[PATCH 5.19 0865/1157] selftests/vm: fix errno handling in mrelease_test

Greg Kroah-Hartman
2022-08-16T00:37:45Z

From: Adam Sindelar <adam@wowsignal.io>

[ Upstream commit 3b8e7f5c42d1aa44f71fd219717c80e34101361e ]

mrelease_test should return KSFT_SKIP when process_mrelease is not
defined, but due to a perror call consuming the errno, it returns
KSFT_FAIL.

This patch decides the exit code before calling perror.

[adam@wowsignal.io: fix remaining instances of errno mishandling]
Link: https://lkml.kernel.org/r/20220706141602.10159-1-adam@wowsignal.io
Link: https://lkml.kernel.org/r/20220704173351.19595-1-adam@wowsignal.io
Fixes: 33776141b812 ("selftests: vm: add process_mrelease tests")
Signed-off-by: Adam Sindelar <adam@wowsignal.io>
Reviewed-by: David Vernet <void@manifault.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/vm/mrelease_test.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/vm/mrelease_test.c b/tools/testing/selftests/vm/mrelease_test.c
index 96671c2f7d48..6c62966ab5db 100644
--- a/tools/testing/selftests/vm/mrelease_test.c
+++ b/tools/testing/selftests/vm/mrelease_test.c
@@ -62,19 +62,22 @@ static int alloc_noexit(unsigned long nr_pages, int pipefd)
/* The process_mrelease calls in this test are expected to fail */
static void run_negative_tests(int pidfd)
{
+ int res;
/* Test invalid flags. Expect to fail with EINVAL error code. */
if (!syscall(__NR_process_mrelease, pidfd, (unsigned int)-1) ||
errno != EINVAL) {
+ res = (errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
perror("process_mrelease with wrong flags");
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}
/*
* Test reaping while process is alive with no pending SIGKILL.
* Expect to fail with EINVAL error code.
*/
if (!syscall(__NR_process_mrelease, pidfd, 0) || errno != EINVAL) {
+ res = (errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
perror("process_mrelease on a live process");
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}
}

@@ -100,8 +103,9 @@ int main(void)

/* Test a wrong pidfd */
if (!syscall(__NR_process_mrelease, -1, 0) || errno != EBADF) {
+ res = (errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
perror("process_mrelease with wrong pidfd");
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}

/* Start the test with 1MB child memory allocation */
@@ -156,8 +160,9 @@ int main(void)
run_negative_tests(pidfd);

if (kill(pid, SIGKILL)) {
+ res = (errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
perror("kill");
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}

success = (syscall(__NR_process_mrelease, pidfd, 0) == 0);
@@ -172,9 +177,10 @@ int main(void)
if (errno == ESRCH) {
retry = (size <= MAX_SIZE_MB);
} else {
+ res = (errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
perror("process_mrelease");
waitpid(pid, NULL, 0);
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}
}

--
2.35.1