Merge tag 'linux-kselftest-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest updates from Shuah Khan:
 "This consists of:

   - Several fixes from Masami Hiramatsu to improve coverage for lib and
     sysctl tests.

   - Clean up to vdso test and a new test for getcpu() from Mark Brown.

   - Add new gen_tar selftests Makefile target generate selftest package
     running "make gen_tar" in selftests directory from Veronika
     Kabatova.

   - Other miscellaneous fixes to timens, exec, tpm2 tests"

* tag 'linux-kselftest-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests/sysctl: Make sysctl test driver as a module
  selftests/sysctl: Fix to load test_sysctl module
  lib: Make test_sysctl initialized as module
  lib: Make prime number generator independently selectable
  selftests/ftrace: Return unsupported if no error_log file
  selftests/ftrace: Use printf for backslash included command
  selftests/timens: handle a case when alarm clocks are not supported
  Kernel selftests: Add check if TPM devices are supported
  selftests: vdso: Add a selftest for vDSO getcpu()
  selftests: vdso: Use a header file to prototype parse_vdso API
  selftests: vdso: Rename vdso_test to vdso_test_gettimeofday
  selftests/exec: Verify execve of non-regular files fail
  selftests: introduce gen_tar Makefile target

Documentation/dev-tools/kselftest.rst

@@ -151,6 +151,29 @@ note some tests will require root privileges::
    $ cd kselftest
    $ ./run_kselftest.sh
 
+Packaging selftests
+===================
+
+In some cases packaging is desired, such as when tests need to run on a
+different system. To package selftests, run::
+
+   $ make -C tools/testing/selftests gen_tar
+
+This generates a tarball in the `INSTALL_PATH/kselftest-packages` directory. By
+default, `.gz` format is used. The tar format can be overridden by specifying
+a `FORMAT` make variable. Any value recognized by `tar's auto-compress`_ option
+is supported, such as::
+
+    $ make -C tools/testing/selftests gen_tar FORMAT=.xz
+
+`make gen_tar` invokes `make install` so you can use it to package a subset of
+tests by using variables specified in `Running a subset of selftests`_
+section::
+
+    $ make -C tools/testing/selftests gen_tar TARGETS="bpf" FORMAT=.xz
+
+.. _tar's auto-compress: https://www.gnu.org/software/tar/manual/html_node/gzip.html#auto_002dcompress
+
 Contributing new tests
 ======================
 

lib/math/Kconfig

@@ -6,7 +6,12 @@ config CORDIC
 	  calculations are in fixed point. Module will be called cordic.
 
 config PRIME_NUMBERS
-	tristate
+	tristate "Simple prime number generator for testing"
+	help
+	  This option provides a simple prime number generator for test
+	  modules.
+
+	  If unsure, say N.
 
 config RATIONAL
 	bool

lib/test_sysctl.c

@@ -162,7 +162,7 @@ static int __init test_sysctl_init(void)
 	}
 	return 0;
 }
-late_initcall(test_sysctl_init);
+module_init(test_sysctl_init);
 
 static void __exit test_sysctl_exit(void)
 {

tools/testing/selftests/Makefile

@@ -249,10 +249,17 @@ else
 	$(error Error: set INSTALL_PATH to use install)
 endif
 
+FORMAT ?= .gz
+TAR_PATH = $(abspath ${INSTALL_PATH}/kselftest-packages/kselftest.tar${FORMAT})
+gen_tar: install
+	@mkdir -p ${INSTALL_PATH}/kselftest-packages/
+	@tar caf ${TAR_PATH} --exclude=kselftest-packages -C ${INSTALL_PATH} .
+	@echo "Created ${TAR_PATH}"
+
 clean:
 	@for TARGET in $(TARGETS); do \
 		BUILD_TARGET=$$BUILD/$$TARGET;	\
 		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
 	done;
 
