From: Martin KaFai Lau <martin.lau@xxxxxxxxxx> This patch tests the map creation failure when the map_value has unsupported uptr. The three cases are the struct is larger than one page, the struct is empty, and the struct is a kernel struct. Signed-off-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx> --- .../bpf/prog_tests/task_local_storage.c | 46 +++++++++++++++++++ .../selftests/bpf/progs/uptr_map_failure.c | 27 +++++++++++ tools/testing/selftests/bpf/test_progs.h | 8 ++++ .../testing/selftests/bpf/uptr_test_common.h | 23 ++++++++++ 4 files changed, 104 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uptr_map_failure.c diff --git a/tools/testing/selftests/bpf/prog_tests/task_local_storage.c b/tools/testing/selftests/bpf/prog_tests/task_local_storage.c index 772ed7ce4feb..00cc9d0aee5d 100644 --- a/tools/testing/selftests/bpf/prog_tests/task_local_storage.c +++ b/tools/testing/selftests/bpf/prog_tests/task_local_storage.c @@ -10,6 +10,7 @@ #include <sys/eventfd.h> #include <sys/mman.h> #include <test_progs.h> +#include <bpf/btf.h> #include "task_local_storage_helpers.h" #include "task_local_storage.skel.h" #include "task_local_storage_exit_creds.skel.h" @@ -19,6 +20,7 @@ #include "task_ls_uptr.skel.h" #include "uptr_update_failure.skel.h" #include "uptr_failure.skel.h" +#include "uptr_map_failure.skel.h" static void test_sys_enter_exit(void) { @@ -452,6 +454,40 @@ static void test_uptr_update_failure(void) close(task_fd); } +static void test_uptr_map_failure(const char *map_name, int expected_errno) +{ + LIBBPF_OPTS(bpf_map_create_opts, create_attr); + struct uptr_map_failure *skel; + struct bpf_map *map; + struct btf *btf; + int map_fd, err; + + skel = uptr_map_failure__open(); + if (!ASSERT_OK_PTR(skel, "uptr_map_failure__open")) + return; + + map = bpf_object__find_map_by_name(skel->obj, map_name); + btf = bpf_object__btf(skel->obj); + err = btf__load_into_kernel(btf); + if (!ASSERT_OK(err, "btf__load_into_kernel")) + goto done; + + create_attr.map_flags = bpf_map__map_flags(map); + create_attr.btf_fd = btf__fd(btf); + create_attr.btf_key_type_id = bpf_map__btf_key_type_id(map); + create_attr.btf_value_type_id = bpf_map__btf_value_type_id(map); + map_fd = bpf_map_create(bpf_map__type(map), map_name, + bpf_map__key_size(map), bpf_map__value_size(map), + 0, &create_attr); + if (ASSERT_ERR_FD(map_fd, "map_create")) + ASSERT_EQ(errno, expected_errno, "errno"); + else + close(map_fd); + +done: + uptr_map_failure__destroy(skel); +} + void test_task_local_storage(void) { if (test__start_subtest("sys_enter_exit")) @@ -468,5 +504,15 @@ void test_task_local_storage(void) test_uptr_across_pages(); if (test__start_subtest("uptr_update_failure")) test_uptr_update_failure(); + if (test__start_subtest("uptr_map_failure_e2big")) { + if (getpagesize() == PAGE_SIZE) + test_uptr_map_failure("large_uptr_map", E2BIG); + else + test__skip(); + } + if (test__start_subtest("uptr_map_failure_size0")) + test_uptr_map_failure("empty_uptr_map", EINVAL); + if (test__start_subtest("uptr_map_failure_kstruct")) + test_uptr_map_failure("kstruct_uptr_map", EINVAL); RUN_TESTS(uptr_failure); } diff --git a/tools/testing/selftests/bpf/progs/uptr_map_failure.c b/tools/testing/selftests/bpf/progs/uptr_map_failure.c new file mode 100644 index 000000000000..417b763d76b4 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uptr_map_failure.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ + +#include <vmlinux.h> +#include <bpf/bpf_helpers.h> +#include "uptr_test_common.h" + +struct { + __uint(type, BPF_MAP_TYPE_TASK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct large_uptr); +} large_uptr_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_TASK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct empty_uptr); +} empty_uptr_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_TASK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct kstruct_uptr); +} kstruct_uptr_map SEC(".maps"); diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h index 7767d9a825ae..7a58895867c3 100644 --- a/tools/testing/selftests/bpf/test_progs.h +++ b/tools/testing/selftests/bpf/test_progs.h @@ -390,6 +390,14 @@ int test__join_cgroup(const char *path); ___ok; \ }) +#define ASSERT_ERR_FD(fd, name) ({ \ + static int duration = 0; \ + int ___fd = (fd); \ + bool ___ok = ___fd < 0; \ + CHECK(!___ok, (name), "unexpected fd: %d\n", ___fd); \ + ___ok; \ +}) + #define SYS(goto_label, fmt, ...) \ ({ \ char cmd[1024]; \ diff --git a/tools/testing/selftests/bpf/uptr_test_common.h b/tools/testing/selftests/bpf/uptr_test_common.h index 45c00c80d935..f8a134ba12f9 100644 --- a/tools/testing/selftests/bpf/uptr_test_common.h +++ b/tools/testing/selftests/bpf/uptr_test_common.h @@ -5,9 +5,12 @@ #define _UPTR_TEST_COMMON_H #define MAGIC_VALUE 0xabcd1234 +#define PAGE_SIZE 4096 #ifdef __BPF__ /* Avoid fwd btf type being generated for the following struct */ +struct large_data *dummy_large_data; +struct empty_data *dummy_empty_data; struct user_data *dummy_data; struct cgroup *dummy_cgrp; #else @@ -37,4 +40,24 @@ struct value_lock_type { struct bpf_spin_lock lock; }; +struct large_data { + __u8 one_page[PAGE_SIZE]; + int a; +}; + +struct large_uptr { + struct large_data __uptr *udata; +}; + +struct empty_data { +}; + +struct empty_uptr { + struct empty_data __uptr *udata; +}; + +struct kstruct_uptr { + struct cgroup __uptr *cgrp; +}; + #endif -- 2.43.5