v4.19.13 snapshot.
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
new file mode 100644
index 0000000..e09fe4d
--- /dev/null
+++ b/security/apparmor/apparmorfs.c
@@ -0,0 +1,2573 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /sys/kernel/security/apparmor interface functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 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.
+ */
+
+#include <linux/ctype.h>
+#include <linux/security.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/capability.h>
+#include <linux/rcupdate.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <uapi/linux/major.h>
+#include <uapi/linux/magic.h>
+
+#include "include/apparmor.h"
+#include "include/apparmorfs.h"
+#include "include/audit.h"
+#include "include/cred.h"
+#include "include/crypto.h"
+#include "include/ipc.h"
+#include "include/label.h"
+#include "include/policy.h"
+#include "include/policy_ns.h"
+#include "include/resource.h"
+#include "include/policy_unpack.h"
+
+/*
+ * The apparmor filesystem interface used for policy load and introspection
+ * The interface is split into two main components based on their function
+ * a securityfs component:
+ * used for static files that are always available, and which allows
+ * userspace to specificy the location of the security filesystem.
+ *
+ * fns and data are prefixed with
+ * aa_sfs_
+ *
+ * an apparmorfs component:
+ * used loaded policy content and introspection. It is not part of a
+ * regular mounted filesystem and is available only through the magic
+ * policy symlink in the root of the securityfs apparmor/ directory.
+ * Tasks queries will be magically redirected to the correct portion
+ * of the policy tree based on their confinement.
+ *
+ * fns and data are prefixed with
+ * aafs_
+ *
+ * The aa_fs_ prefix is used to indicate the fn is used by both the
+ * securityfs and apparmorfs filesystems.
+ */
+
+
+/*
+ * support fns
+ */
+
+/**
+ * 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(const 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;
+}
+
+
+/*
+ * aafs - core fns and data for the policy tree
+ */
+
+#define AAFS_NAME "apparmorfs"
+static struct vfsmount *aafs_mnt;
+static int aafs_count;
+
+
+static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
+{
+ seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
+ return 0;
+}
+
+static void aafs_evict_inode(struct inode *inode)
+{
+ truncate_inode_pages_final(&inode->i_data);
+ clear_inode(inode);
+ if (S_ISLNK(inode->i_mode))
+ kfree(inode->i_link);
+}
+
+static const struct super_operations aafs_super_ops = {
+ .statfs = simple_statfs,
+ .evict_inode = aafs_evict_inode,
+ .show_path = aafs_show_path,
+};
+
+static int fill_super(struct super_block *sb, void *data, int silent)
+{
+ static struct tree_descr files[] = { {""} };
+ int error;
+
+ error = simple_fill_super(sb, AAFS_MAGIC, files);
+ if (error)
+ return error;
+ sb->s_op = &aafs_super_ops;
+
+ return 0;
+}
+
+static struct dentry *aafs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_single(fs_type, flags, data, fill_super);
+}
+
+static struct file_system_type aafs_ops = {
+ .owner = THIS_MODULE,
+ .name = AAFS_NAME,
+ .mount = aafs_mount,
+ .kill_sb = kill_anon_super,
+};
+
+/**
+ * __aafs_setup_d_inode - basic inode setup for apparmorfs
+ * @dir: parent directory for the dentry
+ * @dentry: dentry we are seting the inode up for
+ * @mode: permissions the file should have
+ * @data: data to store on inode.i_private, available in open()
+ * @link: if symlink, symlink target string
+ * @fops: struct file_operations that should be used
+ * @iops: struct of inode_operations that should be used
+ */
+static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
+ umode_t mode, void *data, char *link,
+ const struct file_operations *fops,
+ const struct inode_operations *iops)
+{
+ struct inode *inode = new_inode(dir->i_sb);
+
+ AA_BUG(!dir);
+ AA_BUG(!dentry);
+
+ if (!inode)
+ return -ENOMEM;
+
+ inode->i_ino = get_next_ino();
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ inode->i_private = data;
+ if (S_ISDIR(mode)) {
+ inode->i_op = iops ? iops : &simple_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ inc_nlink(inode);
+ inc_nlink(dir);
+ } else if (S_ISLNK(mode)) {
+ inode->i_op = iops ? iops : &simple_symlink_inode_operations;
+ inode->i_link = link;
+ } else {
+ inode->i_fop = fops;
+ }
+ d_instantiate(dentry, inode);
+ dget(dentry);
+
+ return 0;
+}
+
+/**
+ * aafs_create - create a dentry in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @mode: permissions the file should have
+ * @parent: parent directory for this dentry
+ * @data: data to store on inode.i_private, available in open()
+ * @link: if symlink, symlink target string
+ * @fops: struct file_operations that should be used for
+ * @iops: struct of inode_operations that should be used
+ *
+ * This is the basic "create a xxx" function for apparmorfs.
+ *
+ * Returns a pointer to a dentry if it succeeds, that must be free with
+ * aafs_remove(). Will return ERR_PTR on failure.
+ */
+static struct dentry *aafs_create(const char *name, umode_t mode,
+ struct dentry *parent, void *data, void *link,
+ const struct file_operations *fops,
+ const struct inode_operations *iops)
+{
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+
+ AA_BUG(!name);
+ AA_BUG(!parent);
+
+ if (!(mode & S_IFMT))
+ mode = (mode & S_IALLUGO) | S_IFREG;
+
+ error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
+ if (error)
+ return ERR_PTR(error);
+
+ dir = d_inode(parent);
+
+ inode_lock(dir);
+ dentry = lookup_one_len(name, parent, strlen(name));
+ if (IS_ERR(dentry)) {
+ error = PTR_ERR(dentry);
+ goto fail_lock;
+ }
+
+ if (d_really_is_positive(dentry)) {
+ error = -EEXIST;
+ goto fail_dentry;
+ }
+
+ error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
+ if (error)
+ goto fail_dentry;
+ inode_unlock(dir);
+
+ return dentry;
+
+fail_dentry:
+ dput(dentry);
+
+fail_lock:
+ inode_unlock(dir);
+ simple_release_fs(&aafs_mnt, &aafs_count);
+
+ return ERR_PTR(error);
+}
+
+/**
+ * aafs_create_file - create a file in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @mode: permissions the file should have
+ * @parent: parent directory for this dentry
+ * @data: data to store on inode.i_private, available in open()
+ * @fops: struct file_operations that should be used for
+ *
+ * see aafs_create
+ */
+static struct dentry *aafs_create_file(const char *name, umode_t mode,
+ struct dentry *parent, void *data,
+ const struct file_operations *fops)
+{
+ return aafs_create(name, mode, parent, data, NULL, fops, NULL);
+}
+
+/**
+ * aafs_create_dir - create a directory in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @parent: parent directory for this dentry
+ *
+ * see aafs_create
+ */
+static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
+{
+ return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
+ NULL);
+}
+
+/**
+ * aafs_create_symlink - create a symlink in the apparmorfs filesystem
+ * @name: name of dentry to create
+ * @parent: parent directory for this dentry
+ * @target: if symlink, symlink target string
+ * @private: private data
+ * @iops: struct of inode_operations that should be used
+ *
+ * If @target parameter is %NULL, then the @iops parameter needs to be
+ * setup to handle .readlink and .get_link inode_operations.
+ */
+static struct dentry *aafs_create_symlink(const char *name,
+ struct dentry *parent,
+ const char *target,
+ void *private,
+ const struct inode_operations *iops)
+{
+ struct dentry *dent;
+ char *link = NULL;
+
+ if (target) {
+ if (!link)
+ return ERR_PTR(-ENOMEM);
+ }
+ dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL,
+ iops);
+ if (IS_ERR(dent))
+ kfree(link);
+
+ return dent;
+}
+
+/**
+ * aafs_remove - removes a file or directory from the apparmorfs filesystem
+ *
+ * @dentry: dentry of the file/directory/symlink to removed.
