linux-kernel - [PATCH 0/2] scs: switch to vmapped shadow stacks

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Date:   Thu, 22 Oct 2020 13:23:53 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH 0/2] scs: switch to vmapped shadow stacks

As discussed a few months ago [1][2], virtually mapped shadow call stacks
are better for safety and robustness. This series dusts off the VMAP
option from the original SCS patch series and switches the kernel to use
virtually mapped shadow stacks unconditionally when SCS is enabled.

 [1] https://lore.kernel.org/lkml/20200515172355.GD23334@willie-the-truck/
 [2] https://lore.kernel.org/lkml/20200427220942.GB80713@google.com/


Sami Tolvanen (2):
  scs: switch to vmapped shadow stacks
  arm64: scs: use vmapped IRQ and SDEI shadow stacks

 arch/arm64/include/asm/scs.h | 21 ++++++++++-
 arch/arm64/kernel/entry.S    |  6 ++--
 arch/arm64/kernel/irq.c      |  2 ++
 arch/arm64/kernel/scs.c      | 67 +++++++++++++++++++++++++++++++++---
 arch/arm64/kernel/sdei.c     |  7 ++++
 include/linux/scs.h          | 15 +++-----
 kernel/scs.c                 | 67 ++++++++++++++++++++++++++++++------
 7 files changed, 156 insertions(+), 29 deletions(-)


base-commit: 96485e4462604744d66bf4301557d996d80b85eb
-- 
2.29.0.rc1.297.gfa9743e501-goog