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Re: [kernel-hardening] [PATCH v4 0/8] introduce post-init read-only memory

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On Tue, Jan 19, 2016 at 10:08:34AM -0800, Kees Cook wrote:

>This introduces __ro_after_init as a way to mark such memory, and uses
>it on the x86 vDSO to kill an extant kernel exploitation method. Also
>adds a new kernel parameter to help debug future use and adds an lkdtm
>test to check the results.

I've tested these patches on 32-bit ARM using the provoke-crashes
test.  However, they do require CONFIG_ARM_KERNMEM_PERMS to be enabled
as well, which does incur additional memory usage.

Do we want to consider making CONFIG_ARM_KERNMEM_PERMS default y for
security reasons, and just document that memory-constrained systems
may want to turn it off?

I'll test the arm64 next.

David

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[PATCH v4 0/8] introduce post-init read-only memory Kees Cook <keescook@chromium.org> - 2016-01-19 19:20 +0100
  [PATCH v4 7/8] lkdtm: verify that __ro_after_init works correctly Kees Cook <keescook@chromium.org> - 2016-01-19 19:20 +0100
  Re: [kernel-hardening] [PATCH v4 0/8] introduce post-init read-only  memory David Brown <david.brown@linaro.org> - 2016-01-22 18:30 +0100
    Re: [kernel-hardening] [PATCH v4 0/8] introduce post-init read-only  memory Laura Abbott <laura@labbott.name> - 2016-01-22 20:20 +0100
      Re: [kernel-hardening] [PATCH v4 0/8] introduce post-init read-only memory Kees Cook <keescook@chromium.org> - 2016-01-22 21:00 +0100
        Re: [kernel-hardening] [PATCH v4 0/8] introduce post-init read-only memory Geert Uytterhoeven <geert@linux-m68k.org> - 2016-01-23 10:50 +0100

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