@@ -9581,6 +9581,7 @@ LINUX KERNEL DUMP TEST MODULE (LKDTM)
M: Kees Cook <keescook@chromium.org>
S: Maintained
F: drivers/misc/lkdtm/*
+F: tools/testing/selftests/lkdtm/*
LINUX KERNEL MEMORY CONSISTENCY MODEL (LKMM)
M: Alan Stern <stern@rowland.harvard.edu>
@@ -26,6 +26,7 @@ TARGETS += kexec
TARGETS += kvm
TARGETS += lib
TARGETS += livepatch
+TARGETS += lkdtm
TARGETS += membarrier
TARGETS += memfd
TARGETS += memory-hotplug
@@ -143,11 +144,13 @@ else
endif
all: khdr
- @for TARGET in $(TARGETS); do \
- BUILD_TARGET=$$BUILD/$$TARGET; \
- mkdir $$BUILD_TARGET -p; \
- $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET;\
- done;
+ @ret=1; \
+ for TARGET in $(TARGETS); do \
+ BUILD_TARGET=$$BUILD/$$TARGET; \
+ mkdir $$BUILD_TARGET -p; \
+ $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET; \
+ ret=$$((ret * $$?)); \
+ done; exit $$ret;
run_tests: all
@for TARGET in $(TARGETS); do \
@@ -196,10 +199,12 @@ ifdef INSTALL_PATH
install -m 744 kselftest/module.sh $(INSTALL_PATH)/kselftest/
install -m 744 kselftest/runner.sh $(INSTALL_PATH)/kselftest/
install -m 744 kselftest/prefix.pl $(INSTALL_PATH)/kselftest/
- @for TARGET in $(TARGETS); do \
+ @ret=1; \
+ for TARGET in $(TARGETS); do \
BUILD_TARGET=$$BUILD/$$TARGET; \
$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET INSTALL_PATH=$(INSTALL_PATH)/$$TARGET install; \
- done;
+ ret=$$((ret * $$?)); \
+ done; exit $$ret;
@# Ask all targets to emit their test scripts
echo "#!/bin/sh" > $(ALL_SCRIPT)
@@ -369,7 +369,7 @@ static void *dummy_thread_fn(void *arg)
static int test_cgcore_proc_migration(const char *root)
{
int ret = KSFT_FAIL;
- int t, c_threads, n_threads = 13;
+ int t, c_threads = 0, n_threads = 13;
char *src = NULL, *dst = NULL;
pthread_t threads[n_threads];
@@ -30,7 +30,7 @@ ftrace_filter_check '*schedule*' '^.*schedule.*$'
ftrace_filter_check 'schedule*' '^schedule.*$'
# filter by *mid*end
-ftrace_filter_check '*aw*lock' '.*aw.*lock$'
+ftrace_filter_check '*pin*lock' '.*pin.*lock$'
# filter by start*mid*
ftrace_filter_check 'mutex*try*' '^mutex.*try.*'
@@ -91,7 +91,7 @@ run_one()
run_many()
{
echo "TAP version 13"
- DIR=$(basename "$PWD")
+ DIR="${PWD#${BASE_DIR}/}"
test_num=0
total=$(echo "$@" | wc -w)
echo "1..$total"
@@ -35,7 +35,7 @@ Adding tests
------------
See the common functions.sh file for the existing collection of utility
-functions, most importantly set_dynamic_debug() and check_result(). The
+functions, most importantly setup_config() and check_result(). The
latter function greps the kernel's ring buffer for "livepatch:" and
"test_klp" strings, so tests be sure to include one of those strings for
result comparison. Other utility functions include general module
@@ -64,7 +64,6 @@ function set_dynamic_debug() {
}
function set_ftrace_enabled() {
- local sysctl="$1"
result=$(sysctl kernel.ftrace_enabled="$1" 2>&1 | paste --serial --delimiters=' ')
echo "livepatch: $result" > /dev/kmsg
}
new file mode 100644
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for LKDTM regression tests
+
+include ../lib.mk
+
+# NOTE: $(OUTPUT) won't get default value if used before lib.mk
+TEST_FILES := tests.txt
+TEST_GEN_PROGS = $(patsubst %,$(OUTPUT)/%.sh,$(shell awk '{print $$1}' tests.txt | sed -e 's/\#//'))
+all: $(TEST_GEN_PROGS)
+
+$(OUTPUT)/%: run.sh tests.txt
+ install -m 0744 run.sh $@
new file mode 100644
@@ -0,0 +1 @@
+CONFIG_LKDTM=y
new file mode 100755
@@ -0,0 +1,92 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# This reads tests.txt for the list of LKDTM tests to invoke. Any marked
+# with a leading "#" are skipped. The rest of the line after the
+# test name is either the text to look for in dmesg for a "success",
+# or the rationale for why a test is marked to be skipped.
