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d671fa6393
It is necessary to set fd to -1 when inotify_add_watch() fails in
cg_prepare_for_wait. Otherwise the fd which has been closed in
cg_prepare_for_wait may be misused in other functions such as
cg_enter_and_wait_for_frozen and cg_freeze_wait.
Fixes: 5313bfe425 ("selftests: cgroup: add freezer controller self-tests")
Signed-off-by: Hewenliang <hewenliang4@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
906 lines
16 KiB
C
906 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdbool.h>
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#include <linux/limits.h>
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#include <sys/ptrace.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <sys/inotify.h>
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#include <string.h>
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#include <sys/wait.h>
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#include "../kselftest.h"
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#include "cgroup_util.h"
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#define DEBUG
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#ifdef DEBUG
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#define debug(args...) fprintf(stderr, args)
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#else
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#define debug(args...)
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#endif
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/*
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* Check if the cgroup is frozen by looking at the cgroup.events::frozen value.
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*/
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static int cg_check_frozen(const char *cgroup, bool frozen)
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{
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if (frozen) {
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if (cg_read_strstr(cgroup, "cgroup.events", "frozen 1") != 0) {
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debug("Cgroup %s isn't frozen\n", cgroup);
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return -1;
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}
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} else {
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/*
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* Check the cgroup.events::frozen value.
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*/
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if (cg_read_strstr(cgroup, "cgroup.events", "frozen 0") != 0) {
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debug("Cgroup %s is frozen\n", cgroup);
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return -1;
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}
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}
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return 0;
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}
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/*
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* Freeze the given cgroup.
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*/
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static int cg_freeze_nowait(const char *cgroup, bool freeze)
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{
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return cg_write(cgroup, "cgroup.freeze", freeze ? "1" : "0");
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}
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/*
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* Prepare for waiting on cgroup.events file.
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*/
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static int cg_prepare_for_wait(const char *cgroup)
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{
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int fd, ret = -1;
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fd = inotify_init1(0);
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if (fd == -1) {
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debug("Error: inotify_init1() failed\n");
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return fd;
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}
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ret = inotify_add_watch(fd, cg_control(cgroup, "cgroup.events"),
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IN_MODIFY);
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if (ret == -1) {
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debug("Error: inotify_add_watch() failed\n");
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close(fd);
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fd = -1;
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}
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return fd;
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}
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/*
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* Wait for an event. If there are no events for 10 seconds,
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* treat this an error.
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*/
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static int cg_wait_for(int fd)
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{
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int ret = -1;
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struct pollfd fds = {
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.fd = fd,
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.events = POLLIN,
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};
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while (true) {
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ret = poll(&fds, 1, 10000);
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if (ret == -1) {
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if (errno == EINTR)
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continue;
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debug("Error: poll() failed\n");
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break;
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}
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if (ret > 0 && fds.revents & POLLIN) {
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ret = 0;
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break;
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}
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}
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return ret;
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}
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/*
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* Attach a task to the given cgroup and wait for a cgroup frozen event.
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* All transient events (e.g. populated) are ignored.
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*/
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static int cg_enter_and_wait_for_frozen(const char *cgroup, int pid,
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bool frozen)
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{
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int fd, ret = -1;
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int attempts;
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fd = cg_prepare_for_wait(cgroup);
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if (fd < 0)
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return fd;
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ret = cg_enter(cgroup, pid);
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if (ret)
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goto out;
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for (attempts = 0; attempts < 10; attempts++) {
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ret = cg_wait_for(fd);
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if (ret)
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break;
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ret = cg_check_frozen(cgroup, frozen);
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if (ret)
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continue;
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}
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out:
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close(fd);
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return ret;
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}
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/*
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* Freeze the given cgroup and wait for the inotify signal.
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* If there are no events in 10 seconds, treat this as an error.
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* Then check that the cgroup is in the desired state.
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*/
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static int cg_freeze_wait(const char *cgroup, bool freeze)
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{
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int fd, ret = -1;
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fd = cg_prepare_for_wait(cgroup);
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if (fd < 0)
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return fd;
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ret = cg_freeze_nowait(cgroup, freeze);
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if (ret) {
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debug("Error: cg_freeze_nowait() failed\n");
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goto out;
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}
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ret = cg_wait_for(fd);
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if (ret)
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goto out;
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ret = cg_check_frozen(cgroup, freeze);
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out:
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close(fd);
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return ret;
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}
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/*
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* A simple process running in a sleep loop until being
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* re-parented.
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*/
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static int child_fn(const char *cgroup, void *arg)
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{
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int ppid = getppid();
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while (getppid() == ppid)
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usleep(1000);
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return getppid() == ppid;
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}
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/*
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* A simple test for the cgroup freezer: populated the cgroup with 100
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* running processes and freeze it. Then unfreeze it. Then it kills all
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* processes and destroys the cgroup.
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*/
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static int test_cgfreezer_simple(const char *root)
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{
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int ret = KSFT_FAIL;
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char *cgroup = NULL;
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int i;
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cgroup = cg_name(root, "cg_test_simple");
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if (!cgroup)
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goto cleanup;
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if (cg_create(cgroup))
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goto cleanup;
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for (i = 0; i < 100; i++)
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cg_run_nowait(cgroup, child_fn, NULL);
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if (cg_wait_for_proc_count(cgroup, 100))
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goto cleanup;
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if (cg_check_frozen(cgroup, false))
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goto cleanup;
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if (cg_freeze_wait(cgroup, true))
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goto cleanup;
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if (cg_freeze_wait(cgroup, false))
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goto cleanup;
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ret = KSFT_PASS;
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cleanup:
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if (cgroup)
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cg_destroy(cgroup);
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free(cgroup);
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return ret;
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}
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/*
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* The test creates the following hierarchy:
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* A
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* / / \ \
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* B E I K
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* /\ |
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* C D F
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* |
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* G
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* |
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* H
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*
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* with a process in C, H and 3 processes in K.
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* Then it tries to freeze and unfreeze the whole tree.
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*/
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static int test_cgfreezer_tree(const char *root)
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{
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char *cgroup[10] = {0};
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int ret = KSFT_FAIL;
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int i;
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cgroup[0] = cg_name(root, "cg_test_tree_A");
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if (!cgroup[0])
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goto cleanup;
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cgroup[1] = cg_name(cgroup[0], "B");
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if (!cgroup[1])
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goto cleanup;
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cgroup[2] = cg_name(cgroup[1], "C");
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if (!cgroup[2])
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goto cleanup;
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cgroup[3] = cg_name(cgroup[1], "D");
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if (!cgroup[3])
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goto cleanup;
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cgroup[4] = cg_name(cgroup[0], "E");
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if (!cgroup[4])
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goto cleanup;
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cgroup[5] = cg_name(cgroup[4], "F");
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if (!cgroup[5])
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goto cleanup;
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cgroup[6] = cg_name(cgroup[5], "G");
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if (!cgroup[6])
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goto cleanup;
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cgroup[7] = cg_name(cgroup[6], "H");
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if (!cgroup[7])
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goto cleanup;
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cgroup[8] = cg_name(cgroup[0], "I");
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if (!cgroup[8])
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goto cleanup;
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cgroup[9] = cg_name(cgroup[0], "K");
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if (!cgroup[9])
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goto cleanup;
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for (i = 0; i < 10; i++)
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if (cg_create(cgroup[i]))
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goto cleanup;
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cg_run_nowait(cgroup[2], child_fn, NULL);
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cg_run_nowait(cgroup[7], child_fn, NULL);
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cg_run_nowait(cgroup[9], child_fn, NULL);
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cg_run_nowait(cgroup[9], child_fn, NULL);
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cg_run_nowait(cgroup[9], child_fn, NULL);
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/*
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* Wait until all child processes will enter
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* corresponding cgroups.
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*/
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if (cg_wait_for_proc_count(cgroup[2], 1) ||
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cg_wait_for_proc_count(cgroup[7], 1) ||
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cg_wait_for_proc_count(cgroup[9], 3))
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goto cleanup;
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/*
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* Freeze B.
