Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:
 "Nothing major for this kernel, just maintenance updates"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (21 commits)
  apparmor: add the ability to report a sha1 hash of loaded policy
  apparmor: export set of capabilities supported by the apparmor module
  apparmor: add the profile introspection file to interface
  apparmor: add an optional profile attachment string for profiles
  apparmor: add interface files for profiles and namespaces
  apparmor: allow setting any profile into the unconfined state
  apparmor: make free_profile available outside of policy.c
  apparmor: rework namespace free path
  apparmor: update how unconfined is handled
  apparmor: change how profile replacement update is done
  apparmor: convert profile lists to RCU based locking
  apparmor: provide base for multiple profiles to be replaced at once
  apparmor: add a features/policy dir to interface
  apparmor: enable users to query whether apparmor is enabled
  apparmor: remove minimum size check for vmalloc()
  Smack: parse multiple rules per write to load2, up to PAGE_SIZE-1 bytes
  Smack: network label match fix
  security: smack: add a hash table to quicken smk_find_entry()
  security: smack: fix memleak in smk_write_rules_list()
  xattr: Constify ->name member of "struct xattr".
  ...

fs/ocfs2/xattr.h

@@ -32,7 +32,7 @@ enum ocfs2_xattr_type {
 
 struct ocfs2_security_xattr_info {
 	int enable;
-	char *name;
+	const char *name;
 	void *value;
 	size_t value_len;
 };

include/linux/security.h

@@ -1492,7 +1492,7 @@ struct security_operations {
 	int (*inode_alloc_security) (struct inode *inode);
 	void (*inode_free_security) (struct inode *inode);
 	int (*inode_init_security) (struct inode *inode, struct inode *dir,
-				    const struct qstr *qstr, char **name,
+				    const struct qstr *qstr, const char **name,
 				    void **value, size_t *len);
 	int (*inode_create) (struct inode *dir,
 			     struct dentry *dentry, umode_t mode);
@@ -1770,7 +1770,7 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
 				 const struct qstr *qstr,
 				 initxattrs initxattrs, void *fs_data);
 int security_old_inode_init_security(struct inode *inode, struct inode *dir,
-				     const struct qstr *qstr, char **name,
+				     const struct qstr *qstr, const char **name,
 				     void **value, size_t *len);
 int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode);
 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
@@ -2094,8 +2094,8 @@ static inline int security_inode_init_security(struct inode *inode,
 static inline int security_old_inode_init_security(struct inode *inode,
 						   struct inode *dir,
 						   const struct qstr *qstr,
-						   char **name, void **value,
-						   size_t *len)
+						   const char **name,
+						   void **value, size_t *len)
 {
 	return -EOPNOTSUPP;
 }

include/linux/xattr.h

@@ -31,7 +31,7 @@ struct xattr_handler {
 };
 
 struct xattr {
-	char *name;
+	const char *name;
 	void *value;
 	size_t value_len;
 };

include/uapi/linux/reiserfs_xattr.h

@@ -16,7 +16,7 @@ struct reiserfs_xattr_header {
 };
 
 struct reiserfs_security_handle {
-	char *name;
+	const char *name;
 	void *value;
 	size_t length;
 };

security/apparmor/Kconfig

@@ -29,3 +29,15 @@ config SECURITY_APPARMOR_BOOTPARAM_VALUE
 	  boot.
 
 	  If you are unsure how to answer this question, answer 1.
+
+config SECURITY_APPARMOR_HASH
+	bool "SHA1 hash of loaded profiles"
+	depends on SECURITY_APPARMOR
+	depends on CRYPTO
+	select CRYPTO_SHA1
+	default y
+
+	help
+	  This option selects whether sha1 hashing is done against loaded
+          profiles and exported for inspection to user space via the apparmor
+          filesystem.

security/apparmor/Makefile

@@ -5,6 +5,7 @@ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o
 apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \
               path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \
               resource.o sid.o file.o
+apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o
 
 clean-files := capability_names.h rlim_names.h
 
@@ -18,7 +19,11 @@ quiet_cmd_make-caps = GEN     $@
 cmd_make-caps = echo "static const char *const capability_names[] = {" > $@ ;\
 	sed $< >>$@ -r -n -e '/CAP_FS_MASK/d' \
 	-e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/[\2] = "\L\1",/p';\
-	echo "};" >> $@
+	echo "};" >> $@ ;\
+	echo -n '\#define AA_FS_CAPS_MASK "' >> $@ ;\
+	sed $< -r -n -e '/CAP_FS_MASK/d' \
+	    -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/\L\1/p' | \
+	     tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@
 
 
 # Build a lower case string table of rlimit names.

security/apparmor/apparmorfs.c

@@ -12,6 +12,7 @@
  * License.
  */
 
+#include <linux/ctype.h>
 #include <linux/security.h>
 #include <linux/vmalloc.h>
 #include <linux/module.h>
@@ -19,14 +20,55 @@
 #include <linux/uaccess.h>
 #include <linux/namei.h>
 #include <linux/capability.h>
+#include <linux/rcupdate.h>
 
 #include "include/apparmor.h"
 #include "include/apparmorfs.h"
 #include "include/audit.h"
 #include "include/context.h"
+#include "include/crypto.h"
 #include "include/policy.h"
 #include "include/resource.h"
 
+/**
+ * aa_mangle_name - mangle a profile name to std profile layout form
+ * @name: profile name to mangle  (NOT NULL)
+ * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
+ *
+ * Returns: length of mangled name
+ */
+static int mangle_name(char *name, char *target)
+{
+	char *t = target;
+
+	while (*name == '/' || *name == '.')
+		name++;
+
+	if (target) {
+		for (; *name; name++) {
+			if (*name == '/')
+				*(t)++ = '.';
+			else if (isspace(*name))
+				*(t)++ = '_';
+			else if (isalnum(*name) || strchr("._-", *name))
+				*(t)++ = *name;
+		}
+
+		*t = 0;
+	} else {
+		int len = 0;
+		for (; *name; name++) {
+			if (isalnum(*name) || isspace(*name) ||
+			    strchr("/._-", *name))
+				len++;
+		}
+
+		return len;
+	}
+
+	return t - target;
+}
+
 /**
  * aa_simple_write_to_buffer - common routine for getting policy from user
  * @op: operation doing the user buffer copy
@@ -182,8 +224,567 @@ const struct file_operations aa_fs_seq_file_ops = {
 	.release	= single_release,
 };
 
-/** Base file system setup **/
+static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
+				  int (*show)(struct seq_file *, void *))
+{
+	struct aa_replacedby *r = aa_get_replacedby(inode->i_private);
+	int error = single_open(file, show, r);
+
+	if (error) {
+		file->private_data = NULL;
+		aa_put_replacedby(r);
+	}
+
+	return error;
+}
+
+static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = (struct seq_file *) file->private_data;
+	if (seq)
+		aa_put_replacedby(seq->private);
+	return single_release(inode, file);
+}
+
+static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
+}
+
+static const struct file_operations aa_fs_profname_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profname_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
+}
+
+static const struct file_operations aa_fs_profmode_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profmode_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	if (profile->attach)
+		seq_printf(seq, "%s\n", profile->attach);
+	else if (profile->xmatch)
+		seq_puts(seq, "<unknown>\n");
+	else
+		seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
+}
+
+static const struct file_operations aa_fs_profattach_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profattach_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	unsigned int i, size = aa_hash_size();
+
+	if (profile->hash) {
+		for (i = 0; i < size; i++)
+			seq_printf(seq, "%.2x", profile->hash[i]);
+		seq_puts(seq, "\n");
+	}
+
+	return 0;
+}
+
+static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aa_fs_seq_hash_show, inode->i_private);
+}
+
+static const struct file_operations aa_fs_seq_hash_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_hash_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/** fns to setup dynamic per profile/namespace files **/
+void __aa_fs_profile_rmdir(struct aa_profile *profile)
+{
+	struct aa_profile *child;
+	int i;
+
+	if (!profile)
+		return;
+
+	list_for_each_entry(child, &profile->base.profiles, base.list)
+		__aa_fs_profile_rmdir(child);
+
+	for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
+		struct aa_replacedby *r;
+		if (!profile->dents[i])
+			continue;
+
+		r = profile->dents[i]->d_inode->i_private;
+		securityfs_remove(profile->dents[i]);
+		aa_put_replacedby(r);
+		profile->dents[i] = NULL;
+	}
+}
+
+void __aa_fs_profile_migrate_dents(struct aa_profile *old,
+				   struct aa_profile *new)
+{
+	int i;
+
+	for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
+		new->dents[i] = old->dents[i];
+		old->dents[i] = NULL;
+	}
+}
+
+static struct dentry *create_profile_file(struct dentry *dir, const char *name,
+					  struct aa_profile *profile,
+					  const struct file_operations *fops)
+{
+	struct aa_replacedby *r = aa_get_replacedby(profile->replacedby);
+	struct dentry *dent;
+
+	dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops);
+	if (IS_ERR(dent))
+		aa_put_replacedby(r);
+
+	return dent;
+}
+
+/* requires lock be held */
+int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
+{
+	struct aa_profile *child;
+	struct dentry *dent = NULL, *dir;
+	int error;
+
+	if (!parent) {
+		struct aa_profile *p;
+		p = aa_deref_parent(profile);
+		dent = prof_dir(p);
+		/* adding to parent that previously didn't have children */
+		dent = securityfs_create_dir("profiles", dent);
+		if (IS_ERR(dent))
+			goto fail;
+		prof_child_dir(p) = parent = dent;
+	}
+
+	if (!profile->dirname) {
+		int len, id_len;
+		len = mangle_name(profile->base.name, NULL);
+		id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
+
+		profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
+		if (!profile->dirname)
+			goto fail;
+
+		mangle_name(profile->base.name, profile->dirname);
+		sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
+	}
+
+	dent = securityfs_create_dir(profile->dirname, parent);
+	if (IS_ERR(dent))
+		goto fail;
+	prof_dir(profile) = dir = dent;
+
+	dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_NAME] = dent;
+
+	dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_MODE] = dent;
+
+	dent = create_profile_file(dir, "attach", profile,
+				   &aa_fs_profattach_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_ATTACH] = dent;
+
+	if (profile->hash) {
+		dent = create_profile_file(dir, "sha1", profile,
+					   &aa_fs_seq_hash_fops);
+		if (IS_ERR(dent))
+			goto fail;
+		profile->dents[AAFS_PROF_HASH] = dent;
+	}
+
+	list_for_each_entry(child, &profile->base.profiles, base.list) {
+		error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aa_fs_profile_rmdir(profile);
+
+	return error;
+}
+
+void __aa_fs_namespace_rmdir(struct aa_namespace *ns)
+{
+	struct aa_namespace *sub;
+	struct aa_profile *child;
+	int i;
+
+	if (!ns)
+		return;
+
+	list_for_each_entry(child, &ns->base.profiles, base.list)
+		__aa_fs_profile_rmdir(child);
+
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock(&sub->lock);
+		__aa_fs_namespace_rmdir(sub);
+		mutex_unlock(&sub->lock);
+	}
 
