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zdtm: add a new test case for checking vma-s with the MAP_GROWSDOWN flags

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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@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2013-08-09 15:40:17 +04:00
committed by Pavel Emelyanov
parent d5540a2de5
commit eef4853cc4
2 changed files with 67 additions and 0 deletions
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1
test/zdtm/live/static/Makefile
View File

@@ -98,6 +98,7 @@ TST_NOFILE = \
sigaltstack \
sk-netlink \
mem-touch \
grow_map \
# jobctl00 \
TST_FILE = \

66
test/zdtm/live/static/grow_map.c Normal file
View File

@@ -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@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;
}