Florent Revest 2b00d1fd9a mm: add a NO_INHERIT flag to the PR_SET_MDWE prctl ... [ Upstream commit 24e41bf8a6 ] This extends the current PR_SET_MDWE prctl arg with a bit to indicate that the process doesn't want MDWE protection to propagate to children. To implement this no-inherit mode, the tag in current->mm->flags must be absent from MMF_INIT_MASK. This means that the encoding for "MDWE but without inherit" is different in the prctl than in the mm flags. This leads to a bit of bit-mangling in the prctl implementation. Link: https://lkml.kernel.org/r/20230828150858.393570-6-revest@chromium.org Signed-off-by: Florent Revest <revest@chromium.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-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: David Hildenbrand <david@redhat.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: Ryan Roberts <ryan.roberts@arm.com> Cc: Szabolcs Nagy <Szabolcs.Nagy@arm.com> Cc: Topi Miettinen <toiwoton@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Stable-dep-of: 793838138c ("prctl: Disable prctl(PR_SET_MDWE) on parisc") Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-03 07:33:06 +01:00
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affinity.h
autogroup.h
clock.h
cond_resched.h
coredump.h	mm: add a NO_INHERIT flag to the PR_SET_MDWE prctl	2023-12-03 07:33:06 +01:00
cpufreq.h
cputime.h
deadline.h
debug.h
hotplug.h
idle.h
init.h
isolation.h
jobctl.h
loadavg.h
mm.h
nohz.h
numa_balancing.h
posix-timers.h
prio.h
rseq_api.h
rt.h
sd_flags.h
signal.h	document while_each_thread(), change first_tid() to use for_each_thread()	2023-08-24 16:25:15 -07:00
smt.h
stat.h
sysctl.h
task.h	sched: avoid false lockdep splat in put_task_struct()	2023-07-13 15:21:48 +02:00
task_flags.h
task_stack.h
thread_info_api.h
topology.h
types.h
user.h
vhost_task.h
wake_q.h
xacct.h