Yet another Linux kernel security feature coming to the mainline kernel that appears readied for the Linux 4.8 merge window is hardened usercopy.
Hardened usercopy was originally based upon GrSecurity’s PAX_USERCOPY feature but reworked into a whole new form, according to developer Kees Cook at Google. This hardened usercopy is to be exposed as the CONFIG_HARDENED_USERCOPY option within the kernel.
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