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selftests/landlock: Add tests for FS topology changes with network rules

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Add 2 tests to the layout1 fixture:
* topology_changes_with_net_only: Checks that FS topology
  changes are not denied by network-only restrictions.
* topology_changes_with_net_and_fs: Make sure that FS topology
  changes are still denied with FS and network restrictions.

This specifically test commit d722036403 ("landlock: Allow FS topology
changes for domains without such rule type").

Cc: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
Link: https://lore.kernel.org/r/20231027154615.815134-1-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Mickaël Salaün 2023-10-27 17:46:15 +02:00
parent 51442e8d64
commit f12f8f8450
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1 changed files with 59 additions and 0 deletions
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59
tools/testing/selftests/landlock/fs_test.c
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@ -1625,6 +1625,65 @@ TEST_F_FORK(layout1, move_mount)
clear_cap(_metadata, CAP_SYS_ADMIN);
}
TEST_F_FORK(layout1, topology_changes_with_net_only)
{
const struct landlock_ruleset_attr ruleset_net = {
.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
LANDLOCK_ACCESS_NET_CONNECT_TCP,
};
int ruleset_fd;
/* Add network restrictions. */
ruleset_fd =
landlock_create_ruleset(&ruleset_net, sizeof(ruleset_net), 0);
ASSERT_LE(0, ruleset_fd);
enforce_ruleset(_metadata, ruleset_fd);
ASSERT_EQ(0, close(ruleset_fd));
/* Mount, remount, move_mount, umount, and pivot_root checks. */
set_cap(_metadata, CAP_SYS_ADMIN);
ASSERT_EQ(0, mount_opt(&mnt_tmp, dir_s1d2));
ASSERT_EQ(0, mount(NULL, dir_s1d2, NULL, MS_PRIVATE | MS_REC, NULL));
ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s1d2, AT_FDCWD,
dir_s2d2, 0));
ASSERT_EQ(0, umount(dir_s2d2));
ASSERT_EQ(0, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3));
ASSERT_EQ(0, chdir("/"));
clear_cap(_metadata, CAP_SYS_ADMIN);
}
TEST_F_FORK(layout1, topology_changes_with_net_and_fs)
{
const struct landlock_ruleset_attr ruleset_net_fs = {
.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
LANDLOCK_ACCESS_NET_CONNECT_TCP,
.handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE,
};
int ruleset_fd;
/* Add network and filesystem restrictions. */
ruleset_fd = landlock_create_ruleset(&ruleset_net_fs,
sizeof(ruleset_net_fs), 0);
ASSERT_LE(0, ruleset_fd);
enforce_ruleset(_metadata, ruleset_fd);
ASSERT_EQ(0, close(ruleset_fd));
/* Mount, remount, move_mount, umount, and pivot_root checks. */
set_cap(_metadata, CAP_SYS_ADMIN);
ASSERT_EQ(-1, mount_opt(&mnt_tmp, dir_s1d2));
ASSERT_EQ(EPERM, errno);
ASSERT_EQ(-1, mount(NULL, dir_s3d2, NULL, MS_PRIVATE | MS_REC, NULL));
ASSERT_EQ(EPERM, errno);
ASSERT_EQ(-1, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD,
dir_s2d2, 0));
ASSERT_EQ(EPERM, errno);
ASSERT_EQ(-1, umount(dir_s3d2));
ASSERT_EQ(EPERM, errno);
ASSERT_EQ(-1, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3));
ASSERT_EQ(EPERM, errno);
clear_cap(_metadata, CAP_SYS_ADMIN);
}
TEST_F_FORK(layout1, release_inodes)
{
const struct rule rules[] = {