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Date: Sat, 18 May 2024 22:23:54 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Kees Cook <keescook@...omium.org>
Cc: Shuah Khan <shuah@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>,
linux-rtc@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] selftests: rtc: rtctest: Do not open-code
TEST_HARNESS_MAIN
On 17/05/2024 17:16:58-0700, Kees Cook wrote:
> Argument processing is specific to the test harness code. Any optional
> information needs to be passed via environment variables. Move alternate
> path to the RTC_DEV environment variable. Also do not open-code
> TEST_HARNESS_MAIN because its definition may change.
Th main issue doing that is that this breaks the main use case of
rtctest as /dev/rtc1 is usually the main target for those tests. Having
the RTC_DEV environment variable only documented n this commit message
is definitively not enough, I'm going to have to handle zillion of
complaints that this is not working anymore.
>
> Additionally, setup checking can be done in the FIXTURE_SETUP(). With
> this adjustment, also improve the error reporting when the device cannot
> be opened.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: linux-rtc@...r.kernel.org
> Cc: linux-kselftest@...r.kernel.org
> ---
> tools/testing/selftests/rtc/Makefile | 2 +-
> tools/testing/selftests/rtc/rtctest.c | 66 +++++----------------------
> 2 files changed, 13 insertions(+), 55 deletions(-)
>
> diff --git a/tools/testing/selftests/rtc/Makefile b/tools/testing/selftests/rtc/Makefile
> index 55198ecc04db..654f9d58da3c 100644
> --- a/tools/testing/selftests/rtc/Makefile
> +++ b/tools/testing/selftests/rtc/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> -CFLAGS += -O3 -Wl,-no-as-needed -Wall
> +CFLAGS += -O3 -Wl,-no-as-needed -Wall $(KHDR_INCLUDES)
> LDLIBS += -lrt -lpthread -lm
>
> TEST_GEN_PROGS = rtctest
> diff --git a/tools/testing/selftests/rtc/rtctest.c b/tools/testing/selftests/rtc/rtctest.c
> index 63ce02d1d5cc..41cfefcc20e1 100644
> --- a/tools/testing/selftests/rtc/rtctest.c
> +++ b/tools/testing/selftests/rtc/rtctest.c
> @@ -30,7 +30,18 @@ FIXTURE(rtc) {
> };
>
> FIXTURE_SETUP(rtc) {
> + char *alternate = getenv("RTC_DEV");
> +
> + if (alternate)
> + rtc_file = alternate;
> +
> self->fd = open(rtc_file, O_RDONLY);
> +
> + if (self->fd == -1 && errno == ENOENT)
> + SKIP(return, "Skipping test since %s does not exist", rtc_file);
> + EXPECT_NE(-1, self->fd) {
> + TH_LOG("%s: %s\n", rtc_file, strerror(errno));
> + }
> }
>
> FIXTURE_TEARDOWN(rtc) {
> @@ -41,10 +52,6 @@ TEST_F(rtc, date_read) {
> int rc;
> struct rtc_time rtc_tm;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> /* Read the RTC time/date */
> rc = ioctl(self->fd, RTC_RD_TIME, &rtc_tm);
> ASSERT_NE(-1, rc);
> @@ -88,10 +95,6 @@ TEST_F_TIMEOUT(rtc, date_read_loop, READ_LOOP_DURATION_SEC + 2) {
> struct rtc_time rtc_tm;
> time_t start_rtc_read, prev_rtc_read;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> TH_LOG("Continuously reading RTC time for %ds (with %dms breaks after every read).",
> READ_LOOP_DURATION_SEC, READ_LOOP_SLEEP_MS);
>
> @@ -126,10 +129,6 @@ TEST_F_TIMEOUT(rtc, uie_read, NUM_UIE + 2) {
> int i, rc, irq = 0;
> unsigned long data;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> /* Turn on update interrupts */
> rc = ioctl(self->fd, RTC_UIE_ON, 0);
> if (rc == -1) {
> @@ -155,10 +154,6 @@ TEST_F(rtc, uie_select) {
> int i, rc, irq = 0;
> unsigned long data;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> /* Turn on update interrupts */
> rc = ioctl(self->fd, RTC_UIE_ON, 0);
> if (rc == -1) {
> @@ -198,10 +193,6 @@ TEST_F(rtc, alarm_alm_set) {
> time_t secs, new;
> int rc;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> rc = ioctl(self->fd, RTC_RD_TIME, &tm);
> ASSERT_NE(-1, rc);
>
> @@ -256,10 +247,6 @@ TEST_F(rtc, alarm_wkalm_set) {
> time_t secs, new;
> int rc;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
> ASSERT_NE(-1, rc);
>
> @@ -308,10 +295,6 @@ TEST_F_TIMEOUT(rtc, alarm_alm_set_minute, 65) {
> time_t secs, new;
> int rc;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> rc = ioctl(self->fd, RTC_RD_TIME, &tm);
> ASSERT_NE(-1, rc);
>
> @@ -366,10 +349,6 @@ TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
> time_t secs, new;
> int rc;
>
> - if (self->fd == -1 && errno == ENOENT)
> - SKIP(return, "Skipping test since %s does not exist", rtc_file);
> - ASSERT_NE(-1, self->fd);
> -
> rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
> ASSERT_NE(-1, rc);
>
> @@ -410,25 +389,4 @@ TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
> ASSERT_EQ(new, secs);
> }
>
> -static void __attribute__((constructor))
> -__constructor_order_last(void)
> -{
> - if (!__constructor_order)
> - __constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
> -}
> -
> -int main(int argc, char **argv)
> -{
> - switch (argc) {
> - case 2:
> - rtc_file = argv[1];
> - /* FALLTHROUGH */
> - case 1:
> - break;
> - default:
> - fprintf(stderr, "usage: %s [rtcdev]\n", argv[0]);
> - return 1;
> - }
> -
> - return test_harness_run(argc, argv);
> -}
> +TEST_HARNESS_MAIN
> --
> 2.34.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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