| Message ID | 1590614258-24728-4-git-send-email-Dave.Martin@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | prctl.2 man page updates for Linux 5.6 | expand |
Hi Dave, On Wed, 27 May 2020 at 23:18, Dave Martin <Dave.Martin@arm.com> 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 <tglx@linutronix.de> I had already applied your earlier send of this patch (in a private branch). I'll push those changes shortly. Cheers, Michael > --- > 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 >
On 5/27/20 5:17 PM, Dave Martin 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 <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 () Acked-by: Waiman Long <longman@redhat.com>
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 ()
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(-)