Honest question: shouldn't something called a "stack canary" prevent an app from getting here?pic.twitter.com/Yi4kLbNTqB
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may show *** stack smashing detected *** and SIGABRT, e.g. if there's a JMP instruction. That behavior seems not too safe, though.
checksec.sh just checks if __stack_chk_fail sym is present binary-wide. Your function may fail heuristics: https://outflux.net/blog/archives/2014/01/27/fstack-protector-strong/ …
Even with -fstack-protector-all I have control of the RET and the instructions thereafter. Maybe need to read up on its enforcement.
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