1 files changed, 382 insertions, 114 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f7e2cd8c3e53..3bac79428c9b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -83,6 +83,7 @@
 #include <linux/export.h>
 #include <linux/msg.h>
 #include <linux/shm.h>
+#include <linux/bpf.h>
 
 #include "avc.h"
 #include "objsec.h"
@@ -242,6 +243,79 @@ static int inode_alloc_security(struct inode *inode)
 	return 0;
 }
 
+static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
+
+/*
+ * Try reloading inode security labels that have been marked as invalid.  The
+ * @may_sleep parameter indicates when sleeping and thus reloading labels is
+ * allowed; when set to false, returns ERR_PTR(-ECHILD) when the label is
+ * invalid.  The @opt_dentry parameter should be set to a dentry of the inode;
+ * when no dentry is available, set it to NULL instead.
+ */
+static int __inode_security_revalidate(struct inode *inode,
+				       struct dentry *opt_dentry,
+				       bool may_sleep)
+{
+	struct inode_security_struct *isec = inode->i_security;
+
+	might_sleep_if(may_sleep);
+
+	if (ss_initialized && isec->initialized != LABEL_INITIALIZED) {
+		if (!may_sleep)
+			return -ECHILD;
+
+		/*
+		 * Try reloading the inode security label.  This will fail if
+		 * @opt_dentry is NULL and no dentry for this inode can be
+		 * found; in that case, continue using the old label.
+		 */
+		inode_doinit_with_dentry(inode, opt_dentry);
+	}
+	return 0;
+}
+
+static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
+{
+	return inode->i_security;
+}
+
+static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
+{
+	int error;
+
+	error = __inode_security_revalidate(inode, NULL, !rcu);
+	if (error)
+		return ERR_PTR(error);
+	return inode->i_security;
+}
+
+/*
+ * Get the security label of an inode.
+ */
+static struct inode_security_struct *inode_security(struct inode *inode)
+{
+	__inode_security_revalidate(inode, NULL, true);
+	return inode->i_security;
+}
+
+static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
+{
+	struct inode *inode = d_backing_inode(dentry);
+
+	return inode->i_security;
+}
+
+/*
+ * Get the security label of a dentry's backing inode.
+ */
+static struct inode_security_struct *backing_inode_security(struct dentry *dentry)
+{
+	struct inode *inode = d_backing_inode(dentry);
+
+	__inode_security_revalidate(inode, dentry, true);
+	return inode->i_security;
+}
+
 static void inode_free_rcu(struct rcu_head *head)
 {
 	struct inode_security_struct *isec;
@@ -333,8 +407,6 @@ static void superblock_free_security(struct super_block *sb)
 	kfree(sbsec);
 }
 
-static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
-
 static inline int inode_doinit(struct inode *inode)
 {
 	return inode_doinit_with_dentry(inode, NULL);
@@ -572,8 +644,8 @@ static int selinux_get_mnt_opts(const struct super_block *sb,
 		opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
 	}
 	if (sbsec->flags & ROOTCONTEXT_MNT) {
-		struct inode *root = d_backing_inode(sbsec->sb->s_root);
-		struct inode_security_struct *isec = root->i_security;
+		struct dentry *root = sbsec->sb->s_root;
+		struct inode_security_struct *isec = backing_inode_security(root);
 
 		rc = security_sid_to_context(isec->sid, &context, &len);
 		if (rc)
@@ -628,8 +700,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	int rc = 0, i;
 	struct superblock_security_struct *sbsec = sb->s_security;
 	const char *name = sb->s_type->name;
-	struct inode *inode = d_backing_inode(sbsec->sb->s_root);
-	struct inode_security_struct *root_isec = inode->i_security;
+	struct dentry *root = sbsec->sb->s_root;
+	struct inode_security_struct *root_isec;
 	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
 	u32 defcontext_sid = 0;
 	char **mount_options = opts->mnt_opts;
@@ -672,6 +744,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	    && (num_opts == 0))
 		goto out;
 
