1 #!/bin/sh 2 3 SYSCTL="/proc/sys" 4 TARGET="${SYSCTL}/kernel/domainname" 5 ORIG=$(cat "${TARGET}") 6 TEST_STR="Testing sysctl" 7 8 . ./common_tests 9 10 # Only string sysctls support seeking/appending. 11 MAXLEN=65 12 13 echo -n "Writing entire sysctl in short writes ... " 14 set_orig 15 dd if="${TEST_FILE}" of="${TARGET}" bs=1 2>/dev/null 16 if ! verify "${TARGET}"; then 17 echo "FAIL" >&2 18 rc=1 19 else 20 echo "ok" 21 fi 22 23 echo -n "Writing middle of sysctl after unsynchronized seek ... " 24 set_test 25 dd if="${TEST_FILE}" of="${TARGET}" bs=1 seek=1 2>/dev/null 26 if verify "${TARGET}"; then 27 echo "FAIL" >&2 28 rc=1 29 else 30 echo "ok" 31 fi 32 33 echo -n "Checking sysctl maxlen is at least $MAXLEN ... " 34 set_orig 35 perl -e 'print "A" x ('"${MAXLEN}"'-2), "B";' | \ 36 dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null 37 if ! grep -q B "${TARGET}"; then 38 echo "FAIL" >&2 39 rc=1 40 else 41 echo "ok" 42 fi 43 44 echo -n "Checking sysctl keeps original string on overflow append ... " 45 set_orig 46 perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \ 47 dd of="${TARGET}" bs=$(( MAXLEN - 1 )) 2>/dev/null 48 if grep -q B "${TARGET}"; then 49 echo "FAIL" >&2 50 rc=1 51 else 52 echo "ok" 53 fi 54 55 echo -n "Checking sysctl stays NULL terminated on write ... " 56 set_orig 57 perl -e 'print "A" x ('"${MAXLEN}"'-1), "B";' | \ 58 dd of="${TARGET}" bs="${MAXLEN}" 2>/dev/null 59 if grep -q B "${TARGET}"; then 60 echo "FAIL" >&2 61 rc=1 62 else 63 echo "ok" 64 fi 65 66 echo -n "Checking sysctl stays NULL terminated on overwrite ... " 67 set_orig 68 perl -e 'print "A" x ('"${MAXLEN}"'-1), "BB";' | \ 69 dd of="${TARGET}" bs=$(( $MAXLEN + 1 )) 2>/dev/null 70 if grep -q B "${TARGET}"; then 71 echo "FAIL" >&2 72 rc=1 73 else 74 echo "ok" 75 fi 76 77 exit $rc 78
