[CRIU] [PATCH] zdtm: add a new test case for checking vma-s with the MAP_GROWSDOWN flags
Andrey Vagin
avagin at openvz.org
Fri Aug 9 06:21:24 EDT 2013
Here are two case:
* check that a vma grows after restoring
* check that a vma can be restored if its guard page was overlapped by
another vma.
Currently criu isn't able to dump/restore this test case. Who wants to
fix this issue?
Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
test/zdtm/live/static/Makefile | 1 +
test/zdtm/live/static/grow_map.c | 66 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
create mode 100644 test/zdtm/live/static/grow_map.c
diff --git a/test/zdtm/live/static/Makefile b/test/zdtm/live/static/Makefile
index 48d47c0..9c2c581 100644
--- a/test/zdtm/live/static/Makefile
+++ b/test/zdtm/live/static/Makefile
@@ -98,6 +98,7 @@ TST_NOFILE = \
sigaltstack \
sk-netlink \
mem-touch \
+ grow_map \
# jobctl00 \
TST_FILE = \
diff --git a/test/zdtm/live/static/grow_map.c b/test/zdtm/live/static/grow_map.c
new file mode 100644
index 0000000..7ce0eb8
--- /dev/null
+++ b/test/zdtm/live/static/grow_map.c
@@ -0,0 +1,66 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Check that VMA-s with MAP_GROWSDOWN are restored correctly";
+const char *test_author = "Andrew Vagin <avagin at openvz.org>";
+
+int main(int argc, char **argv)
+{
+ char *start_addr, *fake_grow_down, *test_addr, *grow_down;
+ test_init(argc, argv);
+
+ start_addr = mmap(NULL, PAGE_SIZE * 10, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ if (start_addr == MAP_FAILED) {
+ err("Can't mal a new region");
+ return 1;
+ }
+ munmap(start_addr, PAGE_SIZE * 10);
+
+ fake_grow_down = mmap(start_addr + PAGE_SIZE * 5, PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED | MAP_GROWSDOWN, -1, 0);
+ if (fake_grow_down == MAP_FAILED) {
+ err("Can't mal a new region");
+ return 1;
+ }
+
+ fake_grow_down[0] = 'c';
+ *(fake_grow_down - 1) = 'b';
+
+ /* overlap the guard page of fake_grow_down */
+ test_addr = mmap(start_addr + PAGE_SIZE * 3, PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+ if (test_addr == MAP_FAILED) {
+ err("Can't mal a new region");
+ return 1;
+ }
+
+ grow_down = mmap(start_addr + PAGE_SIZE * 2, PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED | MAP_GROWSDOWN, -1, 0);
+ if (grow_down == MAP_FAILED) {
+ err("Can't mal a new region");
+ return 1;
+ }
+
+ test_daemon();
+ test_waitsig();
+
+ munmap(test_addr, PAGE_SIZE);
+ if (fake_grow_down[0] != 'c' || *(fake_grow_down - 1) != 'b') {
+ fail("%c %c\n", fake_grow_down[0], *(fake_grow_down - 1));
+ return 1;
+ }
+
+ grow_down[0] = 'z';
+ *(grow_down - 1) = 'x';
+
+ pass();
+
+ return 0;
+}
--
1.8.3.1
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