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Audit: clean up the audit_watch split 

No real changes, just cleanup to the audit_watch split patch which we done
with minimal code changes for easy review.  Now fix interfaces to make
things work better.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 20:12:04 -05:00
parent b7ba837153
commit ae7b8f4108
5 changed files with 60 additions and 67 deletions
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1
kernel/audit.c
View File

@ -56,7 +56,6 @@
#include <net/netlink.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/inotify.h>
#include <linux/freezer.h>
#include <linux/tty.h>

13
kernel/audit.h
View File

@ -104,20 +104,15 @@ extern void audit_free_rule_rcu(struct rcu_head *);
extern struct list_head audit_filter_list[];
/* audit watch functions */
extern unsigned long audit_watch_inode(struct audit_watch *watch);
extern dev_t audit_watch_dev(struct audit_watch *watch);
extern void audit_put_watch(struct audit_watch *watch);
extern void audit_get_watch(struct audit_watch *watch);
extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
extern int audit_add_watch(struct audit_krule *krule);
extern void audit_remove_watch(struct audit_watch *watch);
extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
extern void audit_inotify_unregister(struct list_head *in_list);
extern void audit_watch_inotify_unregister(struct list_head *in_list);
extern char *audit_watch_path(struct audit_watch *watch);
extern struct list_head *audit_watch_rules(struct audit_watch *watch);
extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch *watch);
extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
#ifdef CONFIG_AUDIT_TREE
extern struct audit_chunk *audit_tree_lookup(const struct inode *);

