[PATCH] selftests/clone3: Check that the child exited cleanly

[PATCH] selftests/clone3: Check that the child exited cleanly

[Mark Brown]

When the child exits during the clone3() selftest we use WEXITSTATUS() to
get the exit status from the process without first checking WIFEXITED() to
see if the result will be valid. This can lead to incorrect results, for
example if the child exits due to signal. Add a WIFEXTED() check and report
any non-standard exit as a failure, using EXIT_FAILURE as the exit status
for call_clone3() since we otherwise report 0 or negative errnos.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/clone3/clone3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c
index 3c9bf0cd82a8..0e0e5dfa97c6 100644
--- a/tools/testing/selftests/clone3/clone3.c
+++ b/tools/testing/selftests/clone3/clone3.c
@@ -98,6 +98,11 @@ static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode)
 		ksft_print_msg("Child returned %s\n", strerror(errno));
 		return -errno;
 	}
+	if (!WIFEXITED(status)) {
+		ksft_print_msg("Child did not exit normally, status 0x%x\n",
+			       status);
+		return EXIT_FAILURE;
+	}
 	if (WEXITSTATUS(status))
 		return WEXITSTATUS(status);
 

---
base-commit: 39cd87c4eb2b893354f3b850f916353f2658ae6f
change-id: 20240405-kselftest-clone3-signal-1edb1a3f5473

Best regards,
-- 
Mark Brown <broonie@kernel.org>

Re: [PATCH] selftests/clone3: Check that the child exited cleanly

[Shuah Khan]

On 4/9/24 14:39, Mark Brown wrote:
> When the child exits during the clone3() selftest we use WEXITSTATUS() to
> get the exit status from the process without first checking WIFEXITED() to
> see if the result will be valid. This can lead to incorrect results, for
> example if the child exits due to signal. Add a WIFEXTED() check and report
> any non-standard exit as a failure, using EXIT_FAILURE as the exit status
> for call_clone3() since we otherwise report 0 or negative errnos.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
>   tools/testing/selftests/clone3/clone3.c | 5 +++++
>   1 file changed, 5 insertions(+)

Applied to linux-kselftest next for Linux 6.10-rc1.

thanks,
-- Shuah