Re: [PATCH V10] fixup: audit: implement audit by executable

On Monday, August 10, 2015 01:29:43 PM Richard Guy Briggs wrote: > On 15/08/10, Paul Moore wrote: > > 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) > > That's odd. I got this complaint when I had forgotten to add the > rcu_dereference() call, but not in its current state. Mind you, I get > swamped with errors and warnings from all over the system (starting with > ptrace.c, signal.c, exit.c, fork.c, audit.c, ftrace.c, > selinux/netnode.c, ...) when I add > "M=kernel" to my build command, so I start to wonder how valid that > result is or that flag. Where is M=kernel documented? I don't remember anymore, it's something I've been using so long that I've forgotten where I first learned of it. The "M=<X>" flag signals that you only want to build a specific module/directory, e.g. M=kernel builds everything under kernel/ whereas M=security/selinux builds everything under security/selinux. So you don't see this error?

paul moore