+	root_isec = backing_inode_security_novalidate(root);
+
 	/*
 	 * parse the mount options, check if they are valid sids.
 	 * also check if someone is trying to mount the same sb more
@@ -748,7 +822,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	if (!strcmp(sb->s_type->name, "debugfs") ||
 	    !strcmp(sb->s_type->name, "tracefs") ||
 	    !strcmp(sb->s_type->name, "sysfs") ||
-	    !strcmp(sb->s_type->name, "pstore"))
+	    !strcmp(sb->s_type->name, "pstore") ||
+	    !strcmp(sb->s_type->name, "bpf"))
 		sbsec->flags |= SE_SBGENFS;
 
 	if (!sbsec->behavior) {
@@ -810,7 +885,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 			goto out;
 
 		root_isec->sid = rootcontext_sid;
-		root_isec->initialized = 1;
+		root_isec->initialized = LABEL_INITIALIZED;
 	}
 
 	if (defcontext_sid) {
@@ -860,8 +935,8 @@ static int selinux_cmp_sb_context(const struct super_block *oldsb,
 	if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid)
 		goto mismatch;
 	if (oldflags & ROOTCONTEXT_MNT) {
-		struct inode_security_struct *oldroot = d_backing_inode(oldsb->s_root)->i_security;
-		struct inode_security_struct *newroot = d_backing_inode(newsb->s_root)->i_security;
+		struct inode_security_struct *oldroot = backing_inode_security(oldsb->s_root);
+		struct inode_security_struct *newroot = backing_inode_security(newsb->s_root);
 		if (oldroot->sid != newroot->sid)
 			goto mismatch;
 	}
@@ -911,17 +986,14 @@ static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
 		if (!set_fscontext)
 			newsbsec->sid = sid;
 		if (!set_rootcontext) {
-			struct inode *newinode = d_backing_inode(newsb->s_root);
-			struct inode_security_struct *newisec = newinode->i_security;
+			struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
 			newisec->sid = sid;
 		}
 		newsbsec->mntpoint_sid = sid;
 	}
 	if (set_rootcontext) {
-		const struct inode *oldinode = d_backing_inode(oldsb->s_root);
-		const struct inode_security_struct *oldisec = oldinode->i_security;
-		struct inode *newinode = d_backing_inode(newsb->s_root);
-		struct inode_security_struct *newisec = newinode->i_security;
+		const struct inode_security_struct *oldisec = backing_inode_security(oldsb->s_root);
+		struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
 
 		newisec->sid = oldisec->sid;
 	}
@@ -1303,11 +1375,11 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 	unsigned len = 0;
 	int rc = 0;
 
-	if (isec->initialized)
+	if (isec->initialized == LABEL_INITIALIZED)
 		goto out;
 
 	mutex_lock(&isec->lock);
-	if (isec->initialized)
+	if (isec->initialized == LABEL_INITIALIZED)
 		goto out_unlock;
 
 	sbsec = inode->i_sb->s_security;
@@ -1479,7 +1551,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 		break;
 	}
 
-	isec->initialized = 1;
+	isec->initialized = LABEL_INITIALIZED;
 
 out_unlock:
 	mutex_unlock(&isec->lock);
@@ -1571,7 +1643,7 @@ static int current_has_perm(const struct task_struct *tsk,
 
 /* Check whether a task is allowed to use a capability. */
 static int cred_has_capability(const struct cred *cred,
-			       int cap, int audit)
+			       int cap, int audit, bool initns)
 {
 	struct common_audit_data ad;
 	struct av_decision avd;
@@ -1585,10 +1657,10 @@ static int cred_has_capability(const struct cred *cred,
 
 	switch (CAP_TO_INDEX(cap)) {
 	case 0:
-		sclass = SECCLASS_CAPABILITY;
+		sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
 		break;
 	case 1:
-		sclass = SECCLASS_CAPABILITY2;
+		sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
 		break;
 	default:
 		printk(KERN_ERR
@@ -1650,6 +1722,7 @@ static inline int dentry_has_perm(const struct cred *cred,
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
+	__inode_security_revalidate(inode, dentry, true);
 	return inode_has_perm(cred, inode, av, &ad);
 }
 
@@ -1665,6 +1738,7 @@ static inline int path_has_perm(const struct cred *cred,
 
 	ad.type = LSM_AUDIT_DATA_PATH;
 	ad.u.path = *path;
+	__inode_security_revalidate(inode, path->dentry, true);
 	return inode_has_perm(cred, inode, av, &ad);
 }
 
@@ -1680,6 +1754,10 @@ static inline int file_path_has_perm(const struct cred *cred,
 	return inode_has_perm(cred, file_inode(file), av, &ad);
 }
 
