[RFC][PATCH 6/11] security: AppArmor - Userspace interface

[Tony Jones]

This patch implements the interface between the userspace policy loader
and the kernel module.   It is called by the .load, .remove and .replace
file_operations hooks implemented in apparmorfs.c.

The code is reponsible for serializing data in a platform independant 
manner from userspace and creating/activating the necessary apparmor 
profiles.

Certain aspects are delegated to the sub matching module which implements
the aamatch_* functions.


Signed-off-by: Tony Jones <tonyj@xxxxxxx>

---
 security/apparmor/module_interface.c |  840 +++++++++++++++++++++++++++++++++++
 security/apparmor/module_interface.h |   37 +
 2 files changed, 877 insertions(+)

--- /dev/null
+++ linux-2.6.17-rc1/security/apparmor/module_interface.c
@@ -0,0 +1,840 @@
+/*
+ *	Copyright (C) 1998-2005 Novell/SUSE
+ *
+ *	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.
+ *
+ *	AppArmor userspace policy interface
+ */
+
+#include <asm/unaligned.h>
+
+#include "apparmor.h"
+#include "inline.h"
+#include "module_interface.h"
+#include "match/match.h"
+
+/* aa_code defined in module_interface.h */
+
+const int aacode_datasize[] = { 1, 2, 4, 8, 2, 2, 4, 0, 0, 0, 0, 0, 0 };
+
+struct aa_taskreplace_data {
+	struct aaprofile *old_profile;
+	struct aaprofile *new_profile;
+};
+
+/* inlines must be forward of there use in newer version of gcc,
+   just forward declaring with a prototype won't work anymore */
+
+static inline void free_aa_entry(struct aa_entry *entry)
+{
+	if (entry) {
+		kfree(entry->filename);
+		aamatch_free(entry->extradata);
+		kfree(entry);
+	}
+}
+
+/**
+ * alloc_aa_entry - create new empty aa_entry
+ * This routine allocates, initializes, and returns a new aa_entry
+ * file entry structure.  Structure is zeroed.  Returns new structure on
+ * success, %NULL on failure.
+ */
+static inline struct aa_entry *alloc_aa_entry(void)
+{
+	struct aa_entry *entry;
+
+	AA_DEBUG("%s\n", __FUNCTION__);
+	entry = kzalloc(sizeof(struct aa_entry), GFP_KERNEL);
+	if (entry) {
+		int i;
+		INIT_LIST_HEAD(&entry->list);
+		for (i = 0; i <= POS_AA_FILE_MAX; i++) {
+			INIT_LIST_HEAD(&entry->listp[i]);
+		}
+	}
+	return entry;
+}
+
+/**
+ * free_aaprofile_rcu - rcu callback for free profiles
+ * @head: rcu_head struct of the profile whose reference is being put.
+ *
+ * the rcu callback routine, which delays the freeing of a profile when
+ * its last reference is put.
+ */
+static void free_aaprofile_rcu(struct rcu_head *head)
+{
+	struct aaprofile *p = container_of(head, struct aaprofile, rcu);
+	free_aaprofile(p);
+}
+
+/**
+ * task_remove - remove profile from a task's subdomain
+ * @sd: task's subdomain
+ *
+ * remove the active profile from a task's subdomain, switching the task
+ * to an unconfined state.
+ */
+static inline void task_remove(struct subdomain *sd)
+{
+	/* spin_lock(&sd_lock) held here */
+	AA_DEBUG("%s: removing profile from task %s(%d) profile %s active %s\n",
+		 __FUNCTION__,
+		 sd->task->comm,
+		 sd->task->pid,
+		 BASE_PROFILE(sd->active)->name,
+		 sd->active->name);
+
+	aa_switch_unconfined(sd);
+}
+
+/** taskremove_iter - Iterator to unconfine subdomains which match cookie
+ * @sd: subdomain to consider for profile removal
+ * @cookie: pointer to the oldprofile which is being removed
+ *
+ * If the subdomain's active profile matches old_profile,  then call
+ * task_remove() to remove the profile leaving the task (subdomain) unconfined.
