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authorDustin Kirkland <dustin.kirkland@us.ibm.com>2005-11-03 16:12:36 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2006-03-20 14:08:54 -0500
commitc8edc80c8b8c397c53f4f659a05b9ea6208029bf (patch)
tree0b09c0ff9ea28038b711d7368100302a1cc69b6d /kernel
parent73241ccca0f7786933f1d31b3d86f2456549953a (diff)
[PATCH] Exclude messages by message type
- Add a new, 5th filter called "exclude". - And add a new field AUDIT_MSGTYPE. - Define a new function audit_filter_exclude() that takes a message type as input and examines all rules in the filter. It returns '1' if the message is to be excluded, and '0' otherwise. - Call the audit_filter_exclude() function near the top of audit_log_start() just after asserting audit_initialized. If the message type is not to be audited, return NULL very early, before doing a lot of work. [combined with followup fix for bug in original patch, Nov 4, same author] [combined with later renaming AUDIT_FILTER_EXCLUDE->AUDIT_FILTER_TYPE and audit_filter_exclude() -> audit_filter_type()] Signed-off-by: Dustin Kirkland <dustin.kirkland@us.ibm.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/audit.c3
-rw-r--r--kernel/auditsc.c35
2 files changed, 37 insertions, 1 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 6d61dd79a60..1c3eb1b12bf 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -702,6 +702,9 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
if (!audit_initialized)
return NULL;
+ if (unlikely(audit_filter_type(type)))
+ return NULL;
+
if (gfp_mask & __GFP_WAIT)
reserve = 0;
else
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 73f932b7deb..31917ac730a 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -187,7 +187,8 @@ static struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
LIST_HEAD_INIT(audit_filter_list[2]),
LIST_HEAD_INIT(audit_filter_list[3]),
LIST_HEAD_INIT(audit_filter_list[4]),
-#if AUDIT_NR_FILTERS != 5
+ LIST_HEAD_INIT(audit_filter_list[5]),
+#if AUDIT_NR_FILTERS != 6
#error Fix audit_filter_list initialiser
#endif
};
@@ -663,6 +664,38 @@ int audit_filter_user(struct netlink_skb_parms *cb, int type)
return ret; /* Audit by default */
}
+int audit_filter_type(int type)
+{
+ struct audit_entry *e;
+ int result = 0;
+
+ rcu_read_lock();
+ if (list_empty(&audit_filter_list[AUDIT_FILTER_TYPE]))
+ goto unlock_and_return;
+
+ list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TYPE],
+ list) {
+ struct audit_rule *rule = &e->rule;
+ int i;
+ for (i = 0; i < rule->field_count; i++) {
+ u32 field = rule->fields[i] & ~AUDIT_OPERATORS;
+ u32 op = rule->fields[i] & AUDIT_OPERATORS;
+ u32 value = rule->values[i];
+ if ( field == AUDIT_MSGTYPE ) {
+ result = audit_comparator(type, op, value);
+ if (!result)
+ break;
+ }
+ }
+ if (result)
+ goto unlock_and_return;
+ }
+unlock_and_return:
+ rcu_read_unlock();
+ return result;
+}
+
+
/* This should be called with task_lock() held. */
static inline struct audit_context *audit_get_context(struct task_struct *tsk,
int return_valid,