linux-kernel - Re: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes

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Message-ID: <CAHk-=wg2RCgmW_KM8Gf9-3VJW1K2-FTXQsGeGHirBFsG5zPbsg@mail.gmail.com>
Date:   Thu, 27 Aug 2020 10:34:48 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        kernel test robot <lkp@...el.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes
 is larger than 1024 bytes

On Thu, Aug 27, 2020 at 1:25 AM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> Interestingly this particular file fails with those options on
> gcc 8, 9 and 10.

How are you guys testing? I have UBSAN and GCOV on, and don't see
crazy frames on either i386 or x86-64.

I see 72 bytes and 64 bytes respectively for chacha_permute() (plus
the register pushes, which is about the same size)

                  Linus