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Linux_Hardening.md: Fix _FORTIFY_SOURCE macro #24

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Linux_Hardening.md: Fix _FORTIFY_SOURCE macro #24

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3 changes: 2 additions & 1 deletion content/docs/security/Linux_Hardening.md
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Expand Up @@ -282,7 +282,7 @@ This is all managed via /etc/fstab
* https://linux.die.net/man/8/execstack

###### Source Fortification
* Usage: ```-DFORTIFY_SOURCE=2```
* Usage: ```-D_FORTIFY_SOURCE=2 -O2``` or ```-D_FORTIFY_SOURCE=3 -O2``` (the latter adds runtime overhead)
* Intention:
* Many programs rely on functions that are not aware of buffer-length
* Buffer overflow exploits often take advantage of these functions
Expand All @@ -293,6 +293,7 @@ This is all managed via /etc/fstab
* Resources:
* https://github.com/intel/safestringlib/wiki/FORTIFY-SOURCE-and-Safe-String-Library
* https://idea.popcount.org/2013-08-15-fortify_source/
* https://developers.redhat.com/articles/2022/09/17/gccs-new-fortification-level

###### Run-time bounds checking for C++ strings/containers
* Usage: ```-Wp, -D_GLIBCXX_ASSERTIONS```
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