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*/
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if (cg_freeze_wait(cgroup[1], true))
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goto cleanup;
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/*
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* Freeze F.
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*/
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if (cg_freeze_wait(cgroup[5], true))
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goto cleanup;
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/*
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* Freeze G.
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*/
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if (cg_freeze_wait(cgroup[6], true))
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goto cleanup;
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/*
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* Check that A and E are not frozen.
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*/
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if (cg_check_frozen(cgroup[0], false))
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goto cleanup;
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if (cg_check_frozen(cgroup[4], false))
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goto cleanup;
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/*
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* Freeze A. Check that A, B and E are frozen.
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*/
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if (cg_freeze_wait(cgroup[0], true))
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goto cleanup;
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if (cg_check_frozen(cgroup[1], true))
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goto cleanup;
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if (cg_check_frozen(cgroup[4], true))
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goto cleanup;
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/*
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* Unfreeze B, F and G
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*/
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if (cg_freeze_nowait(cgroup[1], false))
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goto cleanup;
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if (cg_freeze_nowait(cgroup[5], false))
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goto cleanup;
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if (cg_freeze_nowait(cgroup[6], false))
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goto cleanup;
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/*
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* Check that C and H are still frozen.
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*/
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if (cg_check_frozen(cgroup[2], true))
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goto cleanup;
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if (cg_check_frozen(cgroup[7], true))
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goto cleanup;
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/*
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* Unfreeze A. Check that A, C and K are not frozen.
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*/
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if (cg_freeze_wait(cgroup[0], false))
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goto cleanup;
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if (cg_check_frozen(cgroup[2], false))
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goto cleanup;
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if (cg_check_frozen(cgroup[9], false))
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goto cleanup;
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ret = KSFT_PASS;
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cleanup:
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for (i = 9; i >= 0 && cgroup[i]; i--) {
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cg_destroy(cgroup[i]);
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free(cgroup[i]);
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}
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return ret;
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}
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/*
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* A fork bomb emulator.
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*/
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static int forkbomb_fn(const char *cgroup, void *arg)
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{
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int ppid;
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fork();
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fork();
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ppid = getppid();
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while (getppid() == ppid)
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usleep(1000);
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return getppid() == ppid;
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}
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/*
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* The test runs a fork bomb in a cgroup and tries to freeze it.
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* Then it kills all processes and checks that cgroup isn't populated
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* anymore.
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*/
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static int test_cgfreezer_forkbomb(const char *root)
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{
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int ret = KSFT_FAIL;
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char *cgroup = NULL;
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cgroup = cg_name(root, "cg_forkbomb_test");
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if (!cgroup)
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goto cleanup;
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if (cg_create(cgroup))
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goto cleanup;
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cg_run_nowait(cgroup, forkbomb_fn, NULL);
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usleep(100000);
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if (cg_freeze_wait(cgroup, true))
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goto cleanup;
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if (cg_killall(cgroup))
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goto cleanup;
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if (cg_wait_for_proc_count(cgroup, 0))
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goto cleanup;
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ret = KSFT_PASS;
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cleanup:
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if (cgroup)
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cg_destroy(cgroup);
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free(cgroup);
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return ret;
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}
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/*
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* The test creates a cgroups and freezes it. Then it creates a child cgroup
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* and populates it with a task. After that it checks that the child cgroup
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* is frozen and the parent cgroup remains frozen too.
