Re: pulseaudio, policykit - works in permissive, fails in enforcing

["Tom London" <selinux@xxxxxxxxx>]

On Dec 3, 2007 3:54 PM, Tom London <selinux@xxxxxxxxx> wrote:
>
> On Dec 3, 2007 3:50 PM, Tom London <selinux@xxxxxxxxx> wrote:
> > Forgot to attach the AVCs......
> >
> > Does this one look suspicious?
> >
> > type=AVC msg=audit(1196722543.811:703): avc:  denied  { search } for
> > pid=2746 comm="ck-get-x11-disp" name="2719" dev=proc ino=9484
> > scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
> > tcontext=system_u:system_r:xdm_xserver_t:s0-s0:c0.c1023 tclass=dir
> > type=SYSCALL msg=audit(1196722543.811:703): arch=40000003 syscall=5
> > success=no exit=-13 a0=8299418 a1=8000 a2=0 a3=8000 items=0 ppid=2715
> > pid=2746 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
> > sgid=0 fsgid=0 tty=(none) comm="ck-get-x11-disp"
> > exe="/usr/libexec/ck-get-x11-display-device"
> > subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)
> >
>
> Attached compressed....sigh
>
Reran the above in permissive mode.  This seemed suspicious:

type=AVC msg=audit(1196779565.801:132): avc:  denied  { search } for
pid=2614 comm="ck-get-x11-disp" name="2587" dev=proc ino=9642
scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
tcontext=system_u:system_r:xdm_xserver_t:s0-s0:c0.c1023 tclass=dir
type=AVC msg=audit(1196779565.801:132): avc:  denied  { read } for
pid=2614 comm="ck-get-x11-disp" name="stat" dev=proc ino=9861
scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
tcontext=system_u:system_r:xdm_xserver_t:s0-s0:c0.c1023 tclass=file
type=SYSCALL msg=audit(1196779565.801:132): arch=40000003 syscall=5
success=yes exit=4 a0=8d27418 a1=8000 a2=0 a3=8000 items=0 ppid=2585
pid=2614 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
sgid=0 fsgid=0 tty=(none) comm="ck-get-x11-disp"
exe="/usr/libexec/ck-get-x11-display-device"
subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1196779565.802:133): avc:  denied  { getattr } for
pid=2614 comm="ck-get-x11-disp" path="/proc/2587/stat" dev=proc
ino=9861 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
tcontext=system_u:system_r:xdm_xserver_t:s0-s0:c0.c1023 tclass=file
type=SYSCALL msg=audit(1196779565.802:133): arch=40000003 syscall=197
success=yes exit=0 a0=4 a1=bff4cfc8 a2=bdcff4 a3=8d27418 items=0
ppid=2585 pid=2614 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
egid=0 sgid=0 fsgid=0 tty=(none) comm="ck-get-x11-disp"
exe="/usr/libexec/ck-get-x11-display-device"
subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)

So, I did a 'audit2allow -M localpulse2' on the above.

Here is the .te file:

module localpulse2 1.0;

require {
        type xdm_xserver_t;
        type xdm_t;
        class dir search;
        class file { read getattr };
}

#============= xdm_t ==============
allow xdm_t xdm_xserver_t:dir search;
allow xdm_t xdm_xserver_t:file { read getattr };

'semodule -i localpulse2.pp' makes pulseaudio work.

Should this be added?

tom
-- 
Tom London

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