linux-kernel - Re: [PATCH V10] fixup: audit: implement audit by executable

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Date:	Mon, 10 Aug 2015 12:22:15 -0400
From:	Paul Moore <pmoore@...hat.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	sgrubb@...hat.com, eparis@...hat.com, peter@...3.com
Subject: Re: [PATCH V10] fixup: audit: implement audit by executable

On Saturday, August 08, 2015 10:20:25 AM Richard Guy Briggs wrote:
> diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
> index 1255dbf..656c7e9 100644
> --- a/kernel/audit_watch.c
> +++ b/kernel/audit_watch.c
> @@ -540,8 +540,14 @@ int audit_dupe_exe(struct audit_krule *new, struct
> audit_krule *old)
> 
>  int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark
> *mark) {
> -	unsigned long ino = tsk->mm->exe_file->f_inode->i_ino;
> -	dev_t dev = tsk->mm->exe_file->f_inode->i_sb->s_dev;
> -
> +	struct file *exe_file;
> +	unsigned long ino;
> +	dev_t dev;
> +
> +	rcu_read_lock();
> +	exe_file = rcu_dereference(tsk->mm->exe_file);

This line is triggering a sparse error on my system:

 # make C=1 M=kernel
 ...
   CHECK   kernel/audit_watch.c
 kernel/audit_watch.c:548:20: error: incompatible types in comparison  
 expression (different address spaces)

For the record I'm using gcc v4.9.3 and sparse v0.5.0.

> +	ino = exe_file->f_inode->i_ino;
> +	dev = exe_file->f_inode->i_sb->s_dev;
> +	rcu_read_unlock();
>  	return audit_mark_compare(mark, ino, dev);
>  }

-- 
paul moore
security @ redhat

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