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*/
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static int test_cgfreezer_mkdir(const char *root)
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{
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int ret = KSFT_FAIL;
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char *parent, *child = NULL;
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int pid;
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parent = cg_name(root, "cg_test_mkdir_A");
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if (!parent)
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goto cleanup;
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child = cg_name(parent, "cg_test_mkdir_B");
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if (!child)
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goto cleanup;
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if (cg_create(parent))
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goto cleanup;
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if (cg_freeze_wait(parent, true))
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goto cleanup;
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if (cg_create(child))
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goto cleanup;
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pid = cg_run_nowait(child, child_fn, NULL);
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if (pid < 0)
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goto cleanup;
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if (cg_wait_for_proc_count(child, 1))
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goto cleanup;
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if (cg_check_frozen(child, true))
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goto cleanup;
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if (cg_check_frozen(parent, true))
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goto cleanup;
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ret = KSFT_PASS;
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cleanup:
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if (child)
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cg_destroy(child);
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free(child);
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if (parent)
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cg_destroy(parent);
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free(parent);
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return ret;
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}
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/*
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* The test creates two nested cgroups, freezes the parent
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* and removes the child. Then it checks that the parent cgroup
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* remains frozen and it's possible to create a new child
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* without unfreezing. The new child is frozen too.
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*/
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static int test_cgfreezer_rmdir(const char *root)
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{
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int ret = KSFT_FAIL;
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char *parent, *child = NULL;
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parent = cg_name(root, "cg_test_rmdir_A");
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if (!parent)
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goto cleanup;
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child = cg_name(parent, "cg_test_rmdir_B");
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if (!child)
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goto cleanup;
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if (cg_create(parent))
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goto cleanup;
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if (cg_create(child))
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goto cleanup;
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if (cg_freeze_wait(parent, true))
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goto cleanup;
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if (cg_destroy(child))
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goto cleanup;
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if (cg_check_frozen(parent, true))
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goto cleanup;
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if (cg_create(child))
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goto cleanup;
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if (cg_check_frozen(child, true))
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goto cleanup;
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ret = KSFT_PASS;
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cleanup:
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if (child)
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cg_destroy(child);
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free(child);
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if (parent)
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cg_destroy(parent);
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free(parent);
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return ret;
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}
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/*
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* The test creates two cgroups: A and B, runs a process in A
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* and performs several migrations:
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* 1) A (running) -> B (frozen)
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* 2) B (frozen) -> A (running)
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* 3) A (frozen) -> B (frozen)
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*
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* On each step it checks the actual state of both cgroups.
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*/
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static int test_cgfreezer_migrate(const char *root)
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{
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int ret = KSFT_FAIL;
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char *cgroup[2] = {0};
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int pid;
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cgroup[0] = cg_name(root, "cg_test_migrate_A");
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if (!cgroup[0])
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goto cleanup;
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cgroup[1] = cg_name(root, "cg_test_migrate_B");
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if (!cgroup[1])
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goto cleanup;
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if (cg_create(cgroup[0]))
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goto cleanup;
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if (cg_create(cgroup[1]))
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goto cleanup;
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pid = cg_run_nowait(cgroup[0], child_fn, NULL);
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if (pid < 0)
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goto cleanup;
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|
|
if (cg_wait_for_proc_count(cgroup[0], 1))
|
|
goto cleanup;
|
|
|
|
/*
|
|
* Migrate from A (running) to B (frozen)
|
|
*/
|
|
if (cg_freeze_wait(cgroup[1], true))
|
|
goto cleanup;
|
|
|
|
if (cg_enter_and_wait_for_frozen(cgroup[1], pid, true))
|
|
goto cleanup;
|
|
|
|
if (cg_check_frozen(cgroup[0], false))
|
|
goto cleanup;
|
|
|
|
/*
|
|
* Migrate from B (frozen) to A (running)
|
|
*/
|
|
if (cg_enter_and_wait_for_frozen(cgroup[0], pid, false))
|
|
goto cleanup;
|
|
|
|
if (cg_check_frozen(cgroup[1], true))
|
|
goto cleanup;
|
|
|
|
/*
|
|
* Migrate from A (frozen) to B (frozen)
|
|
*/
|
|
if (cg_freeze_wait(cgroup[0], true))
|
|
goto cleanup;
|
|
|
|
if (cg_enter_and_wait_for_frozen(cgroup[1], pid, true))
|
|
goto cleanup;
|
|
|
|
if (cg_check_frozen(cgroup[0], true))
|
|
goto cleanup;
|
|
|
|
ret = KSFT_PASS;
|
|
|
|
cleanup:
|
|
if (cgroup[0])
|
|
cg_destroy(cgroup[0]);
|
|
free(cgroup[0]);
|
|
if (cgroup[1])
|
|
cg_destroy(cgroup[1]);
|
|
free(cgroup[1]);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* The test checks that ptrace works with a tracing process in a frozen cgroup.
