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linux/tools/testing/selftests/bpf/test_loader.c
Eduard Zingerman 63bb645b9d selftests/bpf: Add notion of auxiliary programs for test_loader 
In order to express test cases that use bpf_tail_call() intrinsic it
is necessary to have several programs to be loaded at a time.
This commit adds __auxiliary annotation to the set of annotations
supported by test_loader.c. Programs marked as auxiliary are always
loaded but are not treated as a separate test.

For example:

    void dummy_prog1(void);

    struct {
            __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
            __uint(max_entries, 4);
            __uint(key_size, sizeof(int));
            __array(values, void (void));
    } prog_map SEC(".maps") = {
            .values = {
                    [0] = (void *) &dummy_prog1,
            },
    };

    SEC("tc")
    __auxiliary
    __naked void dummy_prog1(void) {
            asm volatile ("r0 = 42; exit;");
    }

    SEC("tc")
    __description("reference tracking: check reference or tail call")
    __success __retval(0)
    __naked void check_reference_or_tail_call(void)
    {
            asm volatile (
            "r2 = %[prog_map] ll;"
            "r3 = 0;"
            "call %[bpf_tail_call];"
            "r0 = 0;"
            "exit;"
            :: __imm(bpf_tail_call),
            :  __clobber_all);
    }

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230421174234.2391278-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-04-21 12:16:56 -07:00

708 lines
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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include <linux/capability.h>
#include <stdlib.h>
#include <test_progs.h>
#include <bpf/btf.h>
#include "autoconf_helper.h"
#include "unpriv_helpers.h"
#include "cap_helpers.h"
#define str_has_pfx(str, pfx) \
(strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0)
#define TEST_LOADER_LOG_BUF_SZ 1048576
#define TEST_TAG_EXPECT_FAILURE "comment:test_expect_failure"
#define TEST_TAG_EXPECT_SUCCESS "comment:test_expect_success"
#define TEST_TAG_EXPECT_MSG_PFX "comment:test_expect_msg="
#define TEST_TAG_EXPECT_FAILURE_UNPRIV "comment:test_expect_failure_unpriv"
#define TEST_TAG_EXPECT_SUCCESS_UNPRIV "comment:test_expect_success_unpriv"
#define TEST_TAG_EXPECT_MSG_PFX_UNPRIV "comment:test_expect_msg_unpriv="
#define TEST_TAG_LOG_LEVEL_PFX "comment:test_log_level="
#define TEST_TAG_PROG_FLAGS_PFX "comment:test_prog_flags="
#define TEST_TAG_DESCRIPTION_PFX "comment:test_description="
#define TEST_TAG_RETVAL_PFX "comment:test_retval="
#define TEST_TAG_RETVAL_PFX_UNPRIV "comment:test_retval_unpriv="
#define TEST_TAG_AUXILIARY "comment:test_auxiliary"
#define TEST_TAG_AUXILIARY_UNPRIV "comment:test_auxiliary_unpriv"
/* Warning: duplicated in bpf_misc.h */
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
#define EFFICIENT_UNALIGNED_ACCESS 1
#else
#define EFFICIENT_UNALIGNED_ACCESS 0
#endif
static int sysctl_unpriv_disabled = -1;
enum mode {
PRIV = 1,
UNPRIV = 2
};
struct test_subspec {
char *name;
bool expect_failure;
const char **expect_msgs;
size_t expect_msg_cnt;
int retval;
bool execute;
};
struct test_spec {
const char *prog_name;
