Messages of type AUDIT_USER_TTY were being formatted to 1024 octets, truncating messages approaching MAX_AUDIT_MESSAGE_LENGTH (8970 octets). Set the formatting to 8560 characters, given maximum estimates for prefix and suffix budgets. See the problem discussion: https://www.redhat.com/archives/linux-audit/2009-January/msg00030.html And the new size rationale: https://www.redhat.com/archives/linux-audit/2013-September/msg00016.html Test ~8k messages with: auditctl -m "$(for i in $(seq -w 001 820);do echo -n "${i}0______";done)" Reported-by: LC Bruzenak <lenny(a)magitekltd.com&gt; Reported-by: Justin Stephenson <jstephen(a)redhat.com&gt; Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; --- kernel/audit.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/audit.c b/kernel/audit.c index 91e53d0..939cff1 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -715,7 +715,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) } audit_log_common_recv_msg(&ab, msg_type); if (msg_type != AUDIT_USER_TTY) - audit_log_format(ab, " msg='%.1024s'", + audit_log_format(ab, " msg='%.8560s'", (char *)data); else { int size; -- 1.7.1