Messages in this thread | | | Date | Mon, 3 Aug 2020 20:48:17 -0400 | From | "Frank Ch. Eigler" <> | Subject | Re: [PATCH v4 00/10] Function Granular KASLR |
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Hi -
> > We have relocated based on sections, not some subset of function > > symbols accessible that way, partly because DWARF line- and DIE- based > > probes can map to addresses some way away from function symbols, into > > function interiors, or cloned/moved bits of optimized code. It would > > take some work to prove that function-symbol based heuristic > > arithmetic would have just as much reach. > > Interesting. Do you have an example handy?
No, I'm afraid I don't have one that I know cannot possibly be expressed by reference to a function symbol only. I'd look at systemtap (4.3) probe point lists like:
% stap -vL 'kernel.statement("*@kernel/*verif*.c:*")' % stap -vL 'module("amdgpu").statement("*@*execution*.c:*")'
which give an impression of computed PC addresses.
> It seems like something like that would reference the enclosing > section, which means we can't just leave them out of the sysfs > list... (but if such things never happen in the function-sections, > then we *can* remove them...)
I'm not sure we can easily prove they can never happen there.
- FChE
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