struct test_subspec priv;
struct test_subspec unpriv;
int log_level;
int prog_flags;
int mode_mask;
bool auxiliary;
bool valid;
};
static int tester_init(struct test_loader *tester)
{
if (!tester->log_buf) {
tester->log_buf_sz = TEST_LOADER_LOG_BUF_SZ;
tester->log_buf = malloc(tester->log_buf_sz);
if (!ASSERT_OK_PTR(tester->log_buf, "tester_log_buf"))
return -ENOMEM;
}
return 0;
}
void test_loader_fini(struct test_loader *tester)
{
if (!tester)
return;
free(tester->log_buf);
}
static void free_test_spec(struct test_spec *spec)
{
free(spec->priv.name);
free(spec->unpriv.name);
free(spec->priv.expect_msgs);
free(spec->unpriv.expect_msgs);
spec->priv.name = NULL;
spec->unpriv.name = NULL;
spec->priv.expect_msgs = NULL;
spec->unpriv.expect_msgs = NULL;
}
static int push_msg(const char *msg, struct test_subspec *subspec)
{
void *tmp;
tmp = realloc(subspec->expect_msgs, (1 + subspec->expect_msg_cnt) * sizeof(void *));
if (!tmp) {
ASSERT_FAIL("failed to realloc memory for messages\n");
return -ENOMEM;
}
subspec->expect_msgs = tmp;
subspec->expect_msgs[subspec->expect_msg_cnt++] = msg;
return 0;
}
static int parse_int(const char *str, int *val, const char *name)
{
char *end;
long tmp;
errno = 0;
if (str_has_pfx(str, "0x"))
tmp = strtol(str + 2, &end, 16);
else
tmp = strtol(str, &end, 10);
if (errno || end[0] != '\0') {
PRINT_FAIL("failed to parse %s from '%s'\n", name, str);
return -EINVAL;
}
*val = tmp;
return 0;
}
static int parse_retval(const char *str, int *val, const char *name)
{
struct {
char *name;
int val;
} named_values[] = {
{ "INT_MIN" , INT_MIN },
{ "POINTER_VALUE", POINTER_VALUE },
{ "TEST_DATA_LEN", TEST_DATA_LEN },
};
int i;
for (i = 0; i < ARRAY_SIZE(named_values); ++i) {
if (strcmp(str, named_values[i].name) != 0)
continue;
*val = named_values[i].val;
return 0;
}
return parse_int(str, val, name);
}
/* Uses btf_decl_tag attributes to describe the expected test
* behavior, see bpf_misc.h for detailed description of each attribute
* and attribute combinations.
*/
static int parse_test_spec(struct test_loader *tester,
struct bpf_object *obj,
struct bpf_program *prog,
struct test_spec *spec)
{
const char *description = NULL;
bool has_unpriv_result = false;
bool has_unpriv_retval = false;
int func_id, i, err = 0;
struct btf *btf;
memset(spec, 0, sizeof(*spec));
spec->prog_name = bpf_program__name(prog);
btf = bpf_object__btf(obj);
if (!btf) {
ASSERT_FAIL("BPF object has no BTF");
return -EINVAL;
}
func_id = btf__find_by_name_kind(btf, spec->prog_name, BTF_KIND_FUNC);
if (func_id < 0) {
ASSERT_FAIL("failed to find FUNC BTF type for '%s'", spec->prog_name);
return -EINVAL;
}
for (i = 1; i < btf__type_cnt(btf); i++) {
const char *s, *val, *msg;
const struct btf_type *t;
int tmp;
t = btf__type_by_id(btf, i);
if (!btf_is_decl_tag(t))
continue;
if (t->type != func_id || btf_decl_tag(t)->component_idx != -1)
continue;
s = btf__str_by_offset(btf, t->name_off);
if (str_has_pfx(s, TEST_TAG_DESCRIPTION_PFX)) {
description = s + sizeof(TEST_TAG_DESCRIPTION_PFX) - 1;
} else if (strcmp(s, TEST_TAG_EXPECT_FAILURE) == 0) {
spec->priv.expect_failure = true;
spec->mode_mask |= PRIV;
} else if (strcmp(s, TEST_TAG_EXPECT_SUCCESS) == 0) {
spec->priv.expect_failure = false;
spec->mode_mask |= PRIV;
