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Re: [RFC][PATCH] collect security labels on user processes generating audit messages



Steve Grubb wrote:
> This should be a separate thread since the topic is different.
> 
> On Wednesday 15 February 2006 11:14, Linda Knippers wrote:
> 
>>Amy submitted a patch a while back to eliminate the "name=" field
>>to avoid "name=(null)" from the audit records if there was no name
>>but I don't think the patch went anywhere.
> 
> 
> Right. I want all audit fields to have name=value. If we have %s in the 
> message and pass NULL to it, snprintf is already going to put "(null)" so 
> what's wrong with just using this precedent?

The problem is that "(null)" is a valid file name.

[ljk cert-e2 ~]$ touch "(null)"
[ljk cert-e2 ~]$ ls -l "(null)"
-rw-rw-r--  1 ljk ljk 0 Feb 17 11:14 (null)

When I look at audit records generated by those commands I see records
like this:

type=SYSCALL msg=audit(1140192875.311:3789): arch=c000003e syscall=132
success=yes exit=0 a0=7fbffffc51 a1=0 a2=1b6 a3=0 items=1 pid=2116
auid=501 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 sgid=501
fsgid=501 comm="touch" exe="/bin/touch"
type=CWD msg=audit(1140192875.311:3789):  cwd="/home/ljk"
type=PATH msg=audit(1140192875.311:3789): name="(null)" flags=1
inode=6537222 dev=fd:01 mode=0100664 ouid=501 ogid=501 rdev=00:00

How can I tell from the audit records that the file name was "(null)"
vs. having "(null)" manufactured by the audit system?

-- ljk

> 
>>It looks like there's a new case (for tty) where "(none)" is used.
> 
> 
> Yes for the same reason.
> 
> 
> 
>>It would be nice to avoid having this in the audit records, especially
>>in this case where the value might never be set on a particular system.
> 
> 
> It creates parsing problems without a value. If I saw "tty="  and that's all, 
> I'd think the audit system malfunctioned and file a bugzilla. I don't want 
> that.
> 
> -Steve
> 


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