49e0263ab4
test_progs: Tests new kfunc bpf_task_under_cgroup(). The bpf program saves the new task's pid within a given cgroup to the remote_pid, which is convenient for the user-mode program to verify the test correctness. The user-mode program creates its own mount namespace, and mounts the cgroupsv2 hierarchy in there, call the fork syscall, then check if remote_pid and local_pid are unequal. Signed-off-by: Feng Zhou <zhoufeng.zf@bytedance.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/r/20230506031545.35991-3-zhoufeng.zf@bytedance.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Bytedance */
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#include <sys/syscall.h>
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#include <test_progs.h>
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#include <cgroup_helpers.h>
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#include "test_task_under_cgroup.skel.h"
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#define FOO "/foo"
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void test_task_under_cgroup(void)
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{
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struct test_task_under_cgroup *skel;
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int ret, foo;
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pid_t pid;
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foo = test__join_cgroup(FOO);
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if (!ASSERT_OK(foo < 0, "cgroup_join_foo"))
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return;
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skel = test_task_under_cgroup__open();
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if (!ASSERT_OK_PTR(skel, "test_task_under_cgroup__open"))
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goto cleanup;
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skel->rodata->local_pid = getpid();
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skel->bss->remote_pid = getpid();
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skel->rodata->cgid = get_cgroup_id(FOO);
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ret = test_task_under_cgroup__load(skel);
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if (!ASSERT_OK(ret, "test_task_under_cgroup__load"))
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goto cleanup;
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ret = test_task_under_cgroup__attach(skel);
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if (!ASSERT_OK(ret, "test_task_under_cgroup__attach"))
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goto cleanup;
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pid = fork();
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if (pid == 0)
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exit(0);
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ret = (pid == -1);
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if (ASSERT_OK(ret, "fork process"))
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wait(NULL);
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test_task_under_cgroup__detach(skel);
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ASSERT_NEQ(skel->bss->remote_pid, skel->rodata->local_pid,
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"test task_under_cgroup");
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cleanup:
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test_task_under_cgroup__destroy(skel);
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close(foo);
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}
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