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SELinux error when using pgf95 executables with valgrind

 
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paulv



Joined: 26 Jul 2004
Posts: 19
Location: JCSDA
PostPosted: Thu Jul 30, 2009 9:14 am    Post subject: SELinux error when using pgf95 executables with valgrind Reply with quote
Hello,

Not sure if this is the right forum, so apologies in advance if not.

I run pgf95 7.2-4 on a RHE5.0 system and when I use pgf95-generated executable with the valgrind memcheck tool, SELinux gives me a warning:

Quote:
Summary:
SELinux is preventing memcheck from loading /usr/local/pgi/linux86/7.2-4/lib/libpgc.so which requires text relocation.

Detailed Description:
The memcheck application attempted to load /usr/local/pgi/linux86/7.2-4/lib/libpgc.so which requires text relocation. This is a potential security problem. Most libraries do not need this permission. Libraries are sometimes coded incorrectly and request this permission. The SELinux Memory Protection Tests web page explains how to remove this requirement. You can configure SELinux temporarily to allow /usr/local/pgi/linux86/7.2-4/lib/libpgc.so to use relocation as a workaround, until the library is fixed. Please file a bug report against this package.

Is this issue with text relocation something PGI is aware of and looking to fix (assuming the above assessment is accurate)? Fixed in a later version?

FWIW, g95 and gfortran don't exhibit the problem when their executables are run through valgrind

cheers,

paulv
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mkcolg



Joined: 30 Jun 2004
Posts: 5001
Location: The Portland Group Inc.
PostPosted: Thu Jul 30, 2009 10:25 am    Post subject: Reply with quote
Hi Paul,

We are aware of this issue (see http://www.pgroup.com/userforum/viewtopic.php?t=1349) and have a feature request pending. However after investigating the issue, we have determined that the solution of adding PIC code to the 32-bit libraries would cause a severe performance penalty. So we're concerned that the fix for 32-bit SELinux would have a detrimental impact on rest of our 32-bit users.

How critical of an issue is this? Would you be able to statically link your code (-Bstatic_pgi)?

Thanks,
Mat
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paulv



Joined: 26 Jul 2004
Posts: 19
Location: JCSDA
PostPosted: Thu Jul 30, 2009 11:53 am    Post subject: Reply with quote
Hi Mat,

Thanks for the quick reply.
mkcolg wrote:
How critical of an issue is this? Would you be able to statically link your code (-Bstatic_pgi)?

Right now it's not critical. However, IT security being what it is, I can imagine someone will soon decide that SELinux running in permissive mode is bad and, thus, bugger up my current setup.

If statically linking the code will allow me to compile and test with an anal SELinux setup, I'll do that.

Thanks for the info.

cheers,

paulv
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