-.PHONY: khdr all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean
+.PHONY: khdr all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean gen_tar

tools/testing/selftests/exec/.gitignore

@@ -9,3 +9,4 @@ execveat.ephemeral
 execveat.denatured
 /recursion-depth
 xxxxxxxx*
+pipe

tools/testing/selftests/exec/Makefile

@@ -5,7 +5,7 @@ CFLAGS += -D_GNU_SOURCE
 
 TEST_PROGS := binfmt_script
 TEST_GEN_PROGS := execveat
-TEST_GEN_FILES := execveat.symlink execveat.denatured script subdir
+TEST_GEN_FILES := execveat.symlink execveat.denatured script subdir pipe
 # Makefile is a run-time dependency, since it's accessed by the execveat test
 TEST_FILES := Makefile
 

tools/testing/selftests/exec/execveat.c

@@ -5,7 +5,9 @@
  * Selftests for execveat(2).
  */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE  /* to get O_PATH, AT_EMPTY_PATH */
+#endif
 #include <sys/sendfile.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
@@ -311,6 +313,10 @@ static int run_tests(void)
 	fail += check_execveat_fail(AT_FDCWD, fullname_symlink,
 				    AT_SYMLINK_NOFOLLOW, ELOOP);
 
+	/*  Non-regular file failure */
+	fail += check_execveat_fail(dot_dfd, "pipe", 0, EACCES);
+	unlink("pipe");
+
 	/* Shell script wrapping executable file: */
 	/*   dfd + path */
 	fail += check_execveat(subdir_dfd, "../script", 0);
@@ -384,6 +390,8 @@ static void prerequisites(void)
 	fd = open("subdir.ephemeral/script", O_RDWR|O_CREAT|O_TRUNC, 0755);
 	write(fd, script, strlen(script));
 	close(fd);
+
+	mkfifo("pipe", 0755);
 }
 
 int main(int argc, char **argv)

tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc

@@ -14,6 +14,8 @@ if [ ! -f set_event ]; then
     exit_unsupported
 fi
 
+[ -f error_log ] || exit_unsupported
+
 ftrace_errlog_check 'event filter parse error' '((sig >= 10 && sig < 15) || dsig ^== 17) && comm != bash' 'events/signal/signal_generate/filter'
 
 exit 0

tools/testing/selftests/ftrace/test.d/functions

@@ -119,12 +119,14 @@ yield() {
     ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
 }
 
+# Since probe event command may include backslash, explicitly use printf "%s"
+# to NOT interpret it.
 ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
-    pos=$(echo -n "${2%^*}" | wc -c) # error position
-    command=$(echo "$2" | tr -d ^)
+    pos=$(printf "%s" "${2%^*}" | wc -c) # error position
+    command=$(printf "%s" "$2" | tr -d ^)
     echo "Test command: $command"
     echo > error_log
-    (! echo "$command" >> "$3" ) 2> /dev/null
+    (! printf "%s" "$command" >> "$3" ) 2> /dev/null
     grep "$1: error:" -A 3 error_log
     N=$(tail -n 1 error_log | wc -c)
     # "  Command: " and "^\n" => 13

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc

@@ -91,7 +91,9 @@ esac
 if grep -q "Create/append/" README && grep -q "imm-value" README; then
 echo 'p:kprobes/testevent _do_fork' > kprobe_events
 check_error '^r:kprobes/testevent do_exit'	# DIFF_PROBE_TYPE
-echo 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events
+
+# Explicitly use printf "%s" to not interpret \1
+printf "%s" 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events
 check_error 'p:kprobes/testevent _do_fork ^bcd=\1'	# DIFF_ARG_TYPE
 check_error 'p:kprobes/testevent _do_fork ^abcd=\1:u8'	# DIFF_ARG_TYPE
 check_error 'p:kprobes/testevent _do_fork ^abcd=\"foo"'	# DIFF_ARG_TYPE

tools/testing/selftests/gen_kselftest_tar.sh

@@ -49,6 +49,11 @@ main()
 	# directory
 	./kselftest_install.sh "$install_dir"
 	(cd "$install_work"; tar $copts "$dest"/kselftest${ext} $install_name)
+
+	# Don't put the message at the actual end as people may be parsing the
+	# "archive created" line in their scripts.
+	echo -e "\nConsider using 'make gen_tar' instead of this script\n"
+
 	echo "Kselftest archive kselftest${ext} created!"
 
