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selftests: add a test for the foreign mnt ns extensions

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This tests both statmount and listmount to make sure they work with the
extensions that allow us to specify a mount ns to enter in order to find
the mount entries.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/2d1a35bc9ab94b4656c056c420f25e429e7eb0b1.1719243756.git.josef@toxicpanda.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Josef Bacik
2024-06-24 11:49:51 -04:00
committed by Christian Brauner
parent e8e43a1fcc
commit d896f71ce1
4 changed files with 424 additions and 41 deletions
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53
tools/testing/selftests/filesystems/statmount/statmount_test.c
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@@ -4,17 +4,15 @@
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <sched.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <linux/mount.h>
#include <linux/stat.h>
#include <asm/unistd.h>
#include "statmount.h"
#include "../../kselftest.h"
static const char *const known_fs[] = {
@@ -36,18 +34,6 @@ static const char *const known_fs[] = {
"ufs", "v7", "vboxsf", "vfat", "virtiofs", "vxfs", "xenfs", "xfs",
"zonefs", NULL };
static int statmount(uint64_t mnt_id, uint64_t mask, struct statmount *buf,
size_t bufsize, unsigned int flags)
{
struct mnt_id_req req = {
.size = MNT_ID_REQ_SIZE_VER0,
.mnt_id = mnt_id,
.param = mask,
};
return syscall(__NR_statmount, &req, buf, bufsize, flags);
}
static struct statmount *statmount_alloc(uint64_t mnt_id, uint64_t mask, unsigned int flags)
{
size_t bufsize = 1 << 15;
@@ -56,7 +42,7 @@ static struct statmount *statmount_alloc(uint64_t mnt_id, uint64_t mask, unsigne
int ret;
for (;;) {
ret = statmount(mnt_id, mask, tmp, bufsize, flags);
ret = statmount(mnt_id, 0, mask, tmp, bufsize, flags);
if (ret != -1)
break;
if (tofree)
@@ -122,7 +108,6 @@ static int orig_root;
static uint64_t root_id, parent_id;
static uint32_t old_root_id, old_parent_id;
static void cleanup_namespace(void)
{
fchdir(orig_root);
@@ -138,7 +123,7 @@ static void setup_namespace(void)
uid_t uid = getuid();
gid_t gid = getgid();
ret = unshare(CLONE_NEWNS|CLONE_NEWUSER);
ret = unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWPID);
if (ret == -1)
ksft_exit_fail_msg("unsharing mountns and userns: %s\n",
strerror(errno));
@@ -208,25 +193,13 @@ static int setup_mount_tree(int log2_num)
return 0;
}
static ssize_t listmount(uint64_t mnt_id, uint64_t last_mnt_id,
uint64_t list[], size_t num, unsigned int flags)
{
struct mnt_id_req req = {
.size = MNT_ID_REQ_SIZE_VER0,
.mnt_id = mnt_id,
.param = last_mnt_id,
};
return syscall(__NR_listmount, &req, list, num, flags);
}
static void test_listmount_empty_root(void)
{
ssize_t res;
const unsigned int size = 32;
uint64_t list[size];
res = listmount(LSMT_ROOT, 0, list, size, 0);
res = listmount(LSMT_ROOT, 0, 0, list, size, 0);
if (res == -1) {
ksft_test_result_fail("listmount: %s\n", strerror(errno));
return;
@@ -251,7 +224,7 @@ static void test_statmount_zero_mask(void)
struct statmount sm;
int ret;
ret = statmount(root_id, 0, &sm, sizeof(sm), 0);
ret = statmount(root_id, 0, 0, &sm, sizeof(sm), 0);
if (ret == -1) {
ksft_test_result_fail("statmount zero mask: %s\n",
strerror(errno));
@@ -277,7 +250,7 @@ static void test_statmount_mnt_basic(void)
int ret;
uint64_t mask = STATMOUNT_MNT_BASIC;
ret = statmount(root_id, mask, &sm, sizeof(sm), 0);
ret = statmount(root_id, 0, mask, &sm, sizeof(sm), 0);
if (ret == -1) {
ksft_test_result_fail("statmount mnt basic: %s\n",
strerror(errno));
@@ -337,7 +310,7 @@ static void test_statmount_sb_basic(void)
struct statx sx;
struct statfs sf;
ret = statmount(root_id, mask, &sm, sizeof(sm), 0);
ret = statmount(root_id, 0, mask, &sm, sizeof(sm), 0);
if (ret == -1) {
ksft_test_result_fail("statmount sb basic: %s\n",
strerror(errno));
@@ -498,14 +471,14 @@ static void test_statmount_string(uint64_t mask, size_t off, const char *name)
exactsize = sm->size;
shortsize = sizeof(*sm) + i;
ret = statmount(root_id, mask, sm, exactsize, 0);
ret = statmount(root_id, 0, mask, sm, exactsize, 0);
if (ret == -1) {
ksft_test_result_fail("statmount exact size: %s\n",
strerror(errno));
goto out;
}
errno = 0;
ret = statmount(root_id, mask, sm, shortsize, 0);
ret = statmount(root_id, 0, mask, sm, shortsize, 0);
if (ret != -1 || errno != EOVERFLOW) {
ksft_test_result_fail("should have failed with EOVERFLOW: %s\n",
strerror(errno));
@@ -533,7 +506,7 @@ static void test_listmount_tree(void)
if (res == -1)
return;
num = res = listmount(LSMT_ROOT, 0, list, size, 0);
num = res = listmount(LSMT_ROOT, 0, 0, list, size, 0);
if (res == -1) {
ksft_test_result_fail("listmount: %s\n", strerror(errno));
return;
@@ -545,7 +518,7 @@ static void test_listmount_tree(void)
}
for (i = 0; i < size - step;) {
res = listmount(LSMT_ROOT, i ? list2[i - 1] : 0, list2 + i, step, 0);
res = listmount(LSMT_ROOT, 0, i ? list2[i - 1] : 0, list2 + i, step, 0);
if (res == -1)
ksft_test_result_fail("short listmount: %s\n",
strerror(errno));
@@ -577,11 +550,11 @@ int main(void)
int ret;
uint64_t all_mask = STATMOUNT_SB_BASIC | STATMOUNT_MNT_BASIC |
STATMOUNT_PROPAGATE_FROM | STATMOUNT_MNT_ROOT |
STATMOUNT_MNT_POINT | STATMOUNT_FS_TYPE;
STATMOUNT_MNT_POINT | STATMOUNT_FS_TYPE | STATMOUNT_MNT_NS_ID;
ksft_print_header();
ret = statmount(0, 0, NULL, 0, 0);
ret = statmount(0, 0, 0, NULL, 0, 0);
assert(ret == -1);
if (errno == ENOSYS)
ksft_exit_skip("statmount() syscall not supported\n");