| 1 | #!/bin/sh |
| 2 | |
| 3 | # relro_test.sh -- test -z relro |
| 4 | |
| 5 | # Copyright (C) 2010-2019 Free Software Foundation, Inc. |
| 6 | # Written by Cary Coutant <ccoutant@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 |