linux-kernel - Re: [PATCH] security: select correct default LSM_MMAP_MIN

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Date:	Wed, 5 Feb 2014 04:27:17 -0500
From:	Eric Paris <eparis@...isplace.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Colin Cross <ccross@...roid.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	James Morris <james.l.morris@...cle.com>,
	"open list:SECURITY SUBSYSTEM" 
	<linux-security-module@...r.kernel.org>
Subject: Re: [PATCH] security: select correct default LSM_MMAP_MIN_ADDR on arm
 on arm64

Acked-by: Eric Paris <eparis@...hat.com>

On Tue, Feb 4, 2014 at 4:38 AM, Will Deacon <will.deacon@....com> wrote:
> On Tue, Feb 04, 2014 at 02:15:32AM +0000, Colin Cross wrote:
>> Binaries compiled for arm may run on arm64 if CONFIG_COMPAT is
>> selected.  Set LSM_MMAP_MIN_ADDR to 32768 if ARM64 && COMPAT to
>> prevent selinux failures launching 32-bit static executables that
>> are mapped at 0x8000.
>>
>> Signed-off-by: Colin Cross <ccross@...roid.com>
>> ---
>>  security/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/security/Kconfig b/security/Kconfig
>> index e9c6ac724fef..beb86b500adf 100644
>> --- a/security/Kconfig
>> +++ b/security/Kconfig
>> @@ -103,7 +103,7 @@ config INTEL_TXT
>>  config LSM_MMAP_MIN_ADDR
>>       int "Low address space for LSM to protect from user allocation"
>>       depends on SECURITY && SECURITY_SELINUX
>> -     default 32768 if ARM
>> +     default 32768 if ARM || (ARM64 && COMPAT)
>>       default 65536
>>       help
>>         This is the portion of low virtual memory which should be protected
>
> Since ARM64 && COMPAT implies 4k pages, this change looks ok to me.
>
>   Acked-by: Will Deacon <will.deacon@....com>
>
> Will
> --
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