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From: Dave Martin <Dave.Martin@arm.com>
To: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: linux-arch@vger.kernel.org, linux-man@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	Waiman Long <longman@redhat.com>
Subject: [PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC for SPECULATION_CTRL prctls
Date: Wed, 27 May 2020 22:17:35 +0100	[thread overview]
Message-ID: <1590614258-24728-4-git-send-email-Dave.Martin@arm.com> (raw)
In-Reply-To: <1590614258-24728-1-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 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 ()
-- 
2.1.4


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  parent reply	other threads:[~2020-05-27 21:19 UTC|newest]

Thread overview: 37+ 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 ` Dave Martin [this message]
2020-05-28  6:57   ` [PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC " Michael Kerrisk (man-pages)
2020-05-28 13:45   ` Waiman Long
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
2020-06-10 10:16           ` Will Deacon
2020-06-10 12:48             ` 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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