linux-kernel - Re: [PATCH 2/4] ftrace/instances: Clear function triggers when removing instances

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 16 May 2017 19:31:09 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Shuah Khan <shuah@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/4] ftrace/instances: Clear function triggers when
 removing instances

On 2017/05/15 10:20PM, Steven Rostedt wrote:
> On Sun, 14 May 2017 01:01:02 +0530
> "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:
> 

[snip]

> > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> > index c4536c449021..3f2aed4ad1ed 100644
> > --- a/kernel/trace/trace.c
> > +++ b/kernel/trace/trace.c
> > @@ -7550,6 +7550,7 @@ static int instance_rmdir(const char *name)
> >  	}
> >  
> >  	tracing_set_nop(tr);
> > +	clear_ftrace_function_probes(tr);
> >  	event_trace_del_tracer(tr);
> >  	ftrace_clear_pids(tr);
> >  	ftrace_destroy_function_files(tr);
> > diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> > index 291a1bca5748..98e0845f7235 100644
> > --- a/kernel/trace/trace.h
> > +++ b/kernel/trace/trace.h
> > @@ -980,6 +980,7 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
> >  extern int
> >  unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
> >  				      struct ftrace_probe_ops *ops);
> > +extern void clear_ftrace_function_probes(struct trace_array *tr);
> 
> This needs to have a stub function when CONFIG_DYNAMIC_FTRACE is not
> defined. Otherwise we have:
> 
> kernel/trace/trace.c:7553:2: error: implicit declaration of function 'clear_ftrace_function_probes' [-Werror=implicit-function-declaration]
>   clear_ftrace_function_probes(tr);
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Ah, ok. I'll respin once Masami comments on the other patches.

Thanks,
Naveen