_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
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