0d5b95acb6
ABI is being implemented for x86_64, making it necessary to support protected exports header file generation for the GKI modules for multiple architecture. Enable support to select required inputs based on the ARCH to generate gki_module_protected_exports.h during kernel build. Inputs for generating gki_module_protected_exports.h are: ARCH = arm64: ABI Protected exports list: abi_gki_protected_exports_aarch64 Protected GKI modules list: gki_aarch64_protected_modules ARCH = x86_64: ABI Protected exports list: abi_gki_protected_exports_x86_64 Protected GKI modules list: gki_x86_64_protected_modules Test: TH Test: Manual verification of the generated header file Test: bazel run //common:kernel_aarch64_abi_update_protected_exports Bug: 151893768 Change-Id: Ic4bcb2732199b71a7973b5ce4c852bcd95d37131 Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
116 lines
2.9 KiB
Bash
Executable File
116 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# Copyright 2022 Google LLC
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# Author: ramjiyani@google.com (Ramji Jiyani)
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#
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#
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# Generates header file with list of unprotected symbols
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#
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# Called By: KERNEL_SRC/kernel/Makefile if CONFIG_MODULE_SIG_PROTECT=y
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#
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# gki_module_unprotected.h: Symbols allowed to _access_ by unsigned modules
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#
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# If valid symbol file doesn't exists then still generates valid C header files for
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# compilation to proceed with no symbols to protect
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#
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# Collect arguments from Makefile
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TARGET=$1
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SRCTREE=$2
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SYMBOL_LIST=$3
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set -e
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#
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# Common Definitions
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#
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# Use "make V=1" to debug this script.
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case "$KBUILD_VERBOSE" in
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*1*)
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set -x
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;;
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esac
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#
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# generate_header():
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# Args: $1 = Name of the header file
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# $2 = Input symbol list
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# $3 = Symbol type ("unprotected")
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#
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generate_header() {
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local header_file=$1
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local symbol_file=$2
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local symbol_type=$3
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if [ -f "${header_file}" ]; then
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rm -f -- "${header_file}"
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fi
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# If symbol_file exist preprocess it and find maximum name length
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if [ -s "${symbol_file}" ]; then
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# Remove White Spaces, empty lines and symbol list markers if any
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sed -i '/^[[:space:]]*$/d; /^#/d; /\[abi_symbol_list\]/d' "${symbol_file}"
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# Sort in byte order for kernel binary search at runtime
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LC_ALL=C sort -u -o "${symbol_file}" "${symbol_file}"
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# Trim white spaces & +1 for null termination
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local max_name_len=$(awk '
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{
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$1=$1;
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if ( length > L ) {
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L=length
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}
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} END { print ++L }' "${symbol_file}")
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else
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# Set to 1 to generate valid C header file
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local max_name_len=1
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fi
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# Header generation
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cat > "${header_file}" <<- EOT
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/*
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* DO NOT EDIT
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*
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* Build generated header file with ${symbol_type}
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*/
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#define NR_$(printf ${symbol_type} | tr [:lower:] [:upper:])_SYMBOLS \\
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$(printf '\t')(ARRAY_SIZE(gki_${symbol_type}_symbols))
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#define MAX_$(printf ${symbol_type} | tr [:lower:] [:upper:])_NAME_LEN (${max_name_len})
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static const char gki_${symbol_type}_symbols[][MAX_$(printf ${symbol_type} |
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tr [:lower:] [:upper:])_NAME_LEN] = {
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EOT
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# If a valid symbol_file present add symbols in an array except the 1st line
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if [ -s "${symbol_file}" ]; then
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sed -e 's/^[ \t]*/\t"/;s/[ \t]*$/",/' "${symbol_file}" >> "${header_file}"
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fi
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# Terminate the file
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echo "};" >> "${header_file}"
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}
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if [ "$(basename "${TARGET}")" = "gki_module_unprotected.h" ]; then
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# Union of vendor symbol lists
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GKI_VENDOR_SYMBOLS="${SYMBOL_LIST}"
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generate_header "${TARGET}" "${GKI_VENDOR_SYMBOLS}" "unprotected"
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else
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# Sorted list of exported symbols
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GKI_EXPORTED_SYMBOLS="${objtree}/abi_gki_protected_exports"
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if [ -z "${SYMBOL_LIST}" ]; then
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# Create empty list if ARCH doesn't have protected exports
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touch "${GKI_EXPORTED_SYMBOLS}"
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else
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# Make a temp copy to avoid changing source during pre-processing
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cp -f "${SYMBOL_LIST}" "${GKI_EXPORTED_SYMBOLS}"
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fi
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generate_header "${TARGET}" "${GKI_EXPORTED_SYMBOLS}" "protected_exports"
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fi
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