+ */
+static void aafs_remove(struct dentry *dentry)
+{
+ struct inode *dir;
+
+ if (!dentry || IS_ERR(dentry))
+ return;
+
+ dir = d_inode(dentry->d_parent);
+ inode_lock(dir);
+ if (simple_positive(dentry)) {
+ if (d_is_dir(dentry))
+ simple_rmdir(dir, dentry);
+ else
+ simple_unlink(dir, dentry);
+ dput(dentry);
+ }
+ inode_unlock(dir);
+ simple_release_fs(&aafs_mnt, &aafs_count);
+}
+
+
+/*
+ * aa_fs - policy load/replace/remove
+ */
+
+/**
+ * aa_simple_write_to_buffer - common routine for getting policy from user
+ * @userbuf: user buffer to copy data from (NOT NULL)
+ * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
+ * @copy_size: size of data to copy from user buffer
+ * @pos: position write is at in the file (NOT NULL)
+ *
+ * Returns: kernel buffer containing copy of user buffer data or an
+ * ERR_PTR on failure.
+ */
+static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
+ size_t alloc_size,
+ size_t copy_size,
+ loff_t *pos)
+{
+ struct aa_loaddata *data;
+
+ AA_BUG(copy_size > alloc_size);
+
+ if (*pos != 0)
+ /* only writes from pos 0, that is complete writes */
+ return ERR_PTR(-ESPIPE);
+
+ /* freed by caller to simple_write_to_buffer */
+ data = aa_loaddata_alloc(alloc_size);
+ if (IS_ERR(data))
+ return data;
+
+ data->size = copy_size;
+ if (copy_from_user(data->data, userbuf, copy_size)) {
+ kvfree(data);
+ return ERR_PTR(-EFAULT);
+ }
+
+ return data;
+}
+
+static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
+ loff_t *pos, struct aa_ns *ns)
+{
+ struct aa_loaddata *data;
+ struct aa_label *label;
+ ssize_t error;
+
+ label = begin_current_label_crit_section();
+
+ /* high level check about policy management - fine grained in
+ * below after unpack
+ */
+ error = aa_may_manage_policy(label, ns, mask);
+ if (error)
+ return error;
+
+ data = aa_simple_write_to_buffer(buf, size, size, pos);
+ error = PTR_ERR(data);
+ if (!IS_ERR(data)) {
+ error = aa_replace_profiles(ns, label, mask, data);
+ aa_put_loaddata(data);
+ }
+ end_current_label_crit_section(label);
+
+ return error;
+}
+
+/* .load file hook fn to load policy */
+static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
+ loff_t *pos)
+{
+ struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+ int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
+
+ aa_put_ns(ns);
+
+ return error;
+}
+
+static const struct file_operations aa_fs_profile_load = {
+ .write = profile_load,
+ .llseek = default_llseek,
+};
+
+/* .replace file hook fn to load and/or replace policy */
+static ssize_t profile_replace(struct file *f, const char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+ int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
+ buf, size, pos, ns);
+ aa_put_ns(ns);
+
+ return error;
+}
+
+static const struct file_operations aa_fs_profile_replace = {
+ .write = profile_replace,
+ .llseek = default_llseek,
+};
+
+/* .remove file hook fn to remove loaded policy */
+static ssize_t profile_remove(struct file *f, const char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct aa_loaddata *data;
+ struct aa_label *label;
+ ssize_t error;
+ struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+
+ label = begin_current_label_crit_section();
+ /* high level check about policy management - fine grained in
+ * below after unpack
+ */
+ error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
+ if (error)
+ goto out;
+
+ /*
+ * aa_remove_profile needs a null terminated string so 1 extra
+ * byte is allocated and the copied data is null terminated.
+ */
+ data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
+
+ error = PTR_ERR(data);
+ if (!IS_ERR(data)) {
+ data->data[size] = 0;
+ error = aa_remove_profiles(ns, label, data->data, size);
+ aa_put_loaddata(data);
+ }
+ out:
+ end_current_label_crit_section(label);
+ aa_put_ns(ns);
+ return error;
+}
+
+static const struct file_operations aa_fs_profile_remove = {
+ .write = profile_remove,
+ .llseek = default_llseek,
+};
+
+struct aa_revision {
+ struct aa_ns *ns;
+ long last_read;
+};
+
+/* revision file hook fn for policy loads */
+static int ns_revision_release(struct inode *inode, struct file *file)
+{
+ struct aa_revision *rev = file->private_data;
+
+ if (rev) {
+ aa_put_ns(rev->ns);
+ kfree(rev);
+ }
+
+ return 0;
+}
+
+static ssize_t ns_revision_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct aa_revision *rev = file->private_data;
+ char buffer[32];
+ long last_read;
+ int avail;
+
+ mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+ last_read = rev->last_read;
+ if (last_read == rev->ns->revision) {
+ mutex_unlock(&rev->ns->lock);
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ if (wait_event_interruptible(rev->ns->wait,
+ last_read !=
+ READ_ONCE(rev->ns->revision)))
+ return -ERESTARTSYS;
+ mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+ }
+
+ avail = sprintf(buffer, "%ld\n", rev->ns->revision);
+ if (*ppos + size > avail) {
+ rev->last_read = rev->ns->revision;
+ *ppos = 0;
+ }
+ mutex_unlock(&rev->ns->lock);
+
+ return simple_read_from_buffer(buf, size, ppos, buffer, avail);
+}
+
+static int ns_revision_open(struct inode *inode, struct file *file)
+{
+ struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
+
+ if (!rev)
+ return -ENOMEM;
+
+ rev->ns = aa_get_ns(inode->i_private);
+ if (!rev->ns)
+ rev->ns = aa_get_current_ns();
+ file->private_data = rev;
+
+ return 0;
+}
+
+static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
+{
+ struct aa_revision *rev = file->private_data;
+ __poll_t mask = 0;
+
+ if (rev) {
+ mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+ poll_wait(file, &rev->ns->wait, pt);
+ if (rev->last_read < rev->ns->revision)
+ mask |= EPOLLIN | EPOLLRDNORM;
+ mutex_unlock(&rev->ns->lock);
+ }
+
+ return mask;
+}
+
+void __aa_bump_ns_revision(struct aa_ns *ns)
+{
+ ns->revision++;
+ wake_up_interruptible(&ns->wait);
+}
+
+static const struct file_operations aa_fs_ns_revision_fops = {
+ .owner = THIS_MODULE,
+ .open = ns_revision_open,
+ .poll = ns_revision_poll,
+ .read = ns_revision_read,
+ .llseek = generic_file_llseek,
+ .release = ns_revision_release,
+};
+
+static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
+ const char *match_str, size_t match_len)
+{
+ struct aa_perms tmp = { };
+ struct aa_dfa *dfa;
+ unsigned int state = 0;
+
+ if (profile_unconfined(profile))
+ return;
+ if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
+ dfa = profile->file.dfa;
+ state = aa_dfa_match_len(dfa, profile->file.start,
+ match_str + 1, match_len - 1);
+ if (state) {
+ struct path_cond cond = { };
+
+ tmp = aa_compute_fperms(dfa, state, &cond);
+ }
+ } else if (profile->policy.dfa) {
+ if (!PROFILE_MEDIATES(profile, *match_str))
+ return; /* no change to current perms */
+ dfa = profile->policy.dfa;
+ state = aa_dfa_match_len(dfa, profile->policy.start[0],
+ match_str, match_len);
+ if (state)
+ aa_compute_perms(dfa, state, &tmp);
+ }
+ aa_apply_modes_to_perms(profile, &tmp);
+ aa_perms_accum_raw(perms, &tmp);
+}
+
+
+/**
+ * query_data - queries a policy and writes its data to buf
+ * @buf: the resulting data is stored here (NOT NULL)
+ * @buf_len: size of buf
+ * @query: query string used to retrieve data
+ * @query_len: size of query including second NUL byte
+ *
+ * The buffers pointed to by buf and query may overlap. The query buffer is
+ * parsed before buf is written to.
