From: Ingo Molnar <mingo@kernel.org>
To: hpa@zytor.com
Cc: David Laight <David.Laight@ACULAB.COM>,
"'Alexey Dobriyan'" <adobriyan@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH] x86: pad assembly functions with INT3
Date: Tue, 15 May 2018 08:54:05 +0200 [thread overview]
Message-ID: <20180515065405.GA31240@gmail.com> (raw)
In-Reply-To: <D6F6643E-1206-4D87-B8ED-5FF17C15A0EF@zytor.com>
* hpa@zytor.com <hpa@zytor.com> wrote:
> > I guess it won't try to speculatively execute the 'pad' instructions - but you
> > can never really tell!
> >
> > David
>
> The CPU doesn't speculate down past an unconditional control transfer. Doing so
> would be idiotic.
I think, when it comes to speculative execution, our general expectation that CPUs
don't do idiotic things got somewhat weakened in the past year or so ...
Thanks,
Ingo
next prev parent reply other threads:[~2018-05-15 6:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 21:37 [PATCH] x86: pad assembly functions with INT3 Alexey Dobriyan
2018-05-07 21:41 ` hpa
2018-05-09 16:55 ` Alexey Dobriyan
2018-05-09 19:28 ` H. Peter Anvin
2018-05-10 16:39 ` David Laight
2018-05-11 18:53 ` H. Peter Anvin
2018-05-14 9:04 ` David Laight
2018-05-14 11:05 ` hpa
2018-05-15 6:54 ` Ingo Molnar [this message]
2018-05-15 6:59 ` hpa
2018-05-14 12:53 ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions tip-bot for Alexey Dobriyan
2018-06-17 11:40 ` Mike Galbraith
2018-06-17 12:00 ` Borislav Petkov
2018-06-17 13:38 ` Mike Galbraith
2018-06-17 14:02 ` Mike Galbraith
2018-06-17 19:47 ` Borislav Petkov
2018-06-18 2:34 ` Mike Galbraith
2018-06-23 10:36 ` [PATCH] x86/crypto: Add missing RETs Borislav Petkov
2018-06-23 17:30 ` Ondrej Mosnáček
2018-06-24 7:11 ` Ingo Molnar
2018-06-24 7:12 ` Thomas Gleixner
2018-06-24 10:15 ` Borislav Petkov
2018-06-24 10:44 ` Alexey Dobriyan
2018-06-25 7:24 ` Ingo Molnar
2018-06-25 13:19 ` Josh Poimboeuf
2018-06-26 6:49 ` Ingo Molnar
2018-06-26 12:31 ` Josh Poimboeuf
2018-07-05 7:58 ` Ingo Molnar
2018-07-06 14:06 ` Josh Poimboeuf
2018-07-06 14:57 ` Ingo Molnar
2018-07-01 13:19 ` Herbert Xu
2018-07-01 15:24 ` Ondrej Mosnáček
2018-07-01 15:45 ` Herbert Xu
2018-06-19 11:27 ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions David Laight
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