Re: [PATCH v1] seccomp: Release filter when copy_process() fails.

[kernel test robot <lkp@intel.com>]

Hi Kuniyuki,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kees/for-next/pstore]
[also build test ERROR on linus/master v6.0-rc3]
[cannot apply to kees/for-next/seccomp next-20220901]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kuniyuki-Iwashima/seccomp-Release-filter-when-copy_process-fails/20220823-044710
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/pstore
config: arc-randconfig-r043-20220901 (https://download.01.org/0day-ci/archive/20220902/202209021116.hpxQOERU-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/ea0fdd2f2e9a09bd5428bd59e81bac66e949f578
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kuniyuki-Iwashima/seccomp-Release-filter-when-copy_process-fails/20220823-044710
        git checkout ea0fdd2f2e9a09bd5428bd59e81bac66e949f578
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   kernel/fork.c:163:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes]
     163 | void __weak arch_release_task_struct(struct task_struct *tsk)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/arc/include/asm/bug.h:30,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:15,
                    from kernel/fork.c:16:
   kernel/fork.c: In function 'free_task':
>> kernel/fork.c:540:34: error: 'struct seccomp' has no member named 'filter'
     540 |         WARN_ON_ONCE(tsk->seccomp.filter);
         |                                  ^
   include/asm-generic/bug.h:166:32: note: in definition of macro 'WARN_ON'
     166 |         int __ret_warn_on = !!(condition);                              \
         |                                ^~~~~~~~~
   kernel/fork.c:540:9: note: in expansion of macro 'WARN_ON_ONCE'
     540 |         WARN_ON_ONCE(tsk->seccomp.filter);
         |         ^~~~~~~~~~~~
   kernel/fork.c: At top level:
   kernel/fork.c:854:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes]
     854 | void __init __weak arch_task_cache_init(void) { }
         |                    ^~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:949:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
     949 | int __weak arch_dup_task_struct(struct task_struct *dst,
         |            ^~~~~~~~~~~~~~~~~~~~


vim +540 kernel/fork.c

   537	
   538	void free_task(struct task_struct *tsk)
   539	{
 > 540		WARN_ON_ONCE(tsk->seccomp.filter);
   541		release_user_cpus_ptr(tsk);
   542		scs_release(tsk);
   543	

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