+ *
+ * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
+ * the security confinement context and <KEY> is the name of the data to
+ * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
+ *
+ * Don't expect the contents of buf to be preserved on failure.
+ *
+ * Returns: number of characters written to buf or -errno on failure
+ */
+static ssize_t query_data(char *buf, size_t buf_len,
+ char *query, size_t query_len)
+{
+ char *out;
+ const char *key;
+ struct label_it i;
+ struct aa_label *label, *curr;
+ struct aa_profile *profile;
+ struct aa_data *data;
+ u32 bytes, blocks;
+ __le32 outle32;
+
+ if (!query_len)
+ return -EINVAL; /* need a query */
+
+ key = query + strnlen(query, query_len) + 1;
+ if (key + 1 >= query + query_len)
+ return -EINVAL; /* not enough space for a non-empty key */
+ if (key + strnlen(key, query + query_len - key) >= query + query_len)
+ return -EINVAL; /* must end with NUL */
+
+ if (buf_len < sizeof(bytes) + sizeof(blocks))
+ return -EINVAL; /* not enough space */
+
+ curr = begin_current_label_crit_section();
+ label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
+ end_current_label_crit_section(curr);
+ if (IS_ERR(label))
+ return PTR_ERR(label);
+
+ /* We are going to leave space for two numbers. The first is the total
+ * number of bytes we are writing after the first number. This is so
+ * users can read the full output without reallocation.
+ *
+ * The second number is the number of data blocks we're writing. An
+ * application might be confined by multiple policies having data in
+ * the same key.
+ */
+ memset(buf, 0, sizeof(bytes) + sizeof(blocks));
+ out = buf + sizeof(bytes) + sizeof(blocks);
+
+ blocks = 0;
+ label_for_each_confined(i, label, profile) {
+ if (!profile->data)
+ continue;
+
+ data = rhashtable_lookup_fast(profile->data, &key,
+ profile->data->p);
+
+ if (data) {
+ if (out + sizeof(outle32) + data->size > buf +
+ buf_len) {
+ aa_put_label(label);
+ return -EINVAL; /* not enough space */
+ }
+ outle32 = __cpu_to_le32(data->size);
+ memcpy(out, &outle32, sizeof(outle32));
+ out += sizeof(outle32);
+ memcpy(out, data->data, data->size);
+ out += data->size;
+ blocks++;
+ }
+ }
+ aa_put_label(label);
+
+ outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
+ memcpy(buf, &outle32, sizeof(outle32));
+ outle32 = __cpu_to_le32(blocks);
+ memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
+
+ return out - buf;
+}
+
+/**
+ * query_label - queries a label and writes permissions to buf
+ * @buf: the resulting permissions string is stored here (NOT NULL)
+ * @buf_len: size of buf
+ * @query: binary query string to match against the dfa
+ * @query_len: size of query
+ * @view_only: only compute for querier's view
+ *
+ * The buffers pointed to by buf and query may overlap. The query buffer is
+ * parsed before buf is written to.
+ *
+ * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
+ * the name of the label, in the current namespace, that is to be queried and
+ * DFA_STRING is a binary string to match against the label(s)'s DFA.
+ *
+ * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
+ * but must *not* be NUL terminated.
+ *
+ * Returns: number of characters written to buf or -errno on failure
+ */
+static ssize_t query_label(char *buf, size_t buf_len,
+ char *query, size_t query_len, bool view_only)
+{
+ struct aa_profile *profile;
+ struct aa_label *label, *curr;
+ char *label_name, *match_str;
+ size_t label_name_len, match_len;
+ struct aa_perms perms;
+ struct label_it i;
+
+ if (!query_len)
+ return -EINVAL;
+
+ label_name = query;
+ label_name_len = strnlen(query, query_len);
+ if (!label_name_len || label_name_len == query_len)
+ return -EINVAL;
+
+ /**
+ * The extra byte is to account for the null byte between the
+ * profile name and dfa string. profile_name_len is greater
+ * than zero and less than query_len, so a byte can be safely
+ * added or subtracted.
+ */
+ match_str = label_name + label_name_len + 1;
+ match_len = query_len - label_name_len - 1;
+
+ curr = begin_current_label_crit_section();
+ label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
+ end_current_label_crit_section(curr);
+ if (IS_ERR(label))
+ return PTR_ERR(label);
+
+ perms = allperms;
+ if (view_only) {
+ label_for_each_in_ns(i, labels_ns(label), label, profile) {
+ profile_query_cb(profile, &perms, match_str, match_len);
+ }
+ } else {
+ label_for_each(i, label, profile) {
+ profile_query_cb(profile, &perms, match_str, match_len);
+ }
+ }
+ aa_put_label(label);
+
+ return scnprintf(buf, buf_len,
+ "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
+ perms.allow, perms.deny, perms.audit, perms.quiet);
+}
+
+/*
+ * Transaction based IO.
+ * The file expects a write which triggers the transaction, and then
+ * possibly a read(s) which collects the result - which is stored in a
+ * file-local buffer. Once a new write is performed, a new set of results
+ * are stored in the file-local buffer.
+ */
+struct multi_transaction {
+ struct kref count;
+ ssize_t size;
+ char data[0];
+};
+
+#define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
+/* TODO: replace with per file lock */
+static DEFINE_SPINLOCK(multi_transaction_lock);
+
+static void multi_transaction_kref(struct kref *kref)
+{
+ struct multi_transaction *t;
+
+ t = container_of(kref, struct multi_transaction, count);
+ free_page((unsigned long) t);
+}
+
+static struct multi_transaction *
+get_multi_transaction(struct multi_transaction *t)
+{
+ if (t)
+ kref_get(&(t->count));
+
+ return t;
+}
+
+static void put_multi_transaction(struct multi_transaction *t)
+{
+ if (t)
+ kref_put(&(t->count), multi_transaction_kref);
+}
+
+/* does not increment @new's count */
+static void multi_transaction_set(struct file *file,
+ struct multi_transaction *new, size_t n)
+{
+ struct multi_transaction *old;
+
+ AA_BUG(n > MULTI_TRANSACTION_LIMIT);
+
+ new->size = n;
+ spin_lock(&multi_transaction_lock);
+ old = (struct multi_transaction *) file->private_data;
+ file->private_data = new;
+ spin_unlock(&multi_transaction_lock);
+ put_multi_transaction(old);
+}
+
+static struct multi_transaction *multi_transaction_new(struct file *file,
+ const char __user *buf,
+ size_t size)
+{
+ struct multi_transaction *t;
+
+ if (size > MULTI_TRANSACTION_LIMIT - 1)
+ return ERR_PTR(-EFBIG);
+
+ t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
+ if (!t)
+ return ERR_PTR(-ENOMEM);
+ kref_init(&t->count);
+ if (copy_from_user(t->data, buf, size))
+ return ERR_PTR(-EFAULT);
+
+ return t;
+}
+
+static ssize_t multi_transaction_read(struct file *file, char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct multi_transaction *t;
+ ssize_t ret;
+
+ spin_lock(&multi_transaction_lock);
+ t = get_multi_transaction(file->private_data);
+ spin_unlock(&multi_transaction_lock);
+ if (!t)
+ return 0;
+
+ ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
+ put_multi_transaction(t);
+
+ return ret;
+}
+
+static int multi_transaction_release(struct inode *inode, struct file *file)
+{
+ put_multi_transaction(file->private_data);
+
+ return 0;
+}
+
+#define QUERY_CMD_LABEL "label\0"
+#define QUERY_CMD_LABEL_LEN 6
+#define QUERY_CMD_PROFILE "profile\0"
+#define QUERY_CMD_PROFILE_LEN 8
+#define QUERY_CMD_LABELALL "labelall\0"
+#define QUERY_CMD_LABELALL_LEN 9
+#define QUERY_CMD_DATA "data\0"
+#define QUERY_CMD_DATA_LEN 5
+
+/**
+ * aa_write_access - generic permissions and data query
+ * @file: pointer to open apparmorfs/access file
+ * @ubuf: user buffer containing the complete query string (NOT NULL)
+ * @count: size of ubuf
+ * @ppos: position in the file (MUST BE ZERO)
+ *
+ * Allows for one permissions or data query per open(), write(), and read()
+ * sequence. The only queries currently supported are label-based queries for
+ * permissions or data.
