Re: [PATCH 1/5] security: allow finer granularity in permitting copy-up of security xattrs

[kernel test robot]

Hi Stefan,

kernel test robot noticed the following build errors:

[auto build test ERROR on zohar-integrity/next-integrity]
[also build test ERROR on pcmoore-selinux/next linus/master v6.8-rc2 next-20240131]
[cannot apply to mszeredi-vfs/overlayfs-next mszeredi-vfs/next]
[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/Stefan-Berger/security-allow-finer-granularity-in-permitting-copy-up-of-security-xattrs/20240131-054854
base:   https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git next-integrity
patch link:    https://lore.kernel.org/r/20240130214620.3155380-2-stefanb%40linux.ibm.com
patch subject: [PATCH 1/5] security: allow finer granularity in permitting copy-up of security xattrs
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240201/202402010225.BXp3LrvU-lkp@xxxxxxxxx/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/20240201/202402010225.BXp3LrvU-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402010225.BXp3LrvU-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   security/security.c: In function 'security_inode_copy_up_xattr':
>> security/security.c:2627:40: error: passing argument 1 of 'evm_inode_copy_up_xattr' from incompatible pointer type [-Werror=incompatible-pointer-types]
    2627 |         return evm_inode_copy_up_xattr(src, name);
         |                                        ^~~
         |                                        |
         |                                        struct dentry *
   In file included from security/security.c:24:
   include/linux/evm.h:121:56: note: expected 'const char *' but argument is of type 'struct dentry *'
     121 | static inline int  evm_inode_copy_up_xattr(const char *name)
         |                                            ~~~~~~~~~~~~^~~~
>> security/security.c:2627:16: error: too many arguments to function 'evm_inode_copy_up_xattr'
    2627 |         return evm_inode_copy_up_xattr(src, name);
         |                ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from security/security.c:24:
   include/linux/evm.h:121:20: note: declared here
     121 | static inline int  evm_inode_copy_up_xattr(const char *name)
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/evm_inode_copy_up_xattr +2627 security/security.c

  2596	
  2597	/**
  2598	 * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
  2599	 * @src: union dentry of copy-up file
  2600	 * @name: xattr name
  2601	 *
  2602	 * Filter the xattrs being copied up when a unioned file is copied up from a
  2603	 * lower layer to the union/overlay layer.   The caller is responsible for
  2604	 * reading and writing the xattrs, this hook is merely a filter.
  2605	 *
  2606	 * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
  2607	 *         if the security module does not know about attribute, or a negative
  2608	 *         error code to abort the copy up.
  2609	 */
  2610	int security_inode_copy_up_xattr(struct dentry *src, const char *name)
  2611	{
  2612		struct security_hook_list *hp;
  2613		int rc;
  2614	
  2615		/*
  2616		 * The implementation can return 0 (accept the xattr), 1 (discard the
  2617		 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
  2618		 * any other error code in case of an error.
  2619		 */
  2620		hlist_for_each_entry(hp,
  2621				     &security_hook_heads.inode_copy_up_xattr, list) {
  2622			rc = hp->hook.inode_copy_up_xattr(src, name);
  2623			if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
  2624				return rc;
  2625		}
  2626	
> 2627		return evm_inode_copy_up_xattr(src, name);
  2628	}
  2629	EXPORT_SYMBOL(security_inode_copy_up_xattr);
  2630	

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