Re: [PATCH v16 1/5] mm: add VM_DROPPABLE for designating always lazily freeable mappings
From: Andy Lutomirski <luto@amacapital.net>
Date: 2024-06-07 18:40:48
Also in:
linux-crypto, linux-mm, linux-patches, lkml
On Tue, May 28, 2024 at 5:24 AM Jason A. Donenfeld [off-list ref] wrote:
The vDSO getrandom() implementation works with a buffer allocated with a new system call that has certain requirements: - It shouldn't be written to core dumps. * Easy: VM_DONTDUMP.
I'll bite: why shouldn't it be written to core dumps? The implementation is supposed to be forward-secret: an attacker who gets the state can't predict prior outputs. And a core-dumped process is dead: there won't be future outputs.