lkml.org 
[lkml]   [2019]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [for-next][PATCH 12/16] kprobes: Initialize kprobes at postcore_initcall
Hi Steve,

On Tue, Jul 09, 2019 at 11:15:20AM -0400, Steven Rostedt wrote:
> On Wed, 3 Jul 2019 15:08:32 +0100
> Catalin Marinas <catalin.marinas@arm.com> wrote:
> > > diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> > > index 5471efbeb937..0ca6f53c8505 100644
> > > --- a/kernel/kprobes.c
> > > +++ b/kernel/kprobes.c
> > > @@ -2235,6 +2235,8 @@ static struct notifier_block kprobe_module_nb = {
> > > extern unsigned long __start_kprobe_blacklist[];
> > > extern unsigned long __stop_kprobe_blacklist[];
> > >
> > > +static bool run_kprobe_tests __initdata;
> > > +
> > > static int __init init_kprobes(void)
> > > {
> > > int i, err = 0;
> > > @@ -2286,11 +2288,18 @@ static int __init init_kprobes(void)
> > > kprobes_initialized = (err == 0);
> > >
> > > if (!err)
> > > - init_test_probes();
> > > + run_kprobe_tests = true;
> > > return err;
> > > }
> > > subsys_initcall(init_kprobes);
> > >
> > > +static int __init run_init_test_probes(void)
> > > +{
> > > + if (run_kprobe_tests)
> > > + init_test_probes();
> >
> > A return 0 here.
> >
> > > +}
> > > +module_init(run_init_test_probes);
> >
> > This does the trick. I prefer your fix as it leaves the arch code
> > unchanged. In case you need it:
>
> And I actually think yours is better for the opposite reason ;-)
>
> I agree with Masami, that the selftest actually caught a bug here. I
> think the arch code may need to change as the purpose of Masami's
> changes was to enable kprobes earlier in boot. The selftest failing
> means that an early kprobe will fail too.

I just got back from holiday and catching up with emails. Do I still
need to merge the arm64 fix making the debug initialisation a
core_initcall()?

Can we actually get kprobes invoked before init_kprobes() has been
called?

Thanks.

--
Catalin

\
 
 \ /
  Last update: 2019-07-22 14:43    [W:0.105 / U:9.516 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site