[gentoo-hardened] Any hardened features to protect from CVE-2016–5195 like vulnerabilities?

[Andrew Savchenko]

Hi all,

I'd like to know is there any way to protect from kernel
vulnerabilities like CVE-2016–5195 (mad COW) using hardened
technologies. (I'm not talking about how to fix this exact CVE, but
how to protect from similar failures in future.)

Based on exploit published I can think of the following approaches:

1) Exploit runs enormous amounts of madvise() calls, any way to
rate limit it or block after some threshold is reached? I doubt
there is any legitimate use case for calling madvise() that often.

2) Exploits uses huge rate of write() calls and most the fails due
to access restrictions. This is definitely suspicious. Can such
behaviour be spotted and blocked by some security feature?

3) Can some hardware features like Intel TSX be used to protect
from such race conditions? 

Best regards,
Andrew Savchenko