+ kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test.patch added to mm-unstable branch

+ kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: kselftest: vm: fix tabs/spaces inconsistency in the mdwe test
has been added to the -mm mm-unstable branch.  Its filename is
     kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Florent Revest <revest@chromium.org>
Subject: kselftest: vm: fix tabs/spaces inconsistency in the mdwe test
Date: Mon, 28 Aug 2023 17:08:53 +0200

Patch series "MDWE without inheritance", v4.

Joey recently introduced a Memory-Deny-Write-Executable (MDWE) prctl which
tags current with a flag that prevents pages that were previously not
executable from becoming executable.  This tag always gets inherited by
children tasks.  (it's in MMF_INIT_MASK)

At Google, we've been using a somewhat similar downstream patch for a few
years now.  To make the adoption of this feature easier, we've had it
support a mode in which the W^X flag does not propagate to children.  For
example, this is handy if a C process which wants W^X protection suspects
it could start children processes that would use a JIT.

I'd like to align our features with the upstream prctl.  This series
proposes a new NO_INHERIT flag to the MDWE prctl to make this kind of
adoption easier.  It sets a different flag in current that is not in
MMF_INIT_MASK and which does not propagate.

As part of looking into MDWE, I also fixed a couple of things in the MDWE
test.


This patch (of 6):

Fix tabs/spaces inconsistency in the mdwe test.

Link: https://lkml.kernel.org/r/20230828150858.393570-1-revest@chromium.org
Link: https://lkml.kernel.org/r/20230828150858.393570-2-revest@chromium.org
Signed-off-by: Florent Revest <revest@chromium.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alexey Izbyshev <izbyshev@ispras.ru>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ayush Jain <ayush.jain3@amd.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Cc: Topi Miettinen <toiwoton@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/mdwe_test.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/tools/testing/selftests/mm/mdwe_test.c~kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test
+++ a/tools/testing/selftests/mm/mdwe_test.c
@@ -49,19 +49,19 @@ FIXTURE_VARIANT(mdwe)
 
 FIXTURE_VARIANT_ADD(mdwe, stock)
 {
-        .enabled = false,
+	.enabled = false,
 	.forked = false,
 };
 
 FIXTURE_VARIANT_ADD(mdwe, enabled)
 {
-        .enabled = true,
+	.enabled = true,
 	.forked = false,
 };
 
 FIXTURE_VARIANT_ADD(mdwe, forked)
 {
-        .enabled = true,
+	.enabled = true,
 	.forked = true,
 };
 
_

Patches currently in -mm which might be from revest@chromium.org are

kselftest-vm-fix-tabs-spaces-inconsistency-in-the-mdwe-test.patch
kselftest-vm-fix-mdwes-mmap_fixed-test-case.patch
kselftest-vm-check-errnos-in-mdwe_test.patch
mm-make-pr_mdwe_refuse_exec_gain-an-unsigned-long.patch
mm-add-a-no_inherit-flag-to-the-pr_set_mdwe-prctl.patch
kselftest-vm-add-tests-for-no-inherit-memory-deny-write-execute.patch