} else if (strcmp(s, TEST_TAG_EXPECT_FAILURE_UNPRIV) == 0) {
spec->unpriv.expect_failure = true;
spec->mode_mask |= UNPRIV;
has_unpriv_result = true;
} else if (strcmp(s, TEST_TAG_EXPECT_SUCCESS_UNPRIV) == 0) {
spec->unpriv.expect_failure = false;
spec->mode_mask |= UNPRIV;
has_unpriv_result = true;
} else if (strcmp(s, TEST_TAG_AUXILIARY) == 0) {
spec->auxiliary = true;
spec->mode_mask |= PRIV;
} else if (strcmp(s, TEST_TAG_AUXILIARY_UNPRIV) == 0) {
spec->auxiliary = true;
spec->mode_mask |= UNPRIV;
} else if (str_has_pfx(s, TEST_TAG_EXPECT_MSG_PFX)) {
msg = s + sizeof(TEST_TAG_EXPECT_MSG_PFX) - 1;
err = push_msg(msg, &spec->priv);
if (err)
goto cleanup;
spec->mode_mask |= PRIV;
} else if (str_has_pfx(s, TEST_TAG_EXPECT_MSG_PFX_UNPRIV)) {
msg = s + sizeof(TEST_TAG_EXPECT_MSG_PFX_UNPRIV) - 1;
err = push_msg(msg, &spec->unpriv);
if (err)
goto cleanup;
spec->mode_mask |= UNPRIV;
} else if (str_has_pfx(s, TEST_TAG_RETVAL_PFX)) {
val = s + sizeof(TEST_TAG_RETVAL_PFX) - 1;
err = parse_retval(val, &spec->priv.retval, "__retval");
if (err)
goto cleanup;
spec->priv.execute = true;
spec->mode_mask |= PRIV;
} else if (str_has_pfx(s, TEST_TAG_RETVAL_PFX_UNPRIV)) {
val = s + sizeof(TEST_TAG_RETVAL_PFX_UNPRIV) - 1;
err = parse_retval(val, &spec->unpriv.retval, "__retval_unpriv");
if (err)
goto cleanup;
spec->mode_mask |= UNPRIV;
spec->unpriv.execute = true;
has_unpriv_retval = true;
} else if (str_has_pfx(s, TEST_TAG_LOG_LEVEL_PFX)) {
val = s + sizeof(TEST_TAG_LOG_LEVEL_PFX) - 1;
err = parse_int(val, &spec->log_level, "test log level");
if (err)
goto cleanup;
} else if (str_has_pfx(s, TEST_TAG_PROG_FLAGS_PFX)) {
val = s + sizeof(TEST_TAG_PROG_FLAGS_PFX) - 1;
if (strcmp(val, "BPF_F_STRICT_ALIGNMENT") == 0) {
spec->prog_flags |= BPF_F_STRICT_ALIGNMENT;
} else if (strcmp(val, "BPF_F_ANY_ALIGNMENT") == 0) {
spec->prog_flags |= BPF_F_ANY_ALIGNMENT;
} else if (strcmp(val, "BPF_F_TEST_RND_HI32") == 0) {
spec->prog_flags |= BPF_F_TEST_RND_HI32;
} else if (strcmp(val, "BPF_F_TEST_STATE_FREQ") == 0) {
spec->prog_flags |= BPF_F_TEST_STATE_FREQ;
} else if (strcmp(val, "BPF_F_SLEEPABLE") == 0) {
spec->prog_flags |= BPF_F_SLEEPABLE;
} else if (strcmp(val, "BPF_F_XDP_HAS_FRAGS") == 0) {
spec->prog_flags |= BPF_F_XDP_HAS_FRAGS;
} else /* assume numeric value */ {
err = parse_int(val, &tmp, "test prog flags");
if (err)
goto cleanup;
spec->prog_flags |= tmp;
}
}
}
if (spec->mode_mask == 0)
spec->mode_mask = PRIV;
if (!description)
description = spec->prog_name;
if (spec->mode_mask & PRIV) {
spec->priv.name = strdup(description);
if (!spec->priv.name) {
PRINT_FAIL("failed to allocate memory for priv.name\n");
err = -ENOMEM;
goto cleanup;
}
}
if (spec->mode_mask & UNPRIV) {
int descr_len = strlen(description);
const char *suffix = " @unpriv";
char *name;
name = malloc(descr_len + strlen(suffix) + 1);
if (!name) {
PRINT_FAIL("failed to allocate memory for unpriv.name\n");
err = -ENOMEM;
goto cleanup;
}
strcpy(name, description);
strcpy(&name[descr_len], suffix);
spec->unpriv.name = name;
}
if (spec->mode_mask & (PRIV | UNPRIV)) {
if (!has_unpriv_result)
spec->unpriv.expect_failure = spec->priv.expect_failure;
if (!has_unpriv_retval) {
spec->unpriv.retval = spec->priv.retval;
spec->unpriv.execute = spec->priv.execute;
}