+#ifdef CONFIG_BPF_SYSCALL
+static int bpf_fd_pass(struct file *file, u32 sid);
+#endif
+
 /* Check whether a task can use an open file descriptor to
    access an inode in a given way.  Check access to the
    descriptor itself, and then use dentry_has_perm to
@@ -1710,6 +1788,12 @@ static int file_has_perm(const struct cred *cred,
 			goto out;
 	}
 
+#ifdef CONFIG_BPF_SYSCALL
+	rc = bpf_fd_pass(file, cred_sid(cred));
+	if (rc)
+		return rc;
+#endif
+
 	/* av is zero if only checking access to the descriptor. */
 	rc = 0;
 	if (av)
@@ -1722,13 +1806,12 @@ out:
 /*
  * Determine the label for an inode that might be unioned.
  */
-static int selinux_determine_inode_label(const struct inode *dir,
+static int selinux_determine_inode_label(struct inode *dir,
 					 const struct qstr *name,
 					 u16 tclass,
 					 u32 *_new_isid)
 {
 	const struct superblock_security_struct *sbsec = dir->i_sb->s_security;
-	const struct inode_security_struct *dsec = dir->i_security;
 	const struct task_security_struct *tsec = current_security();
 
 	if ((sbsec->flags & SE_SBINITIALIZED) &&
@@ -1738,6 +1821,7 @@ static int selinux_determine_inode_label(const struct inode *dir,
 		   tsec->create_sid) {
 		*_new_isid = tsec->create_sid;
 	} else {
+		const struct inode_security_struct *dsec = inode_security(dir);
 		return security_transition_sid(tsec->sid, dsec->sid, tclass,
 					       name, _new_isid);
 	}
@@ -1757,7 +1841,7 @@ static int may_create(struct inode *dir,
 	struct common_audit_data ad;
 	int rc;
 
-	dsec = dir->i_security;
+	dsec = inode_security(dir);
 	sbsec = dir->i_sb->s_security;
 
 	sid = tsec->sid;
@@ -1810,8 +1894,8 @@ static int may_link(struct inode *dir,
 	u32 av;
 	int rc;
 
-	dsec = dir->i_security;
-	isec = d_backing_inode(dentry)->i_security;
+	dsec = inode_security(dir);
+	isec = backing_inode_security(dentry);
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
@@ -1853,10 +1937,10 @@ static inline int may_rename(struct inode *old_dir,
 	int old_is_dir, new_is_dir;
 	int rc;
 
-	old_dsec = old_dir->i_security;
-	old_isec = d_backing_inode(old_dentry)->i_security;
+	old_dsec = inode_security(old_dir);
+	old_isec = backing_inode_security(old_dentry);
 	old_is_dir = d_is_dir(old_dentry);
-	new_dsec = new_dir->i_security;
+	new_dsec = inode_security(new_dir);
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 
@@ -1884,7 +1968,7 @@ static inline int may_rename(struct inode *old_dir,
 	if (rc)
 		return rc;
 	if (d_is_positive(new_dentry)) {
-		new_isec = d_backing_inode(new_dentry)->i_security;
+		new_isec = backing_inode_security(new_dentry);
 		new_is_dir = d_is_dir(new_dentry);
 		rc = avc_has_perm(sid, new_isec->sid,
 				  new_isec->sclass,
@@ -1977,21 +2061,18 @@ static inline u32 open_file_to_av(struct file *file)
 
 /* Hook functions begin here. */
 
-static int selinux_binder_set_context_mgr(struct task_struct *mgr)
+static int selinux_binder_set_context_mgr(const struct cred *mgr)
 {
-	u32 mysid = current_sid();
-	u32 mgrsid = task_sid(mgr);
-
-	return avc_has_perm(mysid, mgrsid, SECCLASS_BINDER,
+	return avc_has_perm(current_sid(), cred_sid(mgr), SECCLASS_BINDER,
 			    BINDER__SET_CONTEXT_MGR, NULL);
 }
 
-static int selinux_binder_transaction(struct task_struct *from,
-				      struct task_struct *to)
+static int selinux_binder_transaction(const struct cred *from,
+				      const struct cred *to)
 {
 	u32 mysid = current_sid();
-	u32 fromsid = task_sid(from);
-	u32 tosid = task_sid(to);
+	u32 fromsid = cred_sid(from);
+	u32 tosid = cred_sid(to);
 	int rc;
 
 	if (mysid != fromsid) {
@@ -2005,24 +2086,22 @@ static int selinux_binder_transaction(struct task_struct *from,
 			    NULL);
 }
 
