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Subject[PATCH v2 4/6] test_sysctl: add simple proc_dointvec() case
Date
Test against a simple proc_dointvec() case.  While at it, add a test
against INT_MAX. Make sure INT_MAX works, and INT_MAX+1 will fail. Also
test negative values work.

Cc: Kees Cook <keescook@chromium.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
lib/test_sysctl.c | 11 ++++++
tools/testing/selftests/sysctl/sysctl.sh | 62 ++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+)

diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
index b2163bfb6eb2..1472e1ae4931 100644
--- a/lib/test_sysctl.c
+++ b/lib/test_sysctl.c
@@ -41,11 +41,15 @@ static int i_one_hundred = 100;

struct test_sysctl_data {
int int_0001;
+ int int_0002;
+
char string_0001[65];
};

static struct test_sysctl_data test_data = {
.int_0001 = 60,
+ .int_0002 = 1,
+
.string_0001 = "(none)",
};

@@ -61,6 +65,13 @@ static struct ctl_table test_table[] = {
.extra2 = &i_one_hundred,
},
{
+ .procname = "int_0002",
+ .data = &test_data.int_0002,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
.procname = "string_0001",
.data = &test_data.string_0001,
.maxlen = sizeof(test_data.string_0001),
diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index 6ec807576f7c..7ba3fa2bbd54 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -31,6 +31,7 @@ TEST_FILE=$(mktemp)
# we have tons of space.
ALL_TESTS="0001:1:1"
ALL_TESTS="$ALL_TESTS 0002:1:1"
+ALL_TESTS="$ALL_TESTS 0003:1:1"

test_modprobe()
{
@@ -82,6 +83,9 @@ function check_production_sysctl_writes_strict()
if [ -z $MAX_DIGITS ]; then
MAX_DIGITS=$(($PAGE_SIZE/8))
fi
+ if [ -z $INT_MAX ]; then
+ INT_MAX=$(getconf INT_MAX)
+ fi
}

test_reqs()
@@ -122,6 +126,9 @@ reset_vals()
int_0001)
VAL="60"
;;
+ int_0002)
+ VAL="1"
+ ;;
string_0001)
VAL="(none)"
;;
@@ -296,6 +303,48 @@ run_limit_digit()
test_rc
}

+# You are using an int
+run_limit_digit_int()
+{
+ echo -n "Testing INT_MAX works ..."
+ reset_vals
+ TEST_STR="$INT_MAX"
+ echo -n $TEST_STR > $TARGET
+
+ if ! verify "${TARGET}"; then
+ echo "FAIL" >&2
+ rc=1
+ else
+ echo "ok"
+ fi
+ test_rc
+
+ echo -n "Testing INT_MAX + 1 will fail as expected..."
+ reset_vals
+ let TEST_STR=$INT_MAX+1
+ echo -n $TEST_STR > $TARGET 2> /dev/null
+
+ if verify "${TARGET}"; then
+ echo "FAIL" >&2
+ rc=1
+ else
+ echo "ok"
+ fi
+ test_rc
+
+ echo -n "Testing negative values will work as expected..."
+ reset_vals
+ TEST_STR="-3"
+ echo -n $TEST_STR > $TARGET 2> /dev/null
+ if ! verify "${TARGET}"; then
+ echo "FAIL" >&2
+ rc=1
+ else
+ echo "ok"
+ fi
+ test_rc
+}
+
run_stringtests()
{
echo -n "Writing entire sysctl in short writes ... "
@@ -389,6 +438,18 @@ sysctl_test_0002()
run_stringtests
}

+sysctl_test_0003()
+{
+ TARGET="${SYSCTL}/int_0002"
+ reset_vals
+ ORIG=$(cat "${TARGET}")
+ TEST_STR=$(( $ORIG + 1 ))
+
+ run_numerictests
+ run_limit_digit
+ run_limit_digit_int
+}
+
list_tests()
{
echo "Test ID list:"
@@ -399,6 +460,7 @@ list_tests()
echo
echo "0001 x $(get_test_count 0001) - tests proc_dointvec_minmax()"
echo "0002 x $(get_test_count 0002) - tests proc_dostring()"
+ echo "0003 x $(get_test_count 0003) - tests proc_dointvec()"
}

test_reqs
--
2.11.0
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