Hi, as you may be aware, LUKS2 currently doesn't support the Argon2 key derival function (KDF). While the implementation itself isn't much of a problem in theory, one issue we currently have is that Argon2 is a memory-safe KDF and thus requires huge chunks of memory. The memory management subsystem isn't currently up to task to handle huge allocations on all platforms. So back in March, we decided to improve the MM subsystem first before landing Argon2 support.
This patch series is a first RFC to ask for feedback on my chosen approach. It implements a new callback that may be set up by the platform-MM-implementation. In case currently allocated memory regions don't have sufficient bytes available to satisfy a given memory allocation, the callback will be invoked in order to make an additional memory region available that can satisfy the request. As such, we avoid all the downsides of pre-allocating a huge heap and can just dynamically handle any huge requests. I only compile-tested the code, meaning it probably won't work out-of-the-box. My intention is mainly to first get an agreement on whether this seems like a sensible approach to fix the problem. Patrick Patrick Steinhardt (3): mm: allow dynamically requesting additional memory regions efi: mm: extract function to add memory regions efi: mm: implement runtime addition of pages grub-core/kern/efi/mm.c | 66 +++++++++++++++++------------------------ grub-core/kern/mm.c | 11 ++++++- include/grub/mm.h | 13 ++++++++ 3 files changed, 50 insertions(+), 40 deletions(-) -- 2.26.2
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