[AUDIT] LOGIN message credentials

Attached is a new patch that solves the issue of getting valid credentials 
into the LOGIN message. The current code was assuming that the audit context 
had already been copied. This is not always the case for LOGIN messages.

To solve the problem, the patch passes the task struct to the function that 
emits the message where it can get valid credentials.

Signed-off-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 66148f8..37b3ac9 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1010,20 +1010,21 @@ void audit_get_stamp(struct audit_context *ctx,
 
 extern int audit_set_type(struct audit_buffer *ab, int type);
 
-int audit_set_loginuid(struct audit_context *ctx, uid_t loginuid)
+int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
 {
-	if (ctx) {
+	if (task->audit_context) {
 		struct audit_buffer *ab;
 
 		ab = audit_log_start(NULL);
 		if (ab) {
 			audit_log_format(ab, "login pid=%d uid=%u "
 				"old loginuid=%u new loginuid=%u",
-				ctx->pid, ctx->uid, ctx->loginuid, loginuid);
+				task->pid, task->uid, 
+				task->audit_context->loginuid, loginuid);
 			audit_set_type(ab, AUDIT_LOGIN);
 			audit_log_end(ab);
 		}
-		ctx->loginuid = loginuid;
+		task->audit_context->loginuid = loginuid;
 	}
 	return 0;
 }