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/[email protected]/
v2: https://lore.kernel.org/all/[email protected]/


This patch (of 6):

Fix tabs/spaces inconsistency in the mdwe test.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Florent Revest <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Cc: Alexey Izbyshev <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Ayush Jain <[email protected]>
Cc: Greg Thelen <[email protected]>
Cc: Joey Gouly <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Szabolcs Nagy <[email protected]>
Cc: Topi Miettinen <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions