1 #!/bin/sh 2 # 3 # Copyright (c) 2017 Fujitsu Ltd. 4 # Ported: Guangwen Feng <fenggw-fnst (at] cn.fujitsu.com> 5 # 6 # This program is free software; you can redistribute it and/or modify 7 # it under the terms of the GNU General Public License as published by 8 # the Free Software Foundation; either version 2 of the License, or 9 # (at your option) any later version. 10 # 11 # This program is distributed in the hope that it would be useful, 12 # but WITHOUT ANY WARRANTY; without even the implied warranty of 13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 # GNU General Public License for more details. 15 # 16 # You should have received a copy of the GNU General Public License 17 # along with this program, if not, see <http://www.gnu.org/licenses/>. 18 # 19 # This is a regression test about potential uninitialized variable, 20 # the test can crash the buggy kernel, and the bug has been fixed in: 21 # 22 # commit 38327424b40bcebe2de92d07312c89360ac9229a 23 # Author: Dan Carpenter <dan.carpenter (at] oracle.com> 24 # Date: Thu Jun 16 15:48:57 2016 +0100 25 # 26 # KEYS: potential uninitialized variable 27 # 28 29 TST_SETUP=setup 30 TST_CLEANUP=cleanup 31 TST_TESTFUNC=do_test 32 TST_NEEDS_ROOT=1 33 TST_NEEDS_TMPDIR=1 34 TST_NEEDS_CMDS="keyctl" 35 . tst_test.sh 36 37 check_keyctl() 38 { 39 local nosup 40 for op in $@; do 41 nosup=0 42 43 if ! keyctl 2>&1 | grep -q "keyctl $op"; then 44 nosup=1 45 fi 46 47 if [ "$op" = "request2" ]; then 48 local key=`keyctl request2 user debug:foo bar` 49 if [ $? -ne 0 ]; then 50 nosup=1 51 fi 52 fi 53 54 if [ "$op" = "unlink" ]; then 55 if ! keyctl unlink $key @s; then 56 nosup=1 57 fi 58 fi 59 60 if [ $nosup -ne 0 ]; then 61 tst_brk TCONF "keyctl operation $op not supported" 62 fi 63 done 64 } 65 66 setup() 67 { 68 check_keyctl negate request2 show unlink 69 70 PATH_KEYSTAT="/proc/key-users" 71 PATH_KEYQUOTA="/proc/sys/kernel/keys/root_maxbytes" 72 73 if [ ! -f "$PATH_KEYSTAT" ] || [ ! -f "$PATH_KEYQUOTA" ]; then 74 tst_brk TCONF "'${PATH_KEYSTAT}' or '${PATH_KEYQUOTA}' \ 75 does not exist" 76 fi 77 78 ORIG_KEYSZ=`awk -F' +|/' '/ 0:/ {print $8}' $PATH_KEYSTAT` 79 ORIG_MAXKEYSZ=`cat $PATH_KEYQUOTA` 80 } 81 82 cleanup() 83 { 84 if [ -n "$ORIG_MAXKEYSZ" ]; then 85 echo $ORIG_MAXKEYSZ >$PATH_KEYQUOTA 86 fi 87 } 88 89 do_test() 90 { 91 local quota_excd=0 92 local maxkeysz=$((ORIG_KEYSZ + 100)) 93 94 while [ $maxkeysz -ge 0 ] 95 do 96 echo $maxkeysz >$PATH_KEYQUOTA 97 98 keyctl request2 user debug:fred negate @t >temp 2>&1 99 grep -q -E "quota exceeded" temp 100 if [ $? -eq 0 ]; then 101 quota_excd=1 102 break 103 fi 104 105 local key=`keyctl show | awk '/debug:fred/ {print $1}'` 106 if [ -z "$key" ]; then 107 key=`keyctl show | \ 108 awk -F ':' '/inaccessible/ {print $1}'` 109 fi 110 111 if [ -n "$key" ]; then 112 keyctl unlink $key @s >/dev/null 113 tst_sleep 50ms 114 fi 115 116 ((maxkeysz -= 4)) 117 done 118 119 if [ $quota_excd -eq 0 ]; then 120 tst_res TWARN "Failed to trigger the quota excess" 121 fi 122 123 tst_res TPASS "Bug not reproduced" 124 } 125 126 tst_run 127
