f739cf68c0
Add a file "fstab.gs101-fips" alongside the existing "fstab.gs101" in order to specify different encryption settings in FIPS mode. "androidboot.fstab_suffix=gs101-fips" on the kernel command line will be used to select the FIPS fstab when needed. As the two fstabs should be otherwise identical, generate them from a template file so that they will stay in sync. Note that generating the fstabs requires that they be installed as build system modules rather than via PRODUCT_COPY_FILES, which results in the vendor_ramdisk copy of the fstabs being installed to system/etc rather than /. This shouldn't cause any problem, now that Android has been updated to look for the fstab in this location too. Bug: 191417025 Change-Id: I1d115e014df8ba2fb83046ac0b9b791597364846
55 lines
2 KiB
Text
55 lines
2 KiB
Text
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// By default this device uses hardware-wrapped keys for storage encryption,
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// which is intended to offer increased security over the traditional method
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// (software keys). However, hardware-wrapped keys aren't compatible with
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// FIPS-140 certification of the encryption hardware, and hence we have to
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// disable the use of them in FIPS mode. This requires having two fstab files:
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// one for the default mode, and one for FIPS mode selectable via
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// androidboot.fstab_suffix on the kernel command line. These fstabs should be
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// identical with the exception of the encryption settings, so to keep them in
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// sync the rules below generate them from a template file.
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genrule {
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name: "gen_fstab.gs101",
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srcs: ["fstab.gs101.in"],
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out: ["fstab.gs101"],
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cmd: "sed -e s/@fileencryption@/::inlinecrypt_optimized+wrappedkey_v0/" +
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" -e s/@metadata_encryption@/:wrappedkey_v0/ $(in) > $(out)",
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}
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genrule {
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name: "gen_fstab.gs101-fips",
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srcs: ["fstab.gs101.in"],
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out: ["fstab.gs101-fips"],
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cmd: "sed -e s/@fileencryption@/aes-256-xts/" +
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" -e s/@metadata_encryption@/aes-256-xts/ $(in) > $(out)",
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}
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prebuilt_etc {
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name: "fstab.gs101",
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src: ":gen_fstab.gs101",
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vendor: true,
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vendor_ramdisk_available: true,
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}
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prebuilt_etc {
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name: "fstab.gs101-fips",
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src: ":gen_fstab.gs101-fips",
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vendor: true,
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vendor_ramdisk_available: true,
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}
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