selftests/bpf: Add cgroup kfunc / kptr selftests
This patch adds a selftest suite to validate the cgroup kfuncs that were added in the prior patch. Signed-off-by: David Vernet <void@manifault.com> Link: https://lore.kernel.org/r/20221122055458.173143-3-void@manifault.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
David Vernet
Alexei Starovoitov
parent
fda01efc61
commit
f583ddf15e
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@ -10,6 +10,7 @@ bpf_nf # JIT does not support calling kernel f
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bpf_tcp_ca # JIT does not support calling kernel function (kfunc)
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cb_refs # expected error message unexpected error: -524 (trampoline)
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cgroup_hierarchical_stats # JIT does not support calling kernel function (kfunc)
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cgrp_kfunc # JIT does not support calling kernel function
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cgrp_local_storage # prog_attach unexpected error: -524 (trampoline)
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core_read_macros # unknown func bpf_probe_read#4 (overlapping)
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d_path # failed to auto-attach program 'prog_stat': -524 (trampoline)
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@ -0,0 +1,174 @@
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// 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 <cgroup_helpers.h>
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#include <test_progs.h>
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#include "cgrp_kfunc_failure.skel.h"
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#include "cgrp_kfunc_success.skel.h"
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static size_t log_buf_sz = 1 << 20; /* 1 MB */
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static char obj_log_buf[1048576];
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static struct cgrp_kfunc_success *open_load_cgrp_kfunc_skel(void)
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{
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struct cgrp_kfunc_success *skel;
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int err;
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skel = cgrp_kfunc_success__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return NULL;
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skel->bss->pid = getpid();
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err = cgrp_kfunc_success__load(skel);
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if (!ASSERT_OK(err, "skel_load"))
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goto cleanup;
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return skel;
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cleanup:
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cgrp_kfunc_success__destroy(skel);
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return NULL;
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}
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static int mkdir_rm_test_dir(void)
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{
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int fd;
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const char *cgrp_path = "cgrp_kfunc";
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fd = create_and_get_cgroup(cgrp_path);
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if (!ASSERT_GT(fd, 0, "mkdir_cgrp_fd"))
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return -1;
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close(fd);
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remove_cgroup(cgrp_path);
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return 0;
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}
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static void run_success_test(const char *prog_name)
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{
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struct cgrp_kfunc_success *skel;
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struct bpf_program *prog;
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struct bpf_link *link = NULL;
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skel = open_load_cgrp_kfunc_skel();
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if (!ASSERT_OK_PTR(skel, "open_load_skel"))
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return;
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if (!ASSERT_OK(skel->bss->err, "pre_mkdir_err"))
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goto cleanup;
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prog = bpf_object__find_program_by_name(skel->obj, prog_name);
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if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
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goto cleanup;
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link = bpf_program__attach(prog);
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if (!ASSERT_OK_PTR(link, "attached_link"))
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goto cleanup;
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ASSERT_EQ(skel->bss->invocations, 0, "pre_rmdir_count");
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if (!ASSERT_OK(mkdir_rm_test_dir(), "cgrp_mkdir"))
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goto cleanup;
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ASSERT_EQ(skel->bss->invocations, 1, "post_rmdir_count");
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ASSERT_OK(skel->bss->err, "post_rmdir_err");
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cleanup:
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bpf_link__destroy(link);
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cgrp_kfunc_success__destroy(skel);
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}
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static const char * const success_tests[] = {
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"test_cgrp_acquire_release_argument",
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"test_cgrp_acquire_leave_in_map",
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"test_cgrp_xchg_release",
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"test_cgrp_get_release",
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};
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static struct {
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const char *prog_name;
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const char *expected_err_msg;
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} failure_tests[] = {
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{"cgrp_kfunc_acquire_untrusted", "R1 must be referenced or trusted"},
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{"cgrp_kfunc_acquire_fp", "arg#0 pointer type STRUCT cgroup must point"},
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{"cgrp_kfunc_acquire_unsafe_kretprobe", "reg type unsupported for arg#0 function"},
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{"cgrp_kfunc_acquire_trusted_walked", "R1 must be referenced or trusted"},
