From 1c0357c846452add7c2c863ec372010e3d2ca943 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Wed, 12 Jul 2017 14:33:49 -0700 Subject: test_sysctl: test against PAGE_SIZE for int Add the following tests to ensure we do not regress: o Test using a buffer full of space (PAGE_SIZE-1) followed by a single digit works o Test using a buffer full of spaces (PAGE_SIZE or over) will fail As tests increase instead of unloading the module and reloading it we can just do a shell reset_vals() with a reset to values we know are set at init on the driver. Link: http://lkml.kernel.org/r/20170630224431.17374-4-mcgrof@kernel.org Signed-off-by: Luis R. Rodriguez Cc: Kees Cook Cc: "Eric W. Biederman" Cc: Shuah Khan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- tools/testing/selftests/sysctl/sysctl.sh | 66 ++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) (limited to 'tools') diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh index cbe1345d7c1d..6ec807576f7c 100644 --- a/tools/testing/selftests/sysctl/sysctl.sh +++ b/tools/testing/selftests/sysctl/sysctl.sh @@ -75,6 +75,13 @@ function check_production_sysctl_writes_strict() echo "1" > ${WRITES_STRICT} fi fi + + if [ -z $PAGE_SIZE ]; then + PAGE_SIZE=$(getconf PAGESIZE) + fi + if [ -z $MAX_DIGITS ]; then + MAX_DIGITS=$(($PAGE_SIZE/8)) + fi } test_reqs() @@ -89,6 +96,10 @@ test_reqs() echo "$0: You need perl installed" exit 1 fi + if ! which getconf 2> /dev/null > /dev/null; then + echo "$0: You need getconf installed" + exit 1 + fi } function load_req_mod() @@ -103,6 +114,23 @@ function load_req_mod() fi } +reset_vals() +{ + VAL="" + TRIGGER=$(basename ${TARGET}) + case "$TRIGGER" in + int_0001) + VAL="60" + ;; + string_0001) + VAL="(none)" + ;; + *) + ;; + esac + echo -n $VAL > $TARGET +} + set_orig() { if [ ! -z $TARGET ]; then @@ -229,7 +257,42 @@ run_numerictests() else echo "ok" fi + test_rc +} + +# Your test must accept digits 3 and 4 to use this +run_limit_digit() +{ + echo -n "Checking ignoring spaces up to PAGE_SIZE works on write ..." + reset_vals + LIMIT=$((MAX_DIGITS -1)) + TEST_STR="3" + (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ + dd of="${TARGET}" 2>/dev/null + + if ! verify "${TARGET}"; then + echo "FAIL" >&2 + rc=1 + else + echo "ok" + fi + test_rc + + echo -n "Checking passing PAGE_SIZE of spaces fails on write ..." + reset_vals + + LIMIT=$((MAX_DIGITS)) + TEST_STR="4" + (perl -e 'print " " x '$LIMIT';'; echo "${TEST_STR}") | \ + dd of="${TARGET}" 2>/dev/null + + if verify "${TARGET}"; then + echo "FAIL" >&2 + rc=1 + else + echo "ok" + fi test_rc } @@ -305,15 +368,18 @@ run_stringtests() sysctl_test_0001() { TARGET="${SYSCTL}/int_0001" + reset_vals ORIG=$(cat "${TARGET}") TEST_STR=$(( $ORIG + 1 )) run_numerictests + run_limit_digit } sysctl_test_0002() { TARGET="${SYSCTL}/string_0001" + reset_vals ORIG=$(cat "${TARGET}") TEST_STR="Testing sysctl" # Only string sysctls support seeking/appending. -- cgit v1.2.3