+ *
+ * For permissions queries, ubuf must begin with "label\0", followed by the
+ * profile query specific format described in the query_label() function
+ * documentation.
+ *
+ * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
+ * <LABEL> is the name of the security confinement context and <KEY> is the
+ * name of the data to retrieve.
+ *
+ * Returns: number of bytes written or -errno on failure
+ */
+static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct multi_transaction *t;
+ ssize_t len;
+
+ if (*ppos)
+ return -ESPIPE;
+
+ t = multi_transaction_new(file, ubuf, count);
+ if (IS_ERR(t))
+ return PTR_ERR(t);
+
+ if (count > QUERY_CMD_PROFILE_LEN &&
+ !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
+ len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+ t->data + QUERY_CMD_PROFILE_LEN,
+ count - QUERY_CMD_PROFILE_LEN, true);
+ } else if (count > QUERY_CMD_LABEL_LEN &&
+ !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
+ len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+ t->data + QUERY_CMD_LABEL_LEN,
+ count - QUERY_CMD_LABEL_LEN, true);
+ } else if (count > QUERY_CMD_LABELALL_LEN &&
+ !memcmp(t->data, QUERY_CMD_LABELALL,
+ QUERY_CMD_LABELALL_LEN)) {
+ len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+ t->data + QUERY_CMD_LABELALL_LEN,
+ count - QUERY_CMD_LABELALL_LEN, false);
+ } else if (count > QUERY_CMD_DATA_LEN &&
+ !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
+ len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
+ t->data + QUERY_CMD_DATA_LEN,
+ count - QUERY_CMD_DATA_LEN);
+ } else
+ len = -EINVAL;
+
+ if (len < 0) {
+ put_multi_transaction(t);
+ return len;
+ }
+
+ multi_transaction_set(file, t, len);
+
+ return count;
+}
+
+static const struct file_operations aa_sfs_access = {
+ .write = aa_write_access,
+ .read = multi_transaction_read,
+ .release = multi_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+static int aa_sfs_seq_show(struct seq_file *seq, void *v)
+{
+ struct aa_sfs_entry *fs_file = seq->private;
+
+ if (!fs_file)
+ return 0;
+
+ switch (fs_file->v_type) {
+ case AA_SFS_TYPE_BOOLEAN:
+ seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
+ break;
+ case AA_SFS_TYPE_STRING:
+ seq_printf(seq, "%s\n", fs_file->v.string);
+ break;
+ case AA_SFS_TYPE_U64:
+ seq_printf(seq, "%#08lx\n", fs_file->v.u64);
+ break;
+ default:
+ /* Ignore unpritable entry types. */
+ break;
+ }
+
+ return 0;
+}
+
+static int aa_sfs_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, aa_sfs_seq_show, inode->i_private);
+}
+
+const struct file_operations aa_sfs_seq_file_ops = {
+ .owner = THIS_MODULE,
+ .open = aa_sfs_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/*
+ * profile based file operations
+ * policy/profiles/XXXX/profiles/ *
+ */
+
+#define SEQ_PROFILE_FOPS(NAME) \
+static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
+{ \
+ return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
+} \
+ \
+static const struct file_operations seq_profile_ ##NAME ##_fops = { \
+ .owner = THIS_MODULE, \
+ .open = seq_profile_ ##NAME ##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = seq_profile_release, \
+} \
+
+static int seq_profile_open(struct inode *inode, struct file *file,
+ int (*show)(struct seq_file *, void *))
+{
+ struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
+ int error = single_open(file, show, proxy);
+
+ if (error) {
+ file->private_data = NULL;
+ aa_put_proxy(proxy);
+ }
+
+ return error;
+}
+
+static int seq_profile_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *) file->private_data;
+ if (seq)
+ aa_put_proxy(seq->private);
+ return single_release(inode, file);
+}
+
+static int seq_profile_name_show(struct seq_file *seq, void *v)
+{
+ struct aa_proxy *proxy = seq->private;
+ struct aa_label *label = aa_get_label_rcu(&proxy->label);
+ struct aa_profile *profile = labels_profile(label);
+ seq_printf(seq, "%s\n", profile->base.name);
+ aa_put_label(label);
+
+ return 0;
+}
+
+static int seq_profile_mode_show(struct seq_file *seq, void *v)
+{
+ struct aa_proxy *proxy = seq->private;
+ struct aa_label *label = aa_get_label_rcu(&proxy->label);
+ struct aa_profile *profile = labels_profile(label);
+ seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
+ aa_put_label(label);
+
+ return 0;
+}
+
+static int seq_profile_attach_show(struct seq_file *seq, void *v)
+{
+ struct aa_proxy *proxy = seq->private;
+ struct aa_label *label = aa_get_label_rcu(&proxy->label);
+ struct aa_profile *profile = labels_profile(label);
+ 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_label(label);
+
+ return 0;
+}
+
+static int seq_profile_hash_show(struct seq_file *seq, void *v)
+{
+ struct aa_proxy *proxy = seq->private;
+ struct aa_label *label = aa_get_label_rcu(&proxy->label);
+ struct aa_profile *profile = labels_profile(label);
+ unsigned int i, size = aa_hash_size();
+
+ if (profile->hash) {
+ for (i = 0; i < size; i++)
+ seq_printf(seq, "%.2x", profile->hash[i]);
+ seq_putc(seq, '\n');
+ }
+ aa_put_label(label);
+
+ return 0;
+}
+
+SEQ_PROFILE_FOPS(name);
+SEQ_PROFILE_FOPS(mode);
+SEQ_PROFILE_FOPS(attach);
+SEQ_PROFILE_FOPS(hash);
+
+/*
+ * namespace based files
+ * several root files and
+ * policy/ *
+ */
+
+#define SEQ_NS_FOPS(NAME) \
+static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
+} \
+ \
+static const struct file_operations seq_ns_ ##NAME ##_fops = { \
+ .owner = THIS_MODULE, \
+ .open = seq_ns_ ##NAME ##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+} \
+
+static int seq_ns_stacked_show(struct seq_file *seq, void *v)
+{
+ struct aa_label *label;
+
+ label = begin_current_label_crit_section();
+ seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
+ end_current_label_crit_section(label);
+
+ return 0;
+}
+
+static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
+{
+ struct aa_label *label;
+ struct aa_profile *profile;
+ struct label_it it;
+ int count = 1;
+
+ label = begin_current_label_crit_section();
+
+ if (label->size > 1) {
+ label_for_each(it, label, profile)
+ if (profile->ns != labels_ns(label)) {
+ count++;
+ break;
+ }
+ }
+
+ seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
+ end_current_label_crit_section(label);
+
+ return 0;
+}
+
+static int seq_ns_level_show(struct seq_file *seq, void *v)
