xguest: firefox - execmem

[Dominick Grift]

On Tue, Aug 18, 2009 at 10:22:26AM +0200, Christoph A. wrote:
> Hi,
> 
> I wanted to try the xguest user, but firefox always crashed on startup.
> 
> This AVC appears many times in the logs:
> 
> type=AVC msg=audit(1250580934.287:24730): avc: denied { execmem } for
> pid=4845 comm="firefox" scontext=xguest_u:xguest_r:mozilla_t:s0
> tcontext=xguest_u:xguest_r:mozilla_t:s0 tclass=process

I have a feeling that this is due to a plugin that i not run in the nsplugin_t domain, but i might be wrong.
Can you confirm or deny that?

Afaik mozilla does not require { execmem }, but many of those crappy plugins do ( for example flash-plugin ).
I certain configurations those plugins do not get run in the designated nsplugin_t domain.

In that case firefox runs them.

I am not sure whether mozilla_t domain transitions to nsplugin_t at all.

In practice i believe it does not matter all that much what needs it. You can allow or (silently) deny it.
You can use audit2allow to create an add-on to the mozilla_t domain.

Pipe the particular AVC denial into audit2allow -M mymozilla; semodule -i mymozilla.pp

> 
> 
> execmem is not allowed:
> getsebool -a|grep execmem
> allow_execmem --> off
> 
> Allowing execmem resolves the problem, but is there a better solution
> for this?
> 
> Another question:
> 
> I would like to make some permanent changes to the xguest account
> (keyboard layout, safe passphrase for wifi access, set keyring pw,
> remove some icons,...)
> How can I as admin do that?
> 
> thanks,
> Christoph
> 



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