Re: [PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC for SPECULATION_CTRL prctls
From: Michael Kerrisk (man-pages) <hidden>
Date: 2020-05-28 06:58:04
Also in:
linux-arch, linux-man
Hi Dave, On Wed, 27 May 2020 at 23:18, Dave Martin [off-list ref] 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 <redacted>
I had already applied your earlier send of this patch (in a private branch). I'll push those changes shortly. Cheers, Michael
quoted hunk ↗ jump to hunk
--- 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
-- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel