From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2AC86C61DA4 for ; Fri, 24 Feb 2023 02:38:43 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 3E3DE3CBB91 for ; Fri, 24 Feb 2023 03:38:41 +0100 (CET) Received: from in-5.smtp.seeweb.it (in-5.smtp.seeweb.it [217.194.8.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id B08963CB05A for ; Fri, 24 Feb 2023 03:38:29 +0100 (CET) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by in-5.smtp.seeweb.it (Postfix) with ESMTPS id 6C204600CC7 for ; Fri, 24 Feb 2023 03:38:26 +0100 (CET) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 24C815FCC4; Fri, 24 Feb 2023 02:38:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1677206305; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=O3alG+SmK1btiJTE4sp6Ig1fFO6y/mnQ9g2SSFInXqQ=; b=Qa7GR271FY0qz/lZ+j+fi0SvJJhvr65iD5gi7e+qv6XjsGW7VaFawxYGs9UueL5gOebCc9 GzDgCI7jxuY6VjWRzrlDdpThn/R4D+wmgWmgsVDjf17gvzYyV5fYhVdoy+jVSWB7uR7jwU C2v+byZuBwXGFjL+3pGSERDBbsPp85M= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 55D4F1342C; Fri, 24 Feb 2023 02:38:24 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id TESrCyAj+GOEAQAAMHmgww (envelope-from ); Fri, 24 Feb 2023 02:38:24 +0000 To: ltp@lists.linux.it Date: Thu, 23 Feb 2023 21:38:15 -0500 Message-Id: <20230224023815.28273-1-wegao@suse.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.102.4 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v1] kill01: New case cgroup kill X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Wei Gao via ltp Reply-To: Wei Gao Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Move basic test from kernel for cgroup kill button. Signed-off-by: Wei Gao --- runtest/controllers | 1 + testcases/kernel/controllers/kill/.gitignore | 3 + testcases/kernel/controllers/kill/Makefile | 13 + .../kernel/controllers/kill/cgroup_util.c | 668 ++++++++++++++++++ .../kernel/controllers/kill/cgroup_util.h | 59 ++ testcases/kernel/controllers/kill/kill01.c | 336 +++++++++ 6 files changed, 1080 insertions(+) create mode 100644 testcases/kernel/controllers/kill/.gitignore create mode 100644 testcases/kernel/controllers/kill/Makefile create mode 100644 testcases/kernel/controllers/kill/cgroup_util.c create mode 100644 testcases/kernel/controllers/kill/cgroup_util.h create mode 100644 testcases/kernel/controllers/kill/kill01.c diff --git a/runtest/controllers b/runtest/controllers index 8d1b936bf..2f69a8ec2 100644 --- a/runtest/controllers +++ b/runtest/controllers @@ -23,6 +23,7 @@ memcontrol01 memcontrol01 memcontrol02 memcontrol02 memcontrol03 memcontrol03 memcontrol04 memcontrol04 +kill01 kill01 cgroup_fj_function_debug cgroup_fj_function.sh debug cgroup_fj_function_cpuset cgroup_fj_function.sh cpuset diff --git a/testcases/kernel/controllers/kill/.gitignore b/testcases/kernel/controllers/kill/.gitignore new file mode 100644 index 000000000..a79fc6c6b --- /dev/null +++ b/testcases/kernel/controllers/kill/.gitignore @@ -0,0 +1,3 @@ +/kill01 +/kill01.o +/cgroup_util.o diff --git a/testcases/kernel/controllers/kill/Makefile b/testcases/kernel/controllers/kill/Makefile new file mode 100644 index 000000000..89f70903e --- /dev/null +++ b/testcases/kernel/controllers/kill/Makefile @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-or-later + +top_srcdir ?= ../../../.. + +include $(top_srcdir)/include/mk/testcases.mk + +MAKE_TARGETS := kill01 +kill01: cgroup_util.o kill01.o + $(LINK.o) $^ $(LOADLIBES) $(LDLIBS) $(OUTPUT_OPTION) + +kill01.o cgroup_util.o : %.o: %.c + +include $(top_srcdir)/include/mk/generic_leaf_target.mk diff --git a/testcases/kernel/controllers/kill/cgroup_util.c b/testcases/kernel/controllers/kill/cgroup_util.c new file mode 100644 index 000000000..662395146 --- /dev/null +++ b/testcases/kernel/controllers/kill/cgroup_util.c @@ -0,0 +1,668 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2012 Christian Brauner + */ + + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "lapi/syscalls.h" +#include "cgroup_util.h" + +struct __clone_args { + __aligned_u64 flags; + __aligned_u64 pidfd; + __aligned_u64 child_tid; + __aligned_u64 parent_tid; + __aligned_u64 exit_signal; + __aligned_u64 stack; + __aligned_u64 stack_size; + __aligned_u64 tls; +#ifndef CLONE_ARGS_SIZE_VER0 +#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */ +#endif + __aligned_u64 set_tid; + __aligned_u64 set_tid_size; +#ifndef CLONE_ARGS_SIZE_VER1 +#define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */ +#endif + __aligned_u64 cgroup; +#ifndef CLONE_ARGS_SIZE_VER2 +#define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */ +#endif +}; + +static pid_t sys_clone3(struct __clone_args *args, size_t size) +{ + fflush(stdout); + fflush(stderr); + return syscall(__NR_clone3, args, size); +} + +/* Returns read len on success, or -errno on failure. */ +static ssize_t read_text(const char *path, char *buf, size_t max_len) +{ + ssize_t len; + int fd; + + fd = open(path, O_RDONLY); + if (fd < 0) + return -errno; + + len = read(fd, buf, max_len - 1); + + if (len >= 0) + buf[len] = 0; + + close(fd); + return len < 0 ? -errno : len; +} + +/* Returns written len on success, or -errno on failure. */ +static ssize_t write_text(const char *path, char *buf, ssize_t len) +{ + int fd; + + fd = open(path, O_WRONLY | O_APPEND); + if (fd < 0) + return -errno; + + len = write(fd, buf, len); + close(fd); + return len < 0 ? -errno : len; +} + +char *cg_name(const char *root, const char *name) +{ + size_t len = strlen(root) + strlen(name) + 2; + char *ret = malloc(len); + + snprintf(ret, len, "%s/%s", root, name); + + return ret; +} + +char *cg_name_indexed(const char *root, const char *name, int index) +{ + size_t len = strlen(root) + strlen(name) + 10; + char *ret = malloc(len); + + snprintf(ret, len, "%s/%s_%d", root, name, index); + + return ret; +} + +char *cg_control(const char *cgroup, const char *control) +{ + size_t len = strlen(cgroup) + strlen(control) + 2; + char *ret = malloc(len); + + snprintf(ret, len, "%s/%s", cgroup, control); + + return ret; +} + +/* Returns 0 on success, or -errno on failure. */ +int cg_read(const char *cgroup, const char *control, char *buf, size_t len) +{ + char path[PATH_MAX]; + ssize_t ret; + + snprintf(path, sizeof(path), "%s/%s", cgroup, control); + + ret = read_text(path, buf, len); + return ret >= 0 ? 0 : ret; +} + +int cg_read_strcmp(const char *cgroup, const char *control, + const char *expected) +{ + size_t size; + char *buf; + int ret; + + /* Handle the case of comparing against empty string */ + if (!expected) + return -1; + + size = strlen(expected) + 1; + + buf = malloc(size); + if (!buf) + return -1; + + if (cg_read(cgroup, control, buf, size)) { + free(buf); + return -1; + } + + ret = strcmp(expected, buf); + free(buf); + return ret; +} + +int cg_read_strstr(const char *cgroup, const char *control, const char *needle) +{ + char buf[PAGE_SIZE]; + + if (cg_read(cgroup, control, buf, sizeof(buf))) + return -1; + + return strstr(buf, needle) ? 