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From: Herbert Xu <herbert@gondor.apana.org.au>
To: kernel test robot <lkp@intel.com>,
	Peter Oberparleiter <oberpar@linux.ibm.com>,
	Kees Cook <keescook@chromium.org>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ard Biesheuvel <ardb@kernel.org>,
	kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>
Subject: Re: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes
Date: Thu, 27 Aug 2020 18:05:58 +1000	[thread overview]
Message-ID: <20200827080558.GA3024@gondor.apana.org.au> (raw)
In-Reply-To: <202008271145.xE8qIAjp%lkp@intel.com>

On Thu, Aug 27, 2020 at 11:52:50AM +0800, kernel test robot wrote:
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   15bc20c6af4ceee97a1f90b43c0e386643c071b4
> commit: 5fb8ef25803ef33e2eb60b626435828b937bed75 crypto: chacha - move existing library code into lib/crypto
> date:   9 months ago
> config: i386-randconfig-r015-20200827 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> reproduce (this is a W=1 build):
>         git checkout 5fb8ef25803ef33e2eb60b626435828b937bed75
>         # save the attached .config to linux build tree
>         make W=1 ARCH=i386 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    lib/crypto/chacha.c: In function 'chacha_permute':
> >> lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>       65 | }
>          | ^

This doesn't happen with a normal configuration.  To recreate
this warning, you need to enable both GCOV_KERNEL and UBSAN.

This is the minimal gcc command-line to recreate it:

gcc -Wframe-larger-than=1024 -fprofile-arcs -fsanitize=object-size -c -O2 chacha.c

If you take away either profile-arcs or sanitize=object-size then
the problem goes away.

Any suggestions?

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2020-08-27  8:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-27  3:52 lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes kernel test robot
2020-08-27  8:05 ` Herbert Xu [this message]
2020-08-27  8:10   ` Ard Biesheuvel
2020-08-27  8:24     ` Herbert Xu
2020-08-27 17:34       ` Linus Torvalds
2020-08-27 17:55         ` Linus Torvalds
2020-08-27 18:42           ` Kees Cook
2020-08-27 19:02             ` Linus Torvalds
2020-08-27 19:32               ` Kees Cook
2020-08-27 19:11           ` Arnd Bergmann
2020-08-27 19:34             ` Kees Cook
2020-08-27 20:08             ` Linus Torvalds
2020-08-27  8:33     ` Arnd Bergmann
2020-08-27  8:42       ` Ard Biesheuvel
2020-08-27  9:19         ` Arnd Bergmann
2020-08-27 10:41           ` Ard Biesheuvel
2020-08-27 11:51             ` Herbert Xu
2020-08-27 16:25               ` Arnd Bergmann
2020-09-19 17:27 kernel test robot
2020-10-18 19:13 kernel test robot
2020-10-19 15:47 ` Joe Perches
2020-10-20  8:00   ` David Laight
2020-10-20 10:13     ` Joe Perches

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