+{
+ struct aa_label *label;
+
+ label = begin_current_label_crit_section();
+ seq_printf(seq, "%d\n", labels_ns(label)->level);
+ end_current_label_crit_section(label);
+
+ return 0;
+}
+
+static int seq_ns_name_show(struct seq_file *seq, void *v)
+{
+ struct aa_label *label = begin_current_label_crit_section();
+ seq_printf(seq, "%s\n", labels_ns(label)->base.name);
+ end_current_label_crit_section(label);
+
+ return 0;
+}
+
+SEQ_NS_FOPS(stacked);
+SEQ_NS_FOPS(nsstacked);
+SEQ_NS_FOPS(level);
+SEQ_NS_FOPS(name);
+
+
+/* policy/raw_data/ * file ops */
+
+#define SEQ_RAWDATA_FOPS(NAME) \
+static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
+{ \
+ return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
+} \
+ \
+static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
+ .owner = THIS_MODULE, \
+ .open = seq_rawdata_ ##NAME ##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = seq_rawdata_release, \
+} \
+
+static int seq_rawdata_open(struct inode *inode, struct file *file,
+ int (*show)(struct seq_file *, void *))
+{
+ struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
+ int error;
+
+ if (!data)
+ /* lost race this ent is being reaped */
+ return -ENOENT;
+
+ error = single_open(file, show, data);
+ if (error) {
+ AA_BUG(file->private_data &&
+ ((struct seq_file *)file->private_data)->private);
+ aa_put_loaddata(data);
+ }
+
+ return error;
+}
+
+static int seq_rawdata_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *) file->private_data;
+
+ if (seq)
+ aa_put_loaddata(seq->private);
+
+ return single_release(inode, file);
+}
+
+static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
+{
+ struct aa_loaddata *data = seq->private;
+
+ seq_printf(seq, "v%d\n", data->abi);
+
+ return 0;
+}
+
+static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
+{
+ struct aa_loaddata *data = seq->private;
+
+ seq_printf(seq, "%ld\n", data->revision);
+
+ return 0;
+}
+
+static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
+{
+ struct aa_loaddata *data = seq->private;
+ unsigned int i, size = aa_hash_size();
+
+ if (data->hash) {
+ for (i = 0; i < size; i++)
+ seq_printf(seq, "%.2x", data->hash[i]);
+ seq_putc(seq, '\n');
+ }
+
+ return 0;
+}
+
+SEQ_RAWDATA_FOPS(abi);
+SEQ_RAWDATA_FOPS(revision);
+SEQ_RAWDATA_FOPS(hash);
+
+static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
+ loff_t *ppos)
+{
+ struct aa_loaddata *rawdata = file->private_data;
+
+ return simple_read_from_buffer(buf, size, ppos, rawdata->data,
+ rawdata->size);
+}
+
+static int rawdata_release(struct inode *inode, struct file *file)
+{
+ aa_put_loaddata(file->private_data);
+
+ return 0;
+}
+
+static int rawdata_open(struct inode *inode, struct file *file)
+{
+ if (!policy_view_capable(NULL))
+ return -EACCES;
+ file->private_data = __aa_get_loaddata(inode->i_private);
+ if (!file->private_data)
+ /* lost race: this entry is being reaped */
+ return -ENOENT;
+
+ return 0;
+}
+
+static const struct file_operations rawdata_fops = {
+ .open = rawdata_open,
+ .read = rawdata_read,
+ .llseek = generic_file_llseek,
+ .release = rawdata_release,
+};
+
+static void remove_rawdata_dents(struct aa_loaddata *rawdata)
+{
+ int i;
+
+ for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
+ if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
+ /* no refcounts on i_private */
+ aafs_remove(rawdata->dents[i]);
+ rawdata->dents[i] = NULL;
+ }
+ }
+}
+
+void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
+{
+ AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
+
+ if (rawdata->ns) {
+ remove_rawdata_dents(rawdata);
+ list_del_init(&rawdata->list);
+ aa_put_ns(rawdata->ns);
+ rawdata->ns = NULL;
+ }
+}
+
+int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
+{
+ struct dentry *dent, *dir;
+
+ AA_BUG(!ns);
+ AA_BUG(!rawdata);
+ AA_BUG(!mutex_is_locked(&ns->lock));
+ AA_BUG(!ns_subdata_dir(ns));
+
+ /*
+ * just use ns revision dir was originally created at. This is
+ * under ns->lock and if load is successful revision will be
+ * bumped and is guaranteed to be unique
+ */
+ rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
+ if (!rawdata->name)
+ return -ENOMEM;
+
+ dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
+ if (IS_ERR(dir))
+ /* ->name freed when rawdata freed */
+ return PTR_ERR(dir);
+ rawdata->dents[AAFS_LOADDATA_DIR] = dir;
+
+ dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
+ &seq_rawdata_abi_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_ABI] = dent;
+
+ dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
+ &seq_rawdata_revision_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
+
+ if (aa_g_hash_policy) {
+ dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
+ rawdata, &seq_rawdata_hash_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_HASH] = dent;
+ }
+
+ dent = aafs_create_file("raw_data", S_IFREG | 0444,
+ dir, rawdata, &rawdata_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_DATA] = dent;
+ d_inode(dent)->i_size = rawdata->size;
+
+ rawdata->ns = aa_get_ns(ns);
+ list_add(&rawdata->list, &ns->rawdata_list);
+ /* no refcount on inode rawdata */
+
+ return 0;
+
+fail:
+ remove_rawdata_dents(rawdata);
+
+ return PTR_ERR(dent);
+}
+
+/** fns to setup dynamic per profile/namespace files **/
+
+/**
+ *
+ * Requires: @profile->ns->lock held
+ */
+void __aafs_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)
+ __aafs_profile_rmdir(child);
+
+ for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
+ struct aa_proxy *proxy;
+ if (!profile->dents[i])
+ continue;
+
+ proxy = d_inode(profile->dents[i])->i_private;
+ aafs_remove(profile->dents[i]);
+ aa_put_proxy(proxy);
+ profile->dents[i] = NULL;
+ }
+}
+
+/**
+ *
+ * Requires: @old->ns->lock held
+ */
+void __aafs_profile_migrate_dents(struct aa_profile *old,
+ struct aa_profile *new)
+{
+ int i;
+
+ AA_BUG(!old);
+ AA_BUG(!new);
+ AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
+
+ for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
+ new->dents[i] = old->dents[i];
+ if (new->dents[i])
+ new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
+ 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_proxy *proxy = aa_get_proxy(profile->label.proxy);
+ struct dentry *dent;
+
+ dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
+ if (IS_ERR(dent))
+ aa_put_proxy(proxy);
+
+ return dent;
+}
+
+static int profile_depth(struct aa_profile *profile)
+{
+ int depth = 0;
+
+ rcu_read_lock();
+ for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
+ depth++;
+ rcu_read_unlock();
+
+ return depth;
+}
+
+static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
+{
+ char *buffer, *s;
+ int error;
+ int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
+
+ s = buffer = kmalloc(size, GFP_KERNEL);
+ if (!buffer)
+ return ERR_PTR(-ENOMEM);
+
+ for (; depth > 0; depth--) {
+ strcpy(s, "../../");
+ s += 6;
+ size -= 6;
+ }
+
+ error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
+ if (error >= size || error < 0) {
+ kfree(buffer);
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+
+ return buffer;
+}
+
+static void rawdata_link_cb(void *arg)
+{
+ kfree(arg);
+}
+
+static const char *rawdata_get_link_base(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done,
+ const char *name)
+{
+ struct aa_proxy *proxy = inode->i_private;
+ struct aa_label *label;
+ struct aa_profile *profile;
+ char *target;
+ int depth;
+
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
+ label = aa_get_label_rcu(&proxy->label);
+ profile = labels_profile(label);
+ depth = profile_depth(profile);
+ target = gen_symlink_name(depth, profile->rawdata->name, name);
+ aa_put_label(label);
+
+ if (IS_ERR(target))
+ return target;
+
+ set_delayed_call(done, rawdata_link_cb, target);
+
+ return target;
+}
+
+static const char *rawdata_get_link_sha1(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return rawdata_get_link_base(dentry, inode, done, "sha1");
+}
+
+static const char *rawdata_get_link_abi(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return rawdata_get_link_base(dentry, inode, done, "abi");
+}
+
+static const char *rawdata_get_link_data(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return rawdata_get_link_base(dentry, inode, done, "raw_data");
+}
+
+static const struct inode_operations rawdata_link_sha1_iops = {
+ .get_link = rawdata_get_link_sha1,
+};
+
+static const struct inode_operations rawdata_link_abi_iops = {
+ .get_link = rawdata_get_link_abi,
+};
+static const struct inode_operations rawdata_link_data_iops = {
+ .get_link = rawdata_get_link_data,
+};
+
+
+/*
+ * Requires: @profile->ns->lock held
+ */
+int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
+{
+ struct aa_profile *child;
+ struct dentry *dent = NULL, *dir;
+ int error;
+
+ AA_BUG(!profile);
+ AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
+
+ 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 = aafs_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) {
+ error = -ENOMEM;
+ goto fail2;
+ }
+
+ mangle_name(profile->base.name, profile->dirname);
+ sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
+ }
+
+ dent = aafs_create_dir(profile->dirname, parent);
+ if (IS_ERR(dent))
+ goto fail;
+ prof_dir(profile) = dir = dent;
+
+ dent = create_profile_file(dir, "name", profile,
+ &seq_profile_name_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_NAME] = dent;
+
+ dent = create_profile_file(dir, "mode", profile,
+ &seq_profile_mode_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_MODE] = dent;
+
+ dent = create_profile_file(dir, "attach", profile,
+ &seq_profile_attach_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_ATTACH] = dent;
+
+ if (profile->hash) {
+ dent = create_profile_file(dir, "sha1", profile,
+ &seq_profile_hash_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_HASH] = dent;
+ }
+
+ if (profile->rawdata) {
+ dent = aafs_create_symlink("raw_sha1", dir, NULL,
+ profile->label.proxy,
+ &rawdata_link_sha1_iops);
+ if (IS_ERR(dent))
+ goto fail;
+ aa_get_proxy(profile->label.proxy);
+ profile->dents[AAFS_PROF_RAW_HASH] = dent;
+
+ dent = aafs_create_symlink("raw_abi", dir, NULL,
+ profile->label.proxy,
+ &rawdata_link_abi_iops);
+ if (IS_ERR(dent))
+ goto fail;
+ aa_get_proxy(profile->label.proxy);
+ profile->dents[AAFS_PROF_RAW_ABI] = dent;
+
+ dent = aafs_create_symlink("raw_data", dir, NULL,
+ profile->label.proxy,
+ &rawdata_link_data_iops);
+ if (IS_ERR(dent))
+ goto fail;
+ aa_get_proxy(profile->label.proxy);
+ profile->dents[AAFS_PROF_RAW_DATA] = dent;
+ }
+
+ list_for_each_entry(child, &profile->base.profiles, base.list) {
+ error = __aafs_profile_mkdir(child, prof_child_dir(profile));
+ if (error)
+ goto fail2;
+ }
+
+ return 0;
+
+fail:
+ error = PTR_ERR(dent);
+
+fail2:
+ __aafs_profile_rmdir(profile);
+
+ return error;
+}
+
+static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct aa_ns *ns, *parent;
+ /* TODO: improve permission check */
+ struct aa_label *label;
+ int error;
+
+ label = begin_current_label_crit_section();
+ error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
+ end_current_label_crit_section(label);
+ if (error)
+ return error;
+
+ parent = aa_get_ns(dir->i_private);
+ AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
+
+ /* we have to unlock and then relock to get locking order right
+ * for pin_fs
+ */
+ inode_unlock(dir);
+ error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
+ mutex_lock_nested(&parent->lock, parent->level);
+ inode_lock_nested(dir, I_MUTEX_PARENT);
+ if (error)
+ goto out;
+
+ error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
+ NULL, NULL, NULL);
+ if (error)
+ goto out_pin;
+
+ ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
+ dentry);
+ if (IS_ERR(ns)) {
+ error = PTR_ERR(ns);
+ ns = NULL;
+ }
+
+ aa_put_ns(ns); /* list ref remains */
+out_pin:
+ if (error)
+ simple_release_fs(&aafs_mnt, &aafs_count);
+out:
+ mutex_unlock(&parent->lock);
+ aa_put_ns(parent);
+
+ return error;
+}
+
+static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
+{
+ struct aa_ns *ns, *parent;
+ /* TODO: improve permission check */
+ struct aa_label *label;
+ int error;
+
+ label = begin_current_label_crit_section();
+ error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
+ end_current_label_crit_section(label);
+ if (error)
+ return error;
+
+ parent = aa_get_ns(dir->i_private);
+ /* rmdir calls the generic securityfs functions to remove files
+ * from the apparmor dir. It is up to the apparmor ns locking
+ * to avoid races.
