Florent Revest 24e41bf8a6 mm: add a NO_INHERIT flag to the PR_SET_MDWE prctl ... 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>		2023-10-06 14:44:11 -07:00
..
asm	tools headers: Update the copy of x86's mem{cpy,set}_64.S used in 'perf bench'	2023-05-17 10:42:19 -03:00
asm-generic	tools: KVM: selftests: Convert clear/set_bit() to actual atomics	2022-12-02 13:22:35 -05:00
linux	Networking fixes for 6.6-rc2, including fixes from netfilter and bpf	2023-09-21 11:28:16 -07:00
nolibc	tools/nolibc: keep brk(), sbrk(), mmap() away from __sysret()	2023-08-23 05:19:22 +02:00
tools	tools include: add dis-asm-compat.h to handle version differences	2022-08-01 15:29:49 -03:00
trace/events
uapi	mm: add a NO_INHERIT flag to the PR_SET_MDWE prctl	2023-10-06 14:44:11 -07:00
vdso	tools headers: Synchronize {linux,vdso}/bits.h with the kernel sources	2023-03-03 22:34:15 -03:00