Messages in this thread | | | Date | Mon, 8 Aug 2022 15:23:55 +0200 | From | Greg KH <> | Subject | Re: [PATCH][for-stable] arm64: set UXN on swapper page tables |
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On Mon, Aug 08, 2022 at 01:53:21PM +0100, Will Deacon wrote: > From: Peter Collingbourne <pcc@google.com> > > [ This issue was fixed upstream by accident in c3cee924bd85 ("arm64: > head: cover entire kernel image in initial ID map") as part of a > large refactoring of the arm64 boot flow. This simple fix is therefore > preferred for -stable backporting ] > > On a system that implements FEAT_EPAN, read/write access to the idmap > is denied because UXN is not set on the swapper PTEs. As a result, > idmap_kpti_install_ng_mappings panics the kernel when accessing > __idmap_kpti_flag. Fix it by setting UXN on these PTEs. > > Fixes: 18107f8a2df6 ("arm64: Support execute-only permissions with Enhanced PAN") > Cc: <stable@vger.kernel.org> # 5.15 > Link: https://linux-review.googlesource.com/id/Ic452fa4b4f74753e54f71e61027e7222a0fae1b1 > Signed-off-by: Peter Collingbourne <pcc@google.com> > Acked-by: Will Deacon <will@kernel.org> > Cc: Ard Biesheuvel <ardb@kernel.org> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Link: https://lore.kernel.org/r/20220719234909.1398992-1-pcc@google.com > Signed-off-by: Will Deacon <will@kernel.org> > --- > arch/arm64/include/asm/kernel-pgtable.h | 4 ++-- > arch/arm64/kernel/head.S | 2 +- > 2 files changed, 3 insertions(+), 3 deletions(-)
So this should be added to 5.15.y, 5.18.y, and 5.19.y? Or some subset?
thanks,
greg k-h
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