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bpf: selftests: Add selftests for module kfunc support

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This adds selftests that tests the success and failure path for modules
kfuncs (in presence of invalid kfunc calls) for both libbpf and
gen_loader. It also adds a prog_test kfunc_btf_id_list so that we can
add module BTF ID set from bpf_testmod.

This also introduces  a couple of test cases to verifier selftests for
validating whether we get an error or not depending on if invalid kfunc
call remains after elimination of unreachable instructions.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211002011757.311265-10-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi
2021-10-02 06:47:57 +05:30
committed by Alexei Starovoitov
parent 18f4fccbf3
commit c48e51c8b0
9 changed files with 132 additions and 31 deletions
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23
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
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@@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <linux/btf.h>
#include <linux/btf_ids.h>
#include <linux/error-injection.h>
#include <linux/init.h>
#include <linux/module.h>
@@ -13,6 +15,12 @@
DEFINE_PER_CPU(int, bpf_testmod_ksym_percpu) = 123;
noinline void
bpf_testmod_test_mod_kfunc(int i)
{
*(int *)this_cpu_ptr(&bpf_testmod_ksym_percpu) = i;
}
noinline int bpf_testmod_loop_test(int n)
{
int i, sum = 0;
@@ -71,13 +79,26 @@ static struct bin_attribute bin_attr_bpf_testmod_file __ro_after_init = {
.write = bpf_testmod_test_write,
};
BTF_SET_START(bpf_testmod_kfunc_ids)
BTF_ID(func, bpf_testmod_test_mod_kfunc)
BTF_SET_END(bpf_testmod_kfunc_ids)
static DEFINE_KFUNC_BTF_ID_SET(&bpf_testmod_kfunc_ids, bpf_testmod_kfunc_btf_set);
static int bpf_testmod_init(void)
{
return sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
int ret;
ret = sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
if (ret)
return ret;
register_kfunc_btf_id_set(&prog_test_kfunc_list, &bpf_testmod_kfunc_btf_set);
return 0;
}
static void bpf_testmod_exit(void)
{
unregister_kfunc_btf_id_set(&prog_test_kfunc_list, &bpf_testmod_kfunc_btf_set);
return sysfs_remove_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
}