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-rw-r--r--kernel/audit.c191
-rw-r--r--kernel/auditfilter.c54
2 files changed, 93 insertions, 152 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 26ff925e13f2..7e29372da284 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -66,9 +66,9 @@
* (Initialization happens after skb_init is called.) */
static int audit_initialized;
-/* 0 - no auditing
- * 1 - auditing enabled
- * 2 - auditing enabled and configuration is locked/unchangeable. */
+#define AUDIT_OFF 0
+#define AUDIT_ON 1
+#define AUDIT_LOCKED 2
int audit_enabled;
/* Default state when kernel boots without any parameters. */
@@ -240,152 +240,90 @@ void audit_log_lost(const char *message)
}
}
-static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sid)
+static int audit_log_config_change(char *function_name, int new, int old,
+ uid_t loginuid, u32 sid, int allow_changes)
{
- int res, rc = 0, old = audit_rate_limit;
-
- /* check if we are locked */
- if (audit_enabled == 2)
- res = 0;
- else
- res = 1;
+ struct audit_buffer *ab;
+ int rc = 0;
+ ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+ audit_log_format(ab, "%s=%d old=%d by auid=%u", function_name, new,
+ old, loginuid);
if (sid) {
char *ctx = NULL;
u32 len;
- if ((rc = selinux_sid_to_string(sid, &ctx, &len)) == 0) {
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_rate_limit=%d old=%d by auid=%u"
- " subj=%s res=%d",
- limit, old, loginuid, ctx, res);
+
+ rc = selinux_sid_to_string(sid, &ctx, &len);
+ if (rc) {
+ audit_log_format(ab, " sid=%u", sid);
+ allow_changes = 0; /* Something weird, deny request */
+ } else {
+ audit_log_format(ab, " subj=%s", ctx);
kfree(ctx);
- } else
- res = 0; /* Something weird, deny request */
+ }
}
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_rate_limit=%d old=%d by auid=%u res=%d",
- limit, old, loginuid, res);
-
- /* If we are allowed, make the change */
- if (res == 1)
- audit_rate_limit = limit;
- /* Not allowed, update reason */
- else if (rc == 0)
- rc = -EPERM;
+ audit_log_format(ab, " res=%d", allow_changes);
+ audit_log_end(ab);
return rc;
}
-static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sid)
+static int audit_do_config_change(char *function_name, int *to_change,
+ int new, uid_t loginuid, u32 sid)
{
- int res, rc = 0, old = audit_backlog_limit;
+ int allow_changes, rc = 0, old = *to_change;
/* check if we are locked */
- if (audit_enabled == 2)
- res = 0;
+ if (audit_enabled == AUDIT_LOCKED)
+ allow_changes = 0;
else
- res = 1;
+ allow_changes = 1;
- if (sid) {
- char *ctx = NULL;
- u32 len;
- if ((rc = selinux_sid_to_string(sid, &ctx, &len)) == 0) {
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_backlog_limit=%d old=%d by auid=%u"
- " subj=%s res=%d",
- limit, old, loginuid, ctx, res);
- kfree(ctx);
- } else
- res = 0; /* Something weird, deny request */
+ if (audit_enabled != AUDIT_OFF) {
+ rc = audit_log_config_change(function_name, new, old,
+ loginuid, sid, allow_changes);
+ if (rc)
+ allow_changes = 0;
}
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_backlog_limit=%d old=%d by auid=%u res=%d",
- limit, old, loginuid, res);
/* If we are allowed, make the change */
- if (res == 1)
- audit_backlog_limit = limit;
+ if (allow_changes == 1)
+ *to_change = new;
/* Not allowed, update reason */
else if (rc == 0)
rc = -EPERM;
return rc;
}
-static int audit_set_enabled(int state, uid_t loginuid, u32 sid)
+static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sid)
{
- int res, rc = 0, old = audit_enabled;
-
- if (state < 0 || state > 2)
- return -EINVAL;
+ return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
+ limit, loginuid, sid);
+}
- /* check if we are locked */
- if (audit_enabled == 2)
- res = 0;
- else
- res = 1;
+static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sid)
+{
+ return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit,
+ limit, loginuid, sid);
+}
- if (sid) {
- char *ctx = NULL;
- u32 len;
- if ((rc = selinux_sid_to_string(sid, &ctx, &len)) == 0) {
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_enabled=%d old=%d by auid=%u"
- " subj=%s res=%d",
- state, old, loginuid, ctx, res);
- kfree(ctx);
- } else
- res = 0; /* Something weird, deny request */
- }
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_enabled=%d old=%d by auid=%u res=%d",
- state, old, loginuid, res);
+static int audit_set_enabled(int state, uid_t loginuid, u32 sid)
+{
+ if (state < AUDIT_OFF || state > AUDIT_LOCKED)
+ return -EINVAL;
- /* If we are allowed, make the change */
- if (res == 1)
- audit_enabled = state;
- /* Not allowed, update reason */
- else if (rc == 0)
- rc = -EPERM;
- return rc;
+ return audit_do_config_change("audit_enabled", &audit_enabled, state,
+ loginuid, sid);
}
static int audit_set_failure(int state, uid_t loginuid, u32 sid)
{
- int res, rc = 0, old = audit_failure;
-
if (state != AUDIT_FAIL_SILENT
&& state != AUDIT_FAIL_PRINTK
&& state != AUDIT_FAIL_PANIC)
return -EINVAL;
- /* check if we are locked */
- if (audit_enabled == 2)
- res = 0;
- else
- res = 1;
-
- if (sid) {