-static int selinux_binder_transfer_binder(struct task_struct *from,
-					  struct task_struct *to)
+static int selinux_binder_transfer_binder(const struct cred *from,
+					  const struct cred *to)
 {
-	u32 fromsid = task_sid(from);
-	u32 tosid = task_sid(to);
-
-	return avc_has_perm(fromsid, tosid, SECCLASS_BINDER, BINDER__TRANSFER,
+	return avc_has_perm(cred_sid(from), cred_sid(to),
+			    SECCLASS_BINDER, BINDER__TRANSFER,
 			    NULL);
 }
 
-static int selinux_binder_transfer_file(struct task_struct *from,
-					struct task_struct *to,
+static int selinux_binder_transfer_file(const struct cred *from,
+					const struct cred *to,
 					struct file *file)
 {
-	u32 sid = task_sid(to);
+	u32 sid = cred_sid(to);
 	struct file_security_struct *fsec = file->f_security;
-	struct inode *inode = d_backing_inode(file->f_path.dentry);
-	struct inode_security_struct *isec = inode->i_security;
+	struct dentry *dentry = file->f_path.dentry;
+	struct inode_security_struct *isec;
 	struct common_audit_data ad;
 	int rc;
 
@@ -2038,9 +2117,16 @@ static int selinux_binder_transfer_file(struct task_struct *from,
 			return rc;
 	}
 
-	if (unlikely(IS_PRIVATE(inode)))
+#ifdef CONFIG_BPF_SYSCALL
+	rc = bpf_fd_pass(file, sid);
+	if (rc)
+		return rc;
+#endif
+
+	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
 		return 0;
 
+	isec = backing_inode_security(dentry);
 	return avc_has_perm(sid, isec->sid, isec->sclass, file_to_av(file),
 			    &ad);
 }
@@ -2089,7 +2175,7 @@ static int selinux_capset(struct cred *new, const struct cred *old,
 static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
 			   int cap, int audit)
 {
-	return cred_has_capability(cred, cap, audit);
+	return cred_has_capability(cred, cap, audit, ns == &init_user_ns);
 }
 
 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
@@ -2167,7 +2253,7 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
 	int rc, cap_sys_admin = 0;
 
 	rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
-					SECURITY_CAP_NOAUDIT);
+				 SECURITY_CAP_NOAUDIT, true);
 	if (rc == 0)
 		cap_sys_admin = 1;
 
@@ -2227,7 +2313,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
 
 	old_tsec = current_security();
 	new_tsec = bprm->cred->security;
-	isec = inode->i_security;
+	isec = inode_security(inode);
 
 	/* Default to the current task SID. */
 	new_tsec->sid = old_tsec->sid;
@@ -2649,7 +2735,7 @@ static int selinux_sb_remount(struct super_block *sb, void *data)
 			break;
 		case ROOTCONTEXT_MNT: {
 			struct inode_security_struct *root_isec;
-			root_isec = d_backing_inode(sb->s_root)->i_security;
+			root_isec = backing_inode_security(sb->s_root);
 
 			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
 				goto out_bad_option;
@@ -2688,7 +2774,7 @@ static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
 		return rc;
 
 	/* Allow all mounts performed by the kernel */
-	if (flags & MS_KERNMOUNT)
+	if (flags & (MS_KERNMOUNT | MS_SUBMOUNT))
 		return 0;
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
@@ -2763,13 +2849,11 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 				       void **value, size_t *len)
 {
 	const struct task_security_struct *tsec = current_security();
-	struct inode_security_struct *dsec;
 	struct superblock_security_struct *sbsec;
 	u32 sid, newsid, clen;
 	int rc;
 	char *context;
 
