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authorJessica Clarke <jrtc27@jrtc27.com>2021-12-22 17:21:25 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-12-27 17:01:28 +0100
commitca25f92b72d25457653dbf2a81f322235804fb05 (patch)
treef2f76e44ffbcc7e0c05e1a0adb4f04ee4b6f2a28 /include/acpi
parentf81bdeaf816142e0729eea0cc84c395ec9673151 (diff)
ACPICA: Use original data_table_region pointer for accesses
ACPICA commit d9eb82bd7515989f0b29d79deeeb758db4d6529c 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 struct acpi_object_region to store the pointer for table regions, and propagate it to acpi_ex_data_table_space_handler via the region context, to use a more portable implementation that supports CHERI. Link: https://github.com/acpica/acpica/commit/d9eb82bd Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/actypes.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 248242dca28d..700c2449e85a 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1221,6 +1221,10 @@ struct acpi_mem_space_context {
struct acpi_mem_mapping *first_mm;
};
+struct acpi_data_table_space_context {
+ void *pointer;
+};
+
/*
* struct acpi_memory_list is used only if the ACPICA local cache is enabled
*/