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

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Date:   Mon, 24 Jan 2022 19:40:53 +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:     llvm@...ts.linux.dev, 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: riscv-randconfig-r001-20220123 (https://download.01.org/0day-ci/archive/20220124/202201241937.i9KSsyAj-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce)
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
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # 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=clang make.cross W=1 O=build_dir ARCH=riscv 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:828:21: error: incompatible pointer types assigning to 'struct ctl_table_header *' from 'struct sysctl_header *' [-Werror,-Wincompatible-pointer-types]
           binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
                              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 error generated.


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