From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin 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 Message-ID: <1590614258-24728-4-git-send-email-Dave.Martin@arm.com> References: <1590614258-24728-1-git-send-email-Dave.Martin@arm.com> Return-path: In-Reply-To: <1590614258-24728-1-git-send-email-Dave.Martin-5wv7dgnIgG8@public.gmane.org> Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Michael Kerrisk Cc: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Waiman Long , Thomas Gleixner List-Id: linux-arch.vger.kernel.org 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 Cc: Waiman Long Cc: Thomas Gleixner --- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com ([217.140.110.172]:44778 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726114AbgE0VS3 (ORCPT ); Wed, 27 May 2020 17:18:29 -0400 From: Dave Martin 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 Message-ID: <1590614258-24728-4-git-send-email-Dave.Martin@arm.com> In-Reply-To: <1590614258-24728-1-git-send-email-Dave.Martin@arm.com> References: <1590614258-24728-1-git-send-email-Dave.Martin@arm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Michael Kerrisk Cc: linux-man@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Waiman Long , Thomas Gleixner Message-ID: <20200527211735.4l7-FTHXDOdwIKjy6mPmVLYj2nSYx0B63P9MDqAy47U@z> 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 Cc: Waiman Long Cc: Thomas Gleixner --- 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