if (!spec->unpriv.expect_msgs) {
size_t sz = spec->priv.expect_msg_cnt * sizeof(void *);
spec->unpriv.expect_msgs = malloc(sz);
if (!spec->unpriv.expect_msgs) {
PRINT_FAIL("failed to allocate memory for unpriv.expect_msgs\n");
err = -ENOMEM;
goto cleanup;
}
memcpy(spec->unpriv.expect_msgs, spec->priv.expect_msgs, sz);
spec->unpriv.expect_msg_cnt = spec->priv.expect_msg_cnt;
}
}
spec->valid = true;
return 0;
cleanup:
free_test_spec(spec);
return err;
}
static void prepare_case(struct test_loader *tester,
struct test_spec *spec,
struct bpf_object *obj,
struct bpf_program *prog)
{
int min_log_level = 0, prog_flags;
if (env.verbosity > VERBOSE_NONE)
min_log_level = 1;
if (env.verbosity > VERBOSE_VERY)
min_log_level = 2;
bpf_program__set_log_buf(prog, tester->log_buf, tester->log_buf_sz);
/* Make sure we set at least minimal log level, unless test requires
* even higher level already. Make sure to preserve independent log
* level 4 (verifier stats), though.
*/
if ((spec->log_level & 3) < min_log_level)
bpf_program__set_log_level(prog, (spec->log_level & 4) | min_log_level);
else
bpf_program__set_log_level(prog, spec->log_level);
prog_flags = bpf_program__flags(prog);
bpf_program__set_flags(prog, prog_flags | spec->prog_flags);
tester->log_buf[0] = '\0';
tester->next_match_pos = 0;
}
static void emit_verifier_log(const char *log_buf, bool force)
{
if (!force && env.verbosity == VERBOSE_NONE)
return;
fprintf(stdout, "VERIFIER LOG:\n=============\n%s=============\n", log_buf);
}
static void validate_case(struct test_loader *tester,
struct test_subspec *subspec,
struct bpf_object *obj,
struct bpf_program *prog,
int load_err)
{
int i, j;
for (i = 0; i < subspec->expect_msg_cnt; i++) {
char *match;
const char *expect_msg;
expect_msg = subspec->expect_msgs[i];
match = strstr(tester->log_buf + tester->next_match_pos, expect_msg);
if (!ASSERT_OK_PTR(match, "expect_msg")) {
/* if we are in verbose mode, we've already emitted log */
if (env.verbosity == VERBOSE_NONE)
emit_verifier_log(tester->log_buf, true /*force*/);
for (j = 0; j < i; j++)
fprintf(stderr,
"MATCHED MSG: '%s'\n", subspec->expect_msgs[j]);
fprintf(stderr, "EXPECTED MSG: '%s'\n", expect_msg);
return;
}
tester->next_match_pos = match - tester->log_buf + strlen(expect_msg);
}
}
struct cap_state {
__u64 old_caps;
bool initialized;
};
static int drop_capabilities(struct cap_state *caps)
{
const __u64 caps_to_drop = (1ULL << CAP_SYS_ADMIN | 1ULL << CAP_NET_ADMIN |
1ULL << CAP_PERFMON | 1ULL << CAP_BPF);
int err;
err = cap_disable_effective(caps_to_drop, &caps->old_caps);
if (err) {
PRINT_FAIL("failed to drop capabilities: %i, %s\n", err, strerror(err));
return err;
}
caps->initialized = true;
return 0;
}
static int restore_capabilities(struct cap_state *caps)
{
int err;
if (!caps->initialized)
return 0;
err = cap_enable_effective(caps->old_caps, NULL);
if (err)
PRINT_FAIL("failed to restore capabilities: %i, %s\n", err, strerror(err));
caps->initialized = false;
return err;
}
static bool can_execute_unpriv(struct test_loader *tester, struct test_spec *spec)
{
if (sysctl_unpriv_disabled < 0)
sysctl_unpriv_disabled = get_unpriv_disabled() ? 1 : 0;
if (sysctl_unpriv_disabled)
return false;
if ((spec->prog_flags & BPF_F_ANY_ALIGNMENT) && !EFFICIENT_UNALIGNED_ACCESS)
