tests: add CLOSE_RANGE_UNSHARE tests
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
diff --git a/tools/testing/selftests/core/close_range_test.c b/tools/testing/selftests/core/close_range_test.c
index 9d92f2d..c99b98b 100644
--- a/tools/testing/selftests/core/close_range_test.c
+++ b/tools/testing/selftests/core/close_range_test.c
@@ -13,11 +13,16 @@
#include <unistd.h>
#include "../kselftest_harness.h"
+#include "../clone3/clone3_selftests.h"
#ifndef __NR_close_range
#define __NR_close_range -1
#endif
+#ifndef CLOSE_RANGE_UNSHARE
+#define CLOSE_RANGE_UNSHARE (1U << 1)
+#endif
+
static inline int sys_close_range(unsigned int fd, unsigned int max_fd,
unsigned int flags)
{
@@ -87,4 +92,136 @@
EXPECT_EQ(-1, fcntl(open_fds[100], F_GETFL));
}
+TEST(close_range_unshare)
+{
+ int i, ret, status;
+ pid_t pid;
+ int open_fds[101];
+ struct clone_args args = {
+ .flags = CLONE_FILES,
+ .exit_signal = SIGCHLD,
+ };
+
+ for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+ int fd;
+
+ fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+ ASSERT_GE(fd, 0) {
+ if (errno == ENOENT)
+ XFAIL(return, "Skipping test since /dev/null does not exist");
+ }
+
+ open_fds[i] = fd;
+ }
+
+ pid = sys_clone3(&args, sizeof(args));
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ ret = sys_close_range(open_fds[0], open_fds[50],
+ CLOSE_RANGE_UNSHARE);
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ for (i = 0; i <= 50; i++)
+ if (fcntl(open_fds[i], F_GETFL) != -1)
+ exit(EXIT_FAILURE);
+
+ for (i = 51; i <= 100; i++)
+ if (fcntl(open_fds[i], F_GETFL) == -1)
+ exit(EXIT_FAILURE);
+
+ /* create a couple of gaps */
+ close(57);
+ close(78);
+ close(81);
+ close(82);
+ close(84);
+ close(90);
+
+ ret = sys_close_range(open_fds[51], open_fds[92],
+ CLOSE_RANGE_UNSHARE);
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ for (i = 51; i <= 92; i++)
+ if (fcntl(open_fds[i], F_GETFL) != -1)
+ exit(EXIT_FAILURE);
+
+ for (i = 93; i <= 100; i++)
+ if (fcntl(open_fds[i], F_GETFL) == -1)
+ exit(EXIT_FAILURE);
+
+ /* test that the kernel caps and still closes all fds */
+ ret = sys_close_range(open_fds[93], open_fds[99],
+ CLOSE_RANGE_UNSHARE);
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ for (i = 93; i <= 99; i++)
+ if (fcntl(open_fds[i], F_GETFL) != -1)
+ exit(EXIT_FAILURE);
+
+ if (fcntl(open_fds[100], F_GETFL) == -1)
+ exit(EXIT_FAILURE);
+
+ ret = sys_close_range(open_fds[100], open_fds[100],
+ CLOSE_RANGE_UNSHARE);
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ if (fcntl(open_fds[100], F_GETFL) != -1)
+ exit(EXIT_FAILURE);
+
+ exit(EXIT_SUCCESS);
+ }
+
+ EXPECT_EQ(waitpid(pid, &status, 0), pid);
+ EXPECT_EQ(true, WIFEXITED(status));
+ EXPECT_EQ(0, WEXITSTATUS(status));
+}
+
+TEST(close_range_unshare_capped)
+{
+ int i, ret, status;
+ pid_t pid;
+ int open_fds[101];
+ struct clone_args args = {
+ .flags = CLONE_FILES,
+ .exit_signal = SIGCHLD,
+ };
+
+ for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+ int fd;
+
+ fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+ ASSERT_GE(fd, 0) {
+ if (errno == ENOENT)
+ XFAIL(return, "Skipping test since /dev/null does not exist");
+ }
+
+ open_fds[i] = fd;
+ }
+
+ pid = sys_clone3(&args, sizeof(args));
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ ret = sys_close_range(open_fds[0], UINT_MAX,
+ CLOSE_RANGE_UNSHARE);
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ for (i = 0; i <= 100; i++)
+ if (fcntl(open_fds[i], F_GETFL) != -1)
+ exit(EXIT_FAILURE);
+
+ exit(EXIT_SUCCESS);
+ }
+
+ EXPECT_EQ(waitpid(pid, &status, 0), pid);
+ EXPECT_EQ(true, WIFEXITED(status));
+ EXPECT_EQ(0, WEXITSTATUS(status));
+}
+
TEST_HARNESS_MAIN
