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 <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>
diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index cbe1345..6ec8075 100644
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -75,6 +75,13 @@
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 @@
echo "$0: You need perl installed"
exit 1
fi
+ if ! which getconf 2> /dev/null > /dev/null; then
+ echo "$0: You need getconf installed"
+ exit 1
+ fi
}
function load_req_mod()
@@ -103,6 +114,23 @@
fi
}
+reset_vals()
+{
+ VAL=""
+ TRIGGER=$(basename ${TARGET})
+ case "$TRIGGER" in
+ int_0001)
+ VAL="60"
+ ;;
+ string_0001)
+ VAL="(none)"
+ ;;
+ *)
+ ;;
+ esac
+ echo -n $VAL > $TARGET
+}
+
set_orig()
{
if [ ! -z $TARGET ]; then
@@ -229,7 +257,42 @@
else
echo "ok"
fi
+ test_rc
+}
+# Your test must accept digits 3 and 4 to use this
+run_limit_digit()
+{
+ echo -n "Checking ignoring spaces up to PAGE_SIZE works on write ..."
+ reset_vals
+
+ LIMIT=$((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 "${TARGET}"; then
+ echo "FAIL" >&2
+ rc=1
+ else
+ echo "ok"
+ fi
test_rc
}
@@ -305,15 +368,18 @@
sysctl_test_0001()
{
TARGET="${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.