diff mbox series

[v2,5/8] rx: re-randomize rng-seed on reboot

Message ID 20221011204645.1160916-6-Jason@zx2c4.com
State New
Headers show
Series rerandomize RNG seeds on reboot and handle record&replay | expand

Commit Message

Jason A. Donenfeld Oct. 11, 2022, 8:46 p.m. UTC
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: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 hw/rx/rx-gdbsim.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Yoshinori Sato Oct. 17, 2022, 1:50 p.m. UTC | #1
On Wed, 12 Oct 2022 05:46:42 +0900,
Jason A. Donenfeld 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: Yoshinori Sato <ysato@users.sourceforge.jp>
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
> ---
>  hw/rx/rx-gdbsim.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/hw/rx/rx-gdbsim.c b/hw/rx/rx-gdbsim.c
> index 8ffe1b8035..198d048964 100644
> --- a/hw/rx/rx-gdbsim.c
> +++ b/hw/rx/rx-gdbsim.c
> @@ -25,6 +25,7 @@
>  #include "hw/rx/rx62n.h"
>  #include "sysemu/qtest.h"
>  #include "sysemu/device_tree.h"
> +#include "sysemu/reset.h"
>  #include "hw/boards.h"
>  #include "qom/object.h"
>  
> @@ -148,6 +149,8 @@ static void rx_gdbsim_init(MachineState *machine)
>              dtb_offset = ROUND_DOWN(machine->ram_size - dtb_size, 16);
>              rom_add_blob_fixed("dtb", dtb, dtb_size,
>                                 SDRAM_BASE + dtb_offset);
> +            qemu_register_reset(qemu_fdt_randomize_seeds,
> +                                rom_ptr(SDRAM_BASE + dtb_offset, dtb_size));
>              /* Set dtb address to R1 */
>              RX_CPU(first_cpu)->env.regs[1] = SDRAM_BASE + dtb_offset;
>          }
> -- 
> 2.37.3
> 

Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
diff mbox series

Patch

diff --git a/hw/rx/rx-gdbsim.c b/hw/rx/rx-gdbsim.c
index 8ffe1b8035..198d048964 100644
--- a/hw/rx/rx-gdbsim.c
+++ b/hw/rx/rx-gdbsim.c
@@ -25,6 +25,7 @@ 
 #include "hw/rx/rx62n.h"
 #include "sysemu/qtest.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/reset.h"
 #include "hw/boards.h"
 #include "qom/object.h"
 
@@ -148,6 +149,8 @@  static void rx_gdbsim_init(MachineState *machine)
             dtb_offset = ROUND_DOWN(machine->ram_size - dtb_size, 16);
             rom_add_blob_fixed("dtb", dtb, dtb_size,
                                SDRAM_BASE + dtb_offset);
+            qemu_register_reset(qemu_fdt_randomize_seeds,
+                                rom_ptr(SDRAM_BASE + dtb_offset, dtb_size));
             /* Set dtb address to R1 */
             RX_CPU(first_cpu)->env.regs[1] = SDRAM_BASE + dtb_offset;
         }