Harden common str/mem functions against buffer overflows

configname: CONFIG_FORTIFY_SOURCE

Linux Kernel Configuration
└─>Security options
└─>Harden common str/mem functions against buffer overflows
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Detect overflows of buffers in common string and memory functions
where the compiler can determine and validate the buffer sizes.

depends
CONFIG_ARCH_HAS_FORTIFY_SOURCE
NOT CONFIG_CC_IS_CLANG or  NOT CONFIG_X86_32