CSU Hardening
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As of , the CSU has been hardened to remove the useful gadgets. is the offendor, and it essentially removes __libc_csu_init
(as well as a couple other functions) entirely.
Unfortunately, changing this breaks the ABI (application binary interface), meaning that any binaries compiled in this way can not run on pre-2.34 glibc versions - which can make things quite annoying for CTF challenges if you have an outdated glibc version. Older compilations, however, can work on the newer versions.