1 #!/bin/sh 2 3 # relro_test.sh -- test -z relro 4 5 # Copyright (C) 2010-2016 Free Software Foundation, Inc. 6 # Written by Cary Coutant <ccoutant (at] google.com>. 7 8 # This file is part of gold. 9 10 # This program is free software; you can redistribute it and/or modify 11 # it under the terms of the GNU General Public License as published by 12 # the Free Software Foundation; either version 3 of the License, or 13 # (at your option) any later version. 14 15 # This program is distributed in the hope that it will be useful, 16 # but WITHOUT ANY WARRANTY; without even the implied warranty of 17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 # GNU General Public License for more details. 19 20 # You should have received a copy of the GNU General Public License 21 # along with this program; if not, write to the Free Software 22 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 23 # MA 02110-1301, USA. 24 25 # This test checks that the PT_GNU_RELRO segment is properly 26 # aligned and is coincident with the beginning of the data segment. 27 28 29 # Cleans a hexadecimal number for input to dc. 30 clean_hex() 31 { 32 echo "$1" | sed -e 's/0x//' -e 'y/abcdef/ABCDEF/' 33 } 34 35 check() 36 { 37 # Get the address and length of the PT_GNU_RELRO segment. 38 RELRO_START=`grep GNU_RELRO "$1" | awk '{ print $3; }'` 39 RELRO_LEN=`grep GNU_RELRO "$1" | awk '{ print $6; }'` 40 41 if test -z "$RELRO_START" 42 then 43 echo "Did not find a PT_GNU_RELRO segment." 44 exit 1 45 fi 46 47 # Get the address and alignment of the PT_LOAD segment whose address 48 # matches the PT_GNU_RELRO segment. 49 LOAD_ALIGN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $NF; }'` 50 LOAD_LEN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $6; }'` 51 52 if test -z "$LOAD_LEN" 53 then 54 echo "Did not find a PT_LOAD segment matching the PT_GNU_RELRO segment." 55 exit 1 56 fi 57 58 # Compute the address of the end of the PT_GNU_RELRO segment, 59 # modulo the alignment of the PT_LOAD segment. 60 RELRO_START=`clean_hex "$RELRO_START"` 61 RELRO_LEN=`clean_hex "$RELRO_LEN"` 62 LOAD_ALIGN=`clean_hex "$LOAD_ALIGN"` 63 RELRO_END=`echo "16o 16i $RELRO_START $RELRO_LEN + p" | dc` 64 REM=`echo "16i $RELRO_END $LOAD_ALIGN % p" | dc` 65 66 if test "$REM" -eq 0; then 67 : 68 else 69 echo "PT_GNU_RELRO segment does not end at page boundary." 70 exit 1 71 fi 72 } 73 74 check relro_test.stdout 75