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{"cgrp_kfunc_acquire_null", "arg#0 pointer type STRUCT cgroup must point"},
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{"cgrp_kfunc_acquire_unreleased", "Unreleased reference"},
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{"cgrp_kfunc_get_non_kptr_param", "arg#0 expected pointer to map value"},
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{"cgrp_kfunc_get_non_kptr_acquired", "arg#0 expected pointer to map value"},
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{"cgrp_kfunc_get_null", "arg#0 expected pointer to map value"},
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{"cgrp_kfunc_xchg_unreleased", "Unreleased reference"},
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{"cgrp_kfunc_get_unreleased", "Unreleased reference"},
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{"cgrp_kfunc_release_untrusted", "arg#0 is untrusted_ptr_or_null_ expected ptr_ or socket"},
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{"cgrp_kfunc_release_fp", "arg#0 pointer type STRUCT cgroup must point"},
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{"cgrp_kfunc_release_null", "arg#0 is ptr_or_null_ expected ptr_ or socket"},
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{"cgrp_kfunc_release_unacquired", "release kernel function bpf_cgroup_release expects"},
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};
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static void verify_fail(const char *prog_name, const char *expected_err_msg)
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{
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LIBBPF_OPTS(bpf_object_open_opts, opts);
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struct cgrp_kfunc_failure *skel;
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int err, i;
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opts.kernel_log_buf = obj_log_buf;
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opts.kernel_log_size = log_buf_sz;
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opts.kernel_log_level = 1;
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skel = cgrp_kfunc_failure__open_opts(&opts);
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if (!ASSERT_OK_PTR(skel, "cgrp_kfunc_failure__open_opts"))
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goto cleanup;
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for (i = 0; i < ARRAY_SIZE(failure_tests); i++) {
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struct bpf_program *prog;
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const char *curr_name = failure_tests[i].prog_name;
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prog = bpf_object__find_program_by_name(skel->obj, curr_name);
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if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
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goto cleanup;
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bpf_program__set_autoload(prog, !strcmp(curr_name, prog_name));
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}
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err = cgrp_kfunc_failure__load(skel);
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if (!ASSERT_ERR(err, "unexpected load success"))
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goto cleanup;
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if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
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fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
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fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
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}
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cleanup:
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cgrp_kfunc_failure__destroy(skel);
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}
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void test_cgrp_kfunc(void)
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{
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int i, err;
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err = setup_cgroup_environment();
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if (!ASSERT_OK(err, "cgrp_env_setup"))
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goto cleanup;
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for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
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if (!test__start_subtest(success_tests[i]))
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continue;
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run_success_test(success_tests[i]);
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}
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for (i = 0; i < ARRAY_SIZE(failure_tests); i++) {
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if (!test__start_subtest(failure_tests[i].prog_name))
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continue;
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verify_fail(failure_tests[i].prog_name, failure_tests[i].expected_err_msg);
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}
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cleanup:
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cleanup_cgroup_environment();
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}
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@ -0,0 +1,71 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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#ifndef _CGRP_KFUNC_COMMON_H
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#define _CGRP_KFUNC_COMMON_H
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#include <errno.h>
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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struct __cgrps_kfunc_map_value {
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struct cgroup __kptr_ref * cgrp;
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};
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struct hash_map {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, int);
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__type(value, struct __cgrps_kfunc_map_value);
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__uint(max_entries, 1);
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} __cgrps_kfunc_map SEC(".maps");
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struct cgroup *bpf_cgroup_acquire(struct cgroup *p) __ksym;
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struct cgroup *bpf_cgroup_kptr_get(struct cgroup **pp) __ksym;
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void bpf_cgroup_release(struct cgroup *p) __ksym;
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static inline struct __cgrps_kfunc_map_value *cgrps_kfunc_map_value_lookup(struct cgroup *cgrp)
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{
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s32 id;
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long status;
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status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
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if (status)