|
|
*/
|
|
static int test_cgfreezer_ptrace(const char *root)
|
|
{
|
|
int ret = KSFT_FAIL;
|
|
char *cgroup = NULL;
|
|
siginfo_t siginfo;
|
|
int pid;
|
|
|
|
cgroup = cg_name(root, "cg_test_ptrace");
|
|
if (!cgroup)
|
|
goto cleanup;
|
|
|
|
if (cg_create(cgroup))
|
|
goto cleanup;
|
|
|
|
pid = cg_run_nowait(cgroup, child_fn, NULL);
|
|
if (pid < 0)
|
|
goto cleanup;
|
|
|
|
if (cg_wait_for_proc_count(cgroup, 1))
|
|
goto cleanup;
|
|
|
|
if (cg_freeze_wait(cgroup, true))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_SEIZE, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_INTERRUPT, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
waitpid(pid, NULL, 0);
|
|
|
|
/*
|
|
* Cgroup has to remain frozen, however the test task
|
|
* is in traced state.
|
|
*/
|
|
if (cg_check_frozen(cgroup, true))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &siginfo))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_DETACH, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
if (cg_check_frozen(cgroup, true))
|
|
goto cleanup;
|
|
|
|
ret = KSFT_PASS;
|
|
|
|
cleanup:
|
|
if (cgroup)
|
|
cg_destroy(cgroup);
|
|
free(cgroup);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check if the process is stopped.
|
|
*/
|
|
static int proc_check_stopped(int pid)
|
|
{
|
|
char buf[PAGE_SIZE];
|
|
int len;
|
|
|
|
len = proc_read_text(pid, 0, "stat", buf, sizeof(buf));
|
|
if (len == -1) {
|
|
debug("Can't get %d stat\n", pid);
|
|
return -1;
|
|
}
|
|
|
|
if (strstr(buf, "(test_freezer) T ") == NULL) {
|
|
debug("Process %d in the unexpected state: %s\n", pid, buf);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Test that it's possible to freeze a cgroup with a stopped process.
|
|
*/
|
|
static int test_cgfreezer_stopped(const char *root)
|
|
{
|
|
int pid, ret = KSFT_FAIL;
|
|
char *cgroup = NULL;
|
|
|
|
cgroup = cg_name(root, "cg_test_stopped");
|
|
if (!cgroup)
|
|
goto cleanup;
|
|
|
|
if (cg_create(cgroup))
|
|
goto cleanup;
|
|
|
|
pid = cg_run_nowait(cgroup, child_fn, NULL);
|
|
|
|
if (cg_wait_for_proc_count(cgroup, 1))
|
|
goto cleanup;
|
|
|
|
if (kill(pid, SIGSTOP))
|
|
goto cleanup;
|
|
|
|
if (cg_check_frozen(cgroup, false))
|
|
goto cleanup;
|
|
|
|
if (cg_freeze_wait(cgroup, true))
|
|
goto cleanup;
|
|
|
|
if (cg_freeze_wait(cgroup, false))
|
|
goto cleanup;
|
|
|
|
if (proc_check_stopped(pid))
|
|
goto cleanup;
|
|
|
|
ret = KSFT_PASS;
|
|
|
|
cleanup:
|
|
if (cgroup)
|
|
cg_destroy(cgroup);
|
|
free(cgroup);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Test that it's possible to freeze a cgroup with a ptraced process.
