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SubjectRe: 64bit port
   From: hpa@transmeta.com (H. Peter Anvin)
Date: 1 May 1999 10:29:25 GMT

No good... it's trivial for the malicious user to bypass the
simple-minded check. The general problem is uncomputable.

If you mark read-only pages as clean after you scan them, and do
checks on ITLB misses for pages which have been written to, plus add a
special hook in the kernel for the dynamic linker to write instruction
relocations efficiently in the face of this, I believe it can be done
without too much of a performance hit for dynamic linking.

Later,
David S. Miller
davem@redhat.com

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