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return NULL;
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return bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
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}
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static inline int cgrps_kfunc_map_insert(struct cgroup *cgrp)
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{
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struct __cgrps_kfunc_map_value local, *v;
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long status;
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struct cgroup *acquired, *old;
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s32 id;
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status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
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if (status)
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return status;
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local.cgrp = NULL;
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status = bpf_map_update_elem(&__cgrps_kfunc_map, &id, &local, BPF_NOEXIST);
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if (status)
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return status;
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v = bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
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if (!v) {
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bpf_map_delete_elem(&__cgrps_kfunc_map, &id);
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return -ENOENT;
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}
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acquired = bpf_cgroup_acquire(cgrp);
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old = bpf_kptr_xchg(&v->cgrp, acquired);
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if (old) {
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bpf_cgroup_release(old);
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return -EEXIST;
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}
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return 0;
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}
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#endif /* _CGRP_KFUNC_COMMON_H */
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@ -0,0 +1,260 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_helpers.h>
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#include "cgrp_kfunc_common.h"
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char _license[] SEC("license") = "GPL";
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/* Prototype for all of the program trace events below:
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*
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* TRACE_EVENT(cgroup_mkdir,
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* TP_PROTO(struct cgroup *cgrp, const char *path),
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* TP_ARGS(cgrp, path)
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*/
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static struct __cgrps_kfunc_map_value *insert_lookup_cgrp(struct cgroup *cgrp)
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{
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int status;
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status = cgrps_kfunc_map_insert(cgrp);
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if (status)
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return NULL;
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return cgrps_kfunc_map_value_lookup(cgrp);
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_acquire_untrusted, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *acquired;
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struct __cgrps_kfunc_map_value *v;
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v = insert_lookup_cgrp(cgrp);
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if (!v)
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return 0;
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/* Can't invoke bpf_cgroup_acquire() on an untrusted pointer. */
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acquired = bpf_cgroup_acquire(v->cgrp);
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bpf_cgroup_release(acquired);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_acquire_fp, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *acquired, *stack_cgrp = (struct cgroup *)&path;
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/* Can't invoke bpf_cgroup_acquire() on a random frame pointer. */
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acquired = bpf_cgroup_acquire((struct cgroup *)&stack_cgrp);
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bpf_cgroup_release(acquired);
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return 0;
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}
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SEC("kretprobe/cgroup_destroy_locked")
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int BPF_PROG(cgrp_kfunc_acquire_unsafe_kretprobe, struct cgroup *cgrp)
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{
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struct cgroup *acquired;
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/* Can't acquire an untrusted struct cgroup * pointer. */
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acquired = bpf_cgroup_acquire(cgrp);
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bpf_cgroup_release(acquired);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_acquire_trusted_walked, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *acquired;
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/* Can't invoke bpf_cgroup_acquire() on a pointer obtained from walking a trusted cgroup. */
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acquired = bpf_cgroup_acquire(cgrp->old_dom_cgrp);
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bpf_cgroup_release(acquired);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_acquire_null, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *acquired;
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/* Can't invoke bpf_cgroup_acquire() on a NULL pointer. */
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acquired = bpf_cgroup_acquire(NULL);
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if (!acquired)
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return 0;
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bpf_cgroup_release(acquired);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_acquire_unreleased, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *acquired;
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acquired = bpf_cgroup_acquire(cgrp);
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/* Acquired cgroup is never released. */
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_get_non_kptr_param, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr;
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/* Cannot use bpf_cgroup_kptr_get() on a non-kptr, even on a valid cgroup. */
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kptr = bpf_cgroup_kptr_get(&cgrp);
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if (!kptr)
