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List:       oss-security
Subject:    [oss-security] kernel: execution possible in non-executable mappings in recent 2.6
From:       Eugene Teo <eugeneteo () kernel ! sg>
Date:       2010-02-24 0:41:01
Message-ID: 4B84759D.2020406 () kernel ! sg
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http://marc.info/?l=linux-sparc&m=126662196902830&w=2
http://marc.info/?l=linux-sparc&m=126662159602378&w=2

sparc64: Fix sun4u execute bit check in TSB I-TLB load.

TSB I-tlb load code tries to use andcc to check the _PAGE_EXEC_4U bit,
but that's bit 12 so it gets sign extended all the way up to bit 63
and the test nearly always passes as a result.

Use sethi to fix the bug.

I'm not requesting a CVE for this as this does not affect any of our 
kernels. But just a heads-up for those not aware of this.

Thanks, Eugene
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