From: Dave Martin <Dave.Martin@arm.com>
To: mtk.manpages@gmail.com
Cc: linux-man@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Tim Chen <tim.c.chen@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls
Date: Tue, 12 May 2020 17:36:55 +0100 [thread overview]
Message-ID: <1589301419-24459-11-git-send-email-Dave.Martin@arm.com> (raw)
In-Reply-To: <1589301419-24459-1-git-send-email-Dave.Martin@arm.com>
Add the PR_SPEC_INDIRECT_BRANCH "misfeature" added in Linux 4.20
for PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
man2/prctl.2 | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index e8eaf95..66417cf 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -1213,11 +1213,20 @@ arguments must be specified as 0; otherwise the call fails with the error
.\" commit 356e4bfff2c5489e016fdb925adbf12a1e3950ee
Sets the state of the speculation misfeature specified in
.IR arg2 .
-Currently, the only permitted value for this argument is
+Currently, this argument must be one of:
+.RS
+.TP
.B PR_SPEC_STORE_BYPASS
-(otherwise the call fails with the error
+speculative store bypass control, or
+.\" commit 9137bb27e60e554dab694eafa4cca241fa3a694f
+.TP
+.BR PR_SPEC_INDIRECT_BRANCH " (since Linux 4.20)"
+indirect branch speculation control.
+.RE
+.IP
+(Otherwise the call fails with the error
.BR ENODEV ).
-This setting is a per-thread attribute.
+These settings are per-thread attributes.
The
.IR arg3
argument is used to hand in the control value,
@@ -1235,13 +1244,16 @@ Same as
.BR PR_SPEC_DISABLE ,
but cannot be undone.
A subsequent
-.B
-prctl(..., PR_SPEC_ENABLE)
+.BR prctl (\c
+.IR arg2 ,
+.BR PR_SPEC_ENABLE )
+with the same value for
+.I arg2
will fail with the error
.BR EPERM .
.RE
.IP
-Any other value in
+Any unsupported value in
.IR arg3
will result in the call failing with the error
.BR ERANGE .
--
2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Dave Martin <Dave.Martin-5wv7dgnIgG8@public.gmane.org>
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Tim Chen <tim.c.chen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Subject: [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls
Date: Tue, 12 May 2020 17:36:55 +0100 [thread overview]
Message-ID: <1589301419-24459-11-git-send-email-Dave.Martin@arm.com> (raw)
In-Reply-To: <1589301419-24459-1-git-send-email-Dave.Martin-5wv7dgnIgG8@public.gmane.org>
Add the PR_SPEC_INDIRECT_BRANCH "misfeature" added in Linux 4.20
for PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL.
Signed-off-by: Dave Martin <Dave.Martin-5wv7dgnIgG8@public.gmane.org>
Cc: Tim Chen <tim.c.chen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
---
man2/prctl.2 | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index e8eaf95..66417cf 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -1213,11 +1213,20 @@ arguments must be specified as 0; otherwise the call fails with the error
.\" commit 356e4bfff2c5489e016fdb925adbf12a1e3950ee
Sets the state of the speculation misfeature specified in
.IR arg2 .
-Currently, the only permitted value for this argument is
+Currently, this argument must be one of:
+.RS
+.TP
.B PR_SPEC_STORE_BYPASS
-(otherwise the call fails with the error
+speculative store bypass control, or
+.\" commit 9137bb27e60e554dab694eafa4cca241fa3a694f
+.TP
+.BR PR_SPEC_INDIRECT_BRANCH " (since Linux 4.20)"
+indirect branch speculation control.
+.RE
+.IP
+(Otherwise the call fails with the error
.BR ENODEV ).
-This setting is a per-thread attribute.
+These settings are per-thread attributes.
The
.IR arg3
argument is used to hand in the control value,
@@ -1235,13 +1244,16 @@ Same as
.BR PR_SPEC_DISABLE ,
but cannot be undone.
A subsequent
-.B
-prctl(..., PR_SPEC_ENABLE)
+.BR prctl (\c
+.IR arg2 ,
+.BR PR_SPEC_ENABLE )
+with the same value for
+.I arg2
will fail with the error
.BR EPERM .
.RE
.IP
-Any other value in
+Any unsupported value in
.IR arg3
will result in the call failing with the error
.BR ERANGE .
