1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4if [ $# -ne 2 ] 5then 6 echo "Usage: headers_install.sh INFILE OUTFILE" 7 echo 8 echo "Prepares kernel header files for use by user space, by removing" 9 echo "all compiler.h definitions and #includes, removing any" 10 echo "#ifdef __KERNEL__ sections, and putting __underscores__ around" 11 echo "asm/inline/volatile keywords." 12 echo 13 echo "INFILE: header file to operate on" 14 echo "OUTFILE: output file which the processed header is written to" 15 16 exit 1 17fi 18 19# Grab arguments 20INFILE=$1 21OUTFILE=$2 22TMPFILE=$OUTFILE.tmp 23 24trap 'rm -f $OUTFILE $TMPFILE' EXIT 25 26# SPDX-License-Identifier with GPL variants must have "WITH Linux-syscall-note" 27if [ -n "$(sed -n -e "/SPDX-License-Identifier:.*GPL-/{/WITH Linux-syscall-note/!p}" $INFILE)" ]; then 28 echo "error: $INFILE: missing \"WITH Linux-syscall-note\" for SPDX-License-Identifier" >&2 29 exit 1 30fi 31 32sed -E -e ' 33 s/([[:space:](])(__user|__force|__iomem)[[:space:]]/\1/g 34 s/__attribute_const__([[:space:]]|$)/\1/g 35 s@^#include <linux/compiler(|_types).h>@@ 36 s/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g 37 s/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g 38 s@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @ 39' $INFILE > $TMPFILE || exit 1 40 41scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ $TMPFILE > $OUTFILE 42[ $? -gt 1 ] && exit 1 43 44# Remove /* ... */ style comments, and find CONFIG_ references in code 45configs=$(sed -e ' 46:comment 47 s:/\*[^*][^*]*:/*: 48 s:/\*\*\**\([^/]\):/*\1: 49 t comment 50 s:/\*\*/: : 51 t comment 52 /\/\*/! b check 53 N 54 b comment 55:print 56 P 57 D 58:check 59 s:^\(CONFIG_[[:alnum:]_]*\):\1\n: 60 t print 61 s:^[[:alnum:]_][[:alnum:]_]*:: 62 s:^[^[:alnum:]_][^[:alnum:]_]*:: 63 t check 64 d 65' $OUTFILE) 66 67# The entries in the following list do not result in an error. 68# Please do not add a new entry. This list is only for existing ones. 69# The list will be reduced gradually, and deleted eventually. (hopefully) 70# 71# The format is <file-name>:<CONFIG-option> in each line. 72config_leak_ignores=" 73arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_16K 74arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_4K 75arch/arc/include/uapi/asm/swab.h:CONFIG_ARC_HAS_SWAPE 76arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8 77arch/hexagon/include/uapi/asm/ptrace.h:CONFIG_HEXAGON_ARCH_VERSION 78arch/hexagon/include/uapi/asm/user.h:CONFIG_HEXAGON_ARCH_VERSION 79arch/m68k/include/uapi/asm/ptrace.h:CONFIG_COLDFIRE 80arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO 81arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT 82arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION 83arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64 84" 85 86for c in $configs 87do 88 leak_error=1 89 90 for ignore in $config_leak_ignores 91 do 92 if echo "$INFILE:$c" | grep -q "$ignore$"; then 93 leak_error= 94 break 95 fi 96 done 97 98 if [ "$leak_error" = 1 ]; then 99 echo "error: $INFILE: leak $c to user-space" >&2 100 exit 1 101 fi 102done 103 104rm -f $TMPFILE 105trap - EXIT 106