Re: pcre 8.33 changes restorecon behavior

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On 06/24/2013 08:50 AM, Stephen Smalley wrote:
> On 06/22/2013 12:17 PM, Sven Vermeulen wrote:
>> Hi guys
>> 
>> Since libpcre 8.33, the behavior of restorecon is different. Take the 
>> context for /sbin for instance:
>> 
>> Before libpcre 8.33: # matchpathcon /sbin /sbin
>> system_u:object_r:bin_t:s0
>> 
>> With and after libpcre 8.33: # matchpathcon /sbin /sbin    <<none>>
>> 
>> As a result, trying to reset the label fails:
>> 
>> # restorecon -Fv /sbin restorecon:  Warning no default label for /sbin
>> 
>> Is this a bug in libpcre or are we using it differently? According to 
>> Alphat-PC, it is due to rev 1313 of libpcre: 
>> http://vcs.pcre.org/viewvc?view=revision&revision=1313
>> 
>> Thanks to Alphat-PC for reporting and debugging it at 
>> https://bugs.gentoo.org/show_bug.cgi?id=471718
> 
> Looks to me as if the compiled regex format changed.  So that would be a
> problem for previously compiled regexes cached in the .bin files under 
> /etc/selinux/$SELINUXTYPE/contexts/files.  You would need to re-run 
> sefcontext_compile to regenerate them or delete them and fall back to
> loading from the source configurations.
> 
> Not sure if there is a way to automatically detect the change in format
> and handle the conversion on the libselinux side.
> 
> 
> 
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We could add a trigger when pcre is updated to rerun the commands.

Adding something like the following to selinux-policy, would rebuild the pcre
files.

%triggerin -- pcre
selinuxenabled && semodule -nB
exit 0


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