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From: Sami Tolvanen <samitolvanen@google.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Kees Cook <keescook@chromium.org>
Cc: linux-mm@kvack.org, linux-riscv@lists.infradead.org,
	llvm@lists.linux.dev,  linux-kernel@vger.kernel.org,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57
Date: Fri, 29 Sep 2023 21:11:56 +0000	[thread overview]
Message-ID: <20230929211155.3910949-4-samitolvanen@google.com> (raw)

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


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WARNING: multiple messages have this Message-ID (diff)
From: Sami Tolvanen <samitolvanen@google.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Kees Cook <keescook@chromium.org>
Cc: linux-mm@kvack.org, linux-riscv@lists.infradead.org,
	llvm@lists.linux.dev,  linux-kernel@vger.kernel.org,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57
Date: Fri, 29 Sep 2023 21:11:56 +0000	[thread overview]
Message-ID: <20230929211155.3910949-4-samitolvanen@google.com> (raw)

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


             reply	other threads:[~2023-09-29 21:12 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-29 21:11 Sami Tolvanen [this message]
2023-09-29 21:11 ` [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57 Sami Tolvanen
2023-09-29 21:11 ` [PATCH 1/2] mm: Change mmap_rnd_bits_max to __ro_after_init Sami Tolvanen
2023-09-29 21:11   ` Sami Tolvanen
2023-09-29 21:55   ` Kees Cook
2023-09-29 21:55     ` Kees Cook
2023-09-29 21:11 ` [PATCH 2/2] riscv: mm: Update mmap_rnd_bits_max Sami Tolvanen
2023-09-29 21:11   ` Sami Tolvanen
2023-09-29 21:54   ` Kees Cook
2023-09-29 21:54     ` Kees Cook
2023-09-29 22:52     ` Sami Tolvanen
2023-09-29 22:52       ` Sami Tolvanen
2023-09-30  9:02       ` Conor Dooley
2023-09-30  9:02         ` Conor Dooley
2023-09-30 21:01         ` Kees Cook
2023-09-30 21:01           ` Kees Cook
2023-10-01 15:19           ` Pedro Falcato
2023-10-01 15:19             ` Pedro Falcato
2023-10-02  7:02             ` Alexandre Ghiti
2023-10-02  7:02               ` Alexandre Ghiti
2023-10-02 15:58               ` Sami Tolvanen
2023-10-02 15:58                 ` Sami Tolvanen
2023-12-06 13:14 ` [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57 Palmer Dabbelt
2023-12-06 13:14   ` Palmer Dabbelt
2023-12-06 20:28   ` Kees Cook
2023-12-06 20:28     ` Kees Cook
2024-01-17 20:29   ` Sami Tolvanen
2024-01-17 20:29     ` Sami Tolvanen
2024-01-25 21:30 ` patchwork-bot+linux-riscv
2024-01-25 21:30   ` patchwork-bot+linux-riscv

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