linux-kernel - Re: [PATCH] arm64: Always use REFCOUNT

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Message-ID: <CAGXu5jK_2N+VQ43UC6Fi-umcqjVdmpHpPiAf-Qr+4vL9tWRqFg@mail.gmail.com>
Date:   Thu, 21 Sep 2017 10:52:40 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Li Kun <hw.likun@...wei.com>
Subject: Re: [PATCH] arm64: Always use REFCOUNT_FULL

On Thu, Sep 21, 2017 at 10:45 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Wed, Sep 20, 2017 at 01:49:59PM -0700, Kees Cook wrote:
>> As discussed at the Linux Security Summit, arm64 prefers to use
>> REFCOUNT_FULL by default. This enables it for the architecture.
>>
>> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> Cc: hw.likun@...wei.com
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Will Deacon <will.deacon@....com>
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>  arch/arm64/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 0df64a6a56d4..9fe7a7f4c94c 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -119,6 +119,7 @@ config ARM64
>>       select PCI_ECAM if ACPI
>>       select POWER_RESET
>>       select POWER_SUPPLY
>> +     select REFCOUNT_FULL
>
> Umm...  That does a bit more than "on by default", unless I'm
> misreading it.  More like "on, and you can't opt out"...

True, I should rephrase it to say "arm64 maintainers perfer to use
REFCOUNT_FULL unconditionally".

-Kees

-- 
Kees Cook
Pixel Security