forked from Minki/linux
apparmor: add the profile introspection file to interface
Add the dynamic namespace relative profiles file to the interace, to allow introspection of loaded profiles and their modes. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <kees@ubuntu.com>
This commit is contained in:
John Johansen
parent
556d0be74b
commit
29b3822f1e
@ -20,6 +20,7 @@
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#include <linux/uaccess.h>
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#include <linux/namei.h>
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#include <linux/capability.h>
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#include <linux/rcupdate.h>
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#include "include/apparmor.h"
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#include "include/apparmorfs.h"
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@ -512,6 +513,240 @@ fail2:
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}
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#define list_entry_next(pos, member) \
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list_entry(pos->member.next, typeof(*pos), member)
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#define list_entry_is_head(pos, head, member) (&pos->member == (head))
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/**
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* __next_namespace - find the next namespace to list
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* @root: root namespace to stop search at (NOT NULL)
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* @ns: current ns position (NOT NULL)
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*
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* Find the next namespace from @ns under @root and handle all locking needed
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* while switching current namespace.
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*
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* Returns: next namespace or NULL if at last namespace under @root
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* Requires: ns->parent->lock to be held
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* NOTE: will not unlock root->lock
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*/
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static struct aa_namespace *__next_namespace(struct aa_namespace *root,
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struct aa_namespace *ns)
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{
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struct aa_namespace *parent, *next;
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/* is next namespace a child */
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if (!list_empty(&ns->sub_ns)) {
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next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
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mutex_lock(&next->lock);
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return next;
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}
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/* check if the next ns is a sibling, parent, gp, .. */
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parent = ns->parent;
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while (parent) {
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mutex_unlock(&ns->lock);
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next = list_entry_next(ns, base.list);
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if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
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mutex_lock(&next->lock);
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return next;
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}
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if (parent == root)
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return NULL;
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ns = parent;
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parent = parent->parent;
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}
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return NULL;
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}
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/**
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* __first_profile - find the first profile in a namespace
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* @root: namespace that is root of profiles being displayed (NOT NULL)
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* @ns: namespace to start in (NOT NULL)
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*
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* Returns: unrefcounted profile or NULL if no profile
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* Requires: profile->ns.lock to be held
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*/
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static struct aa_profile *__first_profile(struct aa_namespace *root,
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struct aa_namespace *ns)
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{
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for (; ns; ns = __next_namespace(root, ns)) {
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if (!list_empty(&ns->base.profiles))
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return list_first_entry(&ns->base.profiles,
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struct aa_profile, base.list);
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}
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return NULL;
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}
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/**
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* __next_profile - step to the next profile in a profile tree
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* @profile: current profile in tree (NOT NULL)
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*
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* Perform a depth first traversal on the profile tree in a namespace
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*
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* Returns: next profile or NULL if done
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* Requires: profile->ns.lock to be held
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*/
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static struct aa_profile *__next_profile(struct aa_profile *p)
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{
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struct aa_profile *parent;
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struct aa_namespace *ns = p->ns;
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/* is next profile a child */
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if (!list_empty(&p->base.profiles))
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return list_first_entry(&p->base.profiles, typeof(*p),
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base.list);
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/* is next profile a sibling, parent sibling, gp, sibling, .. */
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parent = rcu_dereference_protected(p->parent,
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mutex_is_locked(&p->ns->lock));
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while (parent) {
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p = list_entry_next(p, base.list);
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if (!list_entry_is_head(p, &parent->base.profiles, base.list))
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return p;
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p = parent;
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parent = rcu_dereference_protected(parent->parent,
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mutex_is_locked(&parent->ns->lock));
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}
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/* is next another profile in the namespace */
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p = list_entry_next(p, base.list);
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if (!list_entry_is_head(p, &ns->base.profiles, base.list))
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return p;
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return NULL;
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}
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/**
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* next_profile - step to the next profile in where ever it may be
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* @root: root namespace (NOT NULL)
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* @profile: current profile (NOT NULL)
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*
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* Returns: next profile or NULL if there isn't one
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*/
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static struct aa_profile *next_profile(struct aa_namespace *root,
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struct aa_profile *profile)
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{
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struct aa_profile *next = __next_profile(profile);
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if (next)
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return next;
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/* finished all profiles in namespace move to next namespace */
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return __first_profile(root, __next_namespace(root, profile->ns));
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}
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/**
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* p_start - start a depth first traversal of profile tree
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* @f: seq_file to fill
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* @pos: current position
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*
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* Returns: first profile under current namespace or NULL if none found
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*
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* acquires first ns->lock
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*/
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static void *p_start(struct seq_file *f, loff_t *pos)
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{
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struct aa_profile *profile = NULL;
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struct aa_namespace *root = aa_current_profile()->ns;
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loff_t l = *pos;
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f->private = aa_get_namespace(root);
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/* find the first profile */
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mutex_lock(&root->lock);
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profile = __first_profile(root, root);
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/* skip to position */
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for (; profile && l > 0; l--)
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profile = next_profile(root, profile);
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return profile;
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}
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/**
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* p_next - read the next profile entry
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* @f: seq_file to fill
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* @p: profile previously returned
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* @pos: current position
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*
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* Returns: next profile after @p or NULL if none
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*
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* may acquire/release locks in namespace tree as necessary
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*/
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static void *p_next(struct seq_file *f, void *p, loff_t *pos)
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{
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struct aa_profile *profile = p;
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struct aa_namespace *ns = f->private;
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(*pos)++;
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return next_profile(ns, profile);
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}
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/**
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* p_stop - stop depth first traversal
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* @f: seq_file we are filling
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* @p: the last profile writen
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*
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* Release all locking done by p_start/p_next on namespace tree
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*/
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static void p_stop(struct seq_file *f, void *p)
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{
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struct aa_profile *profile = p;
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struct aa_namespace *root = f->private, *ns;
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if (profile) {
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for (ns = profile->ns; ns && ns != root; ns = ns->parent)
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mutex_unlock(&ns->lock);
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}
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mutex_unlock(&root->lock);
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aa_put_namespace(root);
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}
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/**
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* seq_show_profile - show a profile entry
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* @f: seq_file to file
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* @p: current position (profile) (NOT NULL)
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*
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* Returns: error on failure
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*/
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static int seq_show_profile(struct seq_file *f, void *p)
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{
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struct aa_profile *profile = (struct aa_profile *)p;
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struct aa_namespace *root = f->private;
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if (profile->ns != root)
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seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
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seq_printf(f, "%s (%s)\n", profile->base.hname,
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aa_profile_mode_names[profile->mode]);
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return 0;
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}
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static const struct seq_operations aa_fs_profiles_op = {
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.start = p_start,
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.next = p_next,
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.stop = p_stop,
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.show = seq_show_profile,
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};
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static int profiles_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &aa_fs_profiles_op);
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}
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static int profiles_release(struct inode *inode, struct file *file)
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{
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return seq_release(inode, file);
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}
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static const struct file_operations aa_fs_profiles_fops = {
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.open = profiles_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = profiles_release,
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};
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/** Base file system setup **/
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static struct aa_fs_entry aa_fs_entry_file[] = {
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AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
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@ -545,6 +780,7 @@ static struct aa_fs_entry aa_fs_entry_apparmor[] = {
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AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
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AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
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AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
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AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
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AA_FS_DIR("features", aa_fs_entry_features),
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{ }
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};
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