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selftests/bpf: Test for syscall program type 

bpf_prog_type_syscall is a program that creates a bpf map,
updates it, and loads another bpf program using bpf_sys_bpf() helper.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-6-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:07 -07:00 committed by Daniel Borkmann
parent 5452fc9a17
commit 00899e7e8d
2 changed files with 123 additions and 0 deletions
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52
tools/testing/selftests/bpf/prog_tests/syscall.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include "syscall.skel.h"
struct args {
__u64 log_buf;
__u32 log_size;
int max_entries;
int map_fd;
int prog_fd;
};
void test_syscall(void)
{
static char verifier_log[8192];
struct args ctx = {
.max_entries = 1024,
.log_buf = (uintptr_t) verifier_log,
.log_size = sizeof(verifier_log),
};
struct bpf_prog_test_run_attr tattr = {
.ctx_in = &ctx,
.ctx_size_in = sizeof(ctx),
};
struct syscall *skel = NULL;
__u64 key = 12, value = 0;
int err;
skel = syscall__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_load"))
goto cleanup;
tattr.prog_fd = bpf_program__fd(skel->progs.bpf_prog);
err = bpf_prog_test_run_xattr(&tattr);
ASSERT_EQ(err, 0, "err");
ASSERT_EQ(tattr.retval, 1, "retval");
ASSERT_GT(ctx.map_fd, 0, "ctx.map_fd");
ASSERT_GT(ctx.prog_fd, 0, "ctx.prog_fd");
ASSERT_OK(memcmp(verifier_log, "processed", sizeof("processed") - 1),
"verifier_log");
err = bpf_map_lookup_elem(ctx.map_fd, &key, &value);
ASSERT_EQ(err, 0, "map_lookup");
ASSERT_EQ(value, 34, "map lookup value");
cleanup:
syscall__destroy(skel);
if (ctx.prog_fd > 0)
close(ctx.prog_fd);
if (ctx.map_fd > 0)
close(ctx.map_fd);
}

71
tools/testing/selftests/bpf/progs/syscall.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <../../../tools/include/linux/filter.h>
char _license[] SEC("license") = "GPL";
struct args {
__u64 log_buf;
__u32 log_size;
int max_entries;
int map_fd;
int prog_fd;
};
SEC("syscall")
int bpf_prog(struct args *ctx)
{
static char license[] = "GPL";
static struct bpf_insn insns[] = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
static union bpf_attr map_create_attr = {
.map_type = BPF_MAP_TYPE_HASH,
.key_size = 8,
.value_size = 8,
};
static union bpf_attr map_update_attr = { .map_fd = 1, };
static __u64 key = 12;
static __u64 value = 34;
static union bpf_attr prog_load_attr = {
.prog_type = BPF_PROG_TYPE_XDP,
.insn_cnt = sizeof(insns) / sizeof(insns[0]),
};
int ret;
map_create_attr.max_entries = ctx->max_entries;
prog_load_attr.license = (long) license;
prog_load_attr.insns = (long) insns;
prog_load_attr.log_buf = ctx->log_buf;
prog_load_attr.log_size = ctx->log_size;
prog_load_attr.log_level = 1;
ret = bpf_sys_bpf(BPF_MAP_CREATE, &map_create_attr, sizeof(map_create_attr));
if (ret <= 0)
return ret;
ctx->map_fd = ret;
insns[3].imm = ret;
map_update_attr.map_fd = ret;
map_update_attr.key = (long) &key;
map_update_attr.value = (long) &value;
ret = bpf_sys_bpf(BPF_MAP_UPDATE_ELEM, &map_update_attr, sizeof(map_update_attr));
if (ret < 0)
return ret;
ret = bpf_sys_bpf(BPF_PROG_LOAD, &prog_load_attr, sizeof(prog_load_attr));
if (ret <= 0)
return ret;
ctx->prog_fd = ret;
return 1;
}