+ */
+ inode_unlock(dir);
+ inode_unlock(dentry->d_inode);
+
+ mutex_lock_nested(&parent->lock, parent->level);
+ ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
+ dentry->d_name.len));
+ if (!ns) {
+ error = -ENOENT;
+ goto out;
+ }
+ AA_BUG(ns_dir(ns) != dentry);
+
+ __aa_remove_ns(ns);
+ aa_put_ns(ns);
+
+out:
+ mutex_unlock(&parent->lock);
+ inode_lock_nested(dir, I_MUTEX_PARENT);
+ inode_lock(dentry->d_inode);
+ aa_put_ns(parent);
+
+ return error;
+}
+
+static const struct inode_operations ns_dir_inode_operations = {
+ .lookup = simple_lookup,
+ .mkdir = ns_mkdir_op,
+ .rmdir = ns_rmdir_op,
+};
+
+static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
+{
+ struct aa_loaddata *ent, *tmp;
+
+ AA_BUG(!mutex_is_locked(&ns->lock));
+
+ list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
+ __aa_fs_remove_rawdata(ent);
+}
+
+/**
+ *
+ * Requires: @ns->lock held
+ */
+void __aafs_ns_rmdir(struct aa_ns *ns)
+{
+ struct aa_ns *sub;
+ struct aa_profile *child;
+ int i;
+
+ if (!ns)
+ return;
+ AA_BUG(!mutex_is_locked(&ns->lock));
+
+ list_for_each_entry(child, &ns->base.profiles, base.list)
+ __aafs_profile_rmdir(child);
+
+ list_for_each_entry(sub, &ns->sub_ns, base.list) {
+ mutex_lock_nested(&sub->lock, sub->level);
+ __aafs_ns_rmdir(sub);
+ mutex_unlock(&sub->lock);
+ }
+
+ __aa_fs_list_remove_rawdata(ns);
+
+ if (ns_subns_dir(ns)) {
+ sub = d_inode(ns_subns_dir(ns))->i_private;
+ aa_put_ns(sub);
+ }
+ if (ns_subload(ns)) {
+ sub = d_inode(ns_subload(ns))->i_private;
+ aa_put_ns(sub);
+ }
+ if (ns_subreplace(ns)) {
+ sub = d_inode(ns_subreplace(ns))->i_private;
+ aa_put_ns(sub);
+ }
+ if (ns_subremove(ns)) {
+ sub = d_inode(ns_subremove(ns))->i_private;
+ aa_put_ns(sub);
+ }
+ if (ns_subrevision(ns)) {
+ sub = d_inode(ns_subrevision(ns))->i_private;
+ aa_put_ns(sub);
+ }
+
+ for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
+ aafs_remove(ns->dents[i]);
+ ns->dents[i] = NULL;
+ }
+}
+
+/* assumes cleanup in caller */
+static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
+{
+ struct dentry *dent;
+
+ AA_BUG(!ns);
+ AA_BUG(!dir);
+
+ dent = aafs_create_dir("profiles", dir);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ ns_subprofs_dir(ns) = dent;
+
+ dent = aafs_create_dir("raw_data", dir);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ ns_subdata_dir(ns) = dent;
+
+ dent = aafs_create_file("revision", 0444, dir, ns,
+ &aa_fs_ns_revision_fops);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ aa_get_ns(ns);
+ ns_subrevision(ns) = dent;
+
+ dent = aafs_create_file(".load", 0640, dir, ns,
+ &aa_fs_profile_load);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ aa_get_ns(ns);
+ ns_subload(ns) = dent;
+
+ dent = aafs_create_file(".replace", 0640, dir, ns,
+ &aa_fs_profile_replace);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ aa_get_ns(ns);
+ ns_subreplace(ns) = dent;
+
+ dent = aafs_create_file(".remove", 0640, dir, ns,
+ &aa_fs_profile_remove);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ aa_get_ns(ns);
+ ns_subremove(ns) = dent;
+
+ /* use create_dentry so we can supply private data */
+ dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
+ &ns_dir_inode_operations);
+ if (IS_ERR(dent))
+ return PTR_ERR(dent);
+ aa_get_ns(ns);
+ ns_subns_dir(ns) = dent;
+
+ return 0;
+}
+
+/*
+ * Requires: @ns->lock held
+ */
+int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
+ struct dentry *dent)
+{
+ struct aa_ns *sub;
+ struct aa_profile *child;
+ struct dentry *dir;
+ int error;
+
+ AA_BUG(!ns);
+ AA_BUG(!parent);
+ AA_BUG(!mutex_is_locked(&ns->lock));
+
+ if (!name)
+ name = ns->base.name;
+
+ if (!dent) {
+ /* create ns dir if it doesn't already exist */
+ dent = aafs_create_dir(name, parent);
+ if (IS_ERR(dent))
+ goto fail;
+ } else
+ dget(dent);
+ ns_dir(ns) = dir = dent;
+ error = __aafs_ns_mkdir_entries(ns, dir);
+ if (error)
+ goto fail2;
+
+ /* profiles */
+ list_for_each_entry(child, &ns->base.profiles, base.list) {
+ error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
+ if (error)
+ goto fail2;
+ }
+
+ /* subnamespaces */
+ list_for_each_entry(sub, &ns->sub_ns, base.list) {
+ mutex_lock_nested(&sub->lock, sub->level);
+ error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
+ mutex_unlock(&sub->lock);
+ if (error)
+ goto fail2;
+ }
+
+ return 0;
+
+fail:
+ error = PTR_ERR(dent);
+
+fail2:
+ __aafs_ns_rmdir(ns);
+
+ return error;
+}
+
+
+#define list_entry_is_head(pos, head, member) (&pos->member == (head))
+
+/**
+ * __next_ns - 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_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
+{
+ struct aa_ns *parent, *next;
+
+ AA_BUG(!root);
+ AA_BUG(!ns);
+ AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
+
+ /* is next namespace a child */
+ if (!list_empty(&ns->sub_ns)) {
+ next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
+ mutex_lock_nested(&next->lock, next->level);
+ return next;
+ }
+
+ /* check if the next ns is a sibling, parent, gp, .. */
+ parent = ns->parent;
+ while (ns != root) {
+ mutex_unlock(&ns->lock);
+ next = list_next_entry(ns, base.list);
+ if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
+ mutex_lock_nested(&next->lock, next->level);
+ return next;
+ }
+ 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_ns *root,
+ struct aa_ns *ns)
+{
+ AA_BUG(!root);
+ AA_BUG(ns && !mutex_is_locked(&ns->lock));
+
+ for (; ns; ns = __next_ns(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_ns *ns = p->ns;
+
+ AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
+
+ /* 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_next_entry(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_next_entry(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_ns *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_ns(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_ns *root = aa_get_current_ns();
+ loff_t l = *pos;
+ f->private = root;
+
+ /* find the first profile */
+ mutex_lock_nested(&root->lock, root->level);
+ 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_ns *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_ns *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_ns(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_ns *root = f->private;
+
+ aa_label_seq_xprint(f, root, &profile->label,
+ FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
+ seq_putc(f, '\n');
+
+ return 0;
+}
+
+static const struct seq_operations aa_sfs_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)
+{
+ if (!policy_view_capable(NULL))
+ return -EACCES;
+
+ return seq_open(file, &aa_sfs_profiles_op);
+}
+
+static int profiles_release(struct inode *inode, struct file *file)
+{
+ return seq_release(inode, file);
+}
+
+static const struct file_operations aa_sfs_profiles_fops = {
+ .open = profiles_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = profiles_release,
+};
+
+
+/** Base file system setup **/
+static struct aa_sfs_entry aa_sfs_entry_file[] = {
+ AA_SFS_FILE_STRING("mask",
+ "create read write exec append mmap_exec link lock"),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
+ AA_SFS_FILE_STRING("mask", "read trace"),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_signal[] = {
+ AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_attach[] = {
+ AA_SFS_FILE_BOOLEAN("xattr", 1),
+ { }
+};
+static struct aa_sfs_entry aa_sfs_entry_domain[] = {
+ AA_SFS_FILE_BOOLEAN("change_hat", 1),
+ AA_SFS_FILE_BOOLEAN("change_hatv", 1),
+ AA_SFS_FILE_BOOLEAN("change_onexec", 1),
+ AA_SFS_FILE_BOOLEAN("change_profile", 1),
+ AA_SFS_FILE_BOOLEAN("stack", 1),
+ AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
+ AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
+ AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
+ AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
+ AA_SFS_FILE_STRING("version", "1.2"),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_versions[] = {
+ AA_SFS_FILE_BOOLEAN("v5", 1),
+ AA_SFS_FILE_BOOLEAN("v6", 1),
+ AA_SFS_FILE_BOOLEAN("v7", 1),
+ AA_SFS_FILE_BOOLEAN("v8", 1),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_policy[] = {
+ AA_SFS_DIR("versions", aa_sfs_entry_versions),
+ AA_SFS_FILE_BOOLEAN("set_load", 1),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_mount[] = {
+ AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_ns[] = {
+ AA_SFS_FILE_BOOLEAN("profile", 1),
+ AA_SFS_FILE_BOOLEAN("pivot_root", 0),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
+ AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
+ AA_SFS_FILE_BOOLEAN("data", 1),
+ AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_query[] = {
+ AA_SFS_DIR("label", aa_sfs_entry_query_label),
+ { }
+};
+static struct aa_sfs_entry aa_sfs_entry_features[] = {
+ AA_SFS_DIR("policy", aa_sfs_entry_policy),
+ AA_SFS_DIR("domain", aa_sfs_entry_domain),
+ AA_SFS_DIR("file", aa_sfs_entry_file),
+ AA_SFS_DIR("network_v8", aa_sfs_entry_network),
+ AA_SFS_DIR("mount", aa_sfs_entry_mount),
+ AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
+ AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
+ AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
+ AA_SFS_DIR("caps", aa_sfs_entry_caps),
+ AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
+ AA_SFS_DIR("signal", aa_sfs_entry_signal),
+ AA_SFS_DIR("query", aa_sfs_entry_query),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
+ AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
+ AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
+ AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
+ AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
+ AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
+ AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
+ AA_SFS_DIR("features", aa_sfs_entry_features),
+ { }
+};
+
+static struct aa_sfs_entry aa_sfs_entry =
+ AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
+
+/**
+ * entry_create_file - create a file entry in the apparmor securityfs
+ * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use entry_remove_file to remove entries created with this fn.