+	for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
+		securityfs_remove(ns->dents[i]);
+		ns->dents[i] = NULL;
+	}
+}
+
+int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
+			    const char *name)
+{
+	struct aa_namespace *sub;
+	struct aa_profile *child;
+	struct dentry *dent, *dir;
+	int error;
+
+	if (!name)
+		name = ns->base.name;
+
+	dent = securityfs_create_dir(name, parent);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_dir(ns) = dir = dent;
+
+	dent = securityfs_create_dir("profiles", dir);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_subprofs_dir(ns) = dent;
+
+	dent = securityfs_create_dir("namespaces", dir);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_subns_dir(ns) = dent;
+
+	list_for_each_entry(child, &ns->base.profiles, base.list) {
+		error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
+		if (error)
+			goto fail2;
+	}
+
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock(&sub->lock);
+		error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL);
+		mutex_unlock(&sub->lock);
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aa_fs_namespace_rmdir(ns);
+
+	return error;
+}
+
+
+#define list_entry_next(pos, member) \
+	list_entry(pos->member.next, typeof(*pos), member)
+#define list_entry_is_head(pos, head, member) (&pos->member == (head))
+
+/**
+ * __next_namespace - find the next namespace to list
+ * @root: root namespace to stop search at (NOT NULL)
+ * @ns: current ns position (NOT NULL)
+ *
+ * Find the next namespace from @ns under @root and handle all locking needed
+ * while switching current namespace.
+ *
+ * Returns: next namespace or NULL if at last namespace under @root
+ * Requires: ns->parent->lock to be held
+ * NOTE: will not unlock root->lock
+ */
+static struct aa_namespace *__next_namespace(struct aa_namespace *root,
+					     struct aa_namespace *ns)
+{
+	struct aa_namespace *parent, *next;
+
+	/* is next namespace a child */
+	if (!list_empty(&ns->sub_ns)) {
+		next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
+		mutex_lock(&next->lock);
+		return next;
+	}
+
+	/* check if the next ns is a sibling, parent, gp, .. */
+	parent = ns->parent;
+	while (parent) {
+		mutex_unlock(&ns->lock);
+		next = list_entry_next(ns, base.list);
+		if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
+			mutex_lock(&next->lock);
+			return next;
+		}
+		if (parent == root)
+			return NULL;
+		ns = parent;
+		parent = parent->parent;
+	}
+
+	return NULL;
+}
+
+/**
+ * __first_profile - find the first profile in a namespace
+ * @root: namespace that is root of profiles being displayed (NOT NULL)
+ * @ns: namespace to start in   (NOT NULL)
+ *
+ * Returns: unrefcounted profile or NULL if no profile
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__first_profile(struct aa_namespace *root,
+					  struct aa_namespace *ns)
+{
+	for (; ns; ns = __next_namespace(root, ns)) {
+		if (!list_empty(&ns->base.profiles))
+			return list_first_entry(&ns->base.profiles,
+						struct aa_profile, base.list);
+	}
+	return NULL;
+}
+
+/**
+ * __next_profile - step to the next profile in a profile tree
+ * @profile: current profile in tree (NOT NULL)
+ *
+ * Perform a depth first traversal on the profile tree in a namespace
+ *
+ * Returns: next profile or NULL if done
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__next_profile(struct aa_profile *p)
+{
+	struct aa_profile *parent;
+	struct aa_namespace *ns = p->ns;
+
+	/* is next profile a child */
+	if (!list_empty(&p->base.profiles))
+		return list_first_entry(&p->base.profiles, typeof(*p),
+					base.list);
+
+	/* is next profile a sibling, parent sibling, gp, sibling, .. */
+	parent = rcu_dereference_protected(p->parent,
+					   mutex_is_locked(&p->ns->lock));
+	while (parent) {
+		p = list_entry_next(p, base.list);
+		if (!list_entry_is_head(p, &parent->base.profiles, base.list))
+			return p;
+		p = parent;
+		parent = rcu_dereference_protected(parent->parent,
+					    mutex_is_locked(&parent->ns->lock));
+	}
+
+	/* is next another profile in the namespace */
+	p = list_entry_next(p, base.list);
+	if (!list_entry_is_head(p, &ns->base.profiles, base.list))
+		return p;
+
+	return NULL;
+}
+
+/**
+ * next_profile - step to the next profile in where ever it may be
+ * @root: root namespace  (NOT NULL)
+ * @profile: current profile  (NOT NULL)
+ *
+ * Returns: next profile or NULL if there isn't one
+ */
+static struct aa_profile *next_profile(struct aa_namespace *root,
+				       struct aa_profile *profile)
+{
+	struct aa_profile *next = __next_profile(profile);
+	if (next)
+		return next;
+
+	/* finished all profiles in namespace move to next namespace */
+	return __first_profile(root, __next_namespace(root, profile->ns));
+}
+
+/**
+ * p_start - start a depth first traversal of profile tree
+ * @f: seq_file to fill
+ * @pos: current position
+ *
+ * Returns: first profile under current namespace or NULL if none found
+ *
+ * acquires first ns->lock
+ */
+static void *p_start(struct seq_file *f, loff_t *pos)
+{
+	struct aa_profile *profile = NULL;
+	struct aa_namespace *root = aa_current_profile()->ns;
+	loff_t l = *pos;
+	f->private = aa_get_namespace(root);
+
+
+	/* find the first profile */
+	mutex_lock(&root->lock);
+	profile = __first_profile(root, root);
+
+	/* skip to position */
+	for (; profile && l > 0; l--)
+		profile = next_profile(root, profile);
+
+	return profile;
+}
+
+/**
+ * p_next - read the next profile entry
+ * @f: seq_file to fill
+ * @p: profile previously returned
+ * @pos: current position
+ *
+ * Returns: next profile after @p or NULL if none
+ *
+ * may acquire/release locks in namespace tree as necessary
+ */
+static void *p_next(struct seq_file *f, void *p, loff_t *pos)
+{
+	struct aa_profile *profile = p;
+	struct aa_namespace *ns = f->private;
+	(*pos)++;
+
+	return next_profile(ns, profile);
+}
+
+/**
+ * p_stop - stop depth first traversal
+ * @f: seq_file we are filling
+ * @p: the last profile writen
+ *
+ * Release all locking done by p_start/p_next on namespace tree
+ */
+static void p_stop(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = p;
+	struct aa_namespace *root = f->private, *ns;
+
+	if (profile) {
+		for (ns = profile->ns; ns && ns != root; ns = ns->parent)
+			mutex_unlock(&ns->lock);
+	}
+	mutex_unlock(&root->lock);
+	aa_put_namespace(root);
+}
+
+/**
+ * seq_show_profile - show a profile entry
+ * @f: seq_file to file
+ * @p: current position (profile)    (NOT NULL)
+ *
+ * Returns: error on failure
+ */
+static int seq_show_profile(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = (struct aa_profile *)p;
+	struct aa_namespace *root = f->private;
+
+	if (profile->ns != root)
+		seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
+	seq_printf(f, "%s (%s)\n", profile->base.hname,
+		   aa_profile_mode_names[profile->mode]);
+
+	return 0;
+}
+
+static const struct seq_operations aa_fs_profiles_op = {
+	.start = p_start,
+	.next = p_next,
+	.stop = p_stop,
+	.show = seq_show_profile,
+};
+
+static int profiles_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &aa_fs_profiles_op);
+}
+
+static int profiles_release(struct inode *inode, struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+static const struct file_operations aa_fs_profiles_fops = {
+	.open = profiles_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = profiles_release,
+};
+
+
+/** Base file system setup **/
 static struct aa_fs_entry aa_fs_entry_file[] = {
 	AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
 				  "link lock"),
@@ -198,11 +799,18 @@ static struct aa_fs_entry aa_fs_entry_domain[] = {
 	{ }
 };
 
+static struct aa_fs_entry aa_fs_entry_policy[] = {
+	AA_FS_FILE_BOOLEAN("set_load",          1),
+	{}
+};
+
 static struct aa_fs_entry aa_fs_entry_features[] = {
+	AA_FS_DIR("policy",			aa_fs_entry_policy),
 	AA_FS_DIR("domain",			aa_fs_entry_domain),
 	AA_FS_DIR("file",			aa_fs_entry_file),
 	AA_FS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
 	AA_FS_DIR("rlimit",			aa_fs_entry_rlimit),
+	AA_FS_DIR("caps",			aa_fs_entry_caps),
 	{ }
 };
 
@@ -210,6 +818,7 @@ static struct aa_fs_entry aa_fs_entry_apparmor[] = {
 	AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
 	AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
 	AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
+	AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
 	AA_FS_DIR("features", aa_fs_entry_features),
 	{ }
 };
@@ -240,6 +849,7 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
 	return error;
 }
 
+static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
 /**
  * aafs_create_dir - recursively create a directory entry in the securityfs
  * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
@@ -250,17 +860,16 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
 				  struct dentry *parent)
 {
-	int error;
 	struct aa_fs_entry *fs_file;
+	struct dentry *dir;
+	int error;
 
-	fs_dir->dentry = securityfs_create_dir(fs_dir->name, parent);
-	if (IS_ERR(fs_dir->dentry)) {
-		error = PTR_ERR(fs_dir->dentry);
-		fs_dir->dentry = NULL;
-		goto failed;
-	}
+	dir = securityfs_create_dir(fs_dir->name, parent);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	fs_dir->dentry = dir;
 
-	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
 		if (fs_file->v_type == AA_FS_TYPE_DIR)
 			error = aafs_create_dir(fs_file, fs_dir->dentry);
 		else
@@ -272,6 +881,8 @@ static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
 	return 0;
 
 failed:
+	aafs_remove_dir(fs_dir);
+
 	return error;
 }
 
@@ -296,7 +907,7 @@ static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
 {
 	struct aa_fs_entry *fs_file;
 
-	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
 		if (fs_file->v_type == AA_FS_TYPE_DIR)
 			aafs_remove_dir(fs_file);
 		else
@@ -340,6 +951,11 @@ static int __init aa_create_aafs(void)
 	if (error)
 		goto error;
 
+	error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry,
+					"policy");
+	if (error)
+		goto error;
+
 	/* TODO: add support for apparmorfs_null and apparmorfs_mnt */
 
 	/* Report that AppArmor fs is enabled */

security/apparmor/capability.c

@@ -27,6 +27,11 @@
  */
 #include "capability_names.h"
 
+struct aa_fs_entry aa_fs_entry_caps[] = {
+	AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
+	{ }
+};
+
 struct audit_cache {
 	struct aa_profile *profile;
 	kernel_cap_t caps;

security/apparmor/context.c

@@ -112,9 +112,9 @@ int aa_replace_current_profile(struct aa_profile *profile)
 		aa_clear_task_cxt_trans(cxt);
 
 	/* be careful switching cxt->profile, when racing replacement it
-	 * is possible that cxt->profile->replacedby is the reference keeping
-	 * @profile valid, so make sure to get its reference before dropping
-	 * the reference on cxt->profile */
+	 * is possible that cxt->profile->replacedby->profile is the reference
+	 * keeping @profile valid, so make sure to get its reference before
+	 * dropping the reference on cxt->profile */
 	aa_get_profile(profile);
 	aa_put_profile(cxt->profile);
 	cxt->profile = profile;
@@ -175,7 +175,7 @@ int aa_set_current_hat(struct aa_profile *profile, u64 token)
 		abort_creds(new);
 		return -EACCES;
 	}
-	cxt->profile = aa_get_profile(aa_newest_version(profile));
+	cxt->profile = aa_get_newest_profile(profile);
 	/* clear exec on switching context */
 	aa_put_profile(cxt->onexec);
 	cxt->onexec = NULL;
@@ -212,14 +212,8 @@ int aa_restore_previous_profile(u64 token)
 	}
 
 	aa_put_profile(cxt->profile);
-	cxt->profile = aa_newest_version(cxt->previous);
+	cxt->profile = aa_get_newest_profile(cxt->previous);
 	BUG_ON(!cxt->profile);
-	if (unlikely(cxt->profile != cxt->previous)) {
-		aa_get_profile(cxt->profile);
-		aa_put_profile(cxt->previous);
-	}
-	/* ref has been transfered so avoid putting ref in clear_task_cxt */
-	cxt->previous = NULL;
 	/* clear exec && prev information when restoring to previous context */
 	aa_clear_task_cxt_trans(cxt);
 

security/apparmor/crypto.c

@@ -0,0 +1,97 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ * Fns to provide a checksum of policy that has been loaded this can be
+ * compared to userspace policy compiles to check loaded policy is what
+ * it should be.
+ */
+
+#include <linux/crypto.h>
+
+#include "include/apparmor.h"
+#include "include/crypto.h"
+
+static unsigned int apparmor_hash_size;
+
+static struct crypto_hash *apparmor_tfm;
+
+unsigned int aa_hash_size(void)
+{
+	return apparmor_hash_size;
+}
+
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+			 size_t len)
+{
+	struct scatterlist sg[2];
+	struct hash_desc desc = {
+		.tfm = apparmor_tfm,
+		.flags = 0
+	};
+	int error = -ENOMEM;
+	u32 le32_version = cpu_to_le32(version);
+
+	if (!apparmor_tfm)
+		return 0;
+
+	sg_init_table(sg, 2);
+	sg_set_buf(&sg[0], &le32_version, 4);
+	sg_set_buf(&sg[1], (u8 *) start, len);
+
+	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+	if (!profile->hash)
+		goto fail;
+
+	error = crypto_hash_init(&desc);
+	if (error)
+		goto fail;
+	error = crypto_hash_update(&desc, &sg[0], 4);
+	if (error)
+		goto fail;
+	error = crypto_hash_update(&desc, &sg[1], len);
+	if (error)
+		goto fail;
+	error = crypto_hash_final(&desc, profile->hash);
+	if (error)
+		goto fail;
+
+	return 0;
+
+fail:
+	kfree(profile->hash);
+	profile->hash = NULL;
+
+	return error;
+}
+
+static int __init init_profile_hash(void)
+{
+	struct crypto_hash *tfm;
+
+	if (!apparmor_initialized)
+		return 0;
+
+	tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm)) {
+		int error = PTR_ERR(tfm);
+		AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
+		return error;
+	}
+	apparmor_tfm = tfm;
+	apparmor_hash_size = crypto_hash_digestsize(apparmor_tfm);
+
+	aa_info_message("AppArmor sha1 policy hashing enabled");
+
+	return 0;
+}
+
+late_initcall(init_profile_hash);

security/apparmor/domain.c

@@ -144,7 +144,7 @@ static struct aa_profile *__attach_match(const char *name,
 	int len = 0;
 	struct aa_profile *profile, *candidate = NULL;
 
-	list_for_each_entry(profile, head, base.list) {
+	list_for_each_entry_rcu(profile, head, base.list) {
 		if (profile->flags & PFLAG_NULL)
 			continue;
 		if (profile->xmatch && profile->xmatch_len > len) {
@@ -177,9 +177,9 @@ static struct aa_profile *find_attach(struct aa_namespace *ns,
 {
 	struct aa_profile *profile;
 
