linux-kernel - Re: [RFC PATCH 1/7] audit: don't needlessly reset valid wait time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 5 Nov 2015 10:17:37 -0500
From:	Paul Moore <paul@...l-moore.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	v.rathor@...il.com
Subject: Re: [RFC PATCH 1/7] audit: don't needlessly reset valid wait time

On Wed, Nov 4, 2015 at 10:13 PM, Richard Guy Briggs <rgb@...hat.com> wrote:
> On 15/11/04, Paul Moore wrote:
>> On Thursday, October 22, 2015 02:53:14 PM Richard Guy Briggs wrote:
>> > After auditd has recovered from an overflowed queue, the first process
>> > that doesn't use reserves to make it through the queue checks should
>> > reset the audit backlog wait time to the configured value.  After that,
>> > there is no need to keep resetting it.
>> >
>> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
>> > ---
>> >  kernel/audit.c |    2 +-
>> >  1 files changed, 1 insertions(+), 1 deletions(-)
>> >
>> > diff --git a/kernel/audit.c b/kernel/audit.c
>> > index a72ad37..daefd81 100644
>> > --- a/kernel/audit.c
>> > +++ b/kernel/audit.c
>> > @@ -1403,7 +1403,7 @@ struct audit_buffer *audit_log_start(struct
>> > audit_context *ctx, gfp_t gfp_mask, return NULL;
>> >     }
>> >
>> > -   if (!reserve)
>> > +   if (!reserve && !audit_backlog_wait_time)
>> >             audit_backlog_wait_time = audit_backlog_wait_time_master;
>> >
>> >     ab = audit_buffer_alloc(ctx, gfp_mask, type);
>>
>> This looks fine to me, I'm going to add it to audit#next-queue.
>>
>> Also, can you think of a good reason why "audit_backlog_wait_overflow" exists?
>> I'm going to replace it with the simple "audit_backlog_wait_time = 0;" unless
>> you can think of a solid reason not to do so.  It seems much more obvious and
>> readable to me.
>
> That goes back to ac4cec44, DWMW, July 2005.  Best answer I can come up
> with is that it labels magic values and puts them up front at the top of
> the file.

Yeah, I can see that from git blame, I was hoping for some thread I
may have missed.  Oh well, not terribly important.

> I'd suggest instead replacing it with a macro.  I don't have
> an significant objection to just assigning zero where you suggest.

If it weren't zero I would agree with you, magic numbers in general
are a bit scary.  However, in this particular case I don't consider
zero to be a magic number and its use seems pretty clear given the
context.

-- 
paul moore
www.paul-moore.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/