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selftests/bpf: Mix legacy (maps) and modern (vars) BPF in one test

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Add selftest that combines two BPF programs within single BPF object
file such that one of the programs is using global variables, but can be
skipped at runtime on old kernels that don't support global data.
Another BPF program is written with the goal to be runnable on very old
kernels and only relies on explicitly accessed BPF maps.

Such test, run against old kernels (e.g., libbpf CI will run it against 4.9
kernel that doesn't support global data), allows to test the approach
and ensure that libbpf doesn't make unnecessary assumption about
necessary kernel features.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211123200105.387855-2-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-11-23 12:01:05 -08:00 committed by Daniel Borkmann
parent 16e0c35c6f
commit e4f7ac90c2
2 changed files with 138 additions and 0 deletions
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65
tools/testing/selftests/bpf/prog_tests/legacy_printk.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include "test_legacy_printk.skel.h"
static int execute_one_variant(bool legacy)
{
struct test_legacy_printk *skel;
int err, zero = 0, my_pid = getpid(), res, map_fd;
skel = test_legacy_printk__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return -errno;
bpf_program__set_autoload(skel->progs.handle_legacy, legacy);
bpf_program__set_autoload(skel->progs.handle_modern, !legacy);
err = test_legacy_printk__load(skel);
/* no ASSERT_OK, we expect one of two variants can fail here */
if (err)
goto err_out;
if (legacy) {
map_fd = bpf_map__fd(skel->maps.my_pid_map);
err = bpf_map_update_elem(map_fd, &zero, &my_pid, BPF_ANY);
if (!ASSERT_OK(err, "my_pid_map_update"))
goto err_out;
err = bpf_map_lookup_elem(map_fd, &zero, &res);
} else {
skel->bss->my_pid_var = my_pid;
}
err = test_legacy_printk__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto err_out;
usleep(1); /* trigger */
if (legacy) {
map_fd = bpf_map__fd(skel->maps.res_map);
err = bpf_map_lookup_elem(map_fd, &zero, &res);
if (!ASSERT_OK(err, "res_map_lookup"))
goto err_out;
} else {
res = skel->bss->res_var;
}
if (!ASSERT_GT(res, 0, "res")) {
err = -EINVAL;
goto err_out;
}
err_out:
test_legacy_printk__destroy(skel);
return err;
}
void test_legacy_printk(void)
{
/* legacy variant should work everywhere */
ASSERT_OK(execute_one_variant(true /* legacy */), "legacy_case");
/* execute modern variant, can fail the load on old kernels */
execute_one_variant(false);
}

73
tools/testing/selftests/bpf/progs/test_legacy_printk.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <linux/bpf.h>
#define BPF_NO_GLOBAL_DATA
#include <bpf/bpf_helpers.h>
char LICENSE[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, int);
__uint(max_entries, 1);
} my_pid_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, int);
__uint(max_entries, 1);
} res_map SEC(".maps");
volatile int my_pid_var = 0;
volatile int res_var = 0;
SEC("tp/raw_syscalls/sys_enter")
int handle_legacy(void *ctx)
{
int zero = 0, *my_pid, cur_pid, *my_res;
my_pid = bpf_map_lookup_elem(&my_pid_map, &zero);
if (!my_pid)
return 1;
cur_pid = bpf_get_current_pid_tgid() >> 32;
if (cur_pid != *my_pid)
return 1;
my_res = bpf_map_lookup_elem(&res_map, &zero);
if (!my_res)
return 1;
if (*my_res == 0)
/* use bpf_printk() in combination with BPF_NO_GLOBAL_DATA to
* force .rodata.str1.1 section that previously caused
* problems on old kernels due to libbpf always tried to
* create a global data map for it
*/
bpf_printk("Legacy-case bpf_printk test, pid %d\n", cur_pid);
*my_res = 1;
return *my_res;
}
SEC("tp/raw_syscalls/sys_enter")
int handle_modern(void *ctx)
{
int zero = 0, cur_pid;
cur_pid = bpf_get_current_pid_tgid() >> 32;
if (cur_pid != my_pid_var)
return 1;
if (res_var == 0)
/* we need bpf_printk() to validate libbpf logic around unused
* global maps and legacy kernels; see comment in handle_legacy()
*/
bpf_printk("Modern-case bpf_printk test, pid %d\n", cur_pid);
res_var = 1;
return res_var;
}