From 92c82e8a322b32a6cabe7d8800dc10401157a623 Mon Sep 17 00:00:00 2001 From: Richard Guy Briggs Date: Fri, 13 Jan 2017 03:26:29 -0500 Subject: audit: add feature audit_lost reset Add a method to reset the audit_lost value. An AUDIT_SET message with the AUDIT_STATUS_LOST flag set by itself will return a positive value repesenting the current audit_lost value and reset the counter to zero. If AUDIT_STATUS_LOST is not the only flag set, the reset command will be ignored. The value sent with the command is ignored. The return value will be the +ve lost value at reset time. An AUDIT_CONFIG_CHANGE message will be queued to the listening audit daemon. The message will be a standard CONFIG_CHANGE message with the fields "lost=0" and "old=" with the latter containing the value of audit_lost at reset time. See: https://github.com/linux-audit/audit-kernel/issues/3 Signed-off-by: Richard Guy Briggs Acked-by: Steve Grubb Signed-off-by: Paul Moore --- kernel/audit.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'kernel/audit.c') diff --git a/kernel/audit.c b/kernel/audit.c index 57acf2541fdd..25dd70a588b2 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -121,7 +121,7 @@ u32 audit_sig_sid = 0; 3) suppressed due to audit_rate_limit 4) suppressed due to audit_backlog_limit */ -static atomic_t audit_lost = ATOMIC_INIT(0); +static atomic_t audit_lost = ATOMIC_INIT(0); /* The netlink socket. */ static struct sock *audit_sock; @@ -1052,6 +1052,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (err < 0) return err; } + if (s.mask == AUDIT_STATUS_LOST) { + u32 lost = atomic_xchg(&audit_lost, 0); + + audit_log_config_change("lost", 0, lost, 1); + return lost; + } break; } case AUDIT_GET_FEATURE: -- cgit v1.2.3-70-g09d2