+ */
+static int taskremove_iter(struct subdomain *sd, void *cookie)
+{
+	struct aaprofile *old_profile = (struct aaprofile *)cookie;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sd_lock, flags);
+
+	if (__aa_is_confined(sd) && BASE_PROFILE(sd->active) == old_profile) {
+		task_remove(sd);
+	}
+
+	spin_unlock_irqrestore(&sd_lock, flags);
+
+	return 0;
+}
+
+/** task_replace - replace subdomain's current profile with a new profile
+ * @sd: subdomain to replace the profile on
+ * @new: new profile
+ *
+ * Replace a task's (subdomain's) active profile with a new profile.  If
+ * task was in a hat then the new profile will also be in the equivalent
+ * hat in the new profile if it exists.  If it doesn't exist the
+ * task will be placed in the special null_profile state.
+ */
+static inline void task_replace(struct subdomain *sd, struct aaprofile *new)
+{
+	AA_DEBUG("%s: replacing profile for task %s(%d) "
+		 "profile=%s (%p) active=%s (%p)\n",
+		 __FUNCTION__,
+		 sd->task->comm, sd->task->pid,
+		 BASE_PROFILE(sd->active)->name, BASE_PROFILE(sd->active),
+		 sd->active->name, sd->active);
+
+	if (!sd->active)
+		goto out;
+
+	if (IN_SUBPROFILE(sd->active)) {
+		struct aaprofile *nactive;
+
+		/* The old profile was in a hat, check to see if the new
+		 * profile has an equivalent hat */
+		nactive = __aa_find_profile(sd->active->name, &new->sub);
+
+		if (!nactive)
+			nactive = get_aaprofile(new->null_profile);
+
+		aa_switch(sd, nactive);
+		put_aaprofile(nactive);
+	} else {
+		aa_switch(sd, new);
+	}
+
+ out:
+	return;
+}
+
+/** taskreplace_iter - Iterator to replace a subdomain's profile
+ * @sd: subdomain to consider for profile replacement
+ * @cookie: pointer to the old profile which is being replaced.
+ *
+ * If the subdomain's active profile matches old_profile call
+ * task_replace() to replace with the subdomain's active profile with
+ * the new profile.
+ */
+static int taskreplace_iter(struct subdomain *sd, void *cookie)
+{
+	struct aa_taskreplace_data *data = (struct aa_taskreplace_data *)cookie;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sd_lock, flags);
+
+	if (__aa_is_confined(sd) &&
+	    BASE_PROFILE(sd->active) == data->old_profile)
+		task_replace(sd, data->new_profile);
+
+	spin_unlock_irqrestore(&sd_lock, flags);
+
+	return 0;
+}
+
+static inline int aa_inbounds(struct aa_ext *e, size_t size)
+{
+	return (e->pos + size <= e->end);
+}
+
+/**
+ * aaconvert - convert trailing values of serialized type codes
+ * @code: type code
+ * @dest: pointer to object to receive the converted value
+ * @src:  pointer to value to convert
+ *
+ * for serialized type codes which have a trailing value, convert it
+ * and place it in @dest.  If a code does not have a trailing value nop.
+ */
+static void aaconvert(enum aa_code code, void *dest, void *src)
+{
+	switch (code) {
+	case AA_U8:
+		*(u8 *)dest = *(u8 *) src;
+		break;
+	case AA_U16:
+	case AA_NAME:
+	case AA_DYN_STRING:
+		*(u16 *)dest = le16_to_cpu(get_unaligned((u16 *)src));
+		break;
+	case AA_U32:
+	case AA_STATIC_BLOB:
+		*(u32 *)dest = le32_to_cpu(get_unaligned((u32 *)src));
+		break;
+	case AA_U64:
+		*(u64 *)dest = le64_to_cpu(get_unaligned((u64 *)src));
+		break;
+	default:
+		/* nop - all other type codes do not have a trailing value */
+		;
+	}
+}
+
+/**
+ * aa_is_X - check if the next element is of type X
+ * @e: serialized data extent information
+ * @code: type code
+ * @data: object located at @e->pos (of type @code) is written into @data
+ *        if @data is non-null.  if data is null it means skip this
+ *        entry
+ * check to see if the next element in the serialized data stream is of type
+ * X and check that it is with in bounds, if so put the associated value in
+ * @data.
+ * return the size of bytes associated with the returned data
+ *        for complex object like blob and string a pointer to the allocated
+ *        data is returned in data, but the size of the blob or string is
+ *        returned.
