linux-hardening - Re: [BUG] missing return thunk: __ret+0x5/0x7e-_

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Date:   Fri, 25 Aug 2023 00:15:12 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        x86@...nel.org, peterz@...radead.org, keescook@...omium.org,
        elver@...gle.com, dvyukov@...gle.com, glider@...gle.com
Subject: Re: [BUG] missing return thunk: __ret+0x5/0x7e-__ret+0x0/0x7e: e9 f6
 ff ff ff

On Fri, Aug 25, 2023 at 08:33:02AM +0200, Borislav Petkov wrote:
> On Thu, Aug 24, 2023 at 03:52:56PM +0200, Greg KH wrote:
> > On Wed, Aug 16, 2023 at 08:17:20PM +0200, Borislav Petkov wrote:
> > > Hey Paul,
> > > 
> > > On Wed, Aug 16, 2023 at 10:54:09AM -0700, Paul E. McKenney wrote:
> > > > I hit the splat at the end of this message in recent mainline, and has
> > > > appeared some time since v6.5-rc1.  Should I be worried?
> > > 
> > > does it go away if you try the latest tip:x86/urgent branch?
> > 
> > Note, this problem is showing up in the 6.1.y branch right now, due to
> > one objtool patch not being able to be backported there easily (i.e. I
> > tried and gave up.)
> > 
> > 4ae68b26c3ab ("objtool/x86: Fix SRSO mess") being the commit that I
> > can't seem to get to work properly, my attempt can be seen here:
> > 	https://lore.kernel.org/r/2023082212-pregnant-lizard-80e0@gregkh
> > 
> > Just a heads up as this will start to affect users of the next 6.1.y
> > release, and probably older releases, as they are taking portions of the
> > "fixes for fixes" but not the above mentioned one.
> 
> Hmm, Peter and I are away, I guess maybe Josh might have an idea how and
> what to backport to 6.1 to get this sorted out...
> 
> CCed.

Sure, will take a look tomorrow.

-- 
Josh