-	dsec = dir->i_security;
 	sbsec = dir->i_sb->s_security;
 
 	sid = tsec->sid;
@@ -2787,7 +2871,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 		struct inode_security_struct *isec = inode->i_security;
 		isec->sclass = inode_mode_to_security_class(inode->i_mode);
 		isec->sid = newsid;
-		isec->initialized = 1;
+		isec->initialized = LABEL_INITIALIZED;
 	}
 
 	if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT))
@@ -2868,7 +2952,9 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
 	sid = cred_sid(cred);
-	isec = inode->i_security;
+	isec = inode_security_rcu(inode, rcu);
+	if (IS_ERR(isec))
+		return PTR_ERR(isec);
 
 	return avc_has_perm_flags(sid, isec->sid, isec->sclass, FILE__READ, &ad,
 				  rcu ? MAY_NOT_BLOCK : 0);
@@ -2920,7 +3006,9 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 	perms = file_mask_to_av(inode->i_mode, mask);
 
 	sid = cred_sid(cred);
-	isec = inode->i_security;
+	isec = inode_security_rcu(inode, flags & MAY_NOT_BLOCK);
+	if (IS_ERR(isec))
+		return PTR_ERR(isec);
 
 	rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd);
 	audited = avc_audit_required(perms, &avd, rc,
@@ -2993,7 +3081,7 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
 				  const void *value, size_t size, int flags)
 {
 	struct inode *inode = d_backing_inode(dentry);
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec;
 	struct superblock_security_struct *sbsec;
 	struct common_audit_data ad;
 	u32 newsid, sid = current_sid();
@@ -3012,6 +3100,7 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
 
+	isec = backing_inode_security(dentry);
 	rc = avc_has_perm(sid, isec->sid, isec->sclass,
 			  FILE__RELABELFROM, &ad);
 	if (rc)
@@ -3070,7 +3159,7 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
 					int flags)
 {
 	struct inode *inode = d_backing_inode(dentry);
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec;
 	u32 newsid;
 	int rc;
 
@@ -3087,9 +3176,10 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
 		return;
 	}
 
+	isec = backing_inode_security(dentry);
 	isec->sclass = inode_mode_to_security_class(inode->i_mode);
 	isec->sid = newsid;
-	isec->initialized = 1;
+	isec->initialized = LABEL_INITIALIZED;
 
 	return;
 }
@@ -3123,12 +3213,12 @@ static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
  *
  * Permission check is handled by selinux_inode_getxattr hook.
  */
-static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
+static int selinux_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc)
 {
 	u32 size;
 	int error;
 	char *context = NULL;
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec;
 
 	if (strcmp(name, XATTR_SELINUX_SUFFIX))
 		return -EOPNOTSUPP;
@@ -3146,7 +3236,8 @@ static int selinux_inode_getsecurity(const struct inode *inode, const char *name
 			    SECURITY_CAP_NOAUDIT);
 	if (!error)
 		error = cred_has_capability(current_cred(), CAP_MAC_ADMIN,
-					    SECURITY_CAP_NOAUDIT);
+					    SECURITY_CAP_NOAUDIT, true);
+	isec = inode_security(inode);
 	if (!error)
 		error = security_sid_to_context_force(isec->sid, &context,
 						      &size);
@@ -3167,7 +3258,7 @@ out_nofree:
 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
 				     const void *value, size_t size, int flags)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = inode_security_novalidate(inode);
 	u32 newsid;
 	int rc;
 
@@ -3183,7 +3274,7 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name,
 
 	isec->sclass = inode_mode_to_security_class(inode->i_mode);
 	isec->sid = newsid;
-	isec->initialized = 1;
+	isec->initialized = LABEL_INITIALIZED;
 	return 0;
 }
 
@@ -3195,9 +3286,9 @@ static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t
 	return len;
 }
 
-static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
+static void selinux_inode_getsecid(struct inode *inode, u32 *secid)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = inode_security(inode);
 	*secid = isec->sid;
 }
 
@@ -3220,13 +3311,14 @@ 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 inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec;
 	u32 sid = current_sid();
 
 	if (!mask)
 		/* No permission to check.  Existence test. */
 		return 0;
 
+	isec = inode_security(inode);
 	if (sid == fsec->sid && fsec->isid == isec->sid &&
 	    fsec->pseqno == avc_policy_seqno())
 		/* No change since file_open check. */
@@ -3255,7 +3347,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
 	struct common_audit_data ad;
 	struct file_security_struct *fsec = file->f_security;
 	struct inode *inode = file_inode(file);
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec;
 	struct lsm_ioctlop_audit ioctl;
 	u32 ssid = cred_sid(cred);
 	int rc;
@@ -3279,6 +3371,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
 	if (unlikely(IS_PRIVATE(inode)))
 		return 0;
 