-	read_lock(&ns->lock);
+	rcu_read_lock();
 	profile = aa_get_profile(__attach_match(name, list));
-	read_unlock(&ns->lock);
+	rcu_read_unlock();
 
 	return profile;
 }
@@ -359,7 +359,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
 	cxt = cred_cxt(bprm->cred);
 	BUG_ON(!cxt);
 
-	profile = aa_get_profile(aa_newest_version(cxt->profile));
+	profile = aa_get_newest_profile(cxt->profile);
 	/*
 	 * get the namespace from the replacement profile as replacement
 	 * can change the namespace
@@ -371,8 +371,8 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
 	error = aa_path_name(&bprm->file->f_path, profile->path_flags, &buffer,
 			     &name, &info);
 	if (error) {
-		if (profile->flags &
-		    (PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED))
+		if (unconfined(profile) ||
+		    (profile->flags & PFLAG_IX_ON_NAME_ERROR))
 			error = 0;
 		name = bprm->filename;
 		goto audit;
@@ -417,7 +417,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
 
 		if (!(cp.allow & AA_MAY_ONEXEC))
 			goto audit;
-		new_profile = aa_get_profile(aa_newest_version(cxt->onexec));
+		new_profile = aa_get_newest_profile(cxt->onexec);
 		goto apply;
 	}
 
@@ -434,7 +434,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
 				new_profile = aa_get_profile(profile);
 				goto x_clear;
 			} else if (perms.xindex & AA_X_UNCONFINED) {
-				new_profile = aa_get_profile(ns->unconfined);
+				new_profile = aa_get_newest_profile(ns->unconfined);
 				info = "ux fallback";
 			} else {
 				error = -ENOENT;
@@ -641,7 +641,10 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
 	if (count) {
 		/* attempting to change into a new hat or switch to a sibling */
 		struct aa_profile *root;
-		root = PROFILE_IS_HAT(profile) ? profile->parent : profile;
+		if (PROFILE_IS_HAT(profile))
+			root = aa_get_profile_rcu(&profile->parent);
+		else
+			root = aa_get_profile(profile);
 
 		/* find first matching hat */
 		for (i = 0; i < count && !hat; i++)
@@ -653,6 +656,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
 					error = -ECHILD;
 				else
 					error = -ENOENT;
+				aa_put_profile(root);
 				goto out;
 			}
 
@@ -667,6 +671,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
 
 			/* freed below */
 			name = new_compound_name(root->base.hname, hats[0]);
+			aa_put_profile(root);
 			target = name;
 			/* released below */
 			hat = aa_new_null_profile(profile, 1);
@@ -676,6 +681,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
 				goto audit;
 			}
 		} else {
+			aa_put_profile(root);
 			target = hat->base.hname;
 			if (!PROFILE_IS_HAT(hat)) {
 				info = "target not hat";

security/apparmor/include/apparmor.h

@@ -78,6 +78,12 @@ static inline void *kvzalloc(size_t size)
 	return __aa_kvmalloc(size, __GFP_ZERO);
 }
 
+/* returns 0 if kref not incremented */
+static inline int kref_get_not0(struct kref *kref)
+{
+	return atomic_inc_not_zero(&kref->refcount);
+}
+
 /**
  * aa_strneq - compare null terminated @str to a non null terminated substring
  * @str: a null terminated string

security/apparmor/include/apparmorfs.h

@@ -61,4 +61,44 @@ extern const struct file_operations aa_fs_seq_file_ops;
 
 extern void __init aa_destroy_aafs(void);
 
+struct aa_profile;
+struct aa_namespace;
+
+enum aafs_ns_type {
+	AAFS_NS_DIR,
+	AAFS_NS_PROFS,
+	AAFS_NS_NS,
+	AAFS_NS_COUNT,
+	AAFS_NS_MAX_COUNT,
+	AAFS_NS_SIZE,
+	AAFS_NS_MAX_SIZE,
+	AAFS_NS_OWNER,
+	AAFS_NS_SIZEOF,
+};
+
+enum aafs_prof_type {
+	AAFS_PROF_DIR,
+	AAFS_PROF_PROFS,
+	AAFS_PROF_NAME,
+	AAFS_PROF_MODE,
+	AAFS_PROF_ATTACH,
+	AAFS_PROF_HASH,
+	AAFS_PROF_SIZEOF,
+};
+
+#define ns_dir(X) ((X)->dents[AAFS_NS_DIR])
+#define ns_subns_dir(X) ((X)->dents[AAFS_NS_NS])
+#define ns_subprofs_dir(X) ((X)->dents[AAFS_NS_PROFS])
+
+#define prof_dir(X) ((X)->dents[AAFS_PROF_DIR])
+#define prof_child_dir(X) ((X)->dents[AAFS_PROF_PROFS])
+
+void __aa_fs_profile_rmdir(struct aa_profile *profile);
+void __aa_fs_profile_migrate_dents(struct aa_profile *old,
+				   struct aa_profile *new);
+int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent);
+void __aa_fs_namespace_rmdir(struct aa_namespace *ns);
+int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
+			    const char *name);
+
 #endif /* __AA_APPARMORFS_H */

security/apparmor/include/audit.h

@@ -27,7 +27,6 @@ struct aa_profile;
 
 extern const char *const audit_mode_names[];
 #define AUDIT_MAX_INDEX 5
-
 enum audit_mode {
 	AUDIT_NORMAL,		/* follow normal auditing of accesses */
 	AUDIT_QUIET_DENIED,	/* quiet all denied access messages */

security/apparmor/include/capability.h

@@ -17,6 +17,8 @@
 
 #include <linux/sched.h>
 
+#include "apparmorfs.h"
+
 struct aa_profile;
 
 /* aa_caps - confinement data for capabilities
@@ -34,6 +36,8 @@ struct aa_caps {
 	kernel_cap_t extended;
 };
 
+extern struct aa_fs_entry aa_fs_entry_caps[];
+
 int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
 	       int audit);
 

security/apparmor/include/context.h

@@ -98,7 +98,7 @@ static inline struct aa_profile *aa_cred_profile(const struct cred *cred)
 {
 	struct aa_task_cxt *cxt = cred_cxt(cred);
 	BUG_ON(!cxt || !cxt->profile);
-	return aa_newest_version(cxt->profile);
+	return cxt->profile;
 }
 
 /**
@@ -152,15 +152,14 @@ static inline struct aa_profile *aa_current_profile(void)
 	struct aa_profile *profile;
 	BUG_ON(!cxt || !cxt->profile);
 
-	profile = aa_newest_version(cxt->profile);
-	/*
-	 * Whether or not replacement succeeds, use newest profile so
-	 * there is no need to update it after replacement.
-	 */
-	if (unlikely((cxt->profile != profile)))
+	if (PROFILE_INVALID(cxt->profile)) {
+		profile = aa_get_newest_profile(cxt->profile);
 		aa_replace_current_profile(profile);
+		aa_put_profile(profile);
+		cxt = current_cxt();
+	}
 
-	return profile;
+	return cxt->profile;
 }
 
 /**

security/apparmor/include/crypto.h

@@ -0,0 +1,36 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __APPARMOR_CRYPTO_H
+#define __APPARMOR_CRYPTO_H
+
+#include "policy.h"
+
+#ifdef CONFIG_SECURITY_APPARMOR_HASH
+unsigned int aa_hash_size(void);
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+			 size_t len);
+#else
+static inline int aa_calc_profile_hash(struct aa_profile *profile, u32 version,
+				       void *start, size_t len)
+{
+	return 0;
+}
+
+static inline unsigned int aa_hash_size(void)
+{
+	return 0;
+}
+#endif
+
+#endif /* __APPARMOR_CRYPTO_H */

security/apparmor/include/policy.h

@@ -29,8 +29,8 @@
 #include "file.h"
 #include "resource.h"
 
-extern const char *const profile_mode_names[];
-#define APPARMOR_NAMES_MAX_INDEX 3
+extern const char *const aa_profile_mode_names[];
+#define APPARMOR_MODE_NAMES_MAX_INDEX 4
 
 #define PROFILE_MODE(_profile, _mode)		\
 	((aa_g_profile_mode == (_mode)) ||	\
@@ -42,6 +42,10 @@ extern const char *const profile_mode_names[];
 
 #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
 
+#define PROFILE_INVALID(_profile) ((_profile)->flags & PFLAG_INVALID)
+
+#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
+
 /*
  * FIXME: currently need a clean way to replace and remove profiles as a
  * set.  It should be done at the namespace level.
@@ -52,17 +56,19 @@ enum profile_mode {
 	APPARMOR_ENFORCE,	/* enforce access rules */
 	APPARMOR_COMPLAIN,	/* allow and log access violations */
 	APPARMOR_KILL,		/* kill task on access violation */
+	APPARMOR_UNCONFINED,	/* profile set to unconfined */
 };
 
 enum profile_flags {
 	PFLAG_HAT = 1,			/* profile is a hat */
-	PFLAG_UNCONFINED = 2,		/* profile is an unconfined profile */
 	PFLAG_NULL = 4,			/* profile is null learning profile */
 	PFLAG_IX_ON_NAME_ERROR = 8,	/* fallback to ix on name lookup fail */
 	PFLAG_IMMUTABLE = 0x10,		/* don't allow changes/replacement */
 	PFLAG_USER_DEFINED = 0x20,	/* user based profile - lower privs */
 	PFLAG_NO_LIST_REF = 0x40,	/* list doesn't keep profile ref */
 	PFLAG_OLD_NULL_TRANS = 0x100,	/* use // as the null transition */
+	PFLAG_INVALID = 0x200,		/* profile replaced/removed */
+	PFLAG_NS_COUNT = 0x400,		/* carries NS ref count */
 
 	/* These flags must correspond with PATH_flags */
 	PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
@@ -73,14 +79,12 @@ struct aa_profile;
 /* struct aa_policy - common part of both namespaces and profiles
  * @name: name of the object
  * @hname - The hierarchical name
- * @count: reference count of the obj
  * @list: list policy object is on
  * @profiles: head of the profiles list contained in the object
  */
 struct aa_policy {
 	char *name;
 	char *hname;
-	struct kref count;
 	struct list_head list;
 	struct list_head profiles;
 };
@@ -106,6 +110,8 @@ struct aa_ns_acct {
  * @unconfined: special unconfined profile for the namespace
  * @sub_ns: list of namespaces under the current namespace.
  * @uniq_null: uniq value used for null learning profiles
+ * @uniq_id: a unique id count for the profiles in the namespace
+ * @dents: dentries for the namespaces file entries in apparmorfs
  *
  * An aa_namespace defines the set profiles that are searched to determine
  * which profile to attach to a task.  Profiles can not be shared between
@@ -124,11 +130,14 @@ struct aa_ns_acct {
 struct aa_namespace {
 	struct aa_policy base;
 	struct aa_namespace *parent;
-	rwlock_t lock;
+	struct mutex lock;
 	struct aa_ns_acct acct;
 	struct aa_profile *unconfined;
 	struct list_head sub_ns;
 	atomic_t uniq_null;
+	long uniq_id;
+
+	struct dentry *dents[AAFS_NS_SIZEOF];
 };
 
 /* struct aa_policydb - match engine for a policy
@@ -142,12 +151,21 @@ struct aa_policydb {
 
 };
 
+struct aa_replacedby {
+	struct kref count;
+	struct aa_profile __rcu *profile;
+};
+
+
 /* struct aa_profile - basic confinement data
  * @base - base components of the profile (name, refcount, lists, lock ...)
+ * @count: reference count of the obj
+ * @rcu: rcu head used when removing from @list
  * @parent: parent of profile
  * @ns: namespace the profile is in
  * @replacedby: is set to the profile that replaced this profile
  * @rename: optional profile name that this profile renamed
+ * @attach: human readable attachment string
  * @xmatch: optional extended matching for unconfined executables names
  * @xmatch_len: xmatch prefix len, used to determine xmatch priority
  * @audit: the auditing mode of the profile
@@ -160,13 +178,15 @@ struct aa_policydb {
  * @caps: capabilities for the profile
  * @rlimits: rlimits for the profile
  *
+ * @dents: dentries for the profiles file entries in apparmorfs
+ * @dirname: name of the profile dir in apparmorfs
+ *
  * The AppArmor profile contains the basic confinement data.  Each profile
  * has a name, and exists in a namespace.  The @name and @exec_match are
  * used to determine profile attachment against unconfined tasks.  All other
  * attachments are determined by profile X transition rules.
  *
- * The @replacedby field is write protected by the profile lock.  Reads
- * are assumed to be atomic, and are done without locking.
+ * The @replacedby struct is write protected by the profile lock.
  *
  * Profiles have a hierarchy where hats and children profiles keep
  * a reference to their parent.
@@ -177,17 +197,20 @@ struct aa_policydb {
  */
 struct aa_profile {
 	struct aa_policy base;
-	struct aa_profile *parent;
+	struct kref count;
+	struct rcu_head rcu;
+	struct aa_profile __rcu *parent;
 
 	struct aa_namespace *ns;
-	struct aa_profile *replacedby;
+	struct aa_replacedby *replacedby;
 	const char *rename;
 
