack: Abstract use of cred security blob Casey Schaufler
2018-05-11  0:52 ` [PATCH 03/23] SELinux: " Casey Schaufler
2018-05-11  0:52 ` [PATCH 04/23] LSM: Infrastructure management of the cred security Casey Schaufler
2018-05-11  0:52 ` Casey Schaufler [this message]
2018-05-11  0:53 ` [PATCH 06/23] LSM: Infrastructure management of the file security Casey Schaufler
2018-05-11  0:53 ` [PATCH 07/23] LSM: Infrastructure management of the task security Casey Schaufler
2018-05-11  0:53 ` [PATCH 08/23] SELinux: Abstract use of inode security blob Casey Schaufler
2018-05-11  0:53 ` [PATCH 09/23] Smack: " Casey Schaufler
2018-05-11  0:53 ` [PATCH 10/23] LSM: Infrastructure management of the inode security Casey Schaufler
2018-05-14 15:04   ` Stephen Smalley
2018-05-14 16:32     ` Casey Schaufler
2018-05-11  0:54 ` [PATCH 11/23] LSM: Infrastructure management of the superblock Casey Schaufler
2018-05-11  0:54 ` [PATCH 12/23] LSM: Infrastructure management of the sock security Casey Schaufler
2018-05-11  0:54 ` [PATCH 13/23] LSM: Infrastructure management of the ipc security blob Casey Schaufler
2018-05-11  0:54 ` [PATCH 14/23] LSM: Infrastructure management of the key " Casey Schaufler
2018-05-11  0:55 ` [PATCH 15/23] LSM: Mark security blob allocation failures as unlikely Casey Schaufler
2018-05-11  0:55 ` [PATCH 16/23] LSM: Sharing of security blobs Casey Schaufler
2018-05-11  0:55 ` [PATCH 17/23] LSM: Allow mount options from multiple security modules Casey Schaufler
2018-05-11  0:55 ` [PATCH 18/23] LSM: Use multiple secids in security module interfaces Casey Schaufler
2018-05-11  0:55 ` [PATCH 19/23] LSM: Use multiple secids in LSM interfaces Casey Schaufler
2018-05-11  0:55 ` [PATCH 20/23] LSM: Move common usercopy into Casey Schaufler
2018-05-14 15:12   ` Stephen Smalley
2018-05-14 16:53     ` Stephen Smalley
2018-05-14 18:55       ` Casey Schaufler
2018-05-11  0:56 ` [PATCH 21/23] LSM: Multiple concurrent major security modules Casey Schaufler
2018-05-11  0:56 ` [PATCH 22/23] LSM: Fix setting of the IMA data in inode init Casey Schaufler
2018-05-11  0:56 ` [PATCH 23/23] Netfilter: Add a selection for Smack Casey Schaufler
2018-05-11  0:58 ` [PATCH 00/23] LSM: Full security module stacking Casey Schaufler
2018-05-11 20:25 ` [PATCH 24/23] LSM: Functions for dealing with struct secids Casey Schaufler

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