+	isec = inode_security(inode);
 	rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass,
 			requested, driver, xperm, &ad);
 out:
@@ -3320,7 +3413,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
 	case KDSKBENT:
 	case KDSKBSENT:
 		error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
-					    SECURITY_CAP_AUDIT);
+					    SECURITY_CAP_AUDIT, true);
 		break;
 
 	/* default case assumes that the command will go
@@ -3519,7 +3612,7 @@ static int selinux_file_open(struct file *file, const struct cred *cred)
 	struct inode_security_struct *isec;
 
 	fsec = file->f_security;
-	isec = file_inode(file)->i_security;
+	isec = inode_security(file_inode(file));
 	/*
 	 * Save inode label and policy sequence number
 	 * at open-time so that selinux_file_permission
@@ -3637,7 +3730,7 @@ static int selinux_kernel_act_as(struct cred *new, u32 secid)
  */
 static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = inode_security(inode);
 	struct task_security_struct *tsec = new->security;
 	u32 sid = current_sid();
 	int ret;
@@ -3681,19 +3774,19 @@ static int selinux_kernel_module_from_file(struct file *file)
 					SYSTEM__MODULE_LOAD, NULL);
 
 	/* finit_module */
+
 	ad.type = LSM_AUDIT_DATA_PATH;
 	ad.u.path = file->f_path;
 
-	inode = file_inode(file);
-	isec = inode->i_security;
 	fsec = file->f_security;
-
 	if (sid != fsec->sid) {
 		rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
 		if (rc)
 			return rc;
 	}
 
+	inode = file_inode(file);
+	isec = inode->i_security;
 	return avc_has_perm(sid, isec->sid, SECCLASS_SYSTEM,
 				SYSTEM__MODULE_LOAD, &ad);
 }
@@ -3793,7 +3886,7 @@ static void selinux_task_to_inode(struct task_struct *p,
 	u32 sid = task_sid(p);
 
 	isec->sid = sid;
-	isec->initialized = 1;
+	isec->initialized = LABEL_INITIALIZED;
 }
 
 /* Returns error only if unable to parse addresses */
@@ -4112,7 +4205,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
 				      int type, int protocol, int kern)
 {
 	const struct task_security_struct *tsec = current_security();
-	struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
+	struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock));
 	struct sk_security_struct *sksec;
 	int err = 0;
 
@@ -4126,7 +4219,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
 			return err;
 	}
 
-	isec->initialized = 1;
+	isec->initialized = LABEL_INITIALIZED;
 
 	if (sock->sk) {
 		sksec = sock->sk->sk_security;
@@ -4320,12 +4413,12 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
 	if (err)
 		return err;
 
-	newisec = SOCK_INODE(newsock)->i_security;
+	newisec = inode_security_novalidate(SOCK_INODE(newsock));
 
-	isec = SOCK_INODE(sock)->i_security;
+	isec = inode_security_novalidate(SOCK_INODE(sock));
 	newisec->sclass = isec->sclass;
 	newisec->sid = isec->sid;
-	newisec->initialized = 1;
+	newisec->initialized = LABEL_INITIALIZED;
 
 	return 0;
 }
@@ -4660,7 +4753,8 @@ static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
 
 static void selinux_sock_graft(struct sock *sk, struct socket *parent)
 {
-	struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
+	struct inode_security_struct *isec =
+		inode_security_novalidate(SOCK_INODE(parent));
 	struct sk_security_struct *sksec = sk->sk_security;
 
 	if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
@@ -4741,9 +4835,9 @@ static void selinux_secmark_refcount_dec(void)
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,
-				      struct flowi *fl)
+				      struct flowi_common *flic)
 {
-	fl->flowi_secid = req->secid;
+	flic->flowic_secid = req->secid;
 }
 
 static int selinux_tun_dev_alloc_security(void **security)
@@ -4826,38 +4920,59 @@ static int selinux_tun_dev_open(void *security)
 
 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
 {
-	int err = 0;
-	u32 perm;
+	int rc = 0;
+	unsigned int msg_len;
+	unsigned int data_len = skb->len;
+	unsigned char *data = skb->data;
 	struct nlmsghdr *nlh;
 	struct sk_security_struct *sksec = sk->sk_security;
+	u16 sclass = sksec->sclass;
+	u32 perm;
 
-	if (skb->len < NLMSG_HDRLEN) {
-		err = -EINVAL;
-		goto out;
-	}
-	nlh = nlmsg_hdr(skb);
+	while (data_len >= nlmsg_total_size(0)) {
+		nlh = (struct nlmsghdr *)data;
 