+ */
+static u32 aa_is_X(struct aa_ext *e, enum aa_code code, void *data)
+{
+	void *pos = e->pos;
+	int ret = 0;
+	if (!aa_inbounds(e, AA_CODE_BYTE + aacode_datasize[code]))
+		goto fail;
+	if (code != *(u8 *)e->pos)
+		goto out;
+	e->pos += AA_CODE_BYTE;
+	if (code == AA_NAME) {
+		u16 size;
+		/* name codes are followed by X bytes */
+		size = le16_to_cpu(get_unaligned((u16 *)e->pos));
+		if (!aa_inbounds(e, (size_t) size))
+			goto fail;
+		if (data)
+			*(u16 *)data = size;
+		e->pos += aacode_datasize[code];
+		ret = 1 + aacode_datasize[code];
+	} else if (code == AA_DYN_STRING) {
+		u16 size;
+		char *str;
+		/* strings codes are followed by X bytes */
+		size = le16_to_cpu(get_unaligned((u16 *)e->pos));
+		e->pos += aacode_datasize[code];
+		if (!aa_inbounds(e, (size_t) size))
+			goto fail;
+		if (data) {
+			* (char **)data = NULL;
+			str = kmalloc(size, GFP_KERNEL);
+			if (!str)
+				goto fail;
+			memcpy(str, e->pos, (size_t) size);
+			str[size-1] = '\0';
+			* (char **)data = str;
+		}
+		e->pos += size;
+		ret = size;
+	} else if (code == AA_STATIC_BLOB) {
+		u32 size;
+		/* blobs are followed by X bytes, that can be 2^32 */
+		size = le32_to_cpu(get_unaligned((u32 *)e->pos));
+		e->pos += aacode_datasize[code];
+		if (!aa_inbounds(e, (size_t) size))
+			goto fail;
+		if (data)
+			memcpy(data, e->pos, (size_t) size);
+		e->pos += size;
+		ret = size;
+	} else {
+		if (data)
+			aaconvert(code, data, e->pos);
+		e->pos += aacode_datasize[code];
+		ret = 1 + aacode_datasize[code];
+	}
+out:
+	return ret;
+fail:
+	e->pos = pos;
+	return 0;
+}
+
+/**
+ * aa_is_nameX - check is the next element is of type X with a name of @name
+ * @e: serialized data extent information
+ * @code: type code
+ * @data: location to store deserialized data if match isX criteria
+ * @name: name to match to the serialized element.
+ *
+ * check that the next serialized data element is of type X and has a tag
+ * name @name.  If the code matches and name (if specified) matches then
+ * the packed data is unpacked into *data.  (Note for strings this is the
+ * size, and the next data in the stream is the string data)
+ * returns %0 if either match failes
+ */
+static int aa_is_nameX(struct aa_ext *e, enum aa_code code, void *data,
+		       const char *name)
+{
+	void *pos = e->pos;
+	u16 size;
+	u32 ret;
+	/* check for presence of a tagname, and if present name size
+	 * AA_NAME tag value is a u16 */
+	if (aa_is_X(e, AA_NAME, &size)) {
+		/* if a name is specified it must match. otherwise skip tag */
+		if (name && ((strlen(name) != size-1) ||
+			     strncmp(name, (char *)e->pos, (size_t)size-1)))
+			goto fail;
+		e->pos += size;
+	}
+	/* now check if data actually matches */
+	ret = aa_is_X(e, code, data);
+	if (!ret)
+		goto fail;
+	return ret;
+
+fail:
+	e->pos = pos;
+	return 0;
+}
+
+/* macro to wrap error case to make a block of reads look nicer */
+#define AA_READ_X(E, C, D, N) \
+	do { \
+		u32 __ret; \
+		__ret = aa_is_nameX((E), (C), (D), (N)); \
+		if (!__ret) \
+			goto fail; \
+	} while (0)
+
+/**
+ * aa_activate_net_entry - unpacked serialized net entries
+ * @e: serialized data extent information
+ *
+ * Ignore/skips net entries if they are present in the serialized data
+ * stream.  Network confinement rules are currently unsupported but some
+ * user side tools can generate them so they are currently ignored.
