linux-kernel - Re: [PATCH ALT4] audit: show fstype:pathname for entries with anonymous parents

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Date:   Thu, 2 Mar 2017 20:58:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-audit@...hat.com, Richard Guy Briggs <rgb@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Eric Paris <eparis@...hat.com>, Paul Moore <pmoore@...hat.com>,
        Steve Grubb <sgrubb@...hat.com>
Subject: Re: [PATCH ALT4] audit: show fstype:pathname for entries with
 anonymous parents

Hi Richard,

[auto build test WARNING on pcmoore-audit/next]
[also build test WARNING on v4.10 next-20170302]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Richard-Guy-Briggs/audit-show-fstype-pathname-for-entries-with-anonymous-parents/20170302-200143
base:   git://git.infradead.org/users/pcmoore/audit next
config: i386-defconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   kernel/auditsc.c: In function '__audit_inode_child':
>> kernel/auditsc.c:1920:27: warning: passing argument 1 of 'dget_parent' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      n->dentry = dget_parent(dentry);
                              ^~~~~~
   In file included from include/linux/fs.h:7:0,
                    from kernel/auditsc.c:50:
   include/linux/dcache.h:322:23: note: expected 'struct dentry *' but argument is of type 'const struct dentry *'
    extern struct dentry *dget_parent(struct dentry *dentry);
                          ^~~~~~~~~~~
>> kernel/auditsc.c:1943:30: warning: passing argument 1 of 'dget' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      found_child->dentry = dget(dentry);
                                 ^~~~~~
   In file included from include/linux/fs.h:7:0,
                    from kernel/auditsc.c:50:
   include/linux/dcache.h:315:30: note: expected 'struct dentry *' but argument is of type 'const struct dentry *'
    static inline struct dentry *dget(struct dentry *dentry)
                                 ^~~~

vim +1920 kernel/auditsc.c

  1914		if (!found_parent) {
  1915			/* create a new, "anonymous" parent record */
  1916			n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
  1917			if (!n)
  1918				return;
  1919			audit_copy_inode(n, NULL, parent);
> 1920			n->dentry = dget_parent(dentry);
  1921		}
  1922	
  1923		if (!found_child) {
  1924			found_child = audit_alloc_name(context, type);
  1925			if (!found_child)
  1926				return;
  1927	
  1928			/* Re-use the name belonging to the slot for a matching parent
  1929			 * directory. All names for this context are relinquished in
  1930			 * audit_free_names() */
  1931			if (found_parent) {
  1932				found_child->name = found_parent->name;
  1933				found_child->name_len = AUDIT_NAME_FULL;
  1934				found_child->name->refcnt++;
  1935			}
  1936		}
  1937	
  1938		if (inode)
  1939			audit_copy_inode(found_child, dentry, inode);
  1940		else
  1941			found_child->ino = AUDIT_INO_UNSET;
  1942		if (!found_parent)
> 1943			found_child->dentry = dget(dentry);
  1944	}
  1945	EXPORT_SYMBOL_GPL(__audit_inode_child);
  1946	

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