0 : -1; +} + +long cg_read_long(const char *cgroup, const char *control) +{ + char buf[128]; + + if (cg_read(cgroup, control, buf, sizeof(buf))) + return -1; + + return atol(buf); +} + +long cg_read_key_long(const char *cgroup, const char *control, const char *key) +{ + char buf[PAGE_SIZE]; + char *ptr; + + if (cg_read(cgroup, control, buf, sizeof(buf))) + return -1; + + ptr = strstr(buf, key); + if (!ptr) + return -1; + + return atol(ptr + strlen(key)); +} + +long cg_read_lc(const char *cgroup, const char *control) +{ + char buf[PAGE_SIZE]; + static const char delim[] = "\n"; + char *line; + long cnt = 0; + + if (cg_read(cgroup, control, buf, sizeof(buf))) + return -1; + + for (line = strtok(buf, delim); line; line = strtok(NULL, delim)) + cnt++; + + return cnt; +} + +/* Returns 0 on success, or -errno on failure. */ +int cg_write(const char *cgroup, const char *control, char *buf) +{ + char path[PATH_MAX]; + ssize_t len = strlen(buf), ret; + + snprintf(path, sizeof(path), "%s/%s", cgroup, control); + ret = write_text(path, buf, len); + return ret == len ? 0 : ret; +} + +int cg_write_numeric(const char *cgroup, const char *control, long value) +{ + char buf[64]; + int ret; + + ret = sprintf(buf, "%lu", value); + if (ret < 0) + return ret; + + return cg_write(cgroup, control, buf); +} + +int cg_find_unified_root(char *root, size_t len) +{ + char buf[10 * PAGE_SIZE]; + char *fs, *mount, *type; + static const char delim[] = "\n\t "; + + if (read_text("/proc/self/mounts", buf, sizeof(buf)) <= 0) + return -1; + + /* + * Example: + * cgroup /sys/fs/cgroup cgroup2 rw,seclabel,noexec,relatime 0 0 + */ + for (fs = strtok(buf, delim); fs; fs = strtok(NULL, delim)) { + mount = strtok(NULL, delim); + type = strtok(NULL, delim); + strtok(NULL, delim); + strtok(NULL, delim); + strtok(NULL, delim); + + if (strcmp(type, "cgroup2") == 0) { + strncpy(root, mount, len); + return 0; + } + } + + return -1; +} + +int cg_create(const char *cgroup) +{ + return mkdir(cgroup, 0755); +} + +int cg_wait_for_proc_count(const char *cgroup, int count) +{ + char buf[10 * PAGE_SIZE] = {0}; + int attempts; + char *ptr; + + for (attempts = 10; attempts >= 0; attempts--) { + int nr = 0; + + if (cg_read(cgroup, "cgroup.procs", buf, sizeof(buf))) + break; + + for (ptr = buf; *ptr; ptr++) + if (*ptr == '\n') + nr++; + + if (nr >= count) + return 0; + + usleep(100000); + } + + return -1; +} + +int cg_killall(const char *cgroup) +{ + char buf[PAGE_SIZE]; + char *ptr = buf; + + /* If cgroup.kill exists use it. */ + if (!cg_write(cgroup, "cgroup.kill", "1")) + return 0; + + if (cg_read(cgroup, "cgroup.procs", buf, sizeof(buf))) + return -1; + + while (ptr < buf + sizeof(buf)) { + int pid = strtol(ptr, &ptr, 10); + + if (pid == 0) + break; + if (*ptr) + ptr++; + else + break; + if (kill(pid, SIGKILL)) + return -1; + } + + return 0; +} + +int cg_destroy(const char *cgroup) +{ + int ret; + +retry: + ret = rmdir(cgroup); + if (ret && errno == EBUSY) { + cg_killall(cgroup); + usleep(100); + goto retry; + } + + if (ret && errno == ENOENT) + ret = 0; + + return ret; +} + +int cg_enter(const char *cgroup, int pid) +{ + char pidbuf[64]; + + snprintf(pidbuf, sizeof(pidbuf), "%d", pid); + return cg_write(cgroup, "cgroup.procs", pidbuf); +} + +int cg_enter_current(const char *cgroup) +{ + return cg_write(cgroup, "cgroup.procs", "0"); +} + +int cg_enter_current_thread(const char *cgroup) +{ + return cg_write(cgroup, "cgroup.threads", "0"); +} + +int cg_run(const char *cgroup, + int (*fn)(const char *cgroup, void *arg), + void *arg) +{ + int pid, retcode; + + pid = fork(); + if (pid < 0) { + return pid; + } else if (pid == 0) { + char buf[64]; + + snprintf(buf, sizeof(buf), "%d", getpid()); + if (cg_write(cgroup, "cgroup.procs", buf)) + exit(EXIT_FAILURE); + exit(fn(cgroup, arg)); + } else { + waitpid(pid, &retcode, 0); + if (WIFEXITED(retcode)) + return WEXITSTATUS(retcode); + else + return -1; + } +} + +pid_t clone_into_cgroup(int cgroup_fd) +{ +#ifdef CLONE_ARGS_SIZE_VER2 + pid_t pid; + + struct __clone_args args = { + .flags = CLONE_INTO_CGROUP, + .exit_signal = SIGCHLD, + .cgroup = cgroup_fd, + }; + + pid = sys_clone3(&args, sizeof(struct __clone_args)); + /* + * Verify that this is a genuine test failure: + * ENOSYS -> clone3() not available + * E2BIG -> CLONE_INTO_CGROUP not available + */ + if (pid < 0 && (errno == ENOSYS || errno == E2BIG)) + goto pretend_enosys; + + return pid; + +pretend_enosys: +#endif + errno = ENOSYS; + return -ENOSYS; +} + +int clone_reap(pid_t pid, int options) +{ + int ret; + siginfo_t info = { + .si_signo = 0, + }; + +again: + ret = waitid(P_PID, pid, &info, options | __WALL | __WNOTHREAD); + if (ret < 0) { + if (errno == EINTR) + goto again; + return -1; + } + + if (options & WEXITED) { + if (WIFEXITED(info.si_status)) + return WEXITSTATUS(info.si_status); + } + + if (options & WSTOPPED) { + if (WIFSTOPPED(info.si_status)) + return WSTOPSIG(info.si_status); + } + + if (options & WCONTINUED) { + if (WIFCONTINUED(info.si_status)) + return 0; + } + + return -1; +} + +int dirfd_open_opath(const char *dir) +{ + return open(dir, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW | O_PATH); +} + +#define close_prot_errno(fd) \ + do { \ + if (fd >= 0) { \ + int _e_ = errno; \ + close(fd); \ + errno = _e_; \ + } \ + } while (0) +static int clone_into_cgroup_run_nowait(const char *cgroup, + int (*fn)(void)) +{ + int cgroup_fd; + pid_t pid; + + cgroup_fd = dirfd_open_opath(cgroup); + if (cgroup_fd < 0) + return -1; + + pid = clone_into_cgroup(cgroup_fd); + close_prot_errno(cgroup_fd); + if (pid == 0) + exit(fn()); + + return pid; +} + +int cg_run_nowait(const char *cgroup, + int (*fn)(void)) +{ + int pid; + + pid = clone_into_cgroup_run_nowait(cgroup, fn); + if (pid > 0) + return pid; + + /* Genuine test failure. */ + if (pid < 0 && errno != ENOSYS) + return -1; + + pid = fork(); + if (pid == 0) { + char buf[64]; + + snprintf(buf, sizeof(buf), "%d", getpid()); + if (cg_write(cgroup, "cgroup.procs", buf)) + exit(EXIT_FAILURE); + exit(fn()); + } + + return pid; +} + +int get_temp_fd(void) +{ + return open(".", O_TMPFILE | O_RDWR | O_EXCL, 0600); +} + +int alloc_anon(void *arg) +{ + size_t size = (unsigned long)arg; + char *buf, *ptr; + + buf = malloc(size); + for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + *ptr = 0; + + free(buf); + return 0; +} + +int is_swap_enabled(void) +{ + char buf[PAGE_SIZE]; + static const char delim[] = "\n"; + int cnt = 0; + char *line; + + if (read_text("/proc/swaps", buf, sizeof(buf)) <= 0) + return -1; + + for (line = strtok(buf, delim); line; line = strtok(NULL, delim)) + cnt++; + + return cnt > 1; +} + +int set_oom_adj_score(int pid, int score) +{ + char path[PATH_MAX]; + int fd, len; + + sprintf(path, "/proc/%d/oom_score_adj", pid); + + fd = open(path, O_WRONLY | O_APPEND); + if (fd < 0) + return fd; + + len = dprintf(fd, "%d", score); + if (len < 0) { + close(fd); + return len; + } + + close(fd); + return 0; +} + +int proc_mount_contains(const char *option) +{ + char buf[4 * PAGE_SIZE]; + ssize_t read; + + read = read_text("/proc/mounts", buf, sizeof(buf)); + if (read < 0) + return read; + + return strstr(buf, option) != NULL; +} + +ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size) +{ + char path[PATH_MAX]; + ssize_t ret; + + if (!pid) + snprintf(path, sizeof(path), "/proc/%s/%s", + thread ? "thread-self" : "self", item); + else + snprintf(path, sizeof(path), "/proc/%d/%s", pid, item); + + ret = read_text(path, buf, size); + return ret < 0 ? -1 : ret; +} + +int proc_read_strstr(int pid, bool thread, const char *item, const char *needle) +{ + char buf[PAGE_SIZE]; + + if (proc_read_text(pid, thread, item, buf, sizeof(buf)) < 0) + return -1; + + return strstr(buf, needle) ? 