-	err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
-	if (err) {
-		if (err == -EINVAL) {
-			printk(KERN_WARNING
-			       "SELinux: unrecognized netlink message:"
-			       " protocol=%hu nlmsg_type=%hu sclass=%s\n",
-			       sk->sk_protocol, nlh->nlmsg_type,
-			       secclass_map[sksec->sclass - 1].name);
-			if (!selinux_enforcing || security_get_allow_unknown())
-				err = 0;
+		/* NOTE: the nlmsg_len field isn't reliably set by some netlink
+		 *       users which means we can't reject skb's with bogus
+		 *       length fields; our solution is to follow what
+		 *       netlink_rcv_skb() does and simply skip processing at
+		 *       messages with length fields that are clearly junk
+		 */
+		if (nlh->nlmsg_len < NLMSG_HDRLEN || nlh->nlmsg_len > data_len)
+			return 0;
+
+		rc = selinux_nlmsg_lookup(sclass, nlh->nlmsg_type, &perm);
+		if (rc == 0) {
+			rc = sock_has_perm(current, sk, perm);
+			if (rc)
+				return rc;
+		} else if (rc == -EINVAL) {
+			/* -EINVAL is a missing msg/perm mapping */
+			pr_warn_ratelimited("SELinux: unrecognized netlink"
+				" message: protocol=%hu nlmsg_type=%hu sclass=%s"
+				" pid=%d comm=%s\n",
+				sk->sk_protocol, nlh->nlmsg_type,
+				secclass_map[sclass - 1].name,
+				task_pid_nr(current), current->comm);
+			if (selinux_enforcing && !security_get_allow_unknown())
+				return rc;
+			rc = 0;
+		} else if (rc == -ENOENT) {
+			/* -ENOENT is a missing socket/class mapping, ignore */
+			rc = 0;
+		} else {
+			return rc;
 		}
 
-		/* Ignore */
-		if (err == -ENOENT)
-			err = 0;
-		goto out;
+		/* move to the next message after applying netlink padding */
+		msg_len = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (msg_len >= data_len)
+			return 0;
+		data_len -= msg_len;
+		data += msg_len;
 	}
 
-	err = sock_has_perm(current, sk, perm);
-out:
-	return err;
+	return rc;
 }
 
 #ifdef CONFIG_NETFILTER
@@ -4993,7 +5108,7 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
 	struct common_audit_data ad;
 	struct lsm_network_audit net = {0,};
 	char *addrp;
-	u8 proto;
+	u8 proto = 0;
 
 	if (sk == NULL)
 		return NF_ACCEPT;
@@ -5817,6 +5932,15 @@ static void selinux_release_secctx(char *secdata, u32 seclen)
 	kfree(secdata);
 }
 
+static void selinux_inode_invalidate_secctx(struct inode *inode)
+{
+	struct inode_security_struct *isec = inode->i_security;
+
+	mutex_lock(&isec->lock);
+	isec->initialized = LABEL_INVALID;
+	mutex_unlock(&isec->lock);
+}
+
 /*
  *	called with inode->i_mutex locked
  */
@@ -5911,6 +6035,139 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
 
