[CRIU] [PATCH v4 02/31] zdtm: Add userns01 test

[Kirill Tkhai]

FIXME: use custom UID and GID, not 0 and 0.
Now we are using 0 and 0 to allow the test running
in any environment, and do not carry about CT mappings.

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 test/zdtm/static/Makefile      |    1 
 test/zdtm/static/userns01.c    |  150 ++++++++++++++++++++++++++++++++++++++++
 test/zdtm/static/userns01.desc |    1 
 3 files changed, 152 insertions(+)
 create mode 100644 test/zdtm/static/userns01.c
 create mode 100644 test/zdtm/static/userns01.desc

diff --git a/test/zdtm/static/Makefile b/test/zdtm/static/Makefile
index f7c46da8c..b4d813420 100644
--- a/test/zdtm/static/Makefile
+++ b/test/zdtm/static/Makefile
@@ -176,6 +176,7 @@ TST_NOFILE	:=				\
 		uffd-events			\
 		netns_sub			\
 		userns00			\
+		userns01			\
 #		jobctl00			\
 
 ifneq ($(SRCARCH),arm)
diff --git a/test/zdtm/static/userns01.c b/test/zdtm/static/userns01.c
new file mode 100644
index 000000000..b4d8534f0
--- /dev/null
+++ b/test/zdtm/static/userns01.c
@@ -0,0 +1,150 @@
+#define _GNU_SOURCE
+#include <stdbool.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <dirent.h>
+
+#include "zdtmtst.h"
+#include "lock.h"
+
+const char *test_doc	= "Check UID and GID in unshared userns remains the same";
+const char *test_author	= "Kirill Tkhai <ktkhai at virtuozzo.com>";
+
+enum {
+	FUTEX_INITIALIZED = 0,
+	CHILD_CREATED,
+	MAP_WRITTEN,
+	XIDS_SET,
+	POST_RESTORE_CHECK,
+	EMERGENCY_ABORT,
+};
+
+#define CHILD_UID 0
+#define CHILD_GID 0
+#define UID_MAP "0 0 1\n"
+#define GID_MAP "0 0 1\n"
+
+futex_t *futex;
+
+int write_map(pid_t pid, char *file, char *map)
+{
+	char path[PATH_MAX];
+	int fd, ret;
+
+	sprintf(path, "/proc/%d/%s", pid, file);
+	fd = open(path, O_WRONLY);
+	if (fd < 0) {
+		fail("Can't open");
+		return -1;
+	}
+	ret = write(fd, map, strlen(map));
+	if (ret != strlen(map)) {
+		fail("Can't write");
+		close(fd);
+		return -1;
+	}
+	close(fd);
+
+	return 0;
+}
+
+int child(void)
+{
+	uid_t uid;
+	gid_t gid;
+	int ret;
+
+	ret = unshare(CLONE_NEWUSER);
+	if (ret < 0) {
+		pr_perror("unshare");
+		futex_set_and_wake(futex, EMERGENCY_ABORT);
+		return 1;
+	}
+
+	futex_set_and_wake(futex, CHILD_CREATED);
+	futex_wait_while_lt(futex, MAP_WRITTEN);
+
+	if (setuid(CHILD_UID) < 0) {
+		pr_perror("setuid");
+		futex_set_and_wake(futex, EMERGENCY_ABORT);
+		return 2;
+	}
+
+	if (setgid(CHILD_GID) < 0) {
+		pr_perror("setgid");
+		futex_set_and_wake(futex, EMERGENCY_ABORT);
+		return 3;
+	}
+
+	futex_set_and_wake(futex, XIDS_SET);
+	futex_wait_while_lt(futex, POST_RESTORE_CHECK);
+
+	uid = getuid();
+	gid = getgid();
+	if (uid != CHILD_UID || gid != CHILD_GID) {
+		pr_perror("UID or GID is wrong: %d %d", uid, gid);
+		futex_set_and_wake(futex, EMERGENCY_ABORT);
+		return 4;
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	int status;
+	pid_t pid;
+
+	test_init(argc, argv);
+	futex = mmap(NULL, sizeof(*futex), PROT_WRITE | PROT_READ, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+	if (futex == MAP_FAILED) {
+		fail("mmap futex\n");
+		return 1;
+	}
+	futex_init(futex);
+
+	pid = fork();
+	if (pid == -1) {
+		fail("fork");
+		return 1;
+	} else if (pid == 0)
+		exit(child());
+
+	futex_wait_while_lt(futex, CHILD_CREATED);
+
+	if (write_map(pid, "uid_map", UID_MAP) < 0 ||
+	    write_map(pid, "gid_map", GID_MAP) < 0) {
+		fail("write map");
+		goto err;
+	}
+
+	futex_set_and_wake(futex, MAP_WRITTEN);
+	futex_wait_while_lt(futex, XIDS_SET);
+
+	test_daemon();
+	test_waitsig();
+
+	futex_set_and_wake(futex, POST_RESTORE_CHECK);
+
+	if (wait(&status) < 0 || WEXITSTATUS(status)) {
+		fail("pid: status=%d\n", WEXITSTATUS(status));
+		goto err;
+	}
+
+	pass();
+	return 0;
+err:
+	futex_set_and_wake(futex, EMERGENCY_ABORT);
+	wait(&status);
+	return 1;
+}
diff --git a/test/zdtm/static/userns01.desc b/test/zdtm/static/userns01.desc
new file mode 100644
index 000000000..1f8bec515
--- /dev/null
+++ b/test/zdtm/static/userns01.desc
@@ -0,0 +1 @@
+{'flavor': 'uns', 'flags': 'suid noauto'}