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authorAl Viro <viro@zeniv.linux.org.uk>2008-12-14 23:45:27 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-01-04 15:14:41 -0500
commit0590b9335a1c72a3f0defcc6231287f7817e07c8 (patch)
tree289fa4668ae304f79f7484ac31b2cab0ab8894c1 /kernel/auditfilter.c
parent1a9d0797b8977d413435277bf9661efbbd584693 (diff)
fixing audit rule ordering mess, part 1
Problem: ordering between the rules on exit chain is currently lost; all watch and inode rules are listed after everything else _and_ exit,never on one kind doesn't stop exit,always on another from being matched. Solution: assign priorities to rules, keep track of the current highest-priority matching rule and its result (always/never). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/auditfilter.c')
-rw-r--r--kernel/auditfilter.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 0febaa0f784..995a2e86808 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -919,6 +919,7 @@ static struct audit_entry *audit_dupe_rule(struct audit_krule *old,
new->action = old->action;
for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
new->mask[i] = old->mask[i];
+ new->prio = old->prio;
new->buflen = old->buflen;
new->inode_f = old->inode_f;
new->watch = NULL;
@@ -987,9 +988,8 @@ static void audit_update_watch(struct audit_parent *parent,
/* If the update involves invalidating rules, do the inode-based
* filtering now, so we don't omit records. */
- if (invalidating && current->audit_context &&
- audit_filter_inodes(current, current->audit_context) == AUDIT_RECORD_CONTEXT)
- audit_set_auditable(current->audit_context);
+ if (invalidating && current->audit_context)
+ audit_filter_inodes(current, current->audit_context);
nwatch = audit_dupe_watch(owatch);
if (IS_ERR(nwatch)) {
@@ -1258,6 +1258,9 @@ static int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
return ret;
}
+static u64 prio_low = ~0ULL/2;
+static u64 prio_high = ~0ULL/2 - 1;
+
/* Add rule to given filterlist if not a duplicate. */
static inline int audit_add_rule(struct audit_entry *entry,
struct list_head *list)
@@ -1319,6 +1322,14 @@ static inline int audit_add_rule(struct audit_entry *entry,
}
}
+ entry->rule.prio = ~0ULL;
+ if (entry->rule.listnr == AUDIT_FILTER_EXIT) {
+ if (entry->rule.flags & AUDIT_FILTER_PREPEND)
+ entry->rule.prio = ++prio_high;
+ else
+ entry->rule.prio = --prio_low;
+ }
+
if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
list_add_rcu(&entry->list, list);
entry->rule.flags &= ~AUDIT_FILTER_PREPEND;