lkml.org 
[lkml]   [2020]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 2/9] livepatch: Apply vmlinux-specific KLP relocations early
On Mon, Apr 20, 2020 at 02:11:17PM -0500, Josh Poimboeuf wrote:
> On Mon, Apr 20, 2020 at 03:01:41PM -0400, Joe Lawrence wrote:
> > > > ... apply_relocations() is also iterating over the section headers (the
> > > > diff context doesn't show it here, but i is an incrementing index over
> > > > sechdrs[]).
> > > >
> > > > So if there is more than one KLP relocation section, we'll process them
> > > > multiple times. At least the x86 relocation code will detect this and
> > > > fail the module load with an invalid relocation (existing value not
> > > > zero).
> > >
> > > Ah, yes, good catch!
> > >
> >
> > The same test case passed with a small modification to push the foreach
> > KLP section part to a kernel/livepatch/core.c local function and
> > exposing the klp_resolve_symbols() + apply_relocate_add() for a given
> > section to kernel/module.c. Something like following...
>
> I came up with something very similar, though I named them
> klp_apply_object_relocs() and klp_apply_section_relocs() and changed the
> argument order a bit (module first). Since it sounds like you have a
> test, could you try this one?
>

LGTM. I have a few klp-convert selftests that I've been slowly
tinkering on and they all load/run successfully with this version. :)

-- Joe

\
 
 \ /
  Last update: 2020-04-20 21:50    [W:0.188 / U:0.696 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site