From: Borislav Petkov <bp@suse.de>
To: speck@linutronix.de
Subject: [MODERATED] Re: [patch V2 04/10] MDS basics+ 4
Date: Wed, 20 Feb 2019 19:43:30 +0100 [thread overview]
Message-ID: <20190220184330.GE3304@zn.tnic> (raw)
In-Reply-To: <20190220151400.306266355@linutronix.de>
On Wed, Feb 20, 2019 at 04:07:57PM +0100, speck for Thomas Gleixner wrote:
> Subject: [patch V2 04/10] x86/speculation/mds: Clear CPU buffers on exit to user
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Add a static key which controls the invocation of the CPU buffer clear
> mechanism on exit to user space and add the call into
> prepare_exit_to_usermode() right before actually returning.
>
> Add documentation which kernel to user space transition this covers and
> explain in detail why those which are not mitigated do not need it.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> Documentation/x86/mds.rst | 79 +++++++++++++++++++++++++++++++++++
> arch/x86/entry/common.c | 9 +++
> arch/x86/include/asm/nospec-branch.h | 2
> arch/x86/kernel/cpu/bugs.c | 4 +
> 4 files changed, 93 insertions(+), 1 deletion(-)
>
> --- a/Documentation/x86/mds.rst
> +++ b/Documentation/x86/mds.rst
> @@ -64,3 +64,82 @@ itself are not required because the nece
> data cannot be controlled in a way which allows exploitation from malicious
> user space or VM guests.
>
> +Mitigation points
> +-----------------
> +
> +1. Return to user space
> +^^^^^^^^^^^^^^^^^^^^^^^
> + When transition from kernel to user space the CPU buffers are flushed
transitioning
With that:
Reviewed-by: Borislav Petkov <bp@suse.de>
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2019-02-20 18:43 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-20 15:07 [patch V2 00/10] MDS basics+ 0 Thomas Gleixner
2019-02-20 15:07 ` [patch V2 01/10] MDS basics+ 1 Thomas Gleixner
2019-02-20 16:27 ` [MODERATED] " Borislav Petkov
2019-02-20 16:46 ` Greg KH
2019-02-20 15:07 ` [patch V2 02/10] MDS basics+ 2 Thomas Gleixner
2019-02-20 16:47 ` [MODERATED] " Borislav Petkov
2019-02-20 16:48 ` Greg KH
2019-02-20 15:07 ` [patch V2 03/10] MDS basics+ 3 Thomas Gleixner
2019-02-20 16:54 ` [MODERATED] " mark gross
2019-02-20 16:57 ` Thomas Gleixner
2019-02-20 18:08 ` [MODERATED] " mark gross
2019-02-20 21:40 ` Thomas Gleixner
2019-02-20 17:14 ` [MODERATED] " Borislav Petkov
2019-02-20 21:31 ` Thomas Gleixner
2019-02-21 2:12 ` [MODERATED] " Andrew Cooper
2019-02-21 9:27 ` Peter Zijlstra
2019-02-21 9:33 ` [MODERATED] " Borislav Petkov
2019-02-21 10:04 ` Thomas Gleixner
2019-02-21 10:18 ` [MODERATED] Re: " Borislav Petkov
2019-02-20 15:07 ` [patch V2 04/10] MDS basics+ 4 Thomas Gleixner
2019-02-20 16:52 ` [MODERATED] " Greg KH
2019-02-20 17:10 ` mark gross
2019-02-21 19:26 ` [MODERATED] Encrypted Message Tim Chen
2019-02-21 20:32 ` Thomas Gleixner
2019-02-21 21:07 ` [MODERATED] " Jiri Kosina
2019-02-20 18:43 ` Borislav Petkov [this message]
2019-02-20 19:26 ` [MODERATED] Re: [patch V2 04/10] MDS basics+ 4 Jiri Kosina
2019-02-20 21:42 ` Thomas Gleixner
2019-02-20 15:07 ` [patch V2 05/10] MDS basics+ 5 Thomas Gleixner
2019-02-20 20:05 ` [MODERATED] " Borislav Petkov
2019-02-21 2:24 ` Andrew Cooper
2019-02-21 10:36 ` Thomas Gleixner
2019-02-21 11:22 ` Thomas Gleixner
2019-02-21 11:51 ` [MODERATED] Attack Surface [Was [patch V2 05/10] MDS basics+ 5] Andrew Cooper
2019-02-21 18:41 ` Thomas Gleixner
2019-02-20 15:07 ` [patch V2 06/10] MDS basics+ 6 Thomas Gleixner
2019-02-21 10:18 ` [MODERATED] " Borislav Petkov
2019-02-20 15:08 ` [patch V2 07/10] MDS basics+ 7 Thomas Gleixner
2019-02-21 12:47 ` [MODERATED] " Borislav Petkov
2019-02-21 13:48 ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 08/10] MDS basics+ 8 Thomas Gleixner
2019-02-21 14:04 ` [MODERATED] " Borislav Petkov
2019-02-21 14:11 ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 09/10] MDS basics+ 9 Thomas Gleixner
2019-02-20 16:21 ` [MODERATED] " Peter Zijlstra
2019-02-20 22:32 ` Thomas Gleixner
2019-02-20 22:50 ` [MODERATED] " Jiri Kosina
2019-02-20 23:22 ` Thomas Gleixner
2019-02-21 11:04 ` [MODERATED] " Peter Zijlstra
2019-02-21 11:50 ` Peter Zijlstra
2019-02-21 14:18 ` Borislav Petkov
2019-02-21 18:00 ` Kees Cook
2019-02-21 19:46 ` Thomas Gleixner
2019-02-21 20:56 ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 10/10] MDS basics+ 10 Thomas Gleixner
2019-02-22 16:05 ` [MODERATED] Re: [patch V2 00/10] MDS basics+ 0 mark gross
2019-02-22 17:12 ` Thomas Gleixner
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