From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Paris Subject: Re: [PATCH] Fixed reason field in audit signal logging Date: Thu, 07 Nov 2013 10:53:24 -0500 Message-ID: <1383839604.2938.42.camel@localhost> References: <20131107133932.GA10317@pauldc-Inspiron-1470> <1383835404.2938.38.camel@localhost> <1584071.15NUDX4DRn@x2> <1383838941.2938.40.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-audit-bounces@redhat.com Errors-To: linux-audit-bounces@redhat.com To: Paul Davies C Cc: viro@zeniv.linux.org.uk, linux-audit@redhat.com List-Id: linux-audit@redhat.com On Thu, 2013-11-07 at 21:21 +0530, Paul Davies C wrote: > So rather than logging the "reason=memory violation" when process ends > abnormally due to any signal delivery , it will be be better if we > leave "reason=undefined" . reason=memory_violation or invalid_pointer etc although maybe it should be just 'signal'... and you can get the signal number from the record.... > Your thoughts? > > > On Thu, Nov 7, 2013 at 9:12 PM, Eric Paris wrote: > On Thu, 2013-11-07 at 10:05 -0500, Steve Grubb wrote: > > On Thursday, November 07, 2013 09:43:24 AM Eric Paris wrote: > > > On Thu, 2013-11-07 at 19:09 +0530, Paul Davies C wrote: > > > > The audit system logs the signals that leads to abnormal > end of a process. > > > > However , as of now , it always states the reason for > failure of a process > > > > as "memory violation" regardless of the signal > delivered. This is due to > > > > the audit_core_dumps() function pass the reason for > failure blindly to > > > > the audit_log_abend() as "memory violation". > > > > > > > > This patch changes the audit_core_dumps() function as to > pass on the right > > > > reason to the audit_log_abend based on the signal > received. > > > > > > > > Signed-off-by:Paul Davies C > > > > > > Acked-by: Eric Paris > > > > > > But we really should wait for an Ack and thoughts from > steve grubb.... > > > > I am confused. This is the abnormal end event I have: > > > > type=ANOM_ABEND msg=audit(1303339663.307:142): auid=4325 > uid=0 gid=0 ses=1 > > subj=unconfined_u:unconfined_r:unconfined_t:s0 pid=3775 > comm="aureport" sig=11 > > > > Why / when did we start adding text explanations? We should > not do that. We > > didn't have it before and it should not have been added. The > signal number is > > enough to identify the problem. > > > We started adding a reason when seccomp started sending > ANOM_ABEND > events as well. It doesn't do so with a signal. Agreed, the > " " is/was > a bad idea... > > > > > If we did need a reason= field, all these strings with > spaces will get > > separated on parsing. They should be like "memory-violation" > or "recieved- > > abort". And would it be better to hide this in the > audit_log_abend function? I > > honestly don't understand why this was added. > > > > -Steve > > > > > > > > --- > > > > > > > > kernel/auditsc.c | 31 ++++++++++++++++++++++++++++++- > > > > 1 file changed, 30 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/kernel/auditsc.c b/kernel/auditsc.c > > > > index 9845cb3..3cafd13 100644 > > > > --- a/kernel/auditsc.c > > > > +++ b/kernel/auditsc.c > > > > @@ -2395,7 +2395,36 @@ void audit_core_dumps(long signr) > > > > > > > > ab = audit_log_start(NULL, GFP_KERNEL, > AUDIT_ANOM_ABEND); > > > > if (unlikely(!ab)) > > > > > > > > return; > > > > > > > > - audit_log_abend(ab, "memory violation", signr); > > > > + > > > > + /*Identify the reason for failure based on signal > delivered.*/ > > > > + switch (signr) { > > > > + case SIGABRT: > > > > + audit_log_abend(ab, "received abort", > signr); > > > > + break; > > > > + case SIGBUS: > > > > + audit_log_abend(ab, "invalid pointer > dereference", signr); > > > > + break; > > > > + case SIGFPE: > > > > + audit_log_abend(ab, "invalid floating > point instruction", > > signr); > > > > + break; > > > > + case SIGILL: > > > > + audit_log_abend(ab, "illegal > instruction", signr); > > > > + break; > > > > + case SIGSEGV: > > > > + audit_log_abend(ab, "memory > violation", signr); > > > > + break; > > > > + case SIGTRAP: > > > > + audit_log_abend(ab, "bad instruction / > debugger generated > > signal", > > > > signr); + break; > > > > + case SIGXCPU: > > > > + audit_log_abend(ab, "cpu time > violation", signr); > > > > + break; > > > > + case SIGXFSZ: > > > > + audit_log_abend(ab, "file size > violation", signr); > > > > + break; > > > > + default: > > > > + audit_log_abend(ab, "not defined", > signr); > > > > + } > > > > > > > > audit_log_end(ab); > > > > > > > > } > > > > > > > > > > -- > Regards, > Paul Davies C > vivafoss.blogspot.com