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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 /drivers/pinctrl/pxa
parentACPICA: actypes.h: Expand the ACPI_ACCESS_ definitions (diff)
downloadlinux-ca25f92b72d25457653dbf2a81f322235804fb05.tar.xz
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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 'drivers/pinctrl/pxa')
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