+#
+set -e
+TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT
+KSELFTEST_SKIP_TEST=4
+
+# Verify we have LKDTM available in the kernel.
+if [ ! -r $TRIGGER ] ; then
+ /sbin/modprobe -q lkdtm || true
+ if [ ! -r $TRIGGER ] ; then
+ echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"
+ else
+ echo "Cannot write $TRIGGER (need to run as root?)"
+ fi
+ # Skip this test
+ exit $KSELFTEST_SKIP_TEST
+fi
+
+# Figure out which test to run from our script name.
+test=$(basename $0 .sh)
+# Look up details about the test from master list of LKDTM tests.
+line=$(egrep '^#?'"$test"'\b' tests.txt)
+if [ -z "$line" ]; then
+ echo "Skipped: missing test '$test' in tests.txt"
+ exit $KSELFTEST_SKIP_TEST
+fi
+# Check that the test is known to LKDTM.
+if ! egrep -q '^'"$test"'$' "$TRIGGER" ; then
+ echo "Skipped: test '$test' missing in $TRIGGER!"
+ exit $KSELFTEST_SKIP_TEST
+fi
+
+# Extract notes/expected output from test list.
+test=$(echo "$line" | cut -d" " -f1)
+if echo "$line" | grep -q ' ' ; then
+ expect=$(echo "$line" | cut -d" " -f2-)
+else
+ expect=""
+fi
+
+# If the test is commented out, report a skip
+if echo "$test" | grep -q '^#' ; then
+ test=$(echo "$test" | cut -c2-)
+ if [ -z "$expect" ]; then
+ expect="crashes entire system"
+ fi
+ echo "Skipping $test: $expect"
+ exit $KSELFTEST_SKIP_TEST
+fi
+
+# If no expected output given, assume an Oops with back trace is success.
+if [ -z "$expect" ]; then
+ expect="call trace:"
+fi
+
+# Clear out dmesg for output reporting
+dmesg -c >/dev/null
+
+# Prepare log for report checking
+LOG=$(mktemp --tmpdir -t lkdtm-XXXXXX)
+cleanup() {
+ rm -f "$LOG"
+}
+trap cleanup EXIT
+
+# Most shells yell about signals and we're expecting the "cat" process
+# to usually be killed by the kernel. So we have to run it in a sub-shell
+# and silence errors.