+ */
+static inline int aa_activate_net_entry(struct aa_ext *e)
+{
+	AA_READ_X(e, AA_STRUCT, NULL, "ne");
+	AA_READ_X(e, AA_U32, NULL, NULL);
+	AA_READ_X(e, AA_U32, NULL, NULL);
+	AA_READ_X(e, AA_U32, NULL, NULL);
+	AA_READ_X(e, AA_U16, NULL, NULL);
+	AA_READ_X(e, AA_U16, NULL, NULL);
+	AA_READ_X(e, AA_U32, NULL, NULL);
+	AA_READ_X(e, AA_U32, NULL, NULL);
+	AA_READ_X(e, AA_U16, NULL, NULL);
+	AA_READ_X(e, AA_U16, NULL, NULL);
+	/* interface name is optional so just ignore return code */
+	aa_is_nameX(e, AA_DYN_STRING, NULL, NULL);
+	AA_READ_X(e, AA_STRUCTEND, NULL, NULL);
+
+	return 1;
+fail:
+	return 0;
+}
+
+/**
+ * aa_activate_file_entry - unpack serialized file entry
+ * @e: serialized data extent information
+ *
+ * unpack the information used for a file ACL entry.
+ */
+static inline struct aa_entry *aa_activate_file_entry(struct aa_ext *e)
+{
+	struct aa_entry *entry = NULL;
+
+	if (!(entry = alloc_aa_entry()))
+		goto fail;
+
+	AA_READ_X(e, AA_STRUCT, NULL, "fe");
+	AA_READ_X(e, AA_DYN_STRING, &entry->filename, NULL);
+	AA_READ_X(e, AA_U32, &entry->mode, "file.mode");
+	AA_READ_X(e, AA_U32, &entry->type, "file.pattern_type");
+
+	entry->extradata = aamatch_alloc(entry->type);
+	if (IS_ERR(entry->extradata)) {
+		entry->extradata = NULL;
+		goto fail;
+	}
+
+	if (entry->extradata &&
+	    aamatch_serialize(entry->extradata, e, aa_is_nameX) != 0) {
+		goto fail;
+	}
+	AA_READ_X(e, AA_STRUCTEND, NULL, NULL);
+
+	switch (entry->type) {
+	case aa_entry_literal:
+		AA_DEBUG("%s: %s [no pattern] mode=0x%x\n",
+			 __FUNCTION__,
+			 entry->filename,
+			 entry->mode);
+		break;
+	case aa_entry_tailglob:
+		AA_DEBUG("%s: %s [tailglob] mode=0x%x\n",
+			 __FUNCTION__,
+			 entry->filename,
+			 entry->mode);
+		break;
+	case aa_entry_pattern:
+		AA_DEBUG("%s: %s mode=0x%x\n",
+			 __FUNCTION__,
+			 entry->filename,
+			 entry->mode);
+		break;
+	default:
+		AA_WARN("%s: INVALID entry_match_type %d\n",
+			__FUNCTION__,
+			(int)entry->type);
+		goto fail;
+	}
+
+	return entry;
+
+fail:
+	aamatch_free(entry->extradata);
+	free_aa_entry(entry);
+	return NULL;
+}
+
+/**
+ * check_rule_and_add - check a file rule is valid and add to a profile
+ * @file_entry: file rule to add
+ * @profile: profile to add the rule to
+ * @message: error message returned if the addition failes.
+ *
+ * perform consistency check to ensure that a file rule entry is valid.
+ * If the rule is valid it is added to the profile.
+ */
+static inline int check_rule_and_add(struct aa_entry *file_entry,
+				     struct aaprofile *profile,
+				     const char **message)
+{
+	/* verify consistency of x, px, ix, ux for entry against
+	   possible duplicates for this entry */
+	int mode = AA_EXEC_MODIFIER_MASK(file_entry->mode);
+	int i;
+
+	if (mode && !(AA_MAY_EXEC & file_entry->mode)) {
+		*message = "inconsistent rule, x modifiers without x";
+		goto out;
+	}
+
+	/* check that only 1 of the modifiers is set */
+	if (mode && (mode & (mode - 1))) {
+		*message = "inconsistent rule, multiple x modifiers";
+		goto out;
+	}
+
+	list_add(&file_entry->list, &profile->file_entry);
+	profile->num_file_entries++;
+
+	mode = file_entry->mode;
+
+	/* Handle partitioned lists
+	 * Chain entries onto sublists based on individual
+	 * permission bits. This allows more rapid searching.