67
kernel/audit_watch.c
View File

@ -51,12 +51,12 @@ struct audit_watch {
unsigned long ino; /* associated inode number */
struct audit_parent *parent; /* associated parent */
struct list_head wlist; /* entry in parent->watches list */
struct list_head rules; /* associated rules */
struct list_head rules; /* anchor for krule->rlist */
};
struct audit_parent {
struct list_head ilist; /* entry in inotify registration list */
struct list_head watches; /* associated watches */
struct list_head ilist; /* tmp list used to free parents */
struct list_head watches; /* anchor for audit_watch->wlist */
struct inotify_watch wdata; /* inotify watch data */
unsigned flags; /* status flags */
};
@ -78,13 +78,18 @@ struct inotify_handle *audit_ih;
/* Inotify events we care about. */
#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
static void audit_free_parent(struct inotify_watch *i_watch)
static void audit_free_parent(struct audit_parent *parent)
{
WARN_ON(!list_empty(&parent->watches));
kfree(parent);
}
static void audit_destroy_watch(struct inotify_watch *i_watch)
{
struct audit_parent *parent;
parent = container_of(i_watch, struct audit_parent, wdata);
WARN_ON(!list_empty(&parent->watches));
kfree(parent);
audit_free_parent(parent);
}
void audit_get_watch(struct audit_watch *watch)
@ -115,19 +120,11 @@ char *audit_watch_path(struct audit_watch *watch)
return watch->path;
}
struct list_head *audit_watch_rules(struct audit_watch *watch)
int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
{
return &watch->rules;
}
unsigned long audit_watch_inode(struct audit_watch *watch)
{
return watch->ino;
}
dev_t audit_watch_dev(struct audit_watch *watch)
{
return watch->dev;
return (watch->ino != (unsigned long)-1) &&
(watch->ino == ino) &&
(watch->dev == dev);
}
/* Initialize a parent watch entry. */
@ -149,7 +146,7 @@ static struct audit_parent *audit_init_parent(struct nameidata *ndp)
wd = inotify_add_watch(audit_ih, &parent->wdata,
ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
if (wd < 0) {
audit_free_parent(&parent->wdata);
audit_free_parent(parent);
return ERR_PTR(wd);
}
@ -251,15 +248,19 @@ static void audit_update_watch(struct audit_parent *parent,
struct audit_entry *oentry, *nentry;
mutex_lock(&audit_filter_mutex);
/* Run all of the watches on this parent looking for the one that
* matches the given dname */
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
if (audit_compare_dname_path(dname, owatch->path, NULL))
continue;
/* If the update involves invalidating rules, do the inode-based
* filtering now, so we don't omit records. */
if (invalidating && current->audit_context)
if (invalidating && !audit_dummy_context())
audit_filter_inodes(current, current->audit_context);
/* updating ino will likely change which audit_hash_list we
* are on so we need a new watch for the new list */
nwatch = audit_dupe_watch(owatch);
if (IS_ERR(nwatch)) {
mutex_unlock(&audit_filter_mutex);
@ -275,12 +276,21 @@ static void audit_update_watch(struct audit_parent *parent,
list_del(&oentry->rule.rlist);
list_del_rcu(&oentry->list);
nentry = audit_dupe_rule(&oentry->rule, nwatch);
nentry = audit_dupe_rule(&oentry->rule);
if (IS_ERR(nentry)) {
list_del(&oentry->rule.list);
audit_panic("error updating watch, removing");
} else {
int h = audit_hash_ino((u32)ino);
/*
* nentry->rule.watch == oentry->rule.watch so
* we must drop that reference and set it to our
* new watch.
*/
audit_put_watch(nentry->rule.watch);
audit_get_watch(nwatch);
nentry->rule.watch = nwatch;
list_add(&nentry->rule.rlist, &nwatch->rules);
list_add_rcu(&nentry->list, &audit_inode_hash[h]);
list_replace(&oentry->rule.list,
@ -329,14 +339,14 @@ static void audit_remove_parent_watches(struct audit_parent *parent)
/* Unregister inotify watches for parents on in_list.
* Generates an IN_IGNORED event. */
void audit_inotify_unregister(struct list_head *in_list)
void audit_watch_inotify_unregister(struct list_head *in_list)
{
struct audit_parent *p, *n;
list_for_each_entry_safe(p, n, in_list, ilist) {
list_del(&p->ilist);
inotify_rm_watch(audit_ih, &p->wdata);
/* the unpin matching the pin in audit_do_del_rule() */
/* the unpin matching the pin in audit_remove_watch_rule() */
unpin_inotify_watch(&p->wdata);
}
}
@ -423,13 +433,13 @@ static void audit_add_to_parent(struct audit_krule *krule,
/* Find a matching watch entry, or add this one.
* Caller must hold audit_filter_mutex. */
int audit_add_watch(struct audit_krule *krule)
int audit_add_watch(struct audit_krule *krule, struct list_head **list)
{
struct audit_watch *watch = krule->watch;
struct inotify_watch *i_watch;
struct audit_parent *parent;
struct nameidata *ndp = NULL, *ndw = NULL;
int ret = 0;
int h, ret = 0;
mutex_unlock(&audit_filter_mutex);
@ -475,6 +485,8 @@ int audit_add_watch(struct audit_krule *krule)
/* match get in audit_init_parent or inotify_find_watch */
put_inotify_watch(&parent->wdata);
h = audit_hash_ino((u32)watch->ino);
*list = &audit_inode_hash[h];
error:
audit_put_nd(ndp, ndw); /* NULL args OK */
return ret;
@ -514,8 +526,7 @@ static void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
parent = container_of(i_watch, struct audit_parent, wdata);
if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
audit_update_watch(parent, dname, inode->i_sb->s_dev,
inode->i_ino, 0);
audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
else if (mask & (IN_DELETE|IN_MOVED_FROM))
audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
/* inotify automatically removes the watch and sends IN_IGNORED */
@ -531,7 +542,7 @@ static void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
static const struct inotify_operations audit_inotify_ops = {
.handle_event = audit_handle_ievent,
.destroy_watch = audit_free_parent,
.destroy_watch = audit_destroy_watch,
};
static int __init audit_watch_init(void)