+	const char *attach;
 	struct aa_dfa *xmatch;
 	int xmatch_len;
 	enum audit_mode audit;
-	enum profile_mode mode;
-	u32 flags;
+	long mode;
+	long flags;
 	u32 path_flags;
 	int size;
 
@@ -195,6 +218,10 @@ struct aa_profile {
 	struct aa_file_rules file;
 	struct aa_caps caps;
 	struct aa_rlimit rlimits;
+
+	unsigned char *hash;
+	char *dirname;
+	struct dentry *dents[AAFS_PROF_SIZEOF];
 };
 
 extern struct aa_namespace *root_ns;
@@ -211,43 +238,11 @@ void aa_free_namespace_kref(struct kref *kref);
 struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
 				       const char *name);
 
-static inline struct aa_policy *aa_get_common(struct aa_policy *c)
-{
-	if (c)
-		kref_get(&c->count);
-
-	return c;
-}
-
-/**
- * aa_get_namespace - increment references count on @ns
- * @ns: namespace to increment reference count of (MAYBE NULL)
- *
- * Returns: pointer to @ns, if @ns is NULL returns NULL
- * Requires: @ns must be held with valid refcount when called
- */
-static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
-{
-	if (ns)
-		kref_get(&(ns->base.count));
-
-	return ns;
-}
-
-/**
- * aa_put_namespace - decrement refcount on @ns
- * @ns: namespace to put reference of
- *
- * Decrement reference count of @ns and if no longer in use free it
- */
-static inline void aa_put_namespace(struct aa_namespace *ns)
-{
-	if (ns)
-		kref_put(&ns->base.count, aa_free_namespace_kref);
-}
 
+void aa_free_replacedby_kref(struct kref *kref);
 struct aa_profile *aa_alloc_profile(const char *name);
 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
+void aa_free_profile(struct aa_profile *profile);
 void aa_free_profile_kref(struct kref *kref);
 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
 struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name);
@@ -259,25 +254,13 @@ ssize_t aa_remove_profiles(char *name, size_t size);
 #define PROF_ADD 1
 #define PROF_REPLACE 0
 
-#define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)
+#define unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
 
-/**
- * aa_newest_version - find the newest version of @profile
- * @profile: the profile to check for newer versions of (NOT NULL)
- *
- * Returns: newest version of @profile, if @profile is the newest version
- *          return @profile.
- *
- * NOTE: the profile returned is not refcounted, The refcount on @profile
- * must be held until the caller decides what to do with the returned newest
- * version.
- */
-static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
-{
-	while (profile->replacedby)
-		profile = profile->replacedby;
 
-	return profile;
+static inline struct aa_profile *aa_deref_parent(struct aa_profile *p)
+{
+	return rcu_dereference_protected(p->parent,
+					 mutex_is_locked(&p->ns->lock));
 }
 
 /**
@@ -290,11 +273,65 @@ static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
 static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
 {
 	if (p)
-		kref_get(&(p->base.count));
+		kref_get(&(p->count));
 
 	return p;
 }
 
+/**
+ * aa_get_profile_not0 - increment refcount on profile @p found via lookup
+ * @p: profile  (MAYBE NULL)
+ *
+ * Returns: pointer to @p if @p is NULL will return NULL
+ * Requires: @p must be held with valid refcount when called
+ */
+static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
+{
+	if (p && kref_get_not0(&p->count))
+		return p;
+
+	return NULL;
+}
+
+/**
+ * aa_get_profile_rcu - increment a refcount profile that can be replaced
+ * @p: pointer to profile that can be replaced (NOT NULL)
+ *
+ * Returns: pointer to a refcounted profile.
+ *     else NULL if no profile
+ */
+static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
+{
+	struct aa_profile *c;
+
+	rcu_read_lock();
+	do {
+		c = rcu_dereference(*p);
+	} while (c && !kref_get_not0(&c->count));
+	rcu_read_unlock();
+
+	return c;
+}
+
+/**
+ * aa_get_newest_profile - find the newest version of @profile
+ * @profile: the profile to check for newer versions of
+ *
+ * Returns: refcounted newest version of @profile taking into account
+ *          replacement, renames and removals
+ *          return @profile.
+ */
+static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
+{
+	if (!p)
+		return NULL;
+
+	if (PROFILE_INVALID(p))
+		return aa_get_profile_rcu(&p->replacedby->profile);
+
+	return aa_get_profile(p);
+}
+
 /**
  * aa_put_profile - decrement refcount on profile @p
  * @p: profile  (MAYBE NULL)
@@ -302,7 +339,58 @@ static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
 static inline void aa_put_profile(struct aa_profile *p)
 {
 	if (p)
-		kref_put(&p->base.count, aa_free_profile_kref);
+		kref_put(&p->count, aa_free_profile_kref);
+}
+
+static inline struct aa_replacedby *aa_get_replacedby(struct aa_replacedby *p)
+{
+	if (p)
+		kref_get(&(p->count));
+
+	return p;
+}
+
+static inline void aa_put_replacedby(struct aa_replacedby *p)
+{
+	if (p)
+		kref_put(&p->count, aa_free_replacedby_kref);
+}
+
+/* requires profile list write lock held */
+static inline void __aa_update_replacedby(struct aa_profile *orig,
+					  struct aa_profile *new)
+{
+	struct aa_profile *tmp = rcu_dereference(orig->replacedby->profile);
+	rcu_assign_pointer(orig->replacedby->profile, aa_get_profile(new));
+	orig->flags |= PFLAG_INVALID;
+	aa_put_profile(tmp);
+}
+
+/**
+ * aa_get_namespace - increment references count on @ns
+ * @ns: namespace to increment reference count of (MAYBE NULL)
+ *
+ * Returns: pointer to @ns, if @ns is NULL returns NULL
+ * Requires: @ns must be held with valid refcount when called
+ */
+static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
+{
+	if (ns)
+		aa_get_profile(ns->unconfined);
+
+	return ns;
+}
+
+/**
+ * aa_put_namespace - decrement refcount on @ns
+ * @ns: namespace to put reference of
+ *
+ * Decrement reference count of @ns and if no longer in use free it
+ */
+static inline void aa_put_namespace(struct aa_namespace *ns)
+{
+	if (ns)
+		aa_put_profile(ns->unconfined);
 }
 
 static inline int AUDIT_MODE(struct aa_profile *profile)

security/apparmor/include/policy_unpack.h

@@ -15,6 +15,25 @@
 #ifndef __POLICY_INTERFACE_H
 #define __POLICY_INTERFACE_H
 
-struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns);
+#include <linux/list.h>
+
+struct aa_load_ent {
+	struct list_head list;
+	struct aa_profile *new;
+	struct aa_profile *old;
+	struct aa_profile *rename;
+};
+
+void aa_load_ent_free(struct aa_load_ent *ent);
+struct aa_load_ent *aa_load_ent_alloc(void);
+
+#define PACKED_FLAG_HAT		1
+
+#define PACKED_MODE_ENFORCE	0
+#define PACKED_MODE_COMPLAIN	1
+#define PACKED_MODE_KILL	2
+#define PACKED_MODE_UNCONFINED	3
+
+int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns);
 
 #endif /* __POLICY_INTERFACE_H */

security/apparmor/lib.c

@@ -97,11 +97,6 @@ void *__aa_kvmalloc(size_t size, gfp_t flags)
 	if (size <= (16*PAGE_SIZE))
 		buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
 	if (!buffer) {
-		/* see kvfree for why size must be at least work_struct size
-		 * when allocated via vmalloc
-		 */
-		if (size < sizeof(struct work_struct))
-			size = sizeof(struct work_struct);
 		if (flags & __GFP_ZERO)
 			buffer = vzalloc(size);
 		else

security/apparmor/lsm.c

@@ -508,19 +508,21 @@ static int apparmor_getprocattr(struct task_struct *task, char *name,
 	/* released below */
 	const struct cred *cred = get_task_cred(task);
 	struct aa_task_cxt *cxt = cred_cxt(cred);
+	struct aa_profile *profile = NULL;
 
 	if (strcmp(name, "current") == 0)
-		error = aa_getprocattr(aa_newest_version(cxt->profile),
-				       value);
+		profile = aa_get_newest_profile(cxt->profile);
 	else if (strcmp(name, "prev") == 0  && cxt->previous)
-		error = aa_getprocattr(aa_newest_version(cxt->previous),
-				       value);
+		profile = aa_get_newest_profile(cxt->previous);
 	else if (strcmp(name, "exec") == 0 && cxt->onexec)
-		error = aa_getprocattr(aa_newest_version(cxt->onexec),
-				       value);
+		profile = aa_get_newest_profile(cxt->onexec);
 	else
 		error = -EINVAL;
 
+	if (profile)
+		error = aa_getprocattr(profile, value);
+
+	aa_put_profile(profile);
 	put_cred(cred);
 
 	return error;
@@ -744,7 +746,7 @@ module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
 
 /* Boot time disable flag */
 static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
-module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR);
+module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
 
 static int __init apparmor_enabled_setup(char *str)
 {
@@ -843,7 +845,7 @@ static int param_get_mode(char *buffer, struct kernel_param *kp)
 	if (!apparmor_enabled)
 		return -EINVAL;
 
-	return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]);
+	return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
 }
 
 static int param_set_mode(const char *val, struct kernel_param *kp)
@@ -858,8 +860,8 @@ static int param_set_mode(const char *val, struct kernel_param *kp)
 	if (!val)
 		return -EINVAL;
 
-	for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) {
-		if (strcmp(val, profile_mode_names[i]) == 0) {
+	for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
+		if (strcmp(val, aa_profile_mode_names[i]) == 0) {
 			aa_g_profile_mode = i;
 			return 0;
 		}

security/apparmor/policy.c

@@ -92,10 +92,11 @@
 /* root profile namespace */
 struct aa_namespace *root_ns;
 
-const char *const profile_mode_names[] = {
+const char *const aa_profile_mode_names[] = {
 	"enforce",
 	"complain",
 	"kill",
+	"unconfined",
 };
 
 /**
@@ -141,7 +142,6 @@ static bool policy_init(struct aa_policy *policy, const char *prefix,
 	policy->name = (char *)hname_tail(policy->hname);
 	INIT_LIST_HEAD(&policy->list);
 	INIT_LIST_HEAD(&policy->profiles);
-	kref_init(&policy->count);
 
 	return 1;
 }
@@ -153,13 +153,13 @@ static bool policy_init(struct aa_policy *policy, const char *prefix,
 static void policy_destroy(struct aa_policy *policy)
 {
 	/* still contains profiles -- invalid */
-	if (!list_empty(&policy->profiles)) {
+	if (on_list_rcu(&policy->profiles)) {
 		AA_ERROR("%s: internal error, "
 			 "policy '%s' still contains profiles\n",
 			 __func__, policy->name);
 		BUG();
 	}
-	if (!list_empty(&policy->list)) {
+	if (on_list_rcu(&policy->list)) {
 		AA_ERROR("%s: internal error, policy '%s' still on list\n",
 			 __func__, policy->name);
 		BUG();
@@ -174,7 +174,7 @@ static void policy_destroy(struct aa_policy *policy)
  * @head: list to search  (NOT NULL)
  * @name: name to search for  (NOT NULL)
  *
- * Requires: correct locks for the @head list be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted policy that match @name or NULL if not found
  */
@@ -182,7 +182,7 @@ static struct aa_policy *__policy_find(struct list_head *head, const char *name)
 {
 	struct aa_policy *policy;
 
-	list_for_each_entry(policy, head, list) {
+	list_for_each_entry_rcu(policy, head, list) {
 		if (!strcmp(policy->name, name))
 			return policy;
 	}
@@ -195,7 +195,7 @@ static struct aa_policy *__policy_find(struct list_head *head, const char *name)
  * @str: string to search for  (NOT NULL)
  * @len: length of match required
  *
- * Requires: correct locks for the @head list be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted policy that match @str or NULL if not found
  *
@@ -207,7 +207,7 @@ static struct aa_policy *__policy_strn_find(struct list_head *head,
 {
 	struct aa_policy *policy;
 
-	list_for_each_entry(policy, head, list) {
+	list_for_each_entry_rcu(policy, head, list) {
 		if (aa_strneq(policy->name, str, len))
 			return policy;
 	}
@@ -284,22 +284,19 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
 		goto fail_ns;
 
 	INIT_LIST_HEAD(&ns->sub_ns);
-	rwlock_init(&ns->lock);
+	mutex_init(&ns->lock);
 
 	/* released by free_namespace */
 	ns->unconfined = aa_alloc_profile("unconfined");
 	if (!ns->unconfined)
 		goto fail_unconfined;
 
-	ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR |
-	    PFLAG_IMMUTABLE;
+	ns->unconfined->flags = PFLAG_IX_ON_NAME_ERROR |
+		PFLAG_IMMUTABLE | PFLAG_NS_COUNT;
+	ns->unconfined->mode = APPARMOR_UNCONFINED;
 
