diff options
| author | Joey Gouly <[email protected]> | 2023-06-06 15:58:50 +0100 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2023-06-06 16:52:41 +0100 |
| commit | f0af339fc408a55c9f48f5d9ca47059ef1eb36b8 (patch) | |
| tree | f71ee516598e602503bfcfea30789697cfdbcbca /lib/mpi/mpi-mod.c | |
| parent | 8ef67c67e637809a28f0efeb045aa454c7799a51 (diff) | |
arm64: add PTE_UXN/PTE_WRITE to SWAPPER_*_FLAGS
With PIE enabled, the swapper PTEs would have a Permission Indirection Index
(PIIndex) of 0. A PIIndex of 0 is not currently used by any other PTEs.
To avoid using index 0 specifically for the swapper PTEs, mark them as
PTE_UXN and PTE_WRITE, so that they map to a PAGE_KERNEL_EXEC equivalent.
This also adds PTE_WRITE to KPTI_NG_PTE_FLAGS, which was tested by booting
with kpti=on.
Signed-off-by: Joey Gouly <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mark Rutland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-mod.c')
0 files changed, 0 insertions, 0 deletions