41
kernel/auditfilter.c
View File

@ -71,6 +71,7 @@ static inline void audit_free_rule(struct audit_entry *e)
{
int i;
struct audit_krule *erule = &e->rule;
/* some rules don't have associated watches */
if (erule->watch)
audit_put_watch(erule->watch);
@ -746,8 +747,7 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
* rule with the new rule in the filterlist, then free the old rule.
* The rlist element is undefined; list manipulations are handled apart from
* the initial copy. */
struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch *watch)
struct audit_entry *audit_dupe_rule(struct audit_krule *old)
{
u32 fcount = old->field_count;
struct audit_entry *entry;
@ -769,8 +769,8 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old,
new->prio = old->prio;
new->buflen = old->buflen;
new->inode_f = old->inode_f;
new->watch = NULL;
new->field_count = old->field_count;
/*
* note that we are OK with not refcounting here; audit_match_tree()
* never dereferences tree and we can't get false positives there
@ -811,9 +811,9 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old,
}
}
if (watch) {
audit_get_watch(watch);
new->watch = watch;
if (old->watch) {
audit_get_watch(old->watch);
new->watch = old->watch;
}
return entry;
@ -866,7 +866,7 @@ static inline int audit_add_rule(struct audit_entry *entry)
struct audit_watch *watch = entry->rule.watch;
struct audit_tree *tree = entry->rule.tree;
struct list_head *list;
int h, err;
int err;
#ifdef CONFIG_AUDITSYSCALL
int dont_count = 0;
@ -889,15 +889,11 @@ static inline int audit_add_rule(struct audit_entry *entry)
if (watch) {
/* audit_filter_mutex is dropped and re-taken during this call */
err = audit_add_watch(&entry->rule);
err = audit_add_watch(&entry->rule, &list);
if (err) {
mutex_unlock(&audit_filter_mutex);
goto error;
}
/* entry->rule.watch may have changed during audit_add_watch() */
watch = entry->rule.watch;
h = audit_hash_ino((u32)audit_watch_inode(watch));
list = &audit_inode_hash[h];
}
if (tree) {
err = audit_add_tree_rule(&entry->rule);
@ -949,7 +945,7 @@ static inline int audit_del_rule(struct audit_entry *entry)
struct audit_watch *watch = entry->rule.watch;
struct audit_tree *tree = entry->rule.tree;
struct list_head *list;
LIST_HEAD(inotify_list);
LIST_HEAD(inotify_unregister_list);
int ret = 0;
#ifdef CONFIG_AUDITSYSCALL
int dont_count = 0;
@ -969,7 +965,7 @@ static inline int audit_del_rule(struct audit_entry *entry)
}
if (e->rule.watch)
audit_remove_watch_rule(&e->rule, &inotify_list);
audit_remove_watch_rule(&e->rule, &inotify_unregister_list);
if (e->rule.tree)
audit_remove_tree_rule(&e->rule);
@ -987,8 +983,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
#endif
mutex_unlock(&audit_filter_mutex);
if (!list_empty(&inotify_list))
audit_inotify_unregister(&inotify_list);
if (!list_empty(&inotify_unregister_list))
audit_watch_inotify_unregister(&inotify_unregister_list);
out:
if (watch)
@ -1323,30 +1319,23 @@ static int update_lsm_rule(struct audit_krule *r)
{
struct audit_entry *entry = container_of(r, struct audit_entry, rule);
struct audit_entry *nentry;
struct audit_watch *watch;
struct audit_tree *tree;
int err = 0;
if (!security_audit_rule_known(r))
return 0;
watch = r->watch;
tree = r->tree;
nentry = audit_dupe_rule(r, watch);
nentry = audit_dupe_rule(r);
if (IS_ERR(nentry)) {
/* save the first error encountered for the
* return value */
err = PTR_ERR(nentry);
audit_panic("error updating LSM filters");
if (watch)
if (r->watch)
list_del(&r->rlist);
list_del_rcu(&entry->list);
list_del(&r->list);
} else {
if (watch) {
list_add(&nentry->rule.rlist, audit_watch_rules(watch));
list_del(&r->rlist);
} else if (tree)
if (r->watch || r->tree)
list_replace_init(&r->rlist, &nentry->rule.rlist);
list_replace_rcu(&entry->list, &nentry->list);
list_replace(&r->list, &nentry->rule.list);

5
kernel/auditsc.c
View File

@ -549,9 +549,8 @@ static int audit_filter_rules(struct task_struct *tsk,
}
break;
case AUDIT_WATCH:
if (name && audit_watch_inode(rule->watch) != (unsigned long)-1)
result = (name->dev == audit_watch_dev(rule->watch) &&
name->ino == audit_watch_inode(rule->watch));
if (name)
result = audit_watch_compare(rule->watch, name->ino, name->dev);
break;
case AUDIT_DIR:
if (ctx)