Re: random: treat bootloader trust toggle the same way as cpu trust toggle

Re: random: treat bootloader trust toggle the same way as cpu trust toggle

[Sedat Dilek]

[ Unsure which ML to CC - see [1] - so I used what was CCed in [3]]

Hi,

I am not a security expert but following the exciting changes to
random/crng changes in upcoming v5.18 and using it on top of Linux
v5.17.

Just saw this typo in [0]:

diff --git a/Documentation/admin-guide/kernel-parameters.txt
b/Documentation/admin-guide/kernel-parameters.txt
index c658e5d2d52c9..b9d764a492078 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4400,6 +4400,12 @@
  fully seed the kernel's CRNG. Default is controlled
  by CONFIG_RANDOM_TRUST_CPU.

+ random.trust_bootloader={on,off}
+ [KNL] Enable or disable trusting the use of the
+ a seed passed by the bootloader (if available) to

What do you want to say: "the" or "a" seed :-)?

+ fully seed the kernel's CRNG. Default is controlled
+ by CONFIG_RANDOM_TRUST_BOOTLOADER.
+
  randomize_kstack_offset=
  [KNL] Enable or disable kernel stack offset
  randomization, which provides roughly 5 bits of

Thanks for your work!

Regards,
- Sedat -

[0] https://git.kernel.org/pub/scm/linux/kernel/git/crng/random.git/commit/?id=3032aedb16c77747f6a97d216887daec2b44f273
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAINTAINERS#n16315
[2] https://www.zx2c4.com/projects/linux-rng-5.17-5.18/
[3] https://marc.info/?t=164797651800005&r=1&w=2

Re: random: treat bootloader trust toggle the same way as cpu trust toggle

[Jason A. Donenfeld]

Hi Sedat,

On Fri, Mar 25, 2022 at 5:46 AM Sedat Dilek <sedat.dilek@gmail.com> wrote:
> I am not a security expert but following the exciting changes to
> random/crng changes in upcoming v5.18 and using it on top of Linux
> v5.17.
>
> Just saw this typo in [0]:

Thanks. Will fix a the bug.

Jason