Thanks Adam for your prompt response!
On Tue, 4 Feb 2025, 22:16 Adam Lackorzynski, wrote:
> Hi,
>
> On Tue Feb 04, 2025 at 21:59:24 +0200, Flavio Erlich wrote:
> > Hi,
> >
> > According to Linux documentation, if I want to use kASLR I should add on
> my
> > device tree, on the chosen node a kaslr-seed entry (
> > https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt
> ).
> > I'm running uvmm and I want to use the dt-modify argument to change the
> > value on dtb to a value that comes from an HW random generator at
> runtime.
> > I have written an application which reads a random sequence from the HW.
> > How can I pass the random value from that application and pass the u64
> > value to the ned script which I can use as a seed?
> > I can use the application exit code to read 32-bit and run it twice, but
> > seems to be overkill to do that.
> > I was thinking of sending a newer allocatted Dataspace to the
> application,
> > it will fill it with random data, but I have no idea if it is possible to
> > read this Dataspace and concatenate the result to the arguments to uvmm.
> > Do you have any other suggestions?
>
> Just give uvmm a 'rng' capability talking L4Re::Random protocol and it
> will update the kaslr-seed value in the DT itself. For that your program
> will need to implement a L4Re::Random server.
>
>
>
> Adam
>
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