- char *ctx = NULL;
- u32 len;
- if ((rc = selinux_sid_to_string(sid, &ctx, &len)) == 0) {
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_failure=%d old=%d by auid=%u"
- " subj=%s res=%d",
- state, old, loginuid, ctx, res);
- kfree(ctx);
- } else
- res = 0; /* Something weird, deny request */
- }
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_failure=%d old=%d by auid=%u res=%d",
- state, old, loginuid, res);
-
- /* If we are allowed, make the change */
- if (res == 1)
- audit_failure = state;
- /* Not allowed, update reason */
- else if (rc == 0)
- rc = -EPERM;
- return rc;
+ return audit_do_config_change("audit_failure", &audit_failure, state,
+ loginuid, sid);
}
static int kauditd_thread(void *dummy)
@@ -634,23 +572,14 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_PID) {
- int old = audit_pid;
- if (sid) {
- if ((err = selinux_sid_to_string(
- sid, &ctx, &len)))
- return err;
- else
- audit_log(NULL, GFP_KERNEL,
- AUDIT_CONFIG_CHANGE,
- "audit_pid=%d old=%d by auid=%u subj=%s",
- status_get->pid, old,
- loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_pid=%d old=%d by auid=%u",
- status_get->pid, old, loginuid);
- audit_pid = status_get->pid;
+ int new_pid = status_get->pid;
+
+ if (audit_enabled != AUDIT_OFF)
+ audit_log_config_change("audit_pid", new_pid,
+ audit_pid, loginuid,
+ sid, 1);
+
+ audit_pid = new_pid;
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
err = audit_set_rate_limit(status_get->rate_limit,
@@ -709,7 +638,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_DEL:
if (nlmsg_len(nlh) < sizeof(struct audit_rule))
return -EINVAL;
- if (audit_enabled == 2) {
+ if (audit_enabled == AUDIT_LOCKED) {
ab = audit_log_start(NULL, GFP_KERNEL,
AUDIT_CONFIG_CHANGE);
if (ab) {
@@ -743,7 +672,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_DEL_RULE:
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
return -EINVAL;
- if (audit_enabled == 2) {
+ if (audit_enabled == AUDIT_LOCKED) {
ab = audit_log_start(NULL, GFP_KERNEL,
AUDIT_CONFIG_CHANGE);
if (ab) {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 5d96f2cc7be8..6f19fd477aac 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -95,6 +95,8 @@ extern 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
+extern int audit_enabled;
+
void audit_free_parent(struct inotify_watch *i_watch)
{
struct audit_parent *parent;
@@ -974,7 +976,6 @@ static void audit_update_watch(struct audit_parent *parent,
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *oentry, *nentry;
- struct audit_buffer *ab;
mutex_lock(&audit_filter_mutex);
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
@@ -1014,13 +1015,18 @@ static void audit_update_watch(struct audit_parent *parent,
call_rcu(&oentry->rcu, audit_free_rule_rcu);
}
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
- audit_log_format(ab, "op=updated rules specifying path=");
- audit_log_untrustedstring(ab, owatch->path);
- audit_log_format(ab, " with dev=%u ino=%lu\n", dev, ino);
- audit_log_format(ab, " list=%d res=1", r->listnr);
- audit_log_end(ab);
-
+ if (audit_enabled) {
+ struct audit_buffer *ab;
+ ab = audit_log_start(NULL, GFP_KERNEL,
+ AUDIT_CONFIG_CHANGE);
+ audit_log_format(ab,
+ "op=updated rules specifying path=");
+ audit_log_untrustedstring(ab, owatch->path);
+ audit_log_format(ab, " with dev=%u ino=%lu\n",
+ dev, ino);
+ audit_log_format(ab, " list=%d res=1", r->listnr);
+ audit_log_end(ab);
+ }
audit_remove_watch(owatch);
goto add_watch_to_parent; /* event applies to a single watch */
}
@@ -1039,25 +1045,28 @@ static void audit_remove_parent_watches(struct audit_parent *parent)
struct audit_watch *w, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *e;
- struct audit_buffer *ab;
mutex_lock(&audit_filter_mutex);
parent->flags |= AUDIT_PARENT_INVALID;
list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
e = container_of(r, struct audit_entry, rule);
-
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
- audit_log_format(ab, "op=remove rule path=");
- audit_log_untrustedstring(ab, w->path);
- if (r->filterkey) {
- audit_log_format(ab, " key=");
- audit_log_untrustedstring(ab, r->filterkey);
- } else
- audit_log_format(ab, " key=(null)");
- audit_log_format(ab, " list=%d res=1", r->listnr);
- audit_log_end(ab);
-
+ if (audit_enabled) {
+ struct audit_buffer *ab;
+ ab = audit_log_start(NULL, GFP_KERNEL,
+ AUDIT_CONFIG_CHANGE);
+ audit_log_format(ab, "op=remove rule path=");
+ audit_log_untrustedstring(ab, w->path);
+ if (r->filterkey) {
+ audit_log_format(ab, " key=");
+ audit_log_untrustedstring(ab,
+ r->filterkey);
+ } else
+ audit_log_format(ab, " key=(null)");
+ audit_log_format(ab, " list=%d res=1",
+ r->listnr);
+ audit_log_end(ab);
+ }
list_del(&r->rlist);
list_del_rcu(&e->list);
call_rcu(&e->rcu, audit_free_rule_rcu);
@@ -1495,6 +1504,9 @@ static void audit_log_rule_change(uid_t loginuid, u32 sid, char *action,
{
struct audit_buffer *ab;
+ if (!audit_enabled)
+ return;
+
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (!ab)
return;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 23:49:31 +0000