+	 */
+	for (i = 0; i <= POS_AA_FILE_MAX; i++) {
+		if (mode & (1 << i))
+			/* profile->file_entryp[i] initially set to
+			 * NULL in alloc_aaprofile() */
+			list_add(&file_entry->listp[i],
+				 &profile->file_entryp[i]);
+	}
+
+	return 1;
+
+out:
+	free_aa_entry(file_entry);
+	return 0;
+}
+
+#define AA_ENTRY_LIST(NAME) \
+	do { \
+	if (aa_is_nameX(e, AA_LIST, NULL, (NAME))) { \
+		rulename = ""; \
+		error_string = "Invalid file entry"; \
+		while (!aa_is_nameX(e, AA_LISTEND, NULL, NULL)) { \
+			struct aa_entry *file_entry; \
+			file_entry = aa_activate_file_entry(e); \
+			if (!file_entry) \
+				goto fail; \
+			if (!check_rule_and_add(file_entry, profile, \
+						&error_string)) { \
+				rulename = file_entry->filename; \
+				goto fail; \
+			} \
+		} \
+	} \
+	} while (0)
+
+/**
+ * aa_activate_profile - unpack a serialized profile
+ * @e: serialized data extent information
+ * @error: error code returned if unpacking fails
+ */
+static struct aaprofile *aa_activate_profile(struct aa_ext *e, ssize_t *error)
+{
+	struct aaprofile *profile = NULL;
+	const char *rulename = "";
+	const char *error_string = "Invalid Profile";
+
+	*error = -EPROTO;
+
+	profile = alloc_aaprofile();
+	if (!profile) {
+		error_string = "Could not allocate profile";
+		*error = -ENOMEM;
+		goto fail;
+	}
+
+	/* check that we have the right struct being passed */
+	AA_READ_X(e, AA_STRUCT, NULL, "profile");
+	AA_READ_X(e, AA_DYN_STRING, &profile->name, NULL);
+
+	error_string = "Invalid flags";
+	/* per profile debug flags (debug, complain, audit) */
+	AA_READ_X(e, AA_STRUCT, NULL, "flags");
+	AA_READ_X(e, AA_U32, &(profile->flags.debug), "profile.flags.debug");
+	AA_READ_X(e, AA_U32, &(profile->flags.complain),
+		  "profile.flags.complain");
+	AA_READ_X(e, AA_U32, &(profile->flags.audit), "profile.flags.audit");
+	AA_READ_X(e, AA_STRUCTEND, NULL, NULL);
+
+	error_string = "Invalid capabilities";
+	AA_READ_X(e, AA_U32, &(profile->capabilities), "profile.capabilities");
+
+	/* get the file entries. */
+	AA_ENTRY_LIST("pgent");		/* pcre rules */
+	AA_ENTRY_LIST("sgent");		/* simple globs */
+	AA_ENTRY_LIST("fent");		/* regular file entries */
+
+	/* get the net entries */
+	if (aa_is_nameX(e, AA_LIST, NULL, "net")) {
+		error_string = "Invalid net entry";
+		while (!aa_is_nameX(e, AA_LISTEND, NULL, NULL)) {
+			if (!aa_activate_net_entry(e))
+				goto fail;
+		}
+	}
+	rulename = "";
+
+	/* get subprofiles */
+	if (aa_is_nameX(e, AA_LIST, NULL, "hats")) {
+		error_string = "Invalid profile hat";
+		while (!aa_is_nameX(e, AA_LISTEND, NULL, NULL)) {
+			struct aaprofile *subprofile;
+			subprofile = aa_activate_profile(e, error);
+			if (!subprofile)
+				goto fail;
+			subprofile->parent = profile;
+			list_add(&subprofile->list, &profile->sub);
+		}
+	}
+
+	error_string = "Invalid end of profile";
+	AA_READ_X(e, AA_STRUCTEND, NULL, NULL);
+
+	return profile;
+
+fail:
+	AA_WARN("%s: %s %s in profile %s\n", INTERFACE_ID, rulename,
+		error_string, profile && profile->name ? profile->name
+		: "unknown");
+
+	if (profile) {
+		free_aaprofile(profile);
+		profile = NULL;
+	}
+
+	return NULL;
+}
+
+/**
+ * aa_activate_top_profile - unpack a serialized base profile
+ * @e: serialized data extent information
+ * @error: error code returned if unpacking fails
+ *
+ * check interface version unpack a profile and all its hats and patch
+ * in any extra information that the profile needs.
