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| author | Peter Collingbourne <pcc@google.com> | 2022-08-08 13:53:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-11 13:20:42 +0200 |
| commit | a1c8d49fe09390d281a78ddebfdbf4b2974a7856 (patch) | |
| tree | 2b6b560645c82dccbb53a755bb9bac38d373decb /fs/btrfs/inode.c | |
| parent | 731dd6be504568490986ef60144e6fe1e34f512e (diff) | |
| download | linux-stable-a1c8d49fe09390d281a78ddebfdbf4b2974a7856.tar.gz | |
arm64: set UXN on swapper page tables
[ 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs/inode.c')
0 files changed, 0 insertions, 0 deletions