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HBSD: Harden the RTLD

Shawn Webb requested to merge hardened/current/rtld-hardening into hardened/current/master

Add a new sysctl node, hardening.harden_rtld, that will drive the RTLD's hardening logic. Hardening LD_PRELOAD is a good first step towards a generalized RTLD hardening approach. LD_PRELOAD is a common code injection technique.

Signed-off-by: Shawn Webb shawn.webb@hardenedbsd.org MFC-to: 13-STABLE

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