return false;
return true;
}
static bool is_unpriv_capable_map(struct bpf_map *map)
{
enum bpf_map_type type;
__u32 flags;
type = bpf_map__type(map);
switch (type) {
case BPF_MAP_TYPE_HASH:
case BPF_MAP_TYPE_PERCPU_HASH:
case BPF_MAP_TYPE_HASH_OF_MAPS:
flags = bpf_map__map_flags(map);
return !(flags & BPF_F_ZERO_SEED);
case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
case BPF_MAP_TYPE_ARRAY:
case BPF_MAP_TYPE_RINGBUF:
case BPF_MAP_TYPE_PROG_ARRAY:
case BPF_MAP_TYPE_CGROUP_ARRAY:
case BPF_MAP_TYPE_PERCPU_ARRAY:
case BPF_MAP_TYPE_USER_RINGBUF:
case BPF_MAP_TYPE_ARRAY_OF_MAPS:
case BPF_MAP_TYPE_CGROUP_STORAGE:
case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
return true;
default:
return false;
}
}
static int do_prog_test_run(int fd_prog, int *retval)
{
__u8 tmp_out[TEST_DATA_LEN << 2] = {};
__u8 tmp_in[TEST_DATA_LEN] = {};
int err, saved_errno;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = tmp_in,
.data_size_in = sizeof(tmp_in),
.data_out = tmp_out,
.data_size_out = sizeof(tmp_out),
.repeat = 1,
);
err = bpf_prog_test_run_opts(fd_prog, &topts);
saved_errno = errno;
if (err) {
PRINT_FAIL("FAIL: Unexpected bpf_prog_test_run error: %d (%s) ",
saved_errno, strerror(saved_errno));
return err;
}
ASSERT_OK(0, "bpf_prog_test_run");
*retval = topts.retval;
return 0;
}
static bool should_do_test_run(struct test_spec *spec, struct test_subspec *subspec)
{
if (!subspec->execute)
return false;
if (subspec->expect_failure)
return false;
if ((spec->prog_flags & BPF_F_ANY_ALIGNMENT) && !EFFICIENT_UNALIGNED_ACCESS) {
if (env.verbosity != VERBOSE_NONE)
printf("alignment prevents execution\n");
return false;
}
return true;
}
/* this function is forced noinline and has short generic name to look better
* in test_progs output (in case of a failure)
*/
static noinline
void run_subtest(struct test_loader *tester,
struct bpf_object_open_opts *open_opts,
const void *obj_bytes,
size_t obj_byte_cnt,
struct test_spec *specs,
struct test_spec *spec,
bool unpriv)
{
struct test_subspec *subspec = unpriv ? &spec->unpriv : &spec->priv;
struct bpf_program *tprog, *tprog_iter;
struct test_spec *spec_iter;
struct cap_state caps = {};
struct bpf_object *tobj;
struct bpf_map *map;
int retval, err, i;
bool should_load;
if (!test__start_subtest(subspec->name))
return;
if (unpriv) {
if (!can_execute_unpriv(tester, spec)) {
test__skip();
test__end_subtest();
return;
}
if (drop_capabilities(&caps)) {
test__end_subtest();
return;
}
}
tobj = bpf_object__open_mem(obj_bytes, obj_byte_cnt, open_opts);
if (!ASSERT_OK_PTR(tobj, "obj_open_mem")) /* shouldn't happen */
goto subtest_cleanup;
i = 0;
bpf_object__for_each_program(tprog_iter, tobj) {
spec_iter = &specs[i++];
should_load = false;
if (spec_iter->valid) {
if (strcmp(bpf_program__name(tprog_iter), spec->prog_name) == 0) {
tprog = tprog_iter;
should_load = true;
}
if (spec_iter->auxiliary &&
spec_iter->mode_mask & (unpriv ? UNPRIV : PRIV))
should_load = true;
}
bpf_program__set_autoload(tprog_iter, should_load);
}
prepare_case(tester, spec, tobj, tprog);
/* By default bpf_object__load() automatically creates all
* maps declared in the skeleton. Some map types are only
* allowed in priv mode. Disable autoload for such maps in
* unpriv mode.
