linux-kernel - Re: [PATCH v3 02/11] arm64: Make use of is_compat

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Message-ID: <1f63cf5a-6bbe-fa55-75c0-20322d8a7f36@ghiti.fr>
Date:   Thu, 18 Apr 2019 01:23:38 -0400
From:   Alex Ghiti <alex@...ti.fr>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Luis Chamberlain <mcgrof@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v3 02/11] arm64: Make use of is_compat_task instead of
 hardcoding this test

On 4/18/19 12:32 AM, Kees Cook wrote:
> On Wed, Apr 17, 2019 at 12:25 AM Alexandre Ghiti <alex@...ti.fr> wrote:
>> Each architecture has its own way to determine if a task is a compat task,
>> by using is_compat_task in arch_mmap_rnd, it allows more genericity and
>> then it prepares its moving to mm/.
>>
>> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
> Acked-by: Kees Cook <keescook@...omium.org>


Thanks !


> -Kees
>
>> ---
>>   arch/arm64/mm/mmap.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
>> index 842c8a5fcd53..ed4f9915f2b8 100644
>> --- a/arch/arm64/mm/mmap.c
>> +++ b/arch/arm64/mm/mmap.c
>> @@ -54,7 +54,7 @@ unsigned long arch_mmap_rnd(void)
>>          unsigned long rnd;
>>
>>   #ifdef CONFIG_COMPAT
>> -       if (test_thread_flag(TIF_32BIT))
>> +       if (is_compat_task())
>>                  rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1);
>>          else
>>   #endif
>> --
>> 2.20.1
>>
>