On Thu, Dec 14, 2023 at 01:50:05PM -0800, Kees Cook wrote:
> 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-...@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-...@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 <l...@intel.com>
> > | Closes:
> > https://lore.kernel.org/oe-kbuild-all/202312150432.obngc94a-...@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...
This is triggered by W=1 build
make W=1 O=build_dir ARCH=i386 olddefconfig
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/gcov/
The detail step is at [1], hope it can help reproduce the issue
[1]
https://download.01.org/0day-ci/archive/20231215/202312150432.obngc94a-...@intel.com/reproduce
>
> --
> Kees Cook
>
