Re: [PATCH] fsnotify: add generic perm check for unlink/rmdir

[kernel test robot <lkp@xxxxxxxxx>]

Hi Guowei,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pcmoore-selinux/next]
[also build test WARNING on linus/master jmorris-security/next-testing v5.18-rc5]
[cannot apply to jack-fs/fsnotify next-20220503]
[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/intel-lab-lkp/linux/commits/Guowei-Du/fsnotify-add-generic-perm-check-for-unlink-rmdir/20220504-024310
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git next
config: openrisc-buildonly-randconfig-r003-20220501 (https://download.01.org/0day-ci/archive/20220504/202205042136.nn1xy0Ae-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 11.3.0
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/6f635019bbd2ab22a64e03164c8812a46531966e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Guowei-Du/fsnotify-add-generic-perm-check-for-unlink-rmdir/20220504-024310
        git checkout 6f635019bbd2ab22a64e03164c8812a46531966e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=openrisc SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   security/security.c: In function 'security_path_rmdir':
>> security/security.c:1169:35: warning: passing argument 1 of 'fsnotify_path_perm' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    1169 |         return fsnotify_path_perm(dir, dentry, MAY_RMDIR);
         |                                   ^~~
   In file included from security/security.c:24:
   include/linux/fsnotify.h:83:51: note: expected 'struct path *' but argument is of type 'const struct path *'
      83 | static inline int fsnotify_path_perm(struct path *path, struct dentry *dentry, __u32 mask)
         |                                      ~~~~~~~~~~~~~^~~~
   security/security.c: In function 'security_path_unlink':
   security/security.c:1180:35: warning: passing argument 1 of 'fsnotify_path_perm' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    1180 |         return fsnotify_path_perm(dir, dentry, MAY_UNLINK);
         |                                   ^~~
   In file included from security/security.c:24:
   include/linux/fsnotify.h:83:51: note: expected 'struct path *' but argument is of type 'const struct path *'
      83 | static inline int fsnotify_path_perm(struct path *path, struct dentry *dentry, __u32 mask)
         |                                      ~~~~~~~~~~~~~^~~~


vim +1169 security/security.c

  1160	
  1161	int security_path_rmdir(const struct path *dir, struct dentry *dentry)
  1162	{
  1163		int ret;
  1164		if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
  1165			return 0;
  1166		ret = call_int_hook(path_rmdir, 0, dir, dentry);
  1167		if (ret)
  1168			return ret;
> 1169		return fsnotify_path_perm(dir, dentry, MAY_RMDIR);
  1170	}
  1171	

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