 	# clean up top-level install work directory

tools/testing/selftests/sysctl/config

@@ -1 +1 @@
-CONFIG_TEST_SYSCTL=y
+CONFIG_TEST_SYSCTL=m

tools/testing/selftests/sysctl/sysctl.sh

@@ -41,16 +41,6 @@ ALL_TESTS="$ALL_TESTS 0005:3:1:int_0003"
 ALL_TESTS="$ALL_TESTS 0006:50:1:bitmap_0001"
 ALL_TESTS="$ALL_TESTS 0007:1:1:boot_int"
 
-test_modprobe()
-{
-       if [ ! -d $DIR ]; then
-               echo "$0: $DIR not present" >&2
-               echo "You must have the following enabled in your kernel:" >&2
-               cat $TEST_DIR/config >&2
-               exit $ksft_skip
-       fi
-}
-
 function allow_user_defaults()
 {
 	if [ -z $DIR ]; then
@@ -126,10 +116,12 @@ function load_req_mod()
 	if [ ! -d $SYSCTL ]; then
 		if ! modprobe -q -n $TEST_DRIVER; then
 			echo "$0: module $TEST_DRIVER not found [SKIP]"
+			echo "You must set CONFIG_TEST_SYSCTL=m in your kernel" >&2
 			exit $ksft_skip
 		fi
 		modprobe $TEST_DRIVER
 		if [ $? -ne 0 ]; then
+			echo "$0: modprobe $TEST_DRIVER failed."
 			exit
 		fi
 	fi
@@ -971,7 +963,6 @@ test_reqs
 allow_user_defaults
 check_production_sysctl_writes_strict
 load_req_mod
-test_modprobe
 
 trap "test_finish" EXIT
 

tools/testing/selftests/timens/clock_nanosleep.c

@@ -119,7 +119,7 @@ int main(int argc, char *argv[])
 
 	ksft_set_plan(4);
 
-	check_config_posix_timers();
+	check_supported_timers();
 
 	if (unshare_timens())
 		return 1;

tools/testing/selftests/timens/timens.c

@@ -155,7 +155,7 @@ int main(int argc, char *argv[])
 
 	nscheck();
 
-	check_config_posix_timers();
+	check_supported_timers();
 
 	ksft_set_plan(ARRAY_SIZE(clocks) * 2);
 

tools/testing/selftests/timens/timens.h

@@ -14,15 +14,26 @@
 #endif
 
 static int config_posix_timers = true;
+static int config_alarm_timers = true;
 
-static inline void check_config_posix_timers(void)
+static inline void check_supported_timers(void)
 {
+	struct timespec ts;
+
 	if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
 		config_posix_timers = false;
+
+	if (clock_gettime(CLOCK_BOOTTIME_ALARM, &ts) == -1 && errno == EINVAL)
+		config_alarm_timers = false;
 }
 
 static inline bool check_skip(int clockid)
 {
+	if (!config_alarm_timers && clockid == CLOCK_BOOTTIME_ALARM) {
+		ksft_test_result_skip("CLOCK_BOOTTIME_ALARM isn't supported\n");
+		return true;
+	}
+
 	if (config_posix_timers)
 		return false;
 

tools/testing/selftests/timens/timer.c

@@ -22,6 +22,9 @@ int run_test(int clockid, struct timespec now)
 	timer_t fd;
 	int i;
 
+	if (check_skip(clockid))
+		return 0;
+
 	for (i = 0; i < 2; i++) {
 		struct sigevent sevp = {.sigev_notify = SIGEV_NONE};
 		int flags = 0;
@@ -74,6 +77,8 @@ int main(int argc, char *argv[])
 
 	nscheck();
 
+	check_supported_timers();
+
 	ksft_set_plan(3);
 
 	clock_gettime(CLOCK_MONOTONIC, &mtime_now);

tools/testing/selftests/timens/timerfd.c

@@ -28,6 +28,9 @@ int run_test(int clockid, struct timespec now)
 	long long elapsed;
 	int fd, i;
 
+	if (check_skip(clockid))
+		return 0;
+
 	if (tclock_gettime(clockid, &now))
 		return pr_perror("clock_gettime(%d)", clockid);
 
@@ -81,6 +84,8 @@ int main(int argc, char *argv[])
 
 	nscheck();
 
+	check_supported_timers();
+
 	ksft_set_plan(3);
 
 	clock_gettime(CLOCK_MONOTONIC, &mtime_now);

tools/testing/selftests/tpm2/test_smoke.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+[ -f /dev/tpm0 ] || exit $ksft_skip
+
 python -m unittest -v tpm2_tests.SmokeTest
 python -m unittest -v tpm2_tests.AsyncTest
 

tools/testing/selftests/tpm2/test_space.sh

@@ -1,4 +1,9 @@
 #!/bin/bash
 # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+[ -f /dev/tpmrm0 ] || exit $ksft_skip
+
 python -m unittest -v tpm2_tests.SpaceTest