Re: [PATCH v3 3/8] securtiy/brute: Detect a brute force attack

Signed-off-by: John Wood <redacted>
---
 security/brute/brute.c | 488 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 474 insertions(+), 14 deletions(-)

diff --git a/security/brute/brute.c b/security/brute/brute.c
index 70f812bb7763..645bd6e02638 100644
--- a/security/brute/brute.c
+++ b/security/brute/brute.c

+/**
+ * print_fork_attack_running() - Warn about a fork brute force attack.
+ */
+static inline void print_fork_attack_running(void)
+{
+	pr_warn("Fork brute force attack detected [%s]\n", current->comm);
+}

+/**
+ * print_exec_attack_running() - Warn about an exec brute force attack.
+ * @stats: Statistical data shared by all the fork hierarchy processes.
+ *
+ * The statistical data shared by all the fork hierarchy processes cannot be
+ * NULL.
+ *
+ * Before showing the process name it is mandatory to find a process that holds
+ * a pointer to the exec statistics.
+ *
+ * Context: Must be called with tasklist_lock and brute_stats_ptr_lock held.
+ */
+static void print_exec_attack_running(const struct brute_stats *stats)
+{
+	struct task_struct *p;
+	struct brute_stats **p_stats;
+	bool found = false;
+
+	for_each_process(p) {
+		p_stats = brute_stats_ptr(p);
+		if (*p_stats == stats) {
+			found = true;
+			break;
+		}
 	}
+
+	if (WARN(!found, "No exec process\n"))
+		return;
+
+	pr_warn("Exec brute force attack detected [%s]\n", p->comm);
+}