[CRIU] [PATCH] test: check read-only bind-mounts

[Andrey Vagin]

Here is a real example how it's used.

Cc:  Tycho Andersen <tycho.andersen at canonical.com>
Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 test/zdtm.sh                           |  1 +
 test/zdtm/live/static/Makefile         |  1 +
 test/zdtm/live/static/mntns_rw_ro_rw.c | 46 ++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 test/zdtm/live/static/mntns_rw_ro_rw.c

diff --git a/test/zdtm.sh b/test/zdtm.sh
index 577e456..1d47487 100755
--- a/test/zdtm.sh
+++ b/test/zdtm.sh
@@ -321,6 +321,7 @@ mntns_link_ghost
 mntns_shared_bind
 mntns_shared_bind02
 mntns_root_bind
+mntns_rw_ro_rw
 sockets00
 cow01
 "
diff --git a/test/zdtm/live/static/Makefile b/test/zdtm/live/static/Makefile
index 418e138..32a3fa0 100644
--- a/test/zdtm/live/static/Makefile
+++ b/test/zdtm/live/static/Makefile
@@ -113,6 +113,7 @@ TST_NOFILE	=				\
 		stopped				\
 		rtc				\
 		clean_mntns			\
+		mntns_rw_ro_rw			\
 		dumpable01			\
 		dumpable02			\
 		remap_dead_pid			\
diff --git a/test/zdtm/live/static/mntns_rw_ro_rw.c b/test/zdtm/live/static/mntns_rw_ro_rw.c
new file mode 100644
index 0000000..14a134c
--- /dev/null
+++ b/test/zdtm/live/static/mntns_rw_ro_rw.c
@@ -0,0 +1,46 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Test read-only bind mounts";
+const char *test_author	= "Andrey Vagin <xemul at parallels.com>";
+
+int main(int argc, char **argv)
+{
+	test_init(argc, argv);
+
+	if (mount("/proc/sys/", "/proc/sys", NULL, MS_BIND, NULL)) {
+		err("Unable to bind-mount  /proc/sys");
+		return 1;
+	}
+	if (mount("/proc/sys/net", "/proc/sys/net", NULL, MS_BIND, NULL)) {
+		err("Unable to bind-mount /proc/sys/net");
+		return 1;
+	}
+	if (mount("/proc/sys/", "/proc/sys", NULL, MS_RDONLY|MS_BIND|MS_REMOUNT, NULL)) {
+		err("Unable to remount  /proc/sys");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (access("/proc/sys/net/unix/max_dgram_qlen", W_OK)) {
+		fail("Unable to access /proc/sys/net/core/wmem_max");
+		return 1;
+	}
+
+	if (access("/proc/sys/kernel/pid_max", W_OK) != -1 || errno != EROFS) {
+		fail("Unable to access /proc/sys/kernel/pid_max");
+		return 1;
+	}
+
+	pass();
+
+	return 0;
+}
-- 
2.1.0