-	/*
-	 * released by free_namespace, however __remove_namespace breaks
-	 * the cyclic references (ns->unconfined, and unconfined->ns) and
-	 * replaces with refs to parent namespace unconfined
-	 */
-	ns->unconfined->ns = aa_get_namespace(ns);
+	/* ns and ns->unconfined share ns->unconfined refcount */
+	ns->unconfined->ns = ns;
 
 	atomic_set(&ns->uniq_null, 0);
 
@@ -327,22 +324,11 @@ static void free_namespace(struct aa_namespace *ns)
 	policy_destroy(&ns->base);
 	aa_put_namespace(ns->parent);
 
-	if (ns->unconfined && ns->unconfined->ns == ns)
-		ns->unconfined->ns = NULL;
-
-	aa_put_profile(ns->unconfined);
+	ns->unconfined->ns = NULL;
+	aa_free_profile(ns->unconfined);
 	kzfree(ns);
 }
 
-/**
- * aa_free_namespace_kref - free aa_namespace by kref (see aa_put_namespace)
- * @kr: kref callback for freeing of a namespace  (NOT NULL)
- */
-void aa_free_namespace_kref(struct kref *kref)
-{
-	free_namespace(container_of(kref, struct aa_namespace, base.count));
-}
-
 /**
  * __aa_find_namespace - find a namespace on a list by @name
  * @head: list to search for namespace on  (NOT NULL)
@@ -350,7 +336,7 @@ void aa_free_namespace_kref(struct kref *kref)
  *
  * Returns: unrefcounted namespace
  *
- * Requires: ns lock be held
+ * Requires: rcu_read_lock be held
  */
 static struct aa_namespace *__aa_find_namespace(struct list_head *head,
 						const char *name)
@@ -373,9 +359,9 @@ struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
 {
 	struct aa_namespace *ns = NULL;
 
-	read_lock(&root->lock);
+	rcu_read_lock();
 	ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
-	read_unlock(&root->lock);
+	rcu_read_unlock();
 
 	return ns;
 }
@@ -392,7 +378,7 @@ static struct aa_namespace *aa_prepare_namespace(const char *name)
 
 	root = aa_current_profile()->ns;
 
-	write_lock(&root->lock);
+	mutex_lock(&root->lock);
 
 	/* if name isn't specified the profile is loaded to the current ns */
 	if (!name) {
@@ -405,31 +391,23 @@ static struct aa_namespace *aa_prepare_namespace(const char *name)
 	/* released by caller */
 	ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
 	if (!ns) {
-		/* namespace not found */
-		struct aa_namespace *new_ns;
-		write_unlock(&root->lock);
-		new_ns = alloc_namespace(root->base.hname, name);
-		if (!new_ns)
-			return NULL;
-		write_lock(&root->lock);
-		/* test for race when new_ns was allocated */
-		ns = __aa_find_namespace(&root->sub_ns, name);
-		if (!ns) {
-			/* add parent ref */
-			new_ns->parent = aa_get_namespace(root);
-
-			list_add(&new_ns->base.list, &root->sub_ns);
-			/* add list ref */
-			ns = aa_get_namespace(new_ns);
-		} else {
-			/* raced so free the new one */
-			free_namespace(new_ns);
-			/* get reference on namespace */
-			aa_get_namespace(ns);
+		ns = alloc_namespace(root->base.hname, name);
+		if (!ns)
+			goto out;
+		if (__aa_fs_namespace_mkdir(ns, ns_subns_dir(root), name)) {
+			AA_ERROR("Failed to create interface for ns %s\n",
+				 ns->base.name);
+			free_namespace(ns);
+			ns = NULL;
+			goto out;
 		}
+		ns->parent = aa_get_namespace(root);
+		list_add_rcu(&ns->base.list, &root->sub_ns);
+		/* add list ref */
+		aa_get_namespace(ns);
 	}
 out:
-	write_unlock(&root->lock);
+	mutex_unlock(&root->lock);
 
 	/* return ref */
 	return ns;
@@ -447,7 +425,7 @@ out:
 static void __list_add_profile(struct list_head *list,
 			       struct aa_profile *profile)
 {
-	list_add(&profile->base.list, list);
+	list_add_rcu(&profile->base.list, list);
 	/* get list reference */
 	aa_get_profile(profile);
 }
@@ -466,49 +444,8 @@ static void __list_add_profile(struct list_head *list,
  */
 static void __list_remove_profile(struct aa_profile *profile)
 {
-	list_del_init(&profile->base.list);
-	if (!(profile->flags & PFLAG_NO_LIST_REF))
-		/* release list reference */
-		aa_put_profile(profile);
-}
-
-/**
- * __replace_profile - replace @old with @new on a list
- * @old: profile to be replaced  (NOT NULL)
- * @new: profile to replace @old with  (NOT NULL)
- *
- * Will duplicate and refcount elements that @new inherits from @old
- * and will inherit @old children.
- *
- * refcount @new for list, put @old list refcount
- *
- * Requires: namespace list lock be held, or list not be shared
- */
-static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
-{
-	struct aa_policy *policy;
-	struct aa_profile *child, *tmp;
-
-	if (old->parent)
-		policy = &old->parent->base;
-	else
-		policy = &old->ns->base;
-
-	/* released when @new is freed */
-	new->parent = aa_get_profile(old->parent);
-	new->ns = aa_get_namespace(old->ns);
-	__list_add_profile(&policy->profiles, new);
-	/* inherit children */
-	list_for_each_entry_safe(child, tmp, &old->base.profiles, base.list) {
-		aa_put_profile(child->parent);
-		child->parent = aa_get_profile(new);
-		/* list refcount transferred to @new*/
-		list_move(&child->base.list, &new->base.profiles);
-	}
-
-	/* released by free_profile */
-	old->replacedby = aa_get_profile(new);
-	__list_remove_profile(old);
+	list_del_rcu(&profile->base.list);
+	aa_put_profile(profile);
 }
 
 static void __profile_list_release(struct list_head *head);
@@ -524,7 +461,8 @@ static void __remove_profile(struct aa_profile *profile)
 	/* release any children lists first */
 	__profile_list_release(&profile->base.profiles);
 	/* released by free_profile */
-	profile->replacedby = aa_get_profile(profile->ns->unconfined);
+	__aa_update_replacedby(profile, profile->ns->unconfined);
+	__aa_fs_profile_rmdir(profile);
 	__list_remove_profile(profile);
 }
 
@@ -552,14 +490,17 @@ static void destroy_namespace(struct aa_namespace *ns)
 	if (!ns)
 		return;
 
-	write_lock(&ns->lock);
+	mutex_lock(&ns->lock);
 	/* release all profiles in this namespace */
 	__profile_list_release(&ns->base.profiles);
 
 	/* release all sub namespaces */
 	__ns_list_release(&ns->sub_ns);
 
-	write_unlock(&ns->lock);
+	if (ns->parent)
+		__aa_update_replacedby(ns->unconfined, ns->parent->unconfined);
+	__aa_fs_namespace_rmdir(ns);
+	mutex_unlock(&ns->lock);
 }
 
 /**
@@ -570,25 +511,9 @@ static void destroy_namespace(struct aa_namespace *ns)
  */
 static void __remove_namespace(struct aa_namespace *ns)
 {
-	struct aa_profile *unconfined = ns->unconfined;
-
 	/* remove ns from namespace list */
-	list_del_init(&ns->base.list);
-
-	/*
-	 * break the ns, unconfined profile cyclic reference and forward
-	 * all new unconfined profiles requests to the parent namespace
-	 * This will result in all confined tasks that have a profile
-	 * being removed, inheriting the parent->unconfined profile.
-	 */
-	if (ns->parent)
-		ns->unconfined = aa_get_profile(ns->parent->unconfined);
-
+	list_del_rcu(&ns->base.list);
 	destroy_namespace(ns);
-
-	/* release original ns->unconfined ref */
-	aa_put_profile(unconfined);
-	/* release ns->base.list ref, from removal above */
 	aa_put_namespace(ns);
 }
 
@@ -634,8 +559,25 @@ void __init aa_free_root_ns(void)
 	 aa_put_namespace(ns);
 }
 
+
+static void free_replacedby(struct aa_replacedby *r)
+{
+	if (r) {
+		aa_put_profile(rcu_dereference(r->profile));
+		kzfree(r);
+	}
+}
+
+
+void aa_free_replacedby_kref(struct kref *kref)
+{
+	struct aa_replacedby *r = container_of(kref, struct aa_replacedby,
+					       count);
+	free_replacedby(r);
+}
+
 /**
- * free_profile - free a profile
+ * aa_free_profile - free a profile
  * @profile: the profile to free  (MAYBE NULL)
  *
  * Free a profile, its hats and null_profile. All references to the profile,
@@ -644,25 +586,16 @@ void __init aa_free_root_ns(void)
  * If the profile was referenced from a task context, free_profile() will
  * be called from an rcu callback routine, so we must not sleep here.
  */
-static void free_profile(struct aa_profile *profile)
+void aa_free_profile(struct aa_profile *profile)
 {
-	struct aa_profile *p;
-
 	AA_DEBUG("%s(%p)\n", __func__, profile);
 
 	if (!profile)
 		return;
 
-	if (!list_empty(&profile->base.list)) {
-		AA_ERROR("%s: internal error, "
-			 "profile '%s' still on ns list\n",
-			 __func__, profile->base.name);
-		BUG();
-	}
-
 	/* free children profiles */
 	policy_destroy(&profile->base);
-	aa_put_profile(profile->parent);
+	aa_put_profile(rcu_access_pointer(profile->parent));
 
 	aa_put_namespace(profile->ns);
 	kzfree(profile->rename);
@@ -671,44 +604,35 @@ static void free_profile(struct aa_profile *profile)
 	aa_free_cap_rules(&profile->caps);
 	aa_free_rlimit_rules(&profile->rlimits);
 
+	kzfree(profile->dirname);
 	aa_put_dfa(profile->xmatch);
 	aa_put_dfa(profile->policy.dfa);
-
-	/* put the profile reference for replacedby, but not via
-	 * put_profile(kref_put).
-	 * replacedby can form a long chain that can result in cascading
-	 * frees that blows the stack because kref_put makes a nested fn
-	 * call (it looks like recursion, with free_profile calling
-	 * free_profile) for each profile in the chain lp#1056078.
-	 */
-	for (p = profile->replacedby; p; ) {
-		if (atomic_dec_and_test(&p->base.count.refcount)) {
-			/* no more refs on p, grab its replacedby */
-			struct aa_profile *next = p->replacedby;
-			/* break the chain */
-			p->replacedby = NULL;
-			/* now free p, chain is broken */
-			free_profile(p);
-
-			/* follow up with next profile in the chain */
-			p = next;
-		} else
-			break;
-	}
+	aa_put_replacedby(profile->replacedby);
 
 	kzfree(profile);
 }
 
+/**
+ * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
+ * @head: rcu_head callback for freeing of a profile  (NOT NULL)
+ */
+static void aa_free_profile_rcu(struct rcu_head *head)
+{
+	struct aa_profile *p = container_of(head, struct aa_profile, rcu);
+	if (p->flags & PFLAG_NS_COUNT)
+		free_namespace(p->ns);
+	else
+		aa_free_profile(p);
+}
+
 /**
  * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
  * @kr: kref callback for freeing of a profile  (NOT NULL)
  */
 void aa_free_profile_kref(struct kref *kref)
 {
-	struct aa_profile *p = container_of(kref, struct aa_profile,
-					    base.count);
-
-	free_profile(p);
+	struct aa_profile *p = container_of(kref, struct aa_profile, count);
+	call_rcu(&p->rcu, aa_free_profile_rcu);
 }
 
 /**
@@ -726,13 +650,23 @@ struct aa_profile *aa_alloc_profile(const char *hname)
 	if (!profile)
 		return NULL;
 
-	if (!policy_init(&profile->base, NULL, hname)) {
-		kzfree(profile);
-		return NULL;
-	}
+	profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL);
+	if (!profile->replacedby)
+		goto fail;
+	kref_init(&profile->replacedby->count);
+
+	if (!policy_init(&profile->base, NULL, hname))
+		goto fail;
+	kref_init(&profile->count);
 
 	/* refcount released by caller */
 	return profile;
+
+fail:
+	kzfree(profile->replacedby);
+	kzfree(profile);
+
+	return NULL;
 }
 
 /**
@@ -772,12 +706,12 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
 		profile->flags |= PFLAG_HAT;
 
 	/* released on free_profile */
-	profile->parent = aa_get_profile(parent);
+	rcu_assign_pointer(profile->parent, aa_get_profile(parent));
 	profile->ns = aa_get_namespace(parent->ns);
 
-	write_lock(&profile->ns->lock);
+	mutex_lock(&profile->ns->lock);
 	__list_add_profile(&parent->base.profiles, profile);
-	write_unlock(&profile->ns->lock);
+	mutex_unlock(&profile->ns->lock);
 