+($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) || true
+
+# Record and dump the results
+dmesg -c >"$LOG"
+cat "$LOG"
+# Check for expected output
+if egrep -qi "$expect" "$LOG" ; then
+ echo "$test: saw '$expect': ok"
+ exit 0
+else
+ if egrep -qi XFAIL: "$LOG" ; then
+ echo "$test: saw 'XFAIL': [SKIP]"
+ exit $KSELFTEST_SKIP_TEST
+ else
+ echo "$test: missing '$expect': [FAIL]"
+ exit 1
+ fi
+fi
new file mode 100644
@@ -0,0 +1,71 @@
+#PANIC
+BUG kernel BUG at
+WARNING WARNING:
+WARNING_MESSAGE message trigger
+EXCEPTION
+#LOOP Hangs the system
+#EXHAUST_STACK Corrupts memory on failure
+#CORRUPT_STACK Crashes entire system on success
+#CORRUPT_STACK_STRONG Crashes entire system on success
+CORRUPT_LIST_ADD list_add corruption
+CORRUPT_LIST_DEL list_del corruption
+CORRUPT_USER_DS Invalid address limit on user-mode return
+STACK_GUARD_PAGE_LEADING
+STACK_GUARD_PAGE_TRAILING
+UNSET_SMEP CR4 bits went missing
+DOUBLE_FAULT
+UNALIGNED_LOAD_STORE_WRITE
+#OVERWRITE_ALLOCATION Corrupts memory on failure
+#WRITE_AFTER_FREE Corrupts memory on failure
+READ_AFTER_FREE
+#WRITE_BUDDY_AFTER_FREE Corrupts memory on failure
+READ_BUDDY_AFTER_FREE
+SLAB_FREE_DOUBLE
+SLAB_FREE_CROSS
+SLAB_FREE_PAGE
+#SOFTLOCKUP Hangs the system
+#HARDLOCKUP Hangs the system
+#SPINLOCKUP Hangs the system
+#HUNG_TASK Hangs the system
+EXEC_DATA
+EXEC_STACK
+EXEC_KMALLOC
+EXEC_VMALLOC
+EXEC_RODATA
+EXEC_USERSPACE
+EXEC_NULL
+ACCESS_USERSPACE
+ACCESS_NULL
+WRITE_RO
+WRITE_RO_AFTER_INIT
+WRITE_KERN
+REFCOUNT_INC_OVERFLOW
+REFCOUNT_ADD_OVERFLOW
+REFCOUNT_INC_NOT_ZERO_OVERFLOW
+REFCOUNT_ADD_NOT_ZERO_OVERFLOW
+REFCOUNT_DEC_ZERO
+REFCOUNT_DEC_NEGATIVE Negative detected: saturated
+REFCOUNT_DEC_AND_TEST_NEGATIVE Negative detected: saturated
+REFCOUNT_SUB_AND_TEST_NEGATIVE Negative detected: saturated
+REFCOUNT_INC_ZERO
+REFCOUNT_ADD_ZERO
+REFCOUNT_INC_SATURATED Saturation detected: still saturated
+REFCOUNT_DEC_SATURATED Saturation detected: still saturated
+REFCOUNT_ADD_SATURATED Saturation detected: still saturated
+REFCOUNT_INC_NOT_ZERO_SATURATED
+REFCOUNT_ADD_NOT_ZERO_SATURATED
+REFCOUNT_DEC_AND_TEST_SATURATED Saturation detected: still saturated
+REFCOUNT_SUB_AND_TEST_SATURATED Saturation detected: still saturated
+#REFCOUNT_TIMING timing only
+#ATOMIC_TIMING timing only
+USERCOPY_HEAP_SIZE_TO
+USERCOPY_HEAP_SIZE_FROM
+USERCOPY_HEAP_WHITELIST_TO
+USERCOPY_HEAP_WHITELIST_FROM
+USERCOPY_STACK_FRAME_TO
+USERCOPY_STACK_FRAME_FROM
+USERCOPY_STACK_BEYOND
+USERCOPY_KERNEL
+USERCOPY_KERNEL_DS
+STACKLEAK_ERASING OK: the rest of the thread stack is properly erased
+CFI_FORWARD_PROTO
@@ -11,23 +11,35 @@
* own execution. It also attempts to have as few dependencies
* on kernel features as possible.
*
- * It should be statically linked, with startup libs avoided.
- * It uses no library calls, and only the following 3 syscalls:
+ * It should be statically linked, with startup libs avoided. It uses
+ * no library calls except the syscall() function for the following 3
+ * syscalls:
* sysinfo(), write(), and _exit()
*
* For output, it avoids printf (which in some C libraries
* has large external dependencies) by implementing it's own
* number output and print routines, and using __builtin_strlen()
+ *
+ * The test may crash if any of the above syscalls fails because in some
+ * libc implementations (e.g. the GNU C Library) errno is saved in
+ * thread-local storage, which does not get initialized due to avoiding
+ * startup libs.
