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On the
tech@ mailing list,
Theo de Raadt (deraadt@)
has issued a
request for testing
of patch(es) for execute-only (xonly)
binaries on amd64.
The message is quite long, but well worth reading in its entirety
for those interested.
Selected highlights include:
Some of you have probably noticed activity about "xonly" happening to a bunch of architectures. First arm64, then riscv64, then hppa, and ongoing efforts with octeon, sparc64 (sun4u only), and more of this is going to come in the future. Like past work decades ago (and I suppose continually also) on W^X, and increasing use of c, the idea here is to have code (text segments) not be readable. Or in a more generic sense, if you mprotect a region with only PROT_EXEC, it is not readable. […] But most of us have amd64 machines. Thrilling news:
