Honest question: shouldn't something called a "stack canary" prevent an app from getting here?pic.twitter.com/Yi4kLbNTqB
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Even with -fstack-protector-all I have control of the RET and the instructions thereafter. Maybe need to read up on its enforcement.
Upon further investigation the faulting RET is in LIBC itself, so -fstack-protector-* of the target app is irrelevant it seems.
Also interesting that even with Hardened Gentoo, there are no canaries to stop the overflow. https://wiki.gentoo.org/wiki/Hardened/FAQ#Can_I_add_-fstack-protector-all_or_-fstack-protector_in_the_make.conf_CFLAGS.3F …
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