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zdtm: add a test for unsupported children collision

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These test is not automatic as after kernel v4.11 behaviour changes, on
older kernel we get children collision:

817 188 0:48 / /zdtm/static/unsupported_children_collision.test/share1 rw,relatime shared:942 - tmpfs share rw
> 818 817 0:124 / /zdtm/static/unsupported_children_collision.test/share1/child rw,relatime shared:943 - tmpfs child1 rw
819 188 0:48 / /zdtm/static/unsupported_children_collision.test/share2 rw,relatime shared:942 - tmpfs share rw
820 819 0:125 / /zdtm/static/unsupported_children_collision.test/share2/child rw,relatime shared:944 - tmpfs child2 rw
> 821 817 0:125 / /zdtm/static/unsupported_children_collision.test/share1/child rw,relatime shared:944 - tmpfs child2 rw

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Pavel Tikhomirov 2018-07-10 19:02:24 +03:00 committed by Andrei Vagin
parent f167a1dd34
commit fc01e18b47
3 changed files with 112 additions and 0 deletions
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1
test/zdtm/static/Makefile
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@ -336,6 +336,7 @@ TST_DIR = \
del_standalone_un \
sk-unix-mntns \
sk-unix01 \
unsupported_children_collision \
TST_DIR_FILE = \
chroot \

110
test/zdtm/static/unsupported_children_collision.c Normal file
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@ -0,0 +1,110 @@
#include <sys/mount.h>
#include <sys/stat.h>
#include <limits.h>
#include "zdtmtst.h"
const char *test_doc = "Check unsupported children collision for mounts";
const char *test_author = "Pavel Tikhomirov <ptikhomirov@virtuozzo.com>";
char *dirname;
TEST_OPTION(dirname, string, "directory name", 1);
int main(int argc, char **argv)
{
char share1[PATH_MAX], share2[PATH_MAX];
char child1[PATH_MAX], child2[PATH_MAX];
test_init(argc, argv);
if (mkdir(dirname, 0700)) {
pr_perror("mkdir");
return 1;
}
if (mount("zdtm_fs", dirname, "tmpfs", 0, NULL)) {
pr_perror("mount");
return 1;
}
if (mount(NULL, dirname, NULL, MS_PRIVATE, NULL)) {
pr_perror("mount");
return 1;
}
snprintf(share1, sizeof(share1), "%s/share1", dirname);
if (mkdir(share1, 0700)) {
pr_perror("mkdir");
return 1;
}
if (mount("share", share1, "tmpfs", 0, NULL)) {
pr_perror("mount");
return 1;
}
if (mount(NULL, share1, NULL, MS_SHARED, NULL)) {
pr_perror("mount");
return 1;
}
snprintf(child1, sizeof(child1), "%s/share1/child", dirname);
if (mkdir(child1, 0700)) {
pr_perror("mkdir");
return 1;
}
if (mount("child1", child1, "tmpfs", 0, NULL)) {
pr_perror("mount");
return 1;
}
snprintf(share2, sizeof(share2), "%s/share2", dirname);
if (mkdir(share2, 0700)) {
pr_perror("mkdir");
return 1;
}
if (mount(share1, share2, NULL, MS_BIND, NULL)) {
pr_perror("mount");
return 1;
}
snprintf(child2, sizeof(child2), "%s/share2/child", dirname);
if (mount("child2", child2, "tmpfs", 0, NULL)) {
pr_perror("mount");
return 1;
}
test_daemon();
test_waitsig();
if (umount(child2)) {
pr_perror("Unable to umount %s", share1);
return 1;
}
if (umount(share2)) {
pr_perror("Unable to umount %s", share2);
return 1;
}
if (umount(child1)) {
pr_perror("Unable to umount %s", child1);
return 1;
}
if (umount(share1)) {
pr_perror("Unable to umount %s", share1);
return 1;
}
if (umount(dirname)) {
pr_perror("Unable to umount %s", dirname);
return 1;
}
pass();
return 0;
}

1
test/zdtm/static/unsupported_children_collision.desc Normal file
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@ -0,0 +1 @@
{'flavor': 'ns uns', 'flags': 'suid noauto crfail'}