*/
#include <sys/sysinfo.h>
#include <unistd.h>
+#include <sys/syscall.h>
#define STDOUT_FILENO 1
static int print(const char *s)
{
- return write(STDOUT_FILENO, s, __builtin_strlen(s));
+ size_t len = 0;
+
+ while (s[len] != '\0')
+ len++;
+
+ return syscall(SYS_write, STDOUT_FILENO, s, len);
}
static inline char *num_to_str(unsigned long num, char *buf, int len)
@@ -79,12 +91,12 @@ void _start(void)
print("TAP version 13\n");
print("# Testing system size.\n");
- ccode = sysinfo(&info);
+ ccode = syscall(SYS_sysinfo, &info);
if (ccode < 0) {
print("not ok 1");
print(test_name);
print(" ---\n reason: \"could not get sysinfo\"\n ...\n");
- _exit(ccode);
+ syscall(SYS_exit, ccode);
}
print("ok 1");
print(test_name);
@@ -100,5 +112,5 @@ void _start(void)
print(" ...\n");
print("1..1\n");
- _exit(0);
+ syscall(SYS_exit, 0);
}
Hi Linus, Please pull the following Kselftest update for Linux 5.6-rc1 This Kselftest update for Linux 5.6-rc1 consists of several fixes to framework and individual tests. In addition, it enables LKDTM tests adding lkdtm target to kselftest Makefile. diff is attached. thanks, -- Shuah ---------------------------------------------------------------- The following changes since commit c79f46a282390e0f5b306007bf7b11a46d529538: Linux 5.5-rc5 (2020-01-05 14:23:27 -0800) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest tags/linux-kselftest-5.6-rc1 for you to fetch changes up to af4ddd607dff7aabd466a4a878e01b9f592a75ab: selftests/ftrace: fix glob selftest (2020-01-28 13:36:48 -0700) ---------------------------------------------------------------- linux-kselftest-5.6-rc1 This Kselftest update for Linux 5.6-rc1 consists of several fixes to framework and individual tests. In addition, it enables LKDTM tests adding lkdtm target to kselftest Makefile. ---------------------------------------------------------------- Cristian Marussi (1): selftests: fix build behaviour on targets' failures Dan Carpenter (1): selftests: Uninitialized variable in test_cgcore_proc_migration() Kees Cook (1): selftests/lkdtm: Add tests for LKDTM targets Matthieu Baerts (1): selftests: settings: tests can be in subsubdirs Miroslav Benes (2): selftests/livepatch: Replace set_dynamic_debug() with setup_config() in README selftests/livepatch: Remove unused local variable in set_ftrace_enabled() Siddhesh Poyarekar (1): kselftest: Minimise dependency of get_size on C library interfaces Sven Schnelle (1): selftests/ftrace: fix glob selftest MAINTAINERS | 1 + tools/testing/selftests/Makefile | 19 +++-- tools/testing/selftests/cgroup/test_core.c | 2 +- .../ftrace/test.d/ftrace/func-filter-glob.tc | 2 +- tools/testing/selftests/kselftest/runner.sh | 2 +- tools/testing/selftests/livepatch/README | 2 +- tools/testing/selftests/livepatch/functions.sh | 1 - tools/testing/selftests/lkdtm/Makefile | 12 +++ tools/testing/selftests/lkdtm/config | 1 + tools/testing/selftests/lkdtm/run.sh | 92 ++++++++++++++++++++++ tools/testing/selftests/lkdtm/tests.txt | 71 +++++++++++++++++ tools/testing/selftests/size/get_size.c | 24 ++++-- 12 files changed, 211 insertions(+), 18 deletions(-) create mode 100644 tools/testing/selftests/lkdtm/Makefile create mode 100644 tools/testing/selftests/lkdtm/config create mode 100755 tools/testing/selftests/lkdtm/run.sh create mode 100644 tools/testing/selftests/lkdtm/tests.txt ----------------------------------------------------------------