linux-hardening - Re: kernel/gcov/fs.c:103: warning: Excess struct member 'buffer' description in 'gcov

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Date: Thu, 14 Dec 2023 13:50:05 -0800
From: Kees Cook <keescook@...omium.org>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Peter Oberparleiter <oberpar@...ux.ibm.com>,
	linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: kernel/gcov/fs.c:103: warning: Excess struct member 'buffer'
 description in 'gcov_iterator'

On Fri, Dec 15, 2023 at 04:53:19AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd
> commit: fbd126f5a658b92c7f6af986a6d89cf5e5693268 gcov: annotate struct gcov_iterator with __counted_by
> date:   8 weeks ago
> config: i386-buildonly-randconfig-001-20231214 (https://download.01.org/0day-ci/archive/20231215/202312150432.oBngC94A-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231215/202312150432.oBngC94A-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202312150432.oBngC94A-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> kernel/gcov/fs.c:103: warning: Excess struct member 'buffer' description in 'gcov_iterator'
> 
> 
> vim +103 kernel/gcov/fs.c
> 
> 7a1d55b987dfcb Johannes Berg 2021-05-06   90  
> 7a1d55b987dfcb Johannes Berg 2021-05-06   91  /**
> 7a1d55b987dfcb Johannes Berg 2021-05-06   92   * struct gcov_iterator - specifies current file position in logical records
> 7a1d55b987dfcb Johannes Berg 2021-05-06   93   * @info: associated profiling data
> 7a1d55b987dfcb Johannes Berg 2021-05-06   94   * @buffer: buffer containing file data
> 7a1d55b987dfcb Johannes Berg 2021-05-06   95   * @size: size of buffer
> 7a1d55b987dfcb Johannes Berg 2021-05-06   96   * @pos: current position in file
> 7a1d55b987dfcb Johannes Berg 2021-05-06   97   */
> 7a1d55b987dfcb Johannes Berg 2021-05-06   98  struct gcov_iterator {
> 7a1d55b987dfcb Johannes Berg 2021-05-06   99  	struct gcov_info *info;
> 7a1d55b987dfcb Johannes Berg 2021-05-06  100  	size_t size;
> 7a1d55b987dfcb Johannes Berg 2021-05-06  101  	loff_t pos;
> fbd126f5a658b9 Kees Cook     2023-09-22  102  	char buffer[] __counted_by(size);
> 7a1d55b987dfcb Johannes Berg 2021-05-06 @103  };
> 7a1d55b987dfcb Johannes Berg 2021-05-06  104  

It looks like whatever produces that error is not parsing attributes
correctly. I suspect this is the "htmldocs" target and "__counted_by" is
missing from Documentation/conf.py. I'll investigate...

-- 
Kees Cook