+ */
+static void *aa_activate_top_profile(struct aa_ext *e, ssize_t *error)
+{
+	struct aaprofile *profile = NULL;
+
+	/* get the interface version */
+	if (!aa_is_nameX(e, AA_U32, &e->version, "version")) {
+		AA_WARN("%s: version missing\n", INTERFACE_ID);
+		*error = -EPROTONOSUPPORT;
+		goto fail;
+	}
+
+	/* check that the interface version is currently supported */
+	if (e->version != 2) {
+		AA_WARN("%s: unsupported interface version (%d)\n",
+			INTERFACE_ID, e->version);
+		*error = -EPROTONOSUPPORT;
+		goto fail;
+	}
+
+	profile = aa_activate_profile(e, error);
+	if (!profile)
+		goto fail;
+
+	if (!list_empty(&profile->sub) || profile->flags.complain) {
+		if (attach_nullprofile(profile))
+			goto fail;
+	}
+	return profile;
+
+fail:
+	free_aaprofile(profile);
+	return NULL;
+}
+
+/**
+ * aa_file_prof_add - add a new profile to the profile list
+ * @data: serialized data stream
+ * @size: size of the serialized data stream
+ *
+ * unpack and add a profile to the profile list.  Return %0 or error
+ */
+ssize_t aa_file_prof_add(void *data, size_t size)
+{
+	struct aaprofile *profile = NULL;
+
+	struct aa_ext e = {
+		.start = data,
+		.end = data + size,
+		.pos = data
+	};
+	ssize_t error;
+
+	profile = aa_activate_top_profile(&e, &error);
+	if (!profile) {
+		AA_DEBUG("couldn't activate profile\n");
+		goto out;
+	}
+
+	/* aa_activate_top_profile allocates profile with initial 1 count
+	 * aa_profilelist_add transfers that ref to profile list without
+	 * further incrementing
+	 */
+	if (aa_profilelist_add(profile)) {
+		error = size;
+	} else {
+		AA_WARN("trying to add profile (%s) that already exists.\n",
+			profile->name);
+		put_aaprofile(profile);
+		error = -EEXIST;
+	}
+
+out:
+	return error;
+}
+
+/**
+ * aa_file_prof_repl - replace a profile on the profile list
+ * @udata: serialized data stream
+ * @size: size of the serialized data stream
+ *
+ * unpack and replace a profile on the profile list and uses of that profile
+ * by any subdomain.  If the profile does not exist on the profile list
+ * it is added.  Return %0 or error.
+ */
+ssize_t aa_file_prof_repl(void *udata, size_t size)
+{
+	struct aa_taskreplace_data data;
+	struct aa_ext e = {
+		.start = udata,
+		.end = udata + size,
+		.pos = udata
+	};
+
+	ssize_t error;
+
+	data.new_profile = aa_activate_top_profile(&e, &error);
+	if (!data.new_profile) {
+		AA_DEBUG("couldn't activate profile\n");
+		goto out;
+	}
+
+	/* Refcount on data.new_profile is 1 (aa_activate_top_profile).
+	 *
+	 * This reference will be inherited by aa_profilelist_replace for it's
+	 * profile list reference but this isn't sufficient.
+	 *
+	 * Another replace (*for-same-profile*) may race us here.
+	 * Task A calls aa_profilelist_replace(new_profile) and is interrupted.
+	 * Task B old_profile = aa_profilelist_replace() will return task A's
+	 * new_profile with the count of 1.  If task B proceeeds to put this
+	 * profile it will dissapear from under task A.
+	 *
+	 * Grab extra reference on new_profile to prevent this
+	 */
+
+	get_aaprofile(data.new_profile);
+
+	data.old_profile = aa_profilelist_replace(data.new_profile);
+
+	/* If there was an old profile,  find all currently executing tasks
+	 * using this profile and replace the old profile with the new.
+	 */
+	if (data.old_profile) {
+		AA_DEBUG("%s: try to replace profile (%p)%s\n",
+			 __FUNCTION__,
+			 data.old_profile,
+			 data.old_profile->name);
+
+		aa_subdomainlist_iterate(taskreplace_iter, (void *)&data);
+
+		/* it's off global list, and we are done replacing */
+		put_aaprofile(data.old_profile);
+	}
+
+	/* release extra reference obtained above (race) */
+	put_aaprofile(data.new_profile);
+
+	error = size;
+
+out:
+	return error;
+}
+
+/**
+ * aa_file_prof_remove - remove a profile from the system
+ * @name: name of the profile to remove
+ * @size: size of the name
+ *
+ * remove a profile from the profile list and all subdomain references
+ * to said profile.  Return %0 on success, else error.
