linux-kernel - [PATCH 0/2] riscv: Increase mmap_rnd_bits

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Message-ID: <20230929211155.3910949-4-samitolvanen@google.com>
Date:   Fri, 29 Sep 2023 21:11:56 +0000
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57

Hi all,

We noticed that 64-bit RISC-V kernels limit mmap_rnd_bits to 24
even if the hardware supports a larger virtual address space size
[1]. These two patches allow mmap_rnd_bits_max to be changed during
init, and bumps up the maximum randomness if we end up setting up
4/5-level paging at boot.

Sami

 [1] https://github.com/google/android-riscv64/issues/1


Sami Tolvanen (2):
  mm: Change mmap_rnd_bits_max to __ro_after_init
  riscv: mm: Update mmap_rnd_bits_max

 arch/riscv/mm/init.c | 6 ++++++
 include/linux/mm.h   | 2 +-
 mm/mmap.c            | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)


base-commit: 6465e260f48790807eef06b583b38ca9789b6072
-- 
2.42.0.582.g8ccd20d70d-goog