Re: dbus reading /proc/X/cmdline

[Stephen Smalley <sds@tycho.nsa.gov>]

On Wed, 2009-03-04 at 23:09 +1100, Russell Coker wrote:
> Why does the dbus-daemon want to read the cmdline of every process that it 
> talks to?  Is it something to allow or dontaudit?  It appears to work without 
> allowing it.
> 
> type=AVC msg=audit(1236168464.840:83): avc:  denied  { search } for  pid=2757 
> comm="dbus-daemon" name="2874" dev=proc ino=12535 
> scontext=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023 
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=dir
> type=AVC msg=audit(1236168464.840:83): avc:  denied  { read } for  pid=2757 
> comm="dbus-daemon" name="cmdline" dev=proc ino=12536 
> scontext=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023 
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file
> type=SYSCALL msg=audit(1236168464.840:83): arch=40000003 syscall=5 success=yes 
> exit=16 a0=b8481fa0 a1=0 a2=b3a a3=b84826c0 items=0 ppid=1 pid=2757 
> auid=4294967295 uid=103 gid=105 euid=103 suid=103 fsuid=103 egid=105 sgid=105 
> fsgid=105 tty=(none) ses=4294967295 comm="dbus-daemon" 
> exe="/usr/bin/dbus-daemon" 
> subj=unconfined_u:unconfined_r:system_dbusd_t:s0-s0:c0.c1023 key=(null)

It appears to fetch that information for logging purposes (comm= field).

-- 
Stephen Smalley
National Security Agency


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