+ */
+ssize_t aa_file_prof_remove(const char *name, size_t size)
+{
+	struct aaprofile *old_profile;
+
+	/* if the old profile exists it will be removed from the list and
+	 * a reference is returned.
+	 */
+	old_profile = aa_profilelist_remove(name);
+
+	if (old_profile) {
+		/* remove profile from any tasks using it */
+		aa_subdomainlist_iterate(taskremove_iter, (void *)old_profile);
+
+		/* drop reference obtained by aa_profilelist_remove */
+		put_aaprofile(old_profile);
+	} else {
+		AA_WARN("%s: trying to remove profile (%s) that "
+			"doesn't exist - skipping.\n", __FUNCTION__, name);
+		return -ENOENT;
+	}
+
+	return size;
+}
+
+/**
+ * free_aaprofile_kref - free aaprofile by kref (called by put_aaprofile)
+ * @kr: kref callback for freeing of a profile
+ */
+void free_aaprofile_kref(struct kref *kr)
+{
+	struct aaprofile *p=container_of(kr, struct aaprofile, count);
+
+	call_rcu(&p->rcu, free_aaprofile_rcu);
+}
+
+/**
+ * free_aaprofile - free aaprofile structure
+ * @profile: the profile to free
+ *
+ * free a profile, its file entries hats and null_profile.  All references
+ * to the profile, its hats and null_profile must have been put.
+ * If the profile was referenced by a subdomain free_aaprofile should be
+ * called from an rcu callback routine.
+ */
+void free_aaprofile(struct aaprofile *profile)
+{
+	struct aa_entry *ent, *tmp;
+	struct aaprofile *p, *ptmp;
+
+	AA_DEBUG("%s(%p)\n", __FUNCTION__, profile);
+
+	if (!profile)
+		return;
+
+	/* profile is still on global profile list -- invalid */
+	if (!list_empty(&profile->list)) {
+		AA_ERROR("%s: internal error, "
+			 "profile '%s' still on global list\n",
+			 __FUNCTION__,
+			 profile->name);
+		BUG();
+	}
+
+	list_for_each_entry_safe(ent, tmp, &profile->file_entry, list) {
+		if (ent->filename)
+			AA_DEBUG("freeing aa_entry: %p %s\n",
+				 ent->filename, ent->filename);
+		list_del_init(&ent->list);
+		free_aa_entry(ent);
+	}
+
+	/* use free_aaprofile instead of put_aaprofile to destroy the
+	 * null_profile, because the null_profile use the same reference
+	 * counting as hats, ie. the count goes to the base profile.
+	 */
+	free_aaprofile(profile->null_profile);
+	list_for_each_entry_safe(p, ptmp, &profile->sub, list) {
+		list_del_init(&p->list);
+		p->parent = NULL;
+		put_aaprofile(p);
+	}
+
+	if (profile->name) {
+		AA_DEBUG("%s: %s\n", __FUNCTION__, profile->name);
+		kfree(profile->name);
+	}
+
+	kfree(profile);
+}
--- /dev/null
+++ linux-2.6.17-rc1/security/apparmor/module_interface.h
@@ -0,0 +1,37 @@
+#ifndef __MODULEINTERFACE_H
+#define __MODULEINTERFACE_H
+
+/* Codes of the types of basic structures that are understood */
+#define AA_CODE_BYTE (sizeof(u8))
+#define INTERFACE_ID "INTERFACE"
+
+#define SUBDOMAIN_INTERFACE_VERSION 2
+
+enum aa_code {
+	AA_U8,
+	AA_U16,
+	AA_U32,
+	AA_U64,
+	AA_NAME,	/* same as string except it is items name */
+	AA_DYN_STRING,
+	AA_STATIC_BLOB,
+	AA_STRUCT,
+	AA_STRUCTEND,
+	AA_LIST,
+	AA_LISTEND,
+	AA_OFFSET,
+	AA_BAD
+};
+
+/* aa_ext tracks the kernel buffer and read position in it.  The interface
+ * data is copied into a kernel buffer in apparmorfs and then handed off to
+ * the activate routines.
+ */
+struct aa_ext {
+	void *start;
+	void *end;
+	void *pos;	/* pointer to current position in the buffer */
+	u32 version;
+};
+
+#endif /* __MODULEINTERFACE_H */
-
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