 #endif
 
+#ifdef CONFIG_BPF_SYSCALL
+static int selinux_bpf(int cmd, union bpf_attr *attr,
+				     unsigned int size)
+{
+	u32 sid = current_sid();
+	int ret;
+
+	switch (cmd) {
+	case BPF_MAP_CREATE:
+		ret = avc_has_perm(sid, sid, SECCLASS_BPF, BPF__MAP_CREATE,
+				   NULL);
+		break;
+	case BPF_PROG_LOAD:
+		ret = avc_has_perm(sid, sid, SECCLASS_BPF, BPF__PROG_LOAD,
+				   NULL);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+
+	return ret;
+}
+
+static u32 bpf_map_fmode_to_av(fmode_t fmode)
+{
+	u32 av = 0;
+
+	if (fmode & FMODE_READ)
+		av |= BPF__MAP_READ;
+	if (fmode & FMODE_WRITE)
+		av |= BPF__MAP_WRITE;
+	return av;
+}
+
+/* This function will check the file pass through unix socket or binder to see
+ * if it is a bpf related object. And apply correspinding checks on the bpf
+ * object based on the type. The bpf maps and programs, not like other files and
+ * socket, are using a shared anonymous inode inside the kernel as their inode.
+ * So checking that inode cannot identify if the process have privilege to
+ * access the bpf object and that's why we have to add this additional check in
+ * selinux_file_receive and selinux_binder_transfer_files.
+ */
+static int bpf_fd_pass(struct file *file, u32 sid)
+{
+	struct bpf_security_struct *bpfsec;
+	struct bpf_prog *prog;
+	struct bpf_map *map;
+	int ret;
+
+	if (file->f_op == &bpf_map_fops) {
+		map = file->private_data;
+		bpfsec = map->security;
+		ret = avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
+				   bpf_map_fmode_to_av(file->f_mode), NULL);
+		if (ret)
+			return ret;
+	} else if (file->f_op == &bpf_prog_fops) {
+		prog = file->private_data;
+		bpfsec = prog->aux->security;
+		ret = avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
+				   BPF__PROG_RUN, NULL);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+static int selinux_bpf_map(struct bpf_map *map, fmode_t fmode)
+{
+	u32 sid = current_sid();
+	struct bpf_security_struct *bpfsec;
+
+	bpfsec = map->security;
+	return avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
+			    bpf_map_fmode_to_av(fmode), NULL);
+}
+
+static int selinux_bpf_prog(struct bpf_prog *prog)
+{
+	u32 sid = current_sid();
+	struct bpf_security_struct *bpfsec;
+
+	bpfsec = prog->aux->security;
+	return avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
+			    BPF__PROG_RUN, NULL);
+}
+
+static int selinux_bpf_map_alloc(struct bpf_map *map)
+{
+	struct bpf_security_struct *bpfsec;
+
+	bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
+	if (!bpfsec)
+		return -ENOMEM;
+
+	bpfsec->sid = current_sid();
+	map->security = bpfsec;
+
+	return 0;
+}
+
+static void selinux_bpf_map_free(struct bpf_map *map)
+{
+	struct bpf_security_struct *bpfsec = map->security;
+
+	map->security = NULL;
+	kfree(bpfsec);
+}
+
+static int selinux_bpf_prog_alloc(struct bpf_prog_aux *aux)
+{
+	struct bpf_security_struct *bpfsec;
+
+	bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
+	if (!bpfsec)
+		return -ENOMEM;
+
+	bpfsec->sid = current_sid();
+	aux->security = bpfsec;
+
+	return 0;
+}
+
+static void selinux_bpf_prog_free(struct bpf_prog_aux *aux)
+{
+	struct bpf_security_struct *bpfsec = aux->security;
+
+	aux->security = NULL;
+	kfree(bpfsec);
+}
+#endif
+
 static struct security_hook_list selinux_hooks[] = {
 	LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr),
 	LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction),
@@ -6049,6 +6306,7 @@ static struct security_hook_list selinux_hooks[] = {
 	LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx),
 	LSM_HOOK_INIT(secctx_to_secid, selinux_secctx_to_secid),
 	LSM_HOOK_INIT(release_secctx, selinux_release_secctx),
+	LSM_HOOK_INIT(inode_invalidate_secctx, selinux_inode_invalidate_secctx),
 	LSM_HOOK_INIT(inode_notifysecctx, selinux_inode_notifysecctx),
 	LSM_HOOK_INIT(inode_setsecctx, selinux_inode_setsecctx),
 	LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx),
@@ -6121,6 +6379,16 @@ static struct security_hook_list selinux_hooks[] = {
 	LSM_HOOK_INIT(audit_rule_match, selinux_audit_rule_match),
 	LSM_HOOK_INIT(audit_rule_free, selinux_audit_rule_free),
 #endif
+
+#ifdef CONFIG_BPF_SYSCALL
+	LSM_HOOK_INIT(bpf, selinux_bpf),
+	LSM_HOOK_INIT(bpf_map, selinux_bpf_map),
+	LSM_HOOK_INIT(bpf_prog, selinux_bpf_prog),
+	LSM_HOOK_INIT(bpf_map_alloc_security, selinux_bpf_map_alloc),
+	LSM_HOOK_INIT(bpf_prog_alloc_security, selinux_bpf_prog_alloc),
+	LSM_HOOK_INIT(bpf_map_free_security, selinux_bpf_map_free),
+	LSM_HOOK_INIT(bpf_prog_free_security, selinux_bpf_prog_free),
+#endif
 };
 
 static __init int selinux_init(void)