--
2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Dave Martin <Dave.Martin@arm.com>
To: mtk.manpages@gmail.com
Cc: linux-arch@vger.kernel.org, linux-man@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Tim Chen <tim.c.chen@linux.intel.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls
Date: Tue, 12 May 2020 17:36:55 +0100 [thread overview]
Message-ID: <1589301419-24459-11-git-send-email-Dave.Martin@arm.com> (raw)
In-Reply-To: <1589301419-24459-1-git-send-email-Dave.Martin@arm.com>
Add the PR_SPEC_INDIRECT_BRANCH "misfeature" added in Linux 4.20
for PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
man2/prctl.2 | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index e8eaf95..66417cf 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -1213,11 +1213,20 @@ arguments must be specified as 0; otherwise the call fails with the error
.\" commit 356e4bfff2c5489e016fdb925adbf12a1e3950ee
Sets the state of the speculation misfeature specified in
.IR arg2 .
-Currently, the only permitted value for this argument is
+Currently, this argument must be one of:
+.RS
+.TP
.B PR_SPEC_STORE_BYPASS
-(otherwise the call fails with the error
+speculative store bypass control, or
+.\" commit 9137bb27e60e554dab694eafa4cca241fa3a694f
+.TP
+.BR PR_SPEC_INDIRECT_BRANCH " (since Linux 4.20)"
+indirect branch speculation control.
+.RE
+.IP
+(Otherwise the call fails with the error
.BR ENODEV ).
-This setting is a per-thread attribute.
+These settings are per-thread attributes.
The
.IR arg3
argument is used to hand in the control value,
@@ -1235,13 +1244,16 @@ Same as
.BR PR_SPEC_DISABLE ,
but cannot be undone.
A subsequent
-.B
-prctl(..., PR_SPEC_ENABLE)
+.BR prctl (\c
+.IR arg2 ,
+.BR PR_SPEC_ENABLE )
+with the same value for
+.I arg2
will fail with the error
.BR EPERM .
.RE
.IP
-Any other value in
+Any unsupported value in
.IR arg3
will result in the call failing with the error
.BR ERANGE .
--
2.1.4
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next prev parent reply other threads:[~2020-05-12 16:37 UTC|newest]
Thread overview: 149+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-12 16:36 [PATCH 00/14] prctl.2 man page updates for Linux 5.6 Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` [PATCH 01/14] prctl.2: tfix clarify that prctl can apply to threads Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 8:30 ` Michael Kerrisk (man-pages)
2020-05-13 8:30 ` Michael Kerrisk (man-pages)
2020-05-13 8:30 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 02/14] prctl.2: Add health warning Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:10 ` Michael Kerrisk (man-pages)
2020-05-13 10:10 ` Michael Kerrisk (man-pages)
2020-05-13 10:10 ` Michael Kerrisk (man-pages)
2020-05-13 11:13 ` Dave Martin
2020-05-13 11:13 ` Dave Martin
2020-05-13 11:40 ` Michael Kerrisk (man-pages)
2020-05-13 11:40 ` Michael Kerrisk (man-pages)
2020-05-13 11:40 ` Michael Kerrisk (man-pages)
2020-05-13 11:41 ` Dave Martin
2020-05-13 11:41 ` Dave Martin
2020-05-13 11:41 ` Dave Martin
2020-05-12 16:36 ` [PATCH 03/14] prctl.2: tfix mis-description of thread ID values in procfs Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 8:36 ` Michael Kerrisk (man-pages)
2020-05-13 8:36 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 04/14] prctl.2: srcfix add comments for navigation Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:09 ` Michael Kerrisk (man-pages)
2020-05-13 10:09 ` Michael Kerrisk (man-pages)
2020-05-13 10:56 ` Dave Martin
2020-05-13 10:56 ` Dave Martin
2020-05-13 11:03 ` Michael Kerrisk (man-pages)
2020-05-13 11:03 ` Michael Kerrisk (man-pages)
2020-05-13 11:03 ` Michael Kerrisk (man-pages)
2020-05-13 11:15 ` Dave Martin
2020-05-13 11:15 ` Dave Martin
2020-05-13 11:48 ` Michael Kerrisk (man-pages)
2020-05-13 11:48 ` Michael Kerrisk (man-pages)
2020-05-13 11:48 ` Michael Kerrisk (man-pages)
2020-05-13 11:51 ` Dave Martin
2020-05-13 11:51 ` Dave Martin
2020-05-13 11:51 ` Dave Martin
2020-05-12 16:36 ` [PATCH 05/14] prctl.2: tfix listing order of prctls Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:10 ` Michael Kerrisk (man-pages)