0 : -1; +} + +int clone_into_cgroup_run_wait(const char *cgroup) +{ + int cgroup_fd; + pid_t pid; + + cgroup_fd = dirfd_open_opath(cgroup); + if (cgroup_fd < 0) + return -1; + + pid = clone_into_cgroup(cgroup_fd); + close_prot_errno(cgroup_fd); + if (pid < 0) + return -1; + + if (pid == 0) + exit(EXIT_SUCCESS); + + /* + * We don't care whether this fails. We only care whether the initial + * clone succeeded. + */ + (void)clone_reap(pid, WEXITED); + return 0; +} + +static int __prepare_for_wait(const char *cgroup, const char *filename) +{ + int fd, ret = -1; + + fd = inotify_init1(0); + if (fd == -1) + return fd; + + ret = inotify_add_watch(fd, cg_control(cgroup, filename), IN_MODIFY); + if (ret == -1) { + close(fd); + fd = -1; + } + + return fd; +} + +int cg_prepare_for_wait(const char *cgroup) +{ + return __prepare_for_wait(cgroup, "cgroup.events"); +} + +int memcg_prepare_for_wait(const char *cgroup) +{ + return __prepare_for_wait(cgroup, "memory.events"); +} + +int cg_wait_for(int fd) +{ + int ret = -1; + struct pollfd fds = { + .fd = fd, + .events = POLLIN, + }; + + while (true) { + ret = poll(&fds, 1, 10000); + + if (ret == -1) { + if (errno == EINTR) + continue; + + break; + } + + if (ret > 0 && fds.revents & POLLIN) { + ret = 0; + break; + } + } + + return ret; +} diff --git a/testcases/kernel/controllers/kill/cgroup_util.h b/testcases/kernel/controllers/kill/cgroup_util.h new file mode 100644 index 000000000..bc068eead --- /dev/null +++ b/testcases/kernel/controllers/kill/cgroup_util.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include +#include + +#define PAGE_SIZE 4096 +#define MB(x) (x << 20) +#define USEC_PER_SEC 1000000L +#define NSEC_PER_SEC 1000000000L + +/* + * Checks if two given values differ by less than err% of their sum. + */ +static inline int values_close(long a, long b, int err) +{ + return abs(a - b) <= (a + b) / 100 * err; +} + +extern int cg_find_unified_root(char *root, size_t len); +extern char *cg_name(const char *root, const char *name); +extern char *cg_name_indexed(const char *root, const char *name, int index); +extern char *cg_control(const char *cgroup, const char *control); +extern int cg_create(const char *cgroup); +extern int cg_destroy(const char *cgroup); +extern int cg_read(const char *cgroup, const char *control, + char *buf, size_t len); +extern int cg_read_strcmp(const char *cgroup, const char *control, + const char *expected); +extern int cg_read_strstr(const char *cgroup, const char *control, + const char *needle); +extern long cg_read_long(const char *cgroup, const char *control); +long cg_read_key_long(const char *cgroup, const char *control, const char *key); +extern long cg_read_lc(const char *cgroup, const char *control); +extern int cg_write(const char *cgroup, const char *control, char *buf); +int cg_write_numeric(const char *cgroup, const char *control, long value); +extern int cg_run(const char *cgroup, + int (*fn)(const char *cgroup, void *arg), + void *arg); +extern int cg_enter(const char *cgroup, int pid); +extern int cg_enter_current(const char *cgroup); +extern int cg_enter_current_thread(const char *cgroup); +extern int cg_run_nowait(const char *cgroup, + int (*fn)(void)); +extern int get_temp_fd(void); +extern int alloc_pagecache(int fd, size_t size); +extern int alloc_anon(void *arg); +extern int is_swap_enabled(void); +extern int set_oom_adj_score(int pid, int score); +extern int cg_wait_for_proc_count(const char *cgroup, int count); +extern int cg_killall(const char *cgroup); +int proc_mount_contains(const char *option); +extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size); +extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle); +extern pid_t clone_into_cgroup(int cgroup_fd); +extern int clone_reap(pid_t pid, int options); +extern int clone_into_cgroup_run_wait(const char *cgroup); +extern int dirfd_open_opath(const char *dir); +extern int cg_prepare_for_wait(const char *cgroup); +extern int memcg_prepare_for_wait(const char *cgroup); +extern int cg_wait_for(int fd); diff --git a/testcases/kernel/controllers/kill/kill01.c b/testcases/kernel/controllers/kill/kill01.c new file mode 100644 index 000000000..e589b6c16 --- /dev/null +++ b/testcases/kernel/controllers/kill/kill01.c @@ -0,0 +1,336 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2012 Christian Brauner + */ + +/*\ + * [Description] + * + * Basic cgroup kill test. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "lapi/syscalls.h" +#include "cgroup_util.h" +#include "tst_test.h" + +/* define kselftest exit codes */ +#define KSFT_PASS 0 +#define KSFT_FAIL 1 +#define KSFT_XFAIL 2 +#define KSFT_XPASS 3 +#define KSFT_SKIP 4 + +static int wait_for_pid(pid_t pid) +{ + int status, ret; + +again: + ret = waitpid(pid, &status, 0); + if (ret == -1) { + if (errno == EINTR) + goto again; + + return -1; + } + + if (!WIFEXITED(status)) + return -1; + + return WEXITSTATUS(status); +} + + +/* + * Kill the given cgroup and wait for the inotify signal. + * If there are no events in 10 seconds, treat this as an error. + * Then check that the cgroup is in the desired state. + */ +static int cg_kill_wait(const char *cgroup) +{ + int fd, ret = -1; + + fd = cg_prepare_for_wait(cgroup); + if (fd < 0) + return fd; + + ret = cg_write(cgroup, "cgroup.kill", "1"); + if (ret) + goto out; + + ret = cg_wait_for(fd); + if (ret) + goto out; + +out: + close(fd); + return ret; +} + +/* + * A simple process running in a sleep loop until being + * re-parented. + */ +static int child_fn(void) +{ + int ppid = getppid(); + + while (getppid() == ppid) + usleep(1000); + + return getppid() == ppid; +} + +static int test_cgkill_simple(const char *root) +{ + pid_t pids[100]; + int ret = KSFT_FAIL; + char *cgroup = NULL; + int i; + + cgroup = cg_name(root, "cg_test_simple"); + if (!cgroup) + goto cleanup; + + if (cg_create(cgroup)) + goto cleanup; + + for (i = 0; i < 100; i++) + pids[i] = cg_run_nowait(cgroup, child_fn); + + if (cg_wait_for_proc_count(cgroup, 100)) + goto cleanup; + + if (cg_read_strcmp(cgroup, "cgroup.events", "populated 1\n")) + goto cleanup; + + if (cg_kill_wait(cgroup)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + for (i = 0; i < 100; i++) + wait_for_pid(pids[i]); + + if (ret == KSFT_PASS && + cg_read_strcmp(cgroup, "cgroup.events", "populated 0\n")) + ret = KSFT_FAIL; + + if (cgroup) + cg_destroy(cgroup); + free(cgroup); + return ret; +} + +/* + * The test creates the following hierarchy: + * A + * / / \ \ + * B E I K + * /\ | + * C D F + * | + * G + * | + * H + * + * with a process in C, H and 3 processes in K. + * Then it tries to kill the whole tree. + */ +static int test_cgkill_tree(const char *root) +{ + pid_t pids[5]; + char *cgroup[10] = {0}; + int ret = KSFT_FAIL; + int i; + + cgroup[0] = cg_name(root, "cg_test_tree_A"); + if (!cgroup[0]) + goto cleanup; + + cgroup[1] = cg_name(cgroup[0], "B"); + if (!cgroup[1]) + goto cleanup; + + cgroup[2] = cg_name(cgroup[1], "C"); + if (!cgroup[2]) + goto cleanup; + + cgroup[3] = cg_name(cgroup[1], "D"); + if (!cgroup[3]) + goto cleanup; + + cgroup[4] = cg_name(cgroup[0], "E"); + if (!cgroup[4]) + goto cleanup; + + cgroup[5] = cg_name(cgroup[4], "F"); + if (!cgroup[5]) + goto cleanup; + + cgroup[6] = cg_name(cgroup[5], "G"); + if (!cgroup[6]) + goto cleanup; + + cgroup[7] = cg_name(cgroup[6], "H"); + if (!cgroup[7]) + goto cleanup; + + cgroup[8] = cg_name(cgroup[0], "I"); + if (!cgroup[8]) + goto cleanup; + + cgroup[9] = cg_name(cgroup[0], "K"); + if (!cgroup[9]) + goto cleanup; + + for (i = 0; i < 10; i++) + if (cg_create(cgroup[i])) + goto cleanup; + + pids[0] = cg_run_nowait(cgroup[2], child_fn); + pids[1] = cg_run_nowait(cgroup[7], child_fn); + pids[2] = cg_run_nowait(cgroup[9], child_fn); + pids[3] = cg_run_nowait(cgroup[9], child_fn); + pids[4] = cg_run_nowait(cgroup[9], child_fn); + + /* + * Wait until all child processes will enter + * corresponding cgroups. + */ + + if (cg_wait_for_proc_count(cgroup[2], 1) || + cg_wait_for_proc_count(cgroup[7], 1) || + cg_wait_for_proc_count(cgroup[9], 3)) + goto cleanup; + + /* + * Kill A and check that we get an empty notification. + */ + if (cg_kill_wait(cgroup[0])) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + for (i = 0; i < 5; i++) + wait_for_pid(pids[i]); + + if (ret == KSFT_PASS && + cg_read_strcmp(cgroup[0], "cgroup.events", "populated 0\n")) + ret = KSFT_FAIL; + + for (i = 9; i >= 0 && cgroup[i]; i--) { + cg_destroy(cgroup[i]); + free(cgroup[i]); + } + + return ret; +} + +static int forkbomb_fn(void) +{ + int ppid; + + fork(); + fork(); + + ppid = getppid(); + + while (getppid() == ppid) + usleep(1000); + + return getppid() == ppid; +} + +/* + * The test runs a fork bomb in a cgroup and tries to kill it. + */ +static int test_cgkill_forkbomb(const char *root) +{ + int ret = KSFT_FAIL; + char *cgroup = NULL; + pid_t pid = -ESRCH; + + cgroup = cg_name(root, "cg_forkbomb_test"); + if (!cgroup) + goto cleanup; + + if (cg_create(cgroup)) + goto cleanup; + + pid = cg_run_nowait(cgroup, forkbomb_fn); + if (pid < 0) + goto cleanup; + + usleep(100000); + + if (cg_kill_wait(cgroup)) + goto cleanup; + + if (cg_wait_for_proc_count(cgroup, 0)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + if (pid > 0) + wait_for_pid(pid); + + if (ret == KSFT_PASS && + cg_read_strcmp(cgroup, "cgroup.events", "populated 0\n")) + ret = KSFT_FAIL; + + if (cgroup) + cg_destroy(cgroup); + free(cgroup); + return ret; +} + +#define T(x) { x, #x } +static struct tcase { + int (*fn)(const char *root); + const char *tname; +} tcases[] = { + T(test_cgkill_simple), + T(test_cgkill_tree), + T(test_cgkill_forkbomb), +}; +#undef T + +static void run_test(unsigned int n) +{ + char root[PATH_MAX]; + struct tcase *tc = &tcases[n]; + + if (cg_find_unified_root(root, sizeof(root))) + tst_brk(TBROK, "cgroup v2 isn't mounted"); + switch (tc->fn(root)) { + case KSFT_PASS: + tst_res(TPASS, "Successfully tested %s", tc->tname); + break; + case KSFT_SKIP: + tst_res(TCONF, "Skip %s since not support", tc->tname); + break; + default: + tst_res(TFAIL, "%s failed", tc->tname); + break; + } +} + +static struct tst_test test = { + .tcnt = ARRAY_SIZE(tcases), + .test = run_test, + .forks_child = 1, +}; -- 2.35.3 -- Mailing list info: https://lists.linux.it/listinfo/ltp