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

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Message-ID: <9ff0f0fa-438a-4019-afa1-4579041405b5@paulmck-laptop>
Date:   Wed, 16 Aug 2023 11:54:08 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     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 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?

That is plausible, given that bisection has narrowed things down to
somewhere between v6.5-rc5 and v6.5-rc6.  And it is quite conveniently
currently on a bad commit.  Sometimes you get lucky.  ;-)

So pulling in those commits from -tip, currently headed by this one:

d80c3c9de067 ("x86/srso: Explain the untraining sequences a bit more")

Then merging them with the current bad commit gets me a successful
run.  Thank you!!!

							Thanx, Paul