13e6a16651
Remove dependency on kleaf intermediate abi_symbollist.raw and use vendor symbol lists as dependencies for header generation targets. This prevents the feature to break in case kleaf path and/or sandboxes changes and rebuilds the header files if any vendor symbol list changes. Update the header generation script to process the symbol lists before generating headers to make sure symbols are in byte order, any symbol list marker, whitespaces and emptylines are removed for kernel binary search API. Bug: 232430739 Test: TH Change-Id: Ib5783fb21543844dac7faf1fb0fcf3e7bd2bf608 Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
108 lines
2.6 KiB
Bash
Executable File
108 lines
2.6 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' "${symbol_file}"
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# Sort in byte order for kernel binary search at runtime
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LC_ALL=C sort -o "${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}" "${GKI_VENDOR_SYMBOLS}" "unprotected"
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else
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# Sorted list of exported symbols
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GKI_EXPORTED_SYMBOLS="${SYMBOL_LIST}"
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generate_header "${TARGET}" "${GKI_EXPORTED_SYMBOLS}" "protected_exports"
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fi
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