[v2] rerandomize RNG seeds on reboot and handle record&replay

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

Jason A. Donenfeld posted 8 patches 3 years, 4 months ago

Diff against v3 v4
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Maintainers: "Cédric Le Goater" <clg@kaod.org>, Peter Maydell <peter.maydell@linaro.org>, Andrew Jeffery <andrew@aj.id.au>, Joel Stanley <joel@jms.id.au>, Richard Henderson <richard.henderson@linaro.org>, Helge Deller <deller@gmx.de>, Sergio Lopez <slp@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Eduardo Habkost <eduardo@habkost.net>, Paul Burton <paulburton@kernel.org>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, Stafford Horne <shorne@gmail.com>, BALATON Zoltan <balaton@eik.bme.hu>, Daniel Henrique Barboza <danielhb413@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Greg Kurz <groug@kaod.org>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, David Hildenbrand <david@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Cornelia Huck <cohuck@redhat.com>, Thomas Huth <thuth@redhat.com>, Yanan Wang <wangyanan55@huawei.com>, Juan Quintela <quintela@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>

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

Posted by Jason A. Donenfeld 3 years, 4 months ago

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

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

Posted by Yoshinori Sato 3 years, 3 months ago

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>

-- 
Yosinori Sato