Add a test to verify that CLOSE_RANGE_UNSHARE works correctly when combined
with CLOSE_RANGE_CLOEXEC for the single-threaded case.
Cc: Giuseppe Scrivano <gscrivan@xxxxxxxxxx>
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
---
.../testing/selftests/core/close_range_test.c | 70 +++++++++++++++++++
1 file changed, 70 insertions(+)
diff --git a/tools/testing/selftests/core/close_range_test.c b/tools/testing/selftests/core/close_range_test.c
index bc592a1372bb..862444f1c244 100644
--- a/tools/testing/selftests/core/close_range_test.c
+++ b/tools/testing/selftests/core/close_range_test.c
@@ -313,5 +313,75 @@ TEST(close_range_cloexec)
}
}
+TEST(close_range_cloexec_unshare)
+{
+ int i, ret;
+ int open_fds[101];
+ struct rlimit rlimit;
+
+ for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+ int fd;
+
+ fd = open("/dev/null", O_RDONLY);
+ ASSERT_GE(fd, 0) {
+ if (errno == ENOENT)
+ SKIP(return, "Skipping test since /dev/null does not exist");
+ }
+
+ open_fds[i] = fd;
+ }
+
+ ret = sys_close_range(1000, 1000, CLOSE_RANGE_CLOEXEC);
+ if (ret < 0) {
+ if (errno == ENOSYS)
+ SKIP(return, "close_range() syscall not supported");
+ if (errno == EINVAL)
+ SKIP(return, "close_range() doesn't support CLOSE_RANGE_CLOEXEC");
+ }
+
+ /* Ensure the FD_CLOEXEC bit is set also with a resource limit in place. */
+ ASSERT_EQ(0, getrlimit(RLIMIT_NOFILE, &rlimit));
+ rlimit.rlim_cur = 25;
+ ASSERT_EQ(0, setrlimit(RLIMIT_NOFILE, &rlimit));
+
+ /* Set close-on-exec for two ranges: [0-50] and [75-100]. */
+ ret = sys_close_range(open_fds[0], open_fds[50],
+ CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+ ASSERT_EQ(0, ret);
+ ret = sys_close_range(open_fds[75], open_fds[100],
+ CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+ ASSERT_EQ(0, ret);
+
+ for (i = 0; i <= 50; i++) {
+ int flags = fcntl(open_fds[i], F_GETFD);
+
+ EXPECT_GT(flags, -1);
+ EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+ }
+
+ for (i = 51; i <= 74; i++) {
+ int flags = fcntl(open_fds[i], F_GETFD);
+
+ EXPECT_GT(flags, -1);
+ EXPECT_EQ(flags & FD_CLOEXEC, 0);
+ }
+
+ for (i = 75; i <= 100; i++) {
+ int flags = fcntl(open_fds[i], F_GETFD);
+
+ EXPECT_GT(flags, -1);
+ EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+ }
+
+ /* Test a common pattern. */
+ ret = sys_close_range(3, UINT_MAX,
+ CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+ for (i = 0; i <= 100; i++) {
+ int flags = fcntl(open_fds[i], F_GETFD);
+
+ EXPECT_GT(flags, -1);
+ EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+ }
+}
TEST_HARNESS_MAIN
--
2.29.2