 	/* refcount released by caller */
 	return profile;
@@ -793,7 +727,7 @@ fail:
  * @head: list to search  (NOT NULL)
  * @name: name of profile (NOT NULL)
  *
- * Requires: ns lock protecting list be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted profile ptr, or NULL if not found
  */
@@ -808,7 +742,7 @@ static struct aa_profile *__find_child(struct list_head *head, const char *name)
  * @name: name of profile (NOT NULL)
  * @len: length of @name substring to match
  *
- * Requires: ns lock protecting list be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted profile ptr, or NULL if not found
  */
@@ -829,9 +763,9 @@ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
 {
 	struct aa_profile *profile;
 
-	read_lock(&parent->ns->lock);
+	rcu_read_lock();
 	profile = aa_get_profile(__find_child(&parent->base.profiles, name));
-	read_unlock(&parent->ns->lock);
+	rcu_read_unlock();
 
 	/* refcount released by caller */
 	return profile;
@@ -846,7 +780,7 @@ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
  * that matches hname does not need to exist, in general this
  * is used to load a new profile.
  *
- * Requires: ns->lock be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted policy or NULL if not found
  */
@@ -878,7 +812,7 @@ static struct aa_policy *__lookup_parent(struct aa_namespace *ns,
  * @base: base list to start looking up profile name from  (NOT NULL)
  * @hname: hierarchical profile name  (NOT NULL)
  *
- * Requires: ns->lock be held
+ * Requires: rcu_read_lock be held
  *
  * Returns: unrefcounted profile pointer or NULL if not found
  *
@@ -917,13 +851,15 @@ struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
 {
 	struct aa_profile *profile;
 
-	read_lock(&ns->lock);
-	profile = aa_get_profile(__lookup_profile(&ns->base, hname));
-	read_unlock(&ns->lock);
+	rcu_read_lock();
+	do {
+		profile = __lookup_profile(&ns->base, hname);
+	} while (profile && !aa_get_profile_not0(profile));
+	rcu_read_unlock();
 
 	/* the unconfined profile is not in the regular profile list */
 	if (!profile && strcmp(hname, "unconfined") == 0)
-		profile = aa_get_profile(ns->unconfined);
+		profile = aa_get_newest_profile(ns->unconfined);
 
 	/* refcount released by caller */
 	return profile;
@@ -952,25 +888,6 @@ static int replacement_allowed(struct aa_profile *profile, int noreplace,
 	return 0;
 }
 
-/**
- * __add_new_profile - simple wrapper around __list_add_profile
- * @ns: namespace that profile is being added to  (NOT NULL)
- * @policy: the policy container to add the profile to  (NOT NULL)
- * @profile: profile to add  (NOT NULL)
- *
- * add a profile to a list and do other required basic allocations
- */
-static void __add_new_profile(struct aa_namespace *ns, struct aa_policy *policy,
-			      struct aa_profile *profile)
-{
-	if (policy != &ns->base)
-		/* released on profile replacement or free_profile */
-		profile->parent = aa_get_profile((struct aa_profile *) policy);
-	__list_add_profile(&policy->profiles, profile);
-	/* released on free_profile */
-	profile->ns = aa_get_namespace(ns);
-}
-
 /**
  * aa_audit_policy - Do auditing of policy changes
  * @op: policy operation being performed
@@ -1019,6 +936,121 @@ bool aa_may_manage_policy(int op)
 	return 1;
 }
 
+static struct aa_profile *__list_lookup_parent(struct list_head *lh,
+					       struct aa_profile *profile)
+{
+	const char *base = hname_tail(profile->base.hname);
+	long len = base - profile->base.hname;
+	struct aa_load_ent *ent;
+
+	/* parent won't have trailing // so remove from len */
+	if (len <= 2)
+		return NULL;
+	len -= 2;
+
+	list_for_each_entry(ent, lh, list) {
+		if (ent->new == profile)
+			continue;
+		if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
+		    0 && ent->new->base.hname[len] == 0)
+			return ent->new;
+	}
+
+	return NULL;
+}
+
+/**
+ * __replace_profile - replace @old with @new on a list
+ * @old: profile to be replaced  (NOT NULL)
+ * @new: profile to replace @old with  (NOT NULL)
+ * @share_replacedby: transfer @old->replacedby to @new
+ *
+ * Will duplicate and refcount elements that @new inherits from @old
+ * and will inherit @old children.
+ *
+ * refcount @new for list, put @old list refcount
+ *
+ * Requires: namespace list lock be held, or list not be shared
+ */
+static void __replace_profile(struct aa_profile *old, struct aa_profile *new,
+			      bool share_replacedby)
+{
+	struct aa_profile *child, *tmp;
+
+	if (!list_empty(&old->base.profiles)) {
+		LIST_HEAD(lh);
+		list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
+
+		list_for_each_entry_safe(child, tmp, &lh, base.list) {
+			struct aa_profile *p;
+
+			list_del_init(&child->base.list);
+			p = __find_child(&new->base.profiles, child->base.name);
+			if (p) {
+				/* @p replaces @child  */
+				__replace_profile(child, p, share_replacedby);
+				continue;
+			}
+
+			/* inherit @child and its children */
+			/* TODO: update hname of inherited children */
+			/* list refcount transferred to @new */
+			p = aa_deref_parent(child);
+			rcu_assign_pointer(child->parent, aa_get_profile(new));
+			list_add_rcu(&child->base.list, &new->base.profiles);
+			aa_put_profile(p);
+		}
+	}
+
+	if (!rcu_access_pointer(new->parent)) {
+		struct aa_profile *parent = aa_deref_parent(old);
+		rcu_assign_pointer(new->parent, aa_get_profile(parent));
+	}
+	__aa_update_replacedby(old, new);
+	if (share_replacedby) {
+		aa_put_replacedby(new->replacedby);
+		new->replacedby = aa_get_replacedby(old->replacedby);
+	} else if (!rcu_access_pointer(new->replacedby->profile))
+		/* aafs interface uses replacedby */
+		rcu_assign_pointer(new->replacedby->profile,
+				   aa_get_profile(new));
+	__aa_fs_profile_migrate_dents(old, new);
+
+	if (list_empty(&new->base.list)) {
+		/* new is not on a list already */
+		list_replace_rcu(&old->base.list, &new->base.list);
+		aa_get_profile(new);
+		aa_put_profile(old);
+	} else
+		__list_remove_profile(old);
+}
+
+/**
+ * __lookup_replace - lookup replacement information for a profile
+ * @ns - namespace the lookup occurs in
+ * @hname - name of profile to lookup
+ * @noreplace - true if not replacing an existing profile
+ * @p - Returns: profile to be replaced
+ * @info - Returns: info string on why lookup failed
+ *
+ * Returns: profile to replace (no ref) on success else ptr error
+ */
+static int __lookup_replace(struct aa_namespace *ns, const char *hname,
+			    bool noreplace, struct aa_profile **p,
+			    const char **info)
+{
+	*p = aa_get_profile(__lookup_profile(&ns->base, hname));
+	if (*p) {
+		int error = replacement_allowed(*p, noreplace, info);
+		if (error) {
+			*info = "profile can not be replaced";
+			return error;
+		}
+	}
+
+	return 0;
+}
+
 /**
  * aa_replace_profiles - replace profile(s) on the profile list
  * @udata: serialized data stream  (NOT NULL)
@@ -1033,21 +1065,17 @@ bool aa_may_manage_policy(int op)
  */
 ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
 {
-	struct aa_policy *policy;
-	struct aa_profile *old_profile = NULL, *new_profile = NULL;
-	struct aa_profile *rename_profile = NULL;
-	struct aa_namespace *ns = NULL;
 	const char *ns_name, *name = NULL, *info = NULL;
+	struct aa_namespace *ns = NULL;
+	struct aa_load_ent *ent, *tmp;
 	int op = OP_PROF_REPL;
 	ssize_t error;
+	LIST_HEAD(lh);
 
 	/* released below */
-	new_profile = aa_unpack(udata, size, &ns_name);
-	if (IS_ERR(new_profile)) {
-		error = PTR_ERR(new_profile);
-		new_profile = NULL;
-		goto fail;
-	}
+	error = aa_unpack(udata, size, &lh, &ns_name);
+	if (error)
+		goto out;
 
 	/* released below */
 	ns = aa_prepare_namespace(ns_name);
@@ -1058,71 +1086,140 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
 		goto fail;
 	}
 
-	name = new_profile->base.hname;
-
-	write_lock(&ns->lock);
-	/* no ref on policy only use inside lock */
-	policy = __lookup_parent(ns, new_profile->base.hname);
+	mutex_lock(&ns->lock);
+	/* setup parent and ns info */
+	list_for_each_entry(ent, &lh, list) {
+		struct aa_policy *policy;
+
+		name = ent->new->base.hname;
+		error = __lookup_replace(ns, ent->new->base.hname, noreplace,
+					 &ent->old, &info);
+		if (error)
+			goto fail_lock;
+
+		if (ent->new->rename) {
+			error = __lookup_replace(ns, ent->new->rename,
+						 noreplace, &ent->rename,
+						 &info);
+			if (error)
+				goto fail_lock;
+		}
 
-	if (!policy) {
-		info = "parent does not exist";
-		error = -ENOENT;
-		goto audit;
+		/* released when @new is freed */
+		ent->new->ns = aa_get_namespace(ns);
+
+		if (ent->old || ent->rename)
+			continue;
+
+		/* no ref on policy only use inside lock */
+		policy = __lookup_parent(ns, ent->new->base.hname);
+		if (!policy) {
+			struct aa_profile *p;
+			p = __list_lookup_parent(&lh, ent->new);
+			if (!p) {
+				error = -ENOENT;
+				info = "parent does not exist";
+				name = ent->new->base.hname;
+				goto fail_lock;
+			}
+			rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
+		} else if (policy != &ns->base) {
+			/* released on profile replacement or free_profile */
+			struct aa_profile *p = (struct aa_profile *) policy;
+			rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
+		}
 	}
 
-	old_profile = __find_child(&policy->profiles, new_profile->base.name);
-	/* released below */
-	aa_get_profile(old_profile);
+	/* create new fs entries for introspection if needed */
+	list_for_each_entry(ent, &lh, list) {
+		if (ent->old) {
+			/* inherit old interface files */
 
-	if (new_profile->rename) {
-		rename_profile = __lookup_profile(&ns->base,
-						  new_profile->rename);
-		/* released below */
-		aa_get_profile(rename_profile);
+			/* if (ent->rename)
+				TODO: support rename */
+		/* } else if (ent->rename) {
+			TODO: support rename */
+		} else {
+			struct dentry *parent;
+			if (rcu_access_pointer(ent->new->parent)) {
+				struct aa_profile *p;
+				p = aa_deref_parent(ent->new);
+				parent = prof_child_dir(p);
+			} else
+				parent = ns_subprofs_dir(ent->new->ns);
+			error = __aa_fs_profile_mkdir(ent->new, parent);
+		}
 
-		if (!rename_profile) {
-			info = "profile to rename does not exist";
-			name = new_profile->rename;
-			error = -ENOENT;
-			goto audit;
+		if (error) {
+			info = "failed to create ";
+			goto fail_lock;
 		}
 	}
 
-	error = replacement_allowed(old_profile, noreplace, &info);
-	if (error)
-		goto audit;
-
-	error = replacement_allowed(rename_profile, noreplace, &info);
-	if (error)
-		goto audit;
-
-audit:
-	if (!old_profile && !rename_profile)
-		op = OP_PROF_LOAD;
-
-	error = audit_policy(op, GFP_ATOMIC, name, info, error);
-
-	if (!error) {
-		if (rename_profile)
-			__replace_profile(rename_profile, new_profile);
-		if (old_profile)
-			__replace_profile(old_profile, new_profile);
-		if (!(old_profile || rename_profile))
-			__add_new_profile(ns, policy, new_profile);
+	/* Done with checks that may fail - do actual replacement */
+	list_for_each_entry_safe(ent, tmp, &lh, list) {
+		list_del_init(&ent->list);
+		op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
+
+		audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error);
+
+		if (ent->old) {
+			__replace_profile(ent->old, ent->new, 1);
+			if (ent->rename) {
+				/* aafs interface uses replacedby */
+				struct aa_replacedby *r = ent->new->replacedby;
+				rcu_assign_pointer(r->profile,
+						   aa_get_profile(ent->new));
+				__replace_profile(ent->rename, ent->new, 0);
+			}
+		} else if (ent->rename) {
+			/* aafs interface uses replacedby */
+			rcu_assign_pointer(ent->new->replacedby->profile,
+					   aa_get_profile(ent->new));
+			__replace_profile(ent->rename, ent->new, 0);
+		} else if (ent->new->parent) {
+			struct aa_profile *parent, *newest;
+			parent = aa_deref_parent(ent->new);
+			newest = aa_get_newest_profile(parent);
+
+			/* parent replaced in this atomic set? */
+			if (newest != parent) {
+				aa_get_profile(newest);
+				aa_put_profile(parent);
+				rcu_assign_pointer(ent->new->parent, newest);
+			} else
+				aa_put_profile(newest);
+			/* aafs interface uses replacedby */
+			rcu_assign_pointer(ent->new->replacedby->profile,
+					   aa_get_profile(ent->new));
+			__list_add_profile(&parent->base.profiles, ent->new);
+		} else {
+			/* aafs interface uses replacedby */
+			rcu_assign_pointer(ent->new->replacedby->profile,
+					   aa_get_profile(ent->new));
+			__list_add_profile(&ns->base.profiles, ent->new);
+		}
+		aa_load_ent_free(ent);
 	}
-	write_unlock(&ns->lock);
+	mutex_unlock(&ns->lock);
 
 out:
 	aa_put_namespace(ns);
-	aa_put_profile(rename_profile);
-	aa_put_profile(old_profile);
-	aa_put_profile(new_profile);
+
 	if (error)
 		return error;
 	return size;
 