2020-05-13 10:10 ` Michael Kerrisk (man-pages)
2020-05-13 11:21 ` Dave Martin
2020-05-13 11:21 ` Dave Martin
2020-05-13 11:21 ` Dave Martin
2020-05-13 11:31 ` Michael Kerrisk (man-pages)
2020-05-13 11:31 ` Michael Kerrisk (man-pages)
2020-05-13 11:31 ` Michael Kerrisk (man-pages)
2020-05-13 11:45 ` Dave Martin
2020-05-13 11:45 ` Dave Martin
2020-05-13 11:45 ` Dave Martin
2020-05-12 16:36 ` [PATCH 06/14] prctl.2: ffix quotation mark tweaks Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-13 11:39 ` Dave Martin
2020-05-13 11:39 ` Dave Martin
2020-05-13 11:39 ` Dave Martin
2020-05-13 11:46 ` Michael Kerrisk (man-pages)
2020-05-13 11:46 ` Michael Kerrisk (man-pages)
2020-05-13 11:51 ` Dave Martin
2020-05-13 11:51 ` Dave Martin
2020-05-13 11:51 ` Dave Martin
2020-05-12 16:36 ` [PATCH 07/14] prctl.2: Document removal of Intel MPX prctls Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:41 ` Dave Hansen
2020-05-12 16:41 ` Dave Hansen
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-13 10:11 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 08/14] prctl.2: Work around bogus constant "maxsig" in PR_SET_PDEATHSIG Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:30 ` Michael Kerrisk (man-pages)
2020-05-13 10:30 ` Michael Kerrisk (man-pages)
2020-05-13 10:30 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 09/14] prctl.2: tfix minor punctuation in SPECULATION_CTRL prctls Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:31 ` Michael Kerrisk (man-pages)
2020-05-13 10:31 ` Michael Kerrisk (man-pages)
2020-05-13 10:31 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` Dave Martin [this message]
2020-05-12 16:36 ` [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for " Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 11:21 ` Michael Kerrisk (man-pages)
2020-05-13 11:21 ` Michael Kerrisk (man-pages)
2020-05-13 11:21 ` Michael Kerrisk (man-pages)
2020-05-13 11:49 ` Dave Martin
2020-05-13 11:49 ` Dave Martin
2020-05-13 12:06 ` Michael Kerrisk (man-pages)
2020-05-13 12:06 ` Michael Kerrisk (man-pages)
2020-05-13 12:06 ` Michael Kerrisk (man-pages)
2020-05-13 13:53 ` Dave Martin
2020-05-13 13:53 ` Dave Martin
2020-05-13 13:53 ` Dave Martin
2020-05-12 16:36 ` [PATCH 11/14] prctl.2: Add PR_SPEC_DISABLE_NOEXEC " Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` [PATCH 12/14] prctl.2: Clarify the unsupported hardware case of EINVAL Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 10:48 ` Michael Kerrisk (man-pages)
2020-05-13 10:48 ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 13/14] prctl.2: Add SVE prctls (arm64) Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 8:43 ` Will Deacon
2020-05-13 8:43 ` Will Deacon
2020-05-13 8:43 ` Will Deacon
2020-05-13 10:46 ` Dave Martin
2020-05-13 10:46 ` Dave Martin
2020-05-13 10:46 ` Dave Martin
2020-05-13 11:01 ` Michael Kerrisk (man-pages)
2020-05-13 11:01 ` Michael Kerrisk (man-pages)
2020-05-13 14:02 ` Dave Martin
2020-05-13 14:02 ` Dave Martin
2020-05-13 14:02 ` Dave Martin
2020-05-13 21:11 ` Will Deacon
2020-05-13 21:11 ` Will Deacon
2020-05-13 21:11 ` Will Deacon
2020-05-18 16:37 ` Dave Martin
2020-05-18 16:37 ` Dave Martin
2020-05-26 14:45 ` Dave Martin
2020-05-26 14:45 ` Dave Martin
2020-05-12 16:36 ` [PATCH 14/14] prctl.2: Add PR_PAC_RESET_KEYS (arm64) Dave Martin
2020-05-12 16:36 ` Dave Martin
2020-05-13 7:25 ` Will Deacon
2020-05-13 7:25 ` Will Deacon
2020-05-13 14:36 ` Dave Martin
2020-05-13 14:36 ` Dave Martin
2020-05-13 14:36 ` Dave Martin
2020-05-13 21:00 ` Will Deacon
2020-05-13 21:00 ` Will Deacon
2020-05-13 21:00 ` Will Deacon
2020-05-18 16:11 ` Dave Martin
2020-05-18 16:11 ` Dave Martin
2020-05-18 16:11 ` Dave Martin
2020-05-18 16:29 ` Will Deacon
2020-05-18 16:29 ` Will Deacon
2020-05-18 16:29 ` Will Deacon
2020-05-13 11:28 ` [PATCH 00/14] prctl.2 man page updates for Linux 5.6 Michael Kerrisk (man-pages)
2020-05-13 11:28 ` Michael Kerrisk (man-pages)
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