linux-kernel - Re: [PATCH v1] binfmt_misc: fix crash when load/unload module

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Date:   Mon, 24 Jan 2022 20:14:26 +0800
From:   kernel test robot <lkp@...el.com>
To:     Tong Zhang <ztong0001@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Tong Zhang <ztong0001@...il.com>
Subject: Re: [PATCH v1] binfmt_misc: fix crash when load/unload module

Hi Tong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.17-rc1 next-20220124]
[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]

url:    https://github.com/0day-ci/linux/commits/Tong-Zhang/binfmt_misc-fix-crash-when-load-unload-module/20220124-083500
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
config: arm-randconfig-c002-20220124 (https://download.01.org/0day-ci/archive/20220124/202201242006.cqM8NznF-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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/0day-ci/linux/commit/d649008f3214eb4d94760873831ef5e53c292976
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tong-Zhang/binfmt_misc-fix-crash-when-load-unload-module/20220124-083500
        git checkout d649008f3214eb4d94760873831ef5e53c292976
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   fs/binfmt_misc.c: In function 'init_misc_binfmt':
>> fs/binfmt_misc.c:828:28: error: assignment to 'struct ctl_table_header *' from incompatible pointer type 'struct sysctl_header *' [-Werror=incompatible-pointer-types]
     828 |         binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
         |                            ^
   cc1: some warnings being treated as errors


vim +828 fs/binfmt_misc.c

   821	
   822	static int __init init_misc_binfmt(void)
   823	{
   824		int err = register_filesystem(&bm_fs_type);
   825		if (!err)
   826			insert_binfmt(&misc_format);
   827	
 > 828		binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
   829		if (!binfmt_misc_header) {
   830			pr_warn("Failed to create fs/binfmt_misc sysctl mount point");
   831			return -ENOMEM;
   832		}
   833		return 0;
   834	}
   835	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org