+fail_lock:
+	mutex_unlock(&ns->lock);
 fail:
 	error = audit_policy(op, GFP_KERNEL, name, info, error);
+
+	list_for_each_entry_safe(ent, tmp, &lh, list) {
+		list_del_init(&ent->list);
+		aa_load_ent_free(ent);
+	}
+
 	goto out;
 }
 
@@ -1169,12 +1266,12 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
 
 	if (!name) {
 		/* remove namespace - can only happen if fqname[0] == ':' */
-		write_lock(&ns->parent->lock);
+		mutex_lock(&ns->parent->lock);
 		__remove_namespace(ns);
-		write_unlock(&ns->parent->lock);
+		mutex_unlock(&ns->parent->lock);
 	} else {
 		/* remove profile */
-		write_lock(&ns->lock);
+		mutex_lock(&ns->lock);
 		profile = aa_get_profile(__lookup_profile(&ns->base, name));
 		if (!profile) {
 			error = -ENOENT;
@@ -1183,7 +1280,7 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
 		}
 		name = profile->base.hname;
 		__remove_profile(profile);
-		write_unlock(&ns->lock);
+		mutex_unlock(&ns->lock);
 	}
 
 	/* don't fail removal if audit fails */
@@ -1193,7 +1290,7 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
 	return size;
 
 fail_ns_lock:
-	write_unlock(&ns->lock);
+	mutex_unlock(&ns->lock);
 	aa_put_namespace(ns);
 
 fail:

security/apparmor/policy_unpack.c

@@ -24,6 +24,7 @@
 #include "include/apparmor.h"
 #include "include/audit.h"
 #include "include/context.h"
+#include "include/crypto.h"
 #include "include/match.h"
 #include "include/policy.h"
 #include "include/policy_unpack.h"
@@ -333,8 +334,10 @@ static struct aa_dfa *unpack_dfa(struct aa_ext *e)
 		/*
 		 * The dfa is aligned with in the blob to 8 bytes
 		 * from the beginning of the stream.
+		 * alignment adjust needed by dfa unpack
 		 */
-		size_t sz = blob - (char *)e->start;
+		size_t sz = blob - (char *) e->start -
+			((e->pos - e->start) & 7);
 		size_t pad = ALIGN(sz, 8) - sz;
 		int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
 			TO_ACCEPT2_FLAG(YYTD_DATA32);
@@ -490,6 +493,9 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
 	/* profile renaming is optional */
 	(void) unpack_str(e, &profile->rename, "rename");
 
+	/* attachment string is optional */
+	(void) unpack_str(e, &profile->attach, "attach");
+
 	/* xmatch is optional and may be NULL */
 	profile->xmatch = unpack_dfa(e);
 	if (IS_ERR(profile->xmatch)) {
@@ -509,12 +515,16 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
 		goto fail;
 	if (!unpack_u32(e, &tmp, NULL))
 		goto fail;
-	if (tmp)
+	if (tmp & PACKED_FLAG_HAT)
 		profile->flags |= PFLAG_HAT;
 	if (!unpack_u32(e, &tmp, NULL))
 		goto fail;
-	if (tmp)
+	if (tmp == PACKED_MODE_COMPLAIN)
 		profile->mode = APPARMOR_COMPLAIN;
+	else if (tmp == PACKED_MODE_KILL)
+		profile->mode = APPARMOR_KILL;
+	else if (tmp == PACKED_MODE_UNCONFINED)
+		profile->mode = APPARMOR_UNCONFINED;
 	if (!unpack_u32(e, &tmp, NULL))
 		goto fail;
 	if (tmp)
@@ -614,7 +624,7 @@ fail:
 	else if (!name)
 		name = "unknown";
 	audit_iface(profile, name, "failed to unpack profile", e, error);
-	aa_put_profile(profile);
+	aa_free_profile(profile);
 
 	return ERR_PTR(error);
 }
@@ -622,29 +632,41 @@ fail:
 /**
  * verify_head - unpack serialized stream header
  * @e: serialized data read head (NOT NULL)
+ * @required: whether the header is required or optional
  * @ns: Returns - namespace if one is specified else NULL (NOT NULL)
  *
  * Returns: error or 0 if header is good
  */
-static int verify_header(struct aa_ext *e, const char **ns)
+static int verify_header(struct aa_ext *e, int required, const char **ns)
 {
 	int error = -EPROTONOSUPPORT;
+	const char *name = NULL;
+	*ns = NULL;
+
 	/* get the interface version */
 	if (!unpack_u32(e, &e->version, "version")) {
-		audit_iface(NULL, NULL, "invalid profile format", e, error);
-		return error;
-	}
+		if (required) {
+			audit_iface(NULL, NULL, "invalid profile format", e,
+				    error);
+			return error;
+		}
 
-	/* check that the interface version is currently supported */
-	if (e->version != 5) {
-		audit_iface(NULL, NULL, "unsupported interface version", e,
-			    error);
-		return error;
+		/* check that the interface version is currently supported */
+		if (e->version != 5) {
+			audit_iface(NULL, NULL, "unsupported interface version",
+				    e, error);
+			return error;
+		}
 	}
 
+
 	/* read the namespace if present */
-	if (!unpack_str(e, ns, "namespace"))
-		*ns = NULL;
+	if (unpack_str(e, &name, "namespace")) {
+		if (*ns && strcmp(*ns, name))
+			audit_iface(NULL, NULL, "invalid ns change", e, error);
+		else if (!*ns)
+			*ns = name;
+	}
 
 	return 0;
 }
@@ -693,18 +715,40 @@ static int verify_profile(struct aa_profile *profile)
 	return 0;
 }
 
+void aa_load_ent_free(struct aa_load_ent *ent)
+{
+	if (ent) {
+		aa_put_profile(ent->rename);
+		aa_put_profile(ent->old);
+		aa_put_profile(ent->new);
+		kzfree(ent);
+	}
+}
+
+struct aa_load_ent *aa_load_ent_alloc(void)
+{
+	struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+	if (ent)
+		INIT_LIST_HEAD(&ent->list);
+	return ent;
+}
+
 /**
- * aa_unpack - unpack packed binary profile data loaded from user space
+ * aa_unpack - unpack packed binary profile(s) data loaded from user space
  * @udata: user data copied to kmem  (NOT NULL)
  * @size: the size of the user data
+ * @lh: list to place unpacked profiles in a aa_repl_ws
  * @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
  *
- * Unpack user data and return refcounted allocated profile or ERR_PTR
+ * Unpack user data and return refcounted allocated profile(s) stored in
+ * @lh in order of discovery, with the list chain stored in base.list
+ * or error
  *
- * Returns: profile else error pointer if fails to unpack
+ * Returns: profile(s) on @lh else error pointer if fails to unpack
  */
-struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
+int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
 {
+	struct aa_load_ent *tmp, *ent;
 	struct aa_profile *profile = NULL;
 	int error;
 	struct aa_ext e = {
@@ -713,20 +757,49 @@ struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
 		.pos = udata,
 	};
 
-	error = verify_header(&e, ns);
-	if (error)
-		return ERR_PTR(error);
+	*ns = NULL;
+	while (e.pos < e.end) {
+		void *start;
+		error = verify_header(&e, e.pos == e.start, ns);
+		if (error)
+			goto fail;
+
+		start = e.pos;
+		profile = unpack_profile(&e);
+		if (IS_ERR(profile)) {
+			error = PTR_ERR(profile);
+			goto fail;
+		}
+
+		error = verify_profile(profile);
+		if (error)
+			goto fail_profile;
+
+		error = aa_calc_profile_hash(profile, e.version, start,
+					     e.pos - start);
+		if (error)
+			goto fail_profile;
+
+		ent = aa_load_ent_alloc();
+		if (!ent) {
+			error = -ENOMEM;
+			goto fail_profile;
+		}
+
+		ent->new = profile;
+		list_add_tail(&ent->list, lh);
+	}
+
+	return 0;
 
-	profile = unpack_profile(&e);
-	if (IS_ERR(profile))
-		return profile;
+fail_profile:
+	aa_put_profile(profile);
 
-	error = verify_profile(profile);
-	if (error) {
-		aa_put_profile(profile);
-		profile = ERR_PTR(error);
+fail:
+	list_for_each_entry_safe(ent, tmp, lh, list) {
+		list_del_init(&ent->list);
+		aa_load_ent_free(ent);
 	}
 
-	/* return refcount */
-	return profile;
+	return error;
 }

security/apparmor/procattr.c

@@ -37,7 +37,7 @@ int aa_getprocattr(struct aa_profile *profile, char **string)
 {
 	char *str;
 	int len = 0, mode_len = 0, ns_len = 0, name_len;
-	const char *mode_str = profile_mode_names[profile->mode];
+	const char *mode_str = aa_profile_mode_names[profile->mode];
 	const char *ns_name = NULL;
 	struct aa_namespace *ns = profile->ns;
 	struct aa_namespace *current_ns = __aa_current_profile()->ns;

security/capability.c

@@ -129,7 +129,7 @@ static void cap_inode_free_security(struct inode *inode)
 }
 
 static int cap_inode_init_security(struct inode *inode, struct inode *dir,
-				   const struct qstr *qstr, char **name,
+				   const struct qstr *qstr, const char **name,
 				   void **value, size_t *len)
 {
 	return -EOPNOTSUPP;

security/integrity/evm/evm_main.c

@@ -418,7 +418,7 @@ int evm_inode_init_security(struct inode *inode,
 
 	evm_xattr->value = xattr_data;
 	evm_xattr->value_len = sizeof(*xattr_data);
-	evm_xattr->name = kstrdup(XATTR_EVM_SUFFIX, GFP_NOFS);
+	evm_xattr->name = XATTR_EVM_SUFFIX;
 	return 0;
 out:
 	kfree(xattr_data);

security/security.c

@@ -348,10 +348,10 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
 	if (unlikely(IS_PRIVATE(inode)))
 		return 0;
 
-	memset(new_xattrs, 0, sizeof new_xattrs);
 	if (!initxattrs)
 		return security_ops->inode_init_security(inode, dir, qstr,
 							 NULL, NULL, NULL);
+	memset(new_xattrs, 0, sizeof(new_xattrs));
 	lsm_xattr = new_xattrs;
 	ret = security_ops->inode_init_security(inode, dir, qstr,
 						&lsm_xattr->name,
@@ -366,16 +366,14 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
 		goto out;
 	ret = initxattrs(inode, new_xattrs, fs_data);
 out:
-	for (xattr = new_xattrs; xattr->name != NULL; xattr++) {
-		kfree(xattr->name);
+	for (xattr = new_xattrs; xattr->value != NULL; xattr++)
 		kfree(xattr->value);
-	}
 	return (ret == -EOPNOTSUPP) ? 0 : ret;
 }
 EXPORT_SYMBOL(security_inode_init_security);
 
 int security_old_inode_init_security(struct inode *inode, struct inode *dir,
-				     const struct qstr *qstr, char **name,
+				     const struct qstr *qstr, const char **name,
 				     void **value, size_t *len)
 {
 	if (unlikely(IS_PRIVATE(inode)))

security/selinux/hooks.c

@@ -2587,7 +2587,8 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
 }
 
 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
-				       const struct qstr *qstr, char **name,
+				       const struct qstr *qstr,
+				       const char **name,
 				       void **value, size_t *len)
 {
 	const struct task_security_struct *tsec = current_security();
@@ -2595,7 +2596,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 	struct superblock_security_struct *sbsec;
 	u32 sid, newsid, clen;
 	int rc;
-	char *namep = NULL, *context;
+	char *context;
 
 	dsec = dir->i_security;
 	sbsec = dir->i_sb->s_security;
@@ -2631,19 +2632,13 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
 	if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP))
 		return -EOPNOTSUPP;
 
