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

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Message-ID: <CAMuHMdXfn6YuG9imLKd5nEdxhT4gWu-V8bn1LRt+M3bESaUAkA@mail.gmail.com>
Date:   Tue, 26 Jun 2018 12:33:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stephan Mueller <smueller@...onox.de>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: cryptomgr_test / drbg_ctr: BUG: sleeping function called from
 invalid context

Hi Stephan,

On Sun, May 20, 2018 at 9:54 PM Stephan Müller <smueller@...onox.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@...ux-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