Distinction between fortify source level

[asarubbo]

Hello,

since a while FORTIFY_SOURCE=3 was added:
https://developers.redhat.com/blog/2021/04/16/broadening-compiler-checks-for-buffer-overflows-in-_fortify_source

I didn't dig into it to understand if it is possible to distinguish between 2 and 3 but would be great report which level of fortify has an elf.

Thanks

[Artoria2e5]

The difference from 2 is this __builtin_dynamic_object_size bit, but it probably won't show up in the symbol table.

[petervas]

@slimm609 I think this can be closed. There does not seem to be a stable way to detect the level currently.

[slimm609]

Yes, This can be closed. After a pretty large amount of investigation, a way to detect the level could not be accurately identified