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From: Waiman Long <longman@redhat.com>
To: Dave Martin <Dave.Martin@arm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>
Cc: linux-man@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC for SPECULATION_CTRL prctls
Date: Thu, 28 May 2020 09:45:00 -0400	[thread overview]
Message-ID: <35acb48d-6703-bed5-8c6d-739411eea679@redhat.com> (raw)
In-Reply-To: <1590614258-24728-4-git-send-email-Dave.Martin@arm.com>

On 5/27/20 5:17 PM, Dave Martin wrote:
> Add the PR_SPEC_DISABLE_NOEXEC mode added in Linux 5.1
> for the PR_SPEC_STORE_BYPASS "misfeature" of
> PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Cc: Waiman Long <longman@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> ---
>   man2/prctl.2 | 22 ++++++++++++++++++++--
>   1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index b6fb51c..cab9915 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -1187,6 +1187,12 @@ The speculation feature is disabled, mitigation is enabled.
>   Same as
>   .B PR_SPEC_DISABLE
>   but cannot be undone.
> +.TP
> +.BR PR_SPEC_DISABLE_NOEXEC " (since Linux 5.1)"
> +Same as
> +.BR PR_SPEC_DISABLE ,
> +but but the state will be cleared on
> +.BR execve (2).
>   .RE
>   .IP
>   If all bits are 0,
> @@ -1251,6 +1257,17 @@ with the same value for
>   .I arg2
>   will fail with the error
>   .BR EPERM .
> +.\" commit 71368af9027f18fe5d1c6f372cfdff7e4bde8b48
> +.TP
> +.BR PR_SPEC_DISABLE_NOEXEC " (since Linux 5.1)"
> +Same as
> +.BR PR_SPEC_DISABLE ,
> +but but the state will be cleared on
> +.BR execve (2).
> +Currently only supported for
> +.I arg2
> +equal to
> +.B PR_SPEC_STORE_BYPASS.
>   .RE
>   .IP
>   Any unsupported value in
> @@ -1899,11 +1916,12 @@ was
>   .BR PR_SET_SPECULATION_CTRL
>   and
>   .IR arg3
> -is neither
> +is not
>   .BR PR_SPEC_ENABLE ,
>   .BR PR_SPEC_DISABLE ,
> +.BR PR_SPEC_FORCE_DISABLE ,
>   nor
> -.BR PR_SPEC_FORCE_DISABLE .
> +.BR PR_SPEC_DISABLE_NOEXEC .
>   .SH VERSIONS
>   The
>   .BR prctl ()

Acked-by: Waiman Long <longman@redhat.com>


  parent reply	other threads:[~2020-05-28 13:45 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-27 21:17 [PATCH v2 0/6] prctl.2 man page updates for Linux 5.6 Dave Martin
2020-05-27 21:17 ` [PATCH v2 1/6] prctl.2: ffix use literal hyphens when referencing kernel docs Dave Martin
2020-05-28  6:05   ` Michael Kerrisk (man-pages)
2020-05-27 21:17 ` [PATCH v2 2/6] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls Dave Martin
2020-05-28  7:01   ` Michael Kerrisk (man-pages)
2020-06-01 13:51     ` Dave Martin
2020-06-09 11:00       ` Michael Kerrisk (man-pages)
2020-05-27 21:17 ` [PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC " Dave Martin
2020-05-28  6:57   ` Michael Kerrisk (man-pages)
2020-05-28 13:45   ` Waiman Long [this message]
2020-05-27 21:17 ` [PATCH v2 4/6] prctl.2: Add SVE prctls (arm64) Dave Martin
2020-06-09  9:57   ` Will Deacon
2020-06-09 14:11     ` Dave Martin
2020-06-09 14:49       ` Will Deacon
2020-06-10  9:44         ` Dave Martin
2020-06-09 11:39   ` Michael Kerrisk (man-pages)
2020-06-10  9:45     ` Dave Martin
2020-05-27 21:17 ` [PATCH v2 5/6] prctl.2: Add PR_PAC_RESET_KEYS (arm64) Dave Martin
2020-06-09 10:02   ` Will Deacon
2020-06-09 11:03     ` Michael Kerrisk (man-pages)
2020-06-09 11:36   ` Michael Kerrisk (man-pages)
2020-06-09 14:16     ` Dave Martin
2020-06-09 18:11       ` Michael Kerrisk (man-pages)
2020-05-27 21:17 ` [RFC PATCH v2 6/6] prctl.2: Add tagged address ABI control prctls (arm64) Dave Martin
2020-06-09 11:04   ` Michael Kerrisk (man-pages)
2020-06-09 13:38     ` Will Deacon
2020-06-09 17:22   ` Catalin Marinas
2020-06-10 10:06     ` Dave Martin
2020-06-10 15:26       ` Catalin Marinas
2020-06-10 16:42         ` Dave Martin
2020-06-10 17:42           ` Catalin Marinas
2020-06-15 14:51             ` Dave Martin
2020-06-24  9:54               ` Michael Kerrisk (man-pages)
2020-06-24 10:29                 ` Dave Martin
2020-05-28  7:11 ` [PATCH v2 0/6] prctl.2 man page updates for Linux 5.6 Michael Kerrisk (man-pages)

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