_FORTIFY_SOURCE is a Glibc feature which adds memory and string functionprotection. There is no home site for this feature, but it is described wellon this page: http://gcc.gnu/ml/gcc-patches/2004-09/msg02055.html


ref:

1. http://www.linuxfromscratch/hints/downloads/files/ssp.txt

2.https://gcc.gnu/ml/gcc-patches/2004-09/msg02055.html

3.http://manpages.courier-mta/htmlman7/feature_test_macros.7.html

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Glibc feature _FORTIFY_SOURCE