Re: cryptomgr_test / drbg_ctr: BUG: sleeping function called from invalid context

Geert Uytterhoeven
2018-06-26T10:34:05Z

Hi Stephan,

On Sun, May 20, 2018 at 9:54 PM Stephan Müller <smueller@chronox.de> wrote:
> Am Freitag, 18. Mai 2018, 10:36:04 CEST schrieb Geert Uytterhoeven:
> > I tried following the code path, but couldn't find where it went wrong.
> >
> > mutex_lock(&drbg->drbg_mutex) is called from drbg_instantiate(), which is
> > inlined by the compiler into drbg_kcapi_seed().
> >
> > Do you have a clue?
>
> It is the first time I hear from such an issue. Yes, the DRBG should not be
> called in atomic context. But I do not see where we have an atomic context
> (either a spin_lock or in an interrupt handler) when we are executing the test
> manager.
>
> I will keep looking.

Issue is gone. I assume due to commit 6e88f01206edab0e ("crypto: arm64/aes-blk
- fix and move skcipher_walk_done out of kernel_neon_begin, _end").

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds