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test_sysctl: add simple proc_dointvec() case

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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.

Link: http://lkml.kernel.org/r/20170630224431.17374-5-mcgrof@kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luis R. Rodriguez 2017-07-12 14:33:52 -07:00 • committed by Linus Torvalds
parent 1c0357c846
commit eb965eda1c
2 changed files with 73 additions and 0 deletions
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11
lib/test_sysctl.c
View file

@ -41,11 +41,15 @@ static int i_one_hundred = 100;
struct test_sysctl_data { struct test_sysctl_data {
int int_0001; int int_0001;
int int_0002;
char string_0001[65]; char string_0001[65];
}; };
static struct test_sysctl_data test_data = { static struct test_sysctl_data test_data = {
.int_0001 = 60, .int_0001 = 60,
.int_0002 = 1,
.string_0001 = "(none)", .string_0001 = "(none)",
}; };
@ -60,6 +64,13 @@ static struct ctl_table test_table[] = {
.extra1 = &i_zero, .extra1 = &i_zero,
.extra2 = &i_one_hundred, .extra2 = &i_one_hundred,
}, },
{
.procname = "int_0002",
.data = &test_data.int_0002,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ {
.procname = "string_0001", .procname = "string_0001",
.data = &test_data.string_0001, .data = &test_data.string_0001,

62
tools/testing/selftests/sysctl/sysctl.sh
View file

@ -31,6 +31,7 @@ TEST_FILE=$(mktemp)
# we have tons of space. # we have tons of space.
ALL_TESTS="0001:1:1" ALL_TESTS="0001:1:1"
ALL_TESTS="$ALL_TESTS 0002:1:1" ALL_TESTS="$ALL_TESTS 0002:1:1"
ALL_TESTS="$ALL_TESTS 0003:1:1"
test_modprobe() test_modprobe()
{ {
@ -82,6 +83,9 @@ function check_production_sysctl_writes_strict()
if [ -z $MAX_DIGITS ]; then if [ -z $MAX_DIGITS ]; then
MAX_DIGITS=$(($PAGE_SIZE/8)) MAX_DIGITS=$(($PAGE_SIZE/8))
fi fi
if [ -z $INT_MAX ]; then
INT_MAX=$(getconf INT_MAX)
fi
} }
test_reqs() test_reqs()
@ -122,6 +126,9 @@ reset_vals()
int_0001) int_0001)
VAL="60" VAL="60"
;; ;;
int_0002)
VAL="1"
;;
string_0001) string_0001)
VAL="(none)" VAL="(none)"
;; ;;
@ -296,6 +303,48 @@ run_limit_digit()
test_rc 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() run_stringtests()
{ {
echo -n "Writing entire sysctl in short writes ... " echo -n "Writing entire sysctl in short writes ... "
@ -389,6 +438,18 @@ sysctl_test_0002()
run_stringtests 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() list_tests()
{ {
echo "Test ID list:" echo "Test ID list:"
@ -399,6 +460,7 @@ list_tests()
echo echo
echo "0001 x $(get_test_count 0001) - tests proc_dointvec_minmax()" echo "0001 x $(get_test_count 0001) - tests proc_dointvec_minmax()"
echo "0002 x $(get_test_count 0002) - tests proc_dostring()" echo "0002 x $(get_test_count 0002) - tests proc_dostring()"
echo "0003 x $(get_test_count 0003) - tests proc_dointvec()"
} }
test_reqs test_reqs