159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.*/
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#define _GNU_SOURCE
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <test_progs.h>
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#include <bpf/btf.h>
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#include "rcu_read_lock.skel.h"
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#include "cgroup_helpers.h"
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static unsigned long long cgroup_id;
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static void test_success(void)
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{
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struct rcu_read_lock *skel;
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int err;
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skel = rcu_read_lock__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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skel->bss->target_pid = syscall(SYS_gettid);
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bpf_program__set_autoload(skel->progs.get_cgroup_id, true);
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bpf_program__set_autoload(skel->progs.task_succ, true);
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bpf_program__set_autoload(skel->progs.no_lock, true);
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bpf_program__set_autoload(skel->progs.two_regions, true);
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bpf_program__set_autoload(skel->progs.non_sleepable_1, true);
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bpf_program__set_autoload(skel->progs.non_sleepable_2, true);
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err = rcu_read_lock__load(skel);
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if (!ASSERT_OK(err, "skel_load"))
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goto out;
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err = rcu_read_lock__attach(skel);
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if (!ASSERT_OK(err, "skel_attach"))
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goto out;
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syscall(SYS_getpgid);
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ASSERT_EQ(skel->bss->task_storage_val, 2, "task_storage_val");
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ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
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out:
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rcu_read_lock__destroy(skel);
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}
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static void test_rcuptr_acquire(void)
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{
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struct rcu_read_lock *skel;
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int err;
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skel = rcu_read_lock__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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skel->bss->target_pid = syscall(SYS_gettid);
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bpf_program__set_autoload(skel->progs.task_acquire, true);
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err = rcu_read_lock__load(skel);
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if (!ASSERT_OK(err, "skel_load"))
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goto out;
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err = rcu_read_lock__attach(skel);
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ASSERT_OK(err, "skel_attach");
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out:
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rcu_read_lock__destroy(skel);
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}
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static const char * const inproper_region_tests[] = {
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"miss_lock",
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"miss_unlock",
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"non_sleepable_rcu_mismatch",
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"inproper_sleepable_helper",
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"inproper_sleepable_kfunc",
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"nested_rcu_region",
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};
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static void test_inproper_region(void)
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{
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struct rcu_read_lock *skel;
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struct bpf_program *prog;
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int i, err;
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for (i = 0; i < ARRAY_SIZE(inproper_region_tests); i++) {
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skel = rcu_read_lock__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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prog = bpf_object__find_program_by_name(skel->obj, inproper_region_tests[i]);
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if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
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goto out;
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bpf_program__set_autoload(prog, true);
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err = rcu_read_lock__load(skel);
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ASSERT_ERR(err, "skel_load");
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out:
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rcu_read_lock__destroy(skel);
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}
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}
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static const char * const rcuptr_misuse_tests[] = {
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"task_untrusted_non_rcuptr",
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"task_untrusted_rcuptr",
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"cross_rcu_region",
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};
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static void test_rcuptr_misuse(void)
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{
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struct rcu_read_lock *skel;
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struct bpf_program *prog;
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int i, err;
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for (i = 0; i < ARRAY_SIZE(rcuptr_misuse_tests); i++) {
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skel = rcu_read_lock__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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prog = bpf_object__find_program_by_name(skel->obj, rcuptr_misuse_tests[i]);
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if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
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goto out;
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bpf_program__set_autoload(prog, true);
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err = rcu_read_lock__load(skel);
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ASSERT_ERR(err, "skel_load");
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out:
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rcu_read_lock__destroy(skel);
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}
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}
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void test_rcu_read_lock(void)
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{
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struct btf *vmlinux_btf;
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int cgroup_fd;
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vmlinux_btf = btf__load_vmlinux_btf();
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if (!ASSERT_OK_PTR(vmlinux_btf, "could not load vmlinux BTF"))
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return;
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if (btf__find_by_name_kind(vmlinux_btf, "rcu", BTF_KIND_TYPE_TAG) < 0) {
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test__skip();
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goto out;
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}
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cgroup_fd = test__join_cgroup("/rcu_read_lock");
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if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /rcu_read_lock"))
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goto out;
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cgroup_id = get_cgroup_id("/rcu_read_lock");
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if (test__start_subtest("success"))
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test_success();
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if (test__start_subtest("rcuptr_acquire"))
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test_rcuptr_acquire();
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if (test__start_subtest("negative_tests_inproper_region"))
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test_inproper_region();
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if (test__start_subtest("negative_tests_rcuptr_misuse"))
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test_rcuptr_misuse();
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close(cgroup_fd);
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out:
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btf__free(vmlinux_btf);
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}
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