linux-kernel - Re: [PATCH] dma-buf: heaps: Set allocation limit for system heap

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Date:   Mon, 2 Aug 2021 19:18:09 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Hridya Valsaraju <hridya@...gle.com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        Christian König <christian.koenig@....com>,
        linux-media <linux-media@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] dma-buf: heaps: Set allocation limit for system heap

On Thu, Jul 22, 2021 at 12:07 PM Hridya Valsaraju <hridya@...gle.com> wrote:
> This patch limits the size of total memory that can be requested in a
> single allocation from the system heap. This would prevent a
> buggy/malicious client from depleting system memory by requesting for an
> extremely large allocation which might destabilize the system.
>
> The limit is set to half the size of the device's total RAM which is the
> same as what was set by the deprecated ION system heap.
>
> Signed-off-by: Hridya Valsaraju <hridya@...gle.com>

Seems sane to me, unless folks have better suggestions for allocation limits.

Reviewed-by: John Stultz <john.stultz@...aro.org>

thanks
-john