|
|
*/
|
|
static int test_cgfreezer_ptraced(const char *root)
|
|
{
|
|
int pid, ret = KSFT_FAIL;
|
|
char *cgroup = NULL;
|
|
siginfo_t siginfo;
|
|
|
|
cgroup = cg_name(root, "cg_test_ptraced");
|
|
if (!cgroup)
|
|
goto cleanup;
|
|
|
|
if (cg_create(cgroup))
|
|
goto cleanup;
|
|
|
|
pid = cg_run_nowait(cgroup, child_fn, NULL);
|
|
|
|
if (cg_wait_for_proc_count(cgroup, 1))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_SEIZE, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_INTERRUPT, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
waitpid(pid, NULL, 0);
|
|
|
|
if (cg_check_frozen(cgroup, false))
|
|
goto cleanup;
|
|
|
|
if (cg_freeze_wait(cgroup, true))
|
|
goto cleanup;
|
|
|
|
/*
|
|
* cg_check_frozen(cgroup, true) will fail here,
|
|
* because the task in in the TRACEd state.
|
|
*/
|
|
if (cg_freeze_wait(cgroup, false))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &siginfo))
|
|
goto cleanup;
|
|
|
|
if (ptrace(PTRACE_DETACH, pid, NULL, NULL))
|
|
goto cleanup;
|
|
|
|
ret = KSFT_PASS;
|
|
|
|
cleanup:
|
|
if (cgroup)
|
|
cg_destroy(cgroup);
|
|
free(cgroup);
|
|
return ret;
|
|
}
|
|
|
|
static int vfork_fn(const char *cgroup, void *arg)
|
|
{
|
|
int pid = vfork();
|
|
|
|
if (pid == 0)
|
|
while (true)
|
|
sleep(1);
|
|
|
|
return pid;
|
|
}
|
|
|
|
/*
|
|
* Test that it's possible to freeze a cgroup with a process,
|
|
* which called vfork() and is waiting for a child.
|
|
*/
|
|
static int test_cgfreezer_vfork(const char *root)
|
|
{
|
|
int ret = KSFT_FAIL;
|
|
char *cgroup = NULL;
|
|
|
|
cgroup = cg_name(root, "cg_test_vfork");
|
|
if (!cgroup)
|
|
goto cleanup;
|
|
|
|
if (cg_create(cgroup))
|
|
goto cleanup;
|
|
|
|
cg_run_nowait(cgroup, vfork_fn, NULL);
|
|
|
|
if (cg_wait_for_proc_count(cgroup, 2))
|
|
goto cleanup;
|
|
|
|
if (cg_freeze_wait(cgroup, true))
|
|
goto cleanup;
|
|
|
|
ret = KSFT_PASS;
|
|
|
|
cleanup:
|
|
if (cgroup)
|
|
cg_destroy(cgroup);
|
|
free(cgroup);
|
|
return ret;
|
|
}
|
|
|
|
#define T(x) { x, #x }
|
|
struct cgfreezer_test {
|
|
int (*fn)(const char *root);
|
|
const char *name;
|
|
} tests[] = {
|
|
T(test_cgfreezer_simple),
|
|
T(test_cgfreezer_tree),
|
|
T(test_cgfreezer_forkbomb),
|
|
T(test_cgfreezer_mkdir),
|
|
T(test_cgfreezer_rmdir),
|
|
T(test_cgfreezer_migrate),
|
|
T(test_cgfreezer_ptrace),
|
|
T(test_cgfreezer_stopped),
|
|
T(test_cgfreezer_ptraced),
|
|
T(test_cgfreezer_vfork),
|
|
};
|
|
#undef T
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
char root[PATH_MAX];
|
|
int i, ret = EXIT_SUCCESS;
|
|
|
|
if (cg_find_unified_root(root, sizeof(root)))
|
|
ksft_exit_skip("cgroup v2 isn't mounted\n");
|
|
for (i = 0; i < ARRAY_SIZE(tests); i++) {
|
|
switch (tests[i].fn(root)) {
|
|
case KSFT_PASS:
|
|
ksft_test_result_pass("%s\n", tests[i].name);
|
|
break;
|
|
case KSFT_SKIP:
|
|
ksft_test_result_skip("%s\n", tests[i].name);
|
|
break;
|
|
default:
|
|
ret = EXIT_FAILURE;
|
|
ksft_test_result_fail("%s\n", tests[i].name);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|