+ */
+static int __init entry_create_file(struct aa_sfs_entry *fs_file,
+ struct dentry *parent)
+{
+ int error = 0;
+
+ fs_file->dentry = securityfs_create_file(fs_file->name,
+ S_IFREG | fs_file->mode,
+ parent, fs_file,
+ fs_file->file_ops);
+ if (IS_ERR(fs_file->dentry)) {
+ error = PTR_ERR(fs_file->dentry);
+ fs_file->dentry = NULL;
+ }
+ return error;
+}
+
+static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
+/**
+ * entry_create_dir - recursively create a directory entry in the securityfs
+ * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use entry_remove_dir to remove entries created with this fn.
+ */
+static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
+ struct dentry *parent)
+{
+ struct aa_sfs_entry *fs_file;
+ struct dentry *dir;
+ int error;
+
+ 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 && fs_file->name; ++fs_file) {
+ if (fs_file->v_type == AA_SFS_TYPE_DIR)
+ error = entry_create_dir(fs_file, fs_dir->dentry);
+ else
+ error = entry_create_file(fs_file, fs_dir->dentry);
+ if (error)
+ goto failed;
+ }
+
+ return 0;
+
+failed:
+ entry_remove_dir(fs_dir);
+
+ return error;
+}
+
+/**
+ * entry_remove_file - drop a single file entry in the apparmor securityfs
+ * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
+ */
+static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
+{
+ if (!fs_file->dentry)
+ return;
+
+ securityfs_remove(fs_file->dentry);
+ fs_file->dentry = NULL;
+}
+
+/**
+ * entry_remove_dir - recursively drop a directory entry from the securityfs
+ * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
+ */
+static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
+{
+ struct aa_sfs_entry *fs_file;
+
+ for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
+ if (fs_file->v_type == AA_SFS_TYPE_DIR)
+ entry_remove_dir(fs_file);
+ else
+ entry_remove_file(fs_file);
+ }
+
+ entry_remove_file(fs_dir);
+}
+
+/**
+ * aa_destroy_aafs - cleanup and free aafs
+ *
+ * releases dentries allocated by aa_create_aafs
+ */
+void __init aa_destroy_aafs(void)
+{
+ entry_remove_dir(&aa_sfs_entry);
+}
+
+
+#define NULL_FILE_NAME ".null"
+struct path aa_null;
+
+static int aa_mk_null_file(struct dentry *parent)
+{
+ struct vfsmount *mount = NULL;
+ struct dentry *dentry;
+ struct inode *inode;
+ int count = 0;
+ int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
+
+ if (error)
+ return error;
+
+ inode_lock(d_inode(parent));
+ dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
+ if (IS_ERR(dentry)) {
+ error = PTR_ERR(dentry);
+ goto out;
+ }
+ inode = new_inode(parent->d_inode->i_sb);
+ if (!inode) {
+ error = -ENOMEM;
+ goto out1;
+ }
+
+ inode->i_ino = get_next_ino();
+ inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
+ MKDEV(MEM_MAJOR, 3));
+ d_instantiate(dentry, inode);
+ aa_null.dentry = dget(dentry);
+ aa_null.mnt = mntget(mount);
+
+ error = 0;
+
+out1:
+ dput(dentry);
+out:
+ inode_unlock(d_inode(parent));
+ simple_release_fs(&mount, &count);
+ return error;
+}
+
+
+
+static const char *policy_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ struct aa_ns *ns;
+ struct path path;
+
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+ ns = aa_get_current_ns();
+ path.mnt = mntget(aafs_mnt);
+ path.dentry = dget(ns_dir(ns));
+ nd_jump_link(&path);
+ aa_put_ns(ns);
+
+ return NULL;
+}
+
+static int policy_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ char name[32];
+ int res;
+
+ res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
+ d_inode(dentry)->i_ino);
+ if (res > 0 && res < sizeof(name))
+ res = readlink_copy(buffer, buflen, name);
+ else
+ res = -ENOENT;
+
+ return res;
+}
+
+static const struct inode_operations policy_link_iops = {
+ .readlink = policy_readlink,
+ .get_link = policy_get_link,
+};
+
+
+/**
+ * aa_create_aafs - create the apparmor security filesystem
+ *
+ * dentries created here are released by aa_destroy_aafs
+ *
+ * Returns: error on failure
+ */
+static int __init aa_create_aafs(void)
+{
+ struct dentry *dent;
+ int error;
+
+ if (!apparmor_initialized)
+ return 0;
+
+ if (aa_sfs_entry.dentry) {
+ AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
+ return -EEXIST;
+ }
+
+ /* setup apparmorfs used to virtualize policy/ */
+ aafs_mnt = kern_mount(&aafs_ops);
+ if (IS_ERR(aafs_mnt))
+ panic("can't set apparmorfs up\n");
+ aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
+
+ /* Populate fs tree. */
+ error = entry_create_dir(&aa_sfs_entry, NULL);
+ if (error)
+ goto error;
+
+ dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
+ NULL, &aa_fs_profile_load);
+ if (IS_ERR(dent))
+ goto dent_error;
+ ns_subload(root_ns) = dent;
+
+ dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
+ NULL, &aa_fs_profile_replace);
+ if (IS_ERR(dent))
+ goto dent_error;
+ ns_subreplace(root_ns) = dent;
+
+ dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
+ NULL, &aa_fs_profile_remove);
+ if (IS_ERR(dent))
+ goto dent_error;
+ ns_subremove(root_ns) = dent;
+
+ dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
+ NULL, &aa_fs_ns_revision_fops);
+ if (IS_ERR(dent))
+ goto dent_error;
+ ns_subrevision(root_ns) = dent;
+
+ /* policy tree referenced by magic policy symlink */
+ mutex_lock_nested(&root_ns->lock, root_ns->level);
+ error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
+ aafs_mnt->mnt_root);
+ mutex_unlock(&root_ns->lock);
+ if (error)
+ goto error;
+
+ /* magic symlink similar to nsfs redirects based on task policy */
+ dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
+ NULL, &policy_link_iops);
+ if (IS_ERR(dent))
+ goto dent_error;
+
+ error = aa_mk_null_file(aa_sfs_entry.dentry);
+ if (error)
+ goto error;
+
+ /* TODO: add default profile to apparmorfs */
+
+ /* Report that AppArmor fs is enabled */
+ aa_info_message("AppArmor Filesystem Enabled");
+ return 0;
+
+dent_error:
+ error = PTR_ERR(dent);
+error:
+ aa_destroy_aafs();
+ AA_ERROR("Error creating AppArmor securityfs\n");
+ return error;
+}
+
+fs_initcall(aa_create_aafs);