Re: [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary

[Frank Ch. Eigler]

Vivek Goyal <vgoyal@xxxxxxxxxx> writes:

> [...]
>> Can you please tell a bit more how this patch protect against direct
>> writing to the blocks?
>
> If you have loaded all the pages from disk and locked them in memory and
> verified the signature, then even if somebody modifies a block on disk
> it does not matter. We will not read pages from disk anymore for this
> exec(). We verified the signature of executable loaded in memory and
> in-memory copy is intact.

Does this imply dramatically increasing physical RAM pressure and load
latency, because binaries (and presumably all their shared libraries)
have to be locked & loaded?  (Else if they are paged out to
encrypted-swap, is that sufficient protection against manipulation?)

- FChE
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