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| author | Jessica Clarke <jrtc27@jrtc27.com> | 2021-10-02 21:50:06 +0100 |
|---|---|---|
| committer | Jessica Clarke <jrtc27@jrtc27.com> | 2021-10-03 16:20:09 +0100 |
| commit | d9eb82bd7515989f0b29d79deeeb758db4d6529c (patch) | |
| tree | ea5a56ffe0ad35ee6d61dd659af78fd09e842aa6 /source/components/executer/excreate.c | |
| parent | e01cc6b3d12b5f73f44d46fa15a7f569c793b328 (diff) | |
| download | acpica-d9eb82bd7515989f0b29d79deeeb758db4d6529c.tar.gz | |
Use original DataTableRegion pointer for accesses
Currently the pointer to the table is cast to ACPI_PHYSICAL_ADDRESS and
later cast back to a pointer to be dereferenced. Whether or not this is
supported is implementation-defined.
On CHERI, and thus Arm's experimental Morello prototype architecture,
pointers are represented as capabilities, which are unforgeable bounded
pointers, providing always-on fine-grained spatial memory safety. This
means that any pointer cast to a plain integer will lose all its
associated metadata, and when cast back to a pointer it will give a
null-derived pointer (one that has the same metadata as null but an
address equal to the integer) that will trap on any dereference. As a
result, this is an implementation where ACPI_PHYSICAL_ADDRESS cannot be
used as a hack to store real pointers.
Thus, add a new field to ACPI_OBJECT_REGION to store the pointer for
table regions, and propagate it to AcpiExDataTableSpaceHandler via the
region context, to use a more portable implementation that supports
CHERI.
Diffstat (limited to 'source/components/executer/excreate.c')
| -rw-r--r-- | source/components/executer/excreate.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/source/components/executer/excreate.c b/source/components/executer/excreate.c index 8afae43c7..18a3af2f1 100644 --- a/source/components/executer/excreate.c +++ b/source/components/executer/excreate.c @@ -451,6 +451,7 @@ AcpiExCreateRegion ( ObjDesc->Region.SpaceId = SpaceId; ObjDesc->Region.Address = 0; ObjDesc->Region.Length = 0; + ObjDesc->Region.Pointer = NULL; ObjDesc->Region.Node = Node; ObjDesc->Region.Handler = NULL; ObjDesc->Common.Flags &= |