Re: [PATCH 3/6] riscv: re-randomize rng-seed on reboot

[Alistair Francis]

On Fri, Sep 30, 2022 at 9:24 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> When the system reboots, the rng-seed that the FDT has should be
> re-randomized, so that the new boot gets a new seed. Since the FDT is in
> the ROM region at this point, we add a hook right after the ROM has been
> added, so that we have a pointer to that copy of the FDT.
>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Alistair Francis <alistair.francis@wdc.com>
> Cc: Bin Meng <bin.meng@windriver.com>
> Cc: qemu-riscv@nongnu.org
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  hw/riscv/boot.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
> index 1ae7596873..aaecf21543 100644
> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -30,6 +30,7 @@
>  #include "sysemu/device_tree.h"
>  #include "sysemu/qtest.h"
>  #include "sysemu/kvm.h"
> +#include "sysemu/reset.h"
>
>  #include <libfdt.h>
>
> @@ -241,6 +242,8 @@ uint64_t riscv_load_fdt(hwaddr dram_base, uint64_t 
> mem_size, void *fdt)
>
>      rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr,
>                            &address_space_memory);
> +    qemu_register_reset(qemu_fdt_randomize_seeds,
> +                        rom_ptr_for_as(&address_space_memory, fdt_addr, 
> fdtsize));
>
>      return fdt_addr;
>  }
> --
> 2.37.3
>
>