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return 0;
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bpf_cgroup_release(kptr);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_get_non_kptr_acquired, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr, *acquired;
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acquired = bpf_cgroup_acquire(cgrp);
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/* Cannot use bpf_cgroup_kptr_get() on a non-map-value, even if the kptr was acquired. */
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kptr = bpf_cgroup_kptr_get(&acquired);
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bpf_cgroup_release(acquired);
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if (!kptr)
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return 0;
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bpf_cgroup_release(kptr);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_get_null, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr;
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/* Cannot use bpf_cgroup_kptr_get() on a NULL pointer. */
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kptr = bpf_cgroup_kptr_get(NULL);
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if (!kptr)
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return 0;
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bpf_cgroup_release(kptr);
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_xchg_unreleased, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr;
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struct __cgrps_kfunc_map_value *v;
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v = insert_lookup_cgrp(cgrp);
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if (!v)
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return 0;
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kptr = bpf_kptr_xchg(&v->cgrp, NULL);
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if (!kptr)
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return 0;
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/* Kptr retrieved from map is never released. */
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(cgrp_kfunc_get_unreleased, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr;
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struct __cgrps_kfunc_map_value *v;
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v = insert_lookup_cgrp(cgrp);
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if (!v)
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return 0;
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kptr = bpf_cgroup_kptr_get(&v->cgrp);
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if (!kptr)
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return 0;
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/* Kptr acquired above is never released. */
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(cgrp_kfunc_release_untrusted, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct __cgrps_kfunc_map_value *v;
|
||||
|
||||
v = insert_lookup_cgrp(cgrp);
|
||||
if (!v)
|
||||
return 0;
|
||||
|
||||
/* Can't invoke bpf_cgroup_release() on an untrusted pointer. */
|
||||
bpf_cgroup_release(v->cgrp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(cgrp_kfunc_release_fp, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct cgroup *acquired = (struct cgroup *)&path;
|
||||
|
||||
/* Cannot release random frame pointer. */
|
||||
bpf_cgroup_release(acquired);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(cgrp_kfunc_release_null, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct __cgrps_kfunc_map_value local, *v;
|
||||
long status;
|
||||
struct cgroup *acquired, *old;
|
||||
s32 id;
|
||||
|
||||
status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
|
||||
if (status)
|
||||
return 0;
|
||||
|
||||
local.cgrp = NULL;
|
||||
status = bpf_map_update_elem(&__cgrps_kfunc_map, &id, &local, BPF_NOEXIST);
|
||||
if (status)
|
||||
return status;
|
||||
|
||||
v = bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
|
||||
if (!v)
|
||||
return -ENOENT;
|
||||
|
||||
acquired = bpf_cgroup_acquire(cgrp);
|
||||
|
||||
old = bpf_kptr_xchg(&v->cgrp, acquired);
|
||||
|
||||
/* old cannot be passed to bpf_cgroup_release() without a NULL check. */
|
||||
bpf_cgroup_release(old);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(cgrp_kfunc_release_unacquired, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
/* Cannot release trusted cgroup pointer which was not acquired. */
|
||||
bpf_cgroup_release(cgrp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,125 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
|
||||
|
||||
#include <vmlinux.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include <bpf/bpf_helpers.h>
|
||||
|
||||
#include "cgrp_kfunc_common.h"
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
||||
int err, pid, invocations;
|
||||
|
||||
/* Prototype for all of the program trace events below:
|
||||
*
|
||||
* TRACE_EVENT(cgroup_mkdir,
|
||||
* TP_PROTO(struct cgroup *cgrp, const char *path),
|
||||
* TP_ARGS(cgrp, path)
|
||||
*/
|
||||
|
||||
static bool is_test_kfunc_task(void)
|
||||
{
|
||||
int cur_pid = bpf_get_current_pid_tgid() >> 32;
|
||||
bool same = pid == cur_pid;
|
||||
|
||||
if (same)
|
||||
__sync_fetch_and_add(&invocations, 1);
|
||||
|
||||
return same;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(test_cgrp_acquire_release_argument, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct cgroup *acquired;
|
||||
|
||||
if (!is_test_kfunc_task())
|
||||
return 0;
|
||||
|
||||
acquired = bpf_cgroup_acquire(cgrp);
|
||||
bpf_cgroup_release(acquired);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(test_cgrp_acquire_leave_in_map, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
long status;
|
||||
|
||||
if (!is_test_kfunc_task())
|
||||
return 0;
|
||||
|
||||
status = cgrps_kfunc_map_insert(cgrp);
|
||||
if (status)
|
||||
err = 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct cgroup *kptr;
|
||||
struct __cgrps_kfunc_map_value *v;
|
||||
long status;
|
||||
|
||||
if (!is_test_kfunc_task())
|
||||
return 0;
|
||||
|
||||
status = cgrps_kfunc_map_insert(cgrp);
|
||||
if (status) {
|
||||
err = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
v = cgrps_kfunc_map_value_lookup(cgrp);
|
||||
if (!v) {
|
||||
err = 2;
|
||||
return 0;
|
||||
}
|
||||
|
||||
kptr = bpf_kptr_xchg(&v->cgrp, NULL);
|
||||
if (!kptr) {
|
||||
err = 3;
|
||||
return 0;
|
||||
}
|
||||
|
||||
bpf_cgroup_release(kptr);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("tp_btf/cgroup_mkdir")
|
||||
int BPF_PROG(test_cgrp_get_release, struct cgroup *cgrp, const char *path)
|
||||
{
|
||||
struct cgroup *kptr;
|
||||
struct __cgrps_kfunc_map_value *v;
|
||||
long status;
|
||||
|
||||
if (!is_test_kfunc_task())
|
||||
return 0;
|
||||
|
||||
status = cgrps_kfunc_map_insert(cgrp);
|
||||
if (status) {
|
||||
err = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
v = cgrps_kfunc_map_value_lookup(cgrp);
|
||||
if (!v) {
|
||||
err = 2;
|
||||
return 0;
|
||||
}
|
||||
|
||||
kptr = bpf_cgroup_kptr_get(&v->cgrp);
|
||||
if (!kptr) {
|
||||
err = 3;
|
||||
return 0;
|
||||
}
|
||||
|
||||
bpf_cgroup_release(kptr);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue