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#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <signal.h>
#include <sys/wait.h>
#include "zdtmtst.h"
const char *test_doc = "Check that a few grow-down VMA-s are restored correctly";
const char *test_author = "Andrew Vagin <avagin@openvz.org>";
int main(int argc, char **argv)
{
char *start_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) {
pr_perror("Can't mal a new region");
return 1;
}
munmap(start_addr, PAGE_SIZE * 10);
grow_down = mmap(start_addr + PAGE_SIZE * 3, PAGE_SIZE * 3, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED | MAP_GROWSDOWN, -1, 0);
if (grow_down == MAP_FAILED) {
pr_perror("Can't mal a new region");
return 1;
}
grow_down[0 * PAGE_SIZE] = 'x';
grow_down[1 * PAGE_SIZE] = 'y';
grow_down[2 * PAGE_SIZE] = 'z';
/*
* Split the grow-down vma on three parts.
* Only the irst one will have a guard page
*/
if (mprotect(grow_down + PAGE_SIZE, PAGE_SIZE, PROT_READ)) {
pr_perror("Can't change set protection on a region of memory");
return 1;
}
test_daemon();
test_waitsig();
test_msg("%c %c %c\n", grow_down[0 * PAGE_SIZE], grow_down[1 * PAGE_SIZE], grow_down[2 * PAGE_SIZE]);
if (grow_down[0 * PAGE_SIZE] != 'x')
return 1;
if (grow_down[1 * PAGE_SIZE] != 'y')
return 1;
if (grow_down[2 * PAGE_SIZE] != 'z')
return 1;
pass();
return 0;
}
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