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SubjectRe: linux-next: Tree for Mar 18 (objtool)
On Thu, Mar 26, 2020 at 11:36:10AM -0700, Kees Cook wrote:
> On Thu, Mar 26, 2020 at 11:31:10AM -0500, Josh Poimboeuf wrote:
> > On Wed, Mar 25, 2020 at 10:57:02PM -0700, Kees Cook wrote:
> > > > In the meantime I can still change objtool to ignore unreachable UD2s if
> > > > there aren't any better ideas.
> > >
> > > It'll still need the objtool change for CONFIG_UBSAN_TRAP, though based on
> > > the clang bug discussion, I'll probably _also_ be adding CONFIG_UBSAN_WARN
> > > which won't have an unreachable (and won't bloat the kernel). Testing
> > > still under way... it is possible that CONFIG_UBSAN_TRAP will go away
> > > in the future, though. If that happens, should I also remove the change
> > > at that time?
> >
> > I'll go ahead and make the patch and post it soon. It should be pretty
> > trivial. We can always revert it if CONFIG_UBSAN_TRAP goes away.
>
> Awesome, thanks very much. After digging into the WARN-style option,
> it seems that TRAP is unlikely to go away because it's Clang only;
> GCC doesn't support the "minimal runtime" option. Yay compilers.

Oh well...

> Anyway, I'll still get the WARN mode sent out. Thanks for looking at this;
> can you CC me on the patch? I'm trying to get more familiar with objtool
> so I don't have to bug you when objtool is angered by crazy stuff I do. ;)

Will do. I know objtool tends to get in the way of adding cool features
sometimes. More eyes on the objtool code are definitely welcome.

--
Josh

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