-	if (name) {
-		namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS);
-		if (!namep)
-			return -ENOMEM;
-		*name = namep;
-	}
+	if (name)
+		*name = XATTR_SELINUX_SUFFIX;
 
 	if (value && len) {
 		rc = security_sid_to_context_force(newsid, &context, &clen);
-		if (rc) {
-			kfree(namep);
+		if (rc)
 			return rc;
-		}
 		*value = context;
 		*len = clen;
 	}

security/smack/smack.h

@@ -53,6 +53,7 @@
  */
 struct smack_known {
 	struct list_head		list;
+	struct hlist_node		smk_hashed;
 	char				*smk_known;
 	u32				smk_secid;
 	struct netlbl_lsm_secattr	smk_netlabel;	/* on wire labels */
@@ -167,9 +168,13 @@ struct smk_port_label {
 #define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
 #define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
 #define SMACK_CIPSO_MAPPED_DEFAULT	251	/* Also arbitrary */
-#define SMACK_CIPSO_MAXCATVAL		63	/* Bigger gets harder */
 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
-#define SMACK_CIPSO_MAXCATNUM           239     /* CIPSO 2.2 standard */
+/*
+ * CIPSO 2.2 standard is 239, but Smack wants to use the
+ * categories in a structured way that limits the value to
+ * the bits in 23 bytes, hence the unusual number.
+ */
+#define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
 
 /*
  * Flag for transmute access
@@ -222,6 +227,7 @@ char *smk_parse_smack(const char *string, int len);
 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
 char *smk_import(const char *, int);
 struct smack_known *smk_import_entry(const char *, int);
+void smk_insert_entry(struct smack_known *skp);
 struct smack_known *smk_find_entry(const char *);
 u32 smack_to_secid(const char *);
 
@@ -247,6 +253,9 @@ extern struct list_head smk_netlbladdr_list;
 
 extern struct security_operations smack_ops;
 
+#define SMACK_HASH_SLOTS 16
+extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
+
 /*
  * Is the directory transmuting?
  */

security/smack/smack_access.c

@@ -325,6 +325,25 @@ void smack_log(char *subject_label, char *object_label, int request,
 
 DEFINE_MUTEX(smack_known_lock);
 
+struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
+
+/**
+ * smk_insert_entry - insert a smack label into a hash map,
+ *
+ * this function must be called under smack_known_lock
+ */
+void smk_insert_entry(struct smack_known *skp)
+{
+	unsigned int hash;
+	struct hlist_head *head;
+
+	hash = full_name_hash(skp->smk_known, strlen(skp->smk_known));
+	head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
+
+	hlist_add_head_rcu(&skp->smk_hashed, head);
+	list_add_rcu(&skp->list, &smack_known_list);
+}
+
 /**
  * smk_find_entry - find a label on the list, return the list entry
  * @string: a text string that might be a Smack label
@@ -334,12 +353,16 @@ DEFINE_MUTEX(smack_known_lock);
  */
 struct smack_known *smk_find_entry(const char *string)
 {
+	unsigned int hash;
+	struct hlist_head *head;
 	struct smack_known *skp;
 
-	list_for_each_entry_rcu(skp, &smack_known_list, list) {
+	hash = full_name_hash(string, strlen(string));
+	head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
+
+	hlist_for_each_entry_rcu(skp, head, smk_hashed)
 		if (strcmp(skp->smk_known, string) == 0)
 			return skp;
-	}
 
 	return NULL;
 }
@@ -475,7 +498,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
 		 * Make sure that the entry is actually
 		 * filled before putting it on the list.
 		 */
-		list_add_rcu(&skp->list, &smack_known_list);
+		smk_insert_entry(skp);
 		goto unlockout;
 	}
 	/*

security/smack/smack_lsm.c

@@ -582,7 +582,7 @@ static void smack_inode_free_security(struct inode *inode)
  * Returns 0 if it all works out, -ENOMEM if there's no memory
  */
 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
-				     const struct qstr *qstr, char **name,
+				     const struct qstr *qstr, const char **name,
 				     void **value, size_t *len)
 {
 	struct inode_smack *issp = inode->i_security;
@@ -591,11 +591,8 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
 	char *dsp = smk_of_inode(dir);
 	int may;
 
-	if (name) {
-		*name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
-		if (*name == NULL)
-			return -ENOMEM;
-	}
+	if (name)
+		*name = XATTR_SMACK_SUFFIX;
 
 	if (value) {
 		rcu_read_lock();
@@ -3065,6 +3062,8 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
 {
 	struct smack_known *skp;
 	int found = 0;
+	int acat;
+	int kcat;
 
 	if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
 		/*
@@ -3081,12 +3080,28 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
 		list_for_each_entry(skp, &smack_known_list, list) {
 			if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
 				continue;
-			if (memcmp(sap->attr.mls.cat,
-				skp->smk_netlabel.attr.mls.cat,
-				SMK_CIPSOLEN) != 0)
-				continue;
-			found = 1;
-			break;
+			/*
+			 * Compare the catsets. Use the netlbl APIs.
+			 */
+			if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
+				if ((skp->smk_netlabel.flags &
+				     NETLBL_SECATTR_MLS_CAT) == 0)
+					found = 1;
+				break;
+			}
+			for (acat = -1, kcat = -1; acat == kcat; ) {
+				acat = netlbl_secattr_catmap_walk(
+					sap->attr.mls.cat, acat + 1);
+				kcat = netlbl_secattr_catmap_walk(
+					skp->smk_netlabel.attr.mls.cat,
+					kcat + 1);
+				if (acat < 0 || kcat < 0)
+					break;
+			}
+			if (acat == kcat) {
+				found = 1;
+				break;
+			}
 		}
 		rcu_read_unlock();
 
@@ -3877,12 +3892,12 @@ static __init void init_smack_known_list(void)
 	/*
 	 * Create the known labels list
 	 */
-	list_add(&smack_known_huh.list, &smack_known_list);
-	list_add(&smack_known_hat.list, &smack_known_list);
-	list_add(&smack_known_star.list, &smack_known_list);
-	list_add(&smack_known_floor.list, &smack_known_list);
-	list_add(&smack_known_invalid.list, &smack_known_list);
-	list_add(&smack_known_web.list, &smack_known_list);
+	smk_insert_entry(&smack_known_huh);
+	smk_insert_entry(&smack_known_hat);
+	smk_insert_entry(&smack_known_star);
+	smk_insert_entry(&smack_known_floor);
+	smk_insert_entry(&smack_known_invalid);
+	smk_insert_entry(&smack_known_web);
 }
 
 /**

security/smack/smackfs.c

@@ -368,56 +368,43 @@ static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
  * @data: string to be parsed, null terminated
  * @rule: Will be filled with Smack parsed rule
  * @import: if non-zero, import labels
- * @change: if non-zero, data is from /smack/change-rule
+ * @tokens: numer of substrings expected in data
  *
- * Returns 0 on success, -1 on failure
+ * Returns number of processed bytes on success, -1 on failure.
  */
-static int smk_parse_long_rule(const char *data, struct smack_parsed_rule *rule,
-				int import, int change)
+static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
+				int import, int tokens)
 {
-	char *subject;
-	char *object;
-	char *access1;
-	char *access2;
-	int datalen;
-	int rc = -1;
+	ssize_t cnt = 0;
+	char *tok[4];
+	int i;
 
-	/* This is inefficient */
-	datalen = strlen(data);
+	/*
+	 * Parsing the rule in-place, filling all white-spaces with '\0'
+	 */
+	for (i = 0; i < tokens; ++i) {
+		while (isspace(data[cnt]))
+			data[cnt++] = '\0';
 
-	/* Our first element can be 64 + \0 with no spaces */
-	subject = kzalloc(datalen + 1, GFP_KERNEL);
-	if (subject == NULL)
-		return -1;
-	object = kzalloc(datalen, GFP_KERNEL);
-	if (object == NULL)
-		goto free_out_s;
-	access1 = kzalloc(datalen, GFP_KERNEL);
-	if (access1 == NULL)
-		goto free_out_o;
-	access2 = kzalloc(datalen, GFP_KERNEL);
-	if (access2 == NULL)
-		goto free_out_a;
-
-	if (change) {
-		if (sscanf(data, "%s %s %s %s",
-			subject, object, access1, access2) == 4)
-			rc = smk_fill_rule(subject, object, access1, access2,
-				rule, import, 0);
-	} else {
-		if (sscanf(data, "%s %s %s", subject, object, access1) == 3)
-			rc = smk_fill_rule(subject, object, access1, NULL,
-				rule, import, 0);
+		if (data[cnt] == '\0')
+			/* Unexpected end of data */
+			return -1;
+
+		tok[i] = data + cnt;
+
+		while (data[cnt] && !isspace(data[cnt]))
+			++cnt;
 	}
+	while (isspace(data[cnt]))
+		data[cnt++] = '\0';
 
-	kfree(access2);
-free_out_a:
-	kfree(access1);
-free_out_o:
-	kfree(object);
-free_out_s:
-	kfree(subject);
-	return rc;
+	while (i < 4)
+		tok[i++] = NULL;
+
+	if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
+		return -1;
+
+	return cnt;
 }
 
 #define SMK_FIXED24_FMT	0	/* Fixed 24byte label format */
@@ -447,11 +434,12 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 					struct list_head *rule_list,
 					struct mutex *rule_lock, int format)
 {
-	struct smack_parsed_rule *rule;
+	struct smack_parsed_rule rule;
 	char *data;
-	int datalen;
-	int rc = -EINVAL;
-	int load = 0;
+	int rc;
+	int trunc = 0;
+	int tokens;
+	ssize_t cnt = 0;
 
 	/*
 	 * No partial writes.
@@ -466,11 +454,14 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 		 */
 		if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
 			return -EINVAL;
-		datalen = SMK_LOADLEN;
-	} else
-		datalen = count + 1;
+	} else {
+		if (count >= PAGE_SIZE) {
+			count = PAGE_SIZE - 1;
+			trunc = 1;
+		}
+	}
 
-	data = kzalloc(datalen, GFP_KERNEL);
+	data = kmalloc(count + 1, GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 
@@ -479,47 +470,49 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 		goto out;
 	}
 
-	rule = kzalloc(sizeof(*rule), GFP_KERNEL);
-	if (rule == NULL) {
-		rc = -ENOMEM;
-		goto out;
+	/*
+	 * In case of parsing only part of user buf,
+	 * avoid having partial rule at the data buffer
+	 */
+	if (trunc) {
+		while (count > 0 && (data[count - 1] != '\n'))
+			--count;
+		if (count == 0) {
+			rc = -EINVAL;
+			goto out;
+		}
 	}
 
-	if (format == SMK_LONG_FMT) {
-		/*
-		 * Be sure the data string is terminated.
-		 */
-		data[count] = '\0';
-		if (smk_parse_long_rule(data, rule, 1, 0))
-			goto out_free_rule;
-	} else if (format == SMK_CHANGE_FMT) {
-		data[count] = '\0';
-		if (smk_parse_long_rule(data, rule, 1, 1))
-			goto out_free_rule;
-	} else {
-		/*
-		 * More on the minor hack for backward compatibility
-		 */
-		if (count == (SMK_OLOADLEN))
-			data[SMK_OLOADLEN] = '-';
-		if (smk_parse_rule(data, rule, 1))
-			goto out_free_rule;
-	}
+	data[count] = '\0';
+	tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
+	while (cnt < count) {
+		if (format == SMK_FIXED24_FMT) {
+			rc = smk_parse_rule(data, &rule, 1);
+			if (rc != 0) {
+				rc = -EINVAL;
+				goto out;
+			}
+			cnt = count;
+		} else {
+			rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
+			if (rc <= 0) {
+				rc = -EINVAL;
+				goto out;
+			}
+			cnt += rc;
+		}
 
-	if (rule_list == NULL) {
-		load = 1;
-		rule_list = &rule->smk_subject->smk_rules;
-		rule_lock = &rule->smk_subject->smk_rules_lock;
-	}
+		if (rule_list == NULL)
+			rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
+				&rule.smk_subject->smk_rules_lock, 1);
+		else
+			rc = smk_set_access(&rule, rule_list, rule_lock, 0);
 
-	rc = smk_set_access(rule, rule_list, rule_lock, load);
-	if (rc == 0) {
-		rc = count;
-		goto out;
+		if (rc)
+			goto out;
 	}
 
-out_free_rule:
-	kfree(rule);
+	rc = cnt;
 out:
 	kfree(data);
 	return rc;
@@ -901,7 +894,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 	for (i = 0; i < catlen; i++) {
 		rule += SMK_DIGITLEN;
 		ret = sscanf(rule, "%u", &cat);
-		if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
+		if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 			goto out;
 
 		smack_catset_bit(cat, mapcatset);
@@ -1840,7 +1833,6 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
 {
 	struct smack_parsed_rule rule;
 	char *data;
-	char *cod;
 	int res;
 
 	data = simple_transaction_get(file, buf, count);
@@ -1853,18 +1845,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
 		res = smk_parse_rule(data, &rule, 0);
 	} else {
 		/*
-		 * Copy the data to make sure the string is terminated.
+		 * simple_transaction_get() returns null-terminated data
 		 */
-		cod = kzalloc(count + 1, GFP_KERNEL);
-		if (cod == NULL)
-			return -ENOMEM;
-		memcpy(cod, data, count);
-		cod[count] = '\0';
-		res = smk_parse_long_rule(cod, &rule, 0, 0);
-		kfree(cod);
+		res = smk_parse_long_rule(data, &rule, 0, 3);
 	}
 
-	if (res)
+	if (res < 0)
 		return -EINVAL;
 
 	res = smk_access(rule.smk_subject, rule.smk_object,