linux-kernel - Re: [PATCH v24 12/12] LRNG - add interface for gathering of raw entropy

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Date:   Wed, 13 Nov 2019 04:55:10 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Stephan Müller <smueller@...onox.de>
Cc:     kbuild-all@...ts.01.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        "Theodore Y. Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Vito Caputo <vcaputo@...garu.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        zhangjs <zachary@...shancloud.com>,
        Andy Lutomirski <luto@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Nicolai Stange <nstange@...e.de>,
        "Peter, Matthias" <matthias.peter@....bund.de>,
        Marcelo Henrique Cerri <marcelo.cerri@...onical.com>,
        Roman Drahtmueller <draht@...altsekun.de>,
        Neil Horman <nhorman@...hat.com>
Subject: Re: [PATCH v24 12/12] LRNG - add interface for gathering of raw
 entropy

Hi "Stephan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on v5.4-rc7 next-20191111]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Stephan-M-ller/dev-random-a-new-approach-with-full-SP800-90B-compliance/20191113-040847
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 01b59c763fe2de845b65900485b141fdd7bbf93e
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=sh 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/char/lrng/lrng_testing.c: In function 'lrng_raw_extract_user':
>> drivers/char/lrng/lrng_testing.c:237:1: warning: the frame size of 1076 bytes is larger than 1024 bytes [-Wframe-larger-than=]
    }
    ^

vim +237 drivers/char/lrng/lrng_testing.c

   196	
   197	/**************************************************************************
   198	 * Debugfs interface
   199	 **************************************************************************/
   200	static int lrng_raw_extract_user(void __user *buf, size_t nbytes)
   201	{
   202		u8 tmp[LRNG_TESTING_RINGBUFFER_SIZE] __aligned(sizeof(u32));
   203		int ret = 0, large_request = (nbytes > 256);
   204	
   205		while (nbytes) {
   206			int i;
   207	
   208			if (large_request && need_resched()) {
   209				if (signal_pending(current)) {
   210					if (ret == 0)
   211						ret = -ERESTARTSYS;
   212					break;
   213				}
   214				schedule();
   215			}
   216	
   217			i = min_t(int, nbytes, sizeof(tmp));
   218			i = lrng_raw_entropy_reader(tmp, i);
   219			if (i <= 0) {
   220				if (i < 0)
   221					ret = i;
   222				break;
   223			}
   224			if (copy_to_user(buf, tmp, i)) {
   225				ret = -EFAULT;
   226				break;
   227			}
   228	
   229			nbytes -= i;
   230			buf = (u8 *)buf + i;
   231			ret += i;
   232		}
   233	
   234		memzero_explicit(tmp, sizeof(tmp));
   235	
   236		return ret;
 > 237	}
   238	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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