From 29d68b219ff858e11b6bc1477fa7af58db6895c9 Mon Sep 17 00:00:00 2001 From: Florent Revest Date: Mon, 28 Aug 2023 17:08:53 +0200 Subject: [PATCH] kselftest: vm: fix tabs/spaces inconsistency in the mdwe test 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. The background for this was discussed in these threads: v1: https://lore.kernel.org/all/66900d0ad42797a55259061f757beece@ispras.ru/ v2: https://lore.kernel.org/all/d7e3749c-a718-df94-92af-1cb0fecab772@redhat.com/ 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 Reviewed-by: David Hildenbrand Reviewed-by: Kees Cook Acked-by: Catalin Marinas Cc: Alexey Izbyshev Cc: Anshuman Khandual Cc: Ayush Jain Cc: Greg Thelen Cc: Joey Gouly Cc: KP Singh Cc: Mark Brown Cc: Michal Hocko Cc: Peter Xu Cc: Szabolcs Nagy Cc: Topi Miettinen Cc: Ryan Roberts Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/mdwe_test.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftests/mm/mdwe_test.c index bc91bef5d254e..d0954c657febc 100644 --- a/tools/testing/selftests/mm/mdwe_test.c +++ b/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, }; -- 2.30.2