linux-man.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
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,
	Waiman Long <longman@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 11/14] prctl.2: Add PR_SPEC_DISABLE_NOEXEC for SPECULATION_CTRL prctls
Date: Tue, 12 May 2020 17:36:56 +0100	[thread overview]
Message-ID: <1589301419-24459-12-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_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 66417cf..2361b44 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
@@ -1898,11 +1915,12 @@ 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 ()
-- 
2.1.4


  parent reply	other threads:[~2020-05-12 16:37 UTC|newest]

Thread overview: 57+ 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 ` [PATCH 01/14] prctl.2: tfix clarify that prctl can apply to threads Dave Martin
2020-05-13  8:30   ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 02/14] prctl.2: Add health warning Dave Martin
2020-05-13 10:10   ` Michael Kerrisk (man-pages)
2020-05-13 11:13     ` Dave Martin
2020-05-13 11:40       ` Michael Kerrisk (man-pages)
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
2020-05-13  8:36   ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 04/14] prctl.2: srcfix add comments for navigation Dave Martin
2020-05-13 10:09   ` Michael Kerrisk (man-pages)
2020-05-13 10:56     ` Dave Martin
2020-05-13 11:03       ` Michael Kerrisk (man-pages)
2020-05-13 11:15         ` Dave Martin
2020-05-13 11:48           ` Michael Kerrisk (man-pages)
2020-05-13 11:51             ` Dave Martin
2020-05-12 16:36 ` [PATCH 05/14] prctl.2: tfix listing order of prctls Dave Martin
2020-05-13 10:10   ` Michael Kerrisk (man-pages)
2020-05-13 11:21     ` Dave Martin
2020-05-13 11:31       ` Michael Kerrisk (man-pages)
2020-05-13 11:45         ` Dave Martin
2020-05-12 16:36 ` [PATCH 06/14] prctl.2: ffix quotation mark tweaks Dave Martin
2020-05-13 10:11   ` Michael Kerrisk (man-pages)
2020-05-13 11:39     ` Dave Martin
2020-05-13 11:46       ` Michael Kerrisk (man-pages)
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 16:41   ` Dave Hansen
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
2020-05-13 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
2020-05-13 10:31   ` Michael Kerrisk (man-pages)
2020-05-12 16:36 ` [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for " Dave Martin
2020-05-13 11:21   ` Michael Kerrisk (man-pages)
2020-05-13 11:49     ` Dave Martin
2020-05-13 12:06       ` Michael Kerrisk (man-pages)
2020-05-13 13:53         ` Dave Martin
2020-05-12 16:36 ` Dave Martin [this message]
2020-05-12 16:36 ` [PATCH 12/14] prctl.2: Clarify the unsupported hardware case of EINVAL Dave Martin
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
2020-05-13  8:43   ` Will Deacon
2020-05-13 10:46     ` Dave Martin
2020-05-13 11:01       ` Michael Kerrisk (man-pages)
2020-05-13 14:02         ` Dave Martin
2020-05-13 21:11           ` Will Deacon
2020-05-18 16:37             ` 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
2020-05-13  7:25   ` Will Deacon
2020-05-13 14:36     ` Dave Martin
2020-05-13 21:00       ` Will Deacon
2020-05-18 16:11         ` Dave Martin
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)

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1589301419-24459-12-git-send-email-Dave.Martin@arm.com \
    --to=dave.martin@arm.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-man@vger.kernel.org \
    --cc=longman@redhat.com \
    --cc=mtk.manpages@gmail.com \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).