Re: Problem with compiling refpolicy base.pp

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On Wed, 2010-03-03 at 10:21 -0500, Stephen Smalley wrote:
> On Wed, 2010-03-03 at 17:31 +0300, AlannY wrote:
> > Hi there.
> > 
> > I'm trying to compile refpolicy. I have checkpolicy 2.0.20 and misc
> > tools (libselinux policycoreutils). I'm trying to:
> > 
> >     make bare
> >     make conf
> >     make base.pp
> > 
> > My configuration:
> > 
> > TYPE=mcs
> > NAME=refpolicy
> > UNK_PERMS=allow
> > DIRECT_INITRC=n
> > MONOLITHIC=n
> > UBAC=n
> > MLS_CATS=1024
> > MCS_CATS=1024
> > 
> > But, the last command failed with the following error:
> > 
> >     Creating refpolicy base module base.conf
> >     cat tmp/pre_te_files.conf tmp/all_attrs_types.conf
> > tmp/global_bools.conf tmp/only_te_rules.conf tmp/all_post.conf > base.conf
> >     Compiling refpolicy base module
> >     /usr/bin/checkmodule -M -U allow base.conf -o tmp/base.mod
> >     /usr/bin/checkmodule:  loading policy configuration from base.conf
> >     base.conf:2032:ERROR 'syntax error' at token ':c0.c1023' on line 2032:
> >     level s0:c0.c1023;
> > 
> > Seems to be, it's a good line (2032), but checkmodule can't eat it.
> > 
> > Where can be the probem?
> 
> Looks like a scanner problem to me.  There have been problems with some
> versions of flex, e.g. see:
> http://marc.info/?t=125613782400001&r=1&w=2
> but no one has ever tracked it down precisely and I've never been able
> to reproduce.  Modify your checkpolicy Makefile to pass -d to $(LEX) so
> that it generates debug output and then capture the stderr of running
> checkpolicy on base.conf.  Here I get the following output for that
> line:
> --accepting rule at line 55 ("
> level s0:c0.c1023;")
> --accepting rule at line 116 ("level")
> --accepting rule at line 227 (" ")
> --accepting rule at line 219 ("s0")
> --accepting rule at line 235 (":")
> --accepting rule at line 219 ("c0.c1023")
> --accepting rule at line 236 (";")
> 
> Note that the ":" gets treated as a separate token above, as it should,
> whereas your checkmodule seems to not be splitting it properly.
> 
> You can look at checkpolicy/policy_scan.l and see if anything strikes
> you as problematic, but it looks sane to me.  Maybe it is matching on
> ipv6_addr instead.  On second look, I'm wondering why ipv6_addr has . in
> the pattern.  Does this help?
> 
> diff --git a/checkpolicy/policy_scan.l b/checkpolicy/policy_scan.l
> index 48128a8..b7b8f0a 100644
> --- a/checkpolicy/policy_scan.l
> +++ b/checkpolicy/policy_scan.l
> @@ -219,7 +219,7 @@ PERMISSIVE			{ return(PERMISSIVE); }
>  {letter}({alnum}|[_\-])*([\.]?({alnum}|[_\-]))*	{ return(IDENTIFIER); }
>  {digit}+|0x{hexval}+            { return(NUMBER); }
>  {digit}{1,3}(\.{digit}{1,3}){3}    { return(IPV4_ADDR); }
> -{hexval}{0,4}":"{hexval}{0,4}":"({hexval}|[:.])*  { return(IPV6_ADDR); }
> +{hexval}{0,4}":"{hexval}{0,4}":"({hexval}|":")*  { return(IPV6_ADDR); }
>  {digit}+(\.({alnum}|[_.])*)?    { return(VERSION_IDENTIFIER); }
>  #line[ ]1[ ]\"[^\n]*\"		{ set_source_file(yytext+9); }
>  #line[ ]{digit}+	        { source_lineno = atoi(yytext+6)-1; }

Hmm...and does the second "." in VERSION_IDENTIFIER need to be quoted or
escaped via backslash as well?

-- 
Stephen Smalley
National Security Agency


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