*/
bpf_object__for_each_map(map, tobj)
bpf_map__set_autocreate(map, !unpriv || is_unpriv_capable_map(map));
err = bpf_object__load(tobj);
if (subspec->expect_failure) {
if (!ASSERT_ERR(err, "unexpected_load_success")) {
emit_verifier_log(tester->log_buf, false /*force*/);
goto tobj_cleanup;
}
} else {
if (!ASSERT_OK(err, "unexpected_load_failure")) {
emit_verifier_log(tester->log_buf, true /*force*/);
goto tobj_cleanup;
}
}
emit_verifier_log(tester->log_buf, false /*force*/);
validate_case(tester, subspec, tobj, tprog, err);
if (should_do_test_run(spec, subspec)) {
/* For some reason test_verifier executes programs
* with all capabilities restored. Do the same here.
*/
if (restore_capabilities(&caps))
goto tobj_cleanup;
if (tester->pre_execution_cb) {
err = tester->pre_execution_cb(tobj);
if (err) {
PRINT_FAIL("pre_execution_cb failed: %d\n", err);
goto tobj_cleanup;
}
}
do_prog_test_run(bpf_program__fd(tprog), &retval);
if (retval != subspec->retval && subspec->retval != POINTER_VALUE) {
PRINT_FAIL("Unexpected retval: %d != %d\n", retval, subspec->retval);
goto tobj_cleanup;
}
}
tobj_cleanup:
bpf_object__close(tobj);
subtest_cleanup:
test__end_subtest();
restore_capabilities(&caps);
}
static void process_subtest(struct test_loader *tester,
const char *skel_name,
skel_elf_bytes_fn elf_bytes_factory)
{
LIBBPF_OPTS(bpf_object_open_opts, open_opts, .object_name = skel_name);
struct test_spec *specs = NULL;
struct bpf_object *obj = NULL;
struct bpf_program *prog;
const void *obj_bytes;
int err, i, nr_progs;
size_t obj_byte_cnt;
if (tester_init(tester) < 0)
return; /* failed to initialize tester */
obj_bytes = elf_bytes_factory(&obj_byte_cnt);
obj = bpf_object__open_mem(obj_bytes, obj_byte_cnt, &open_opts);
if (!ASSERT_OK_PTR(obj, "obj_open_mem"))
return;
nr_progs = 0;
bpf_object__for_each_program(prog, obj)
++nr_progs;
specs = calloc(nr_progs, sizeof(struct test_spec));
if (!ASSERT_OK_PTR(specs, "Can't alloc specs array"))
return;
i = 0;
bpf_object__for_each_program(prog, obj) {
/* ignore tests for which we can't derive test specification */
err = parse_test_spec(tester, obj, prog, &specs[i++]);
if (err)
PRINT_FAIL("Can't parse test spec for program '%s'\n",
bpf_program__name(prog));
}
i = 0;
bpf_object__for_each_program(prog, obj) {
struct test_spec *spec = &specs[i++];
if (!spec->valid || spec->auxiliary)
continue;
if (spec->mode_mask & PRIV)
run_subtest(tester, &open_opts, obj_bytes, obj_byte_cnt,
specs, spec, false);
if (spec->mode_mask & UNPRIV)
run_subtest(tester, &open_opts, obj_bytes, obj_byte_cnt,
specs, spec, true);
}
for (i = 0; i < nr_progs; ++i)
free_test_spec(&specs[i]);
free(specs);
bpf_object__close(obj);
}
void test_loader__run_subtests(struct test_loader *tester,
const char *skel_name,
skel_elf_bytes_fn elf_bytes_factory)
{
/* see comment in run_subtest() for why we do this function nesting */
process_subtest(tester, skel_name, elf_bytes_factory);
}
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