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selftests/bpf: Add tests for exclusive maps

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Check if access is denied to another program for an exclusive map

Signed-off-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20250914215141.15144-6-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
KP Singh
2025-09-14 23:51:34 +02:00
committed by Alexei Starovoitov
parent 567010a547
commit 6c850cbca8
2 changed files with 88 additions and 0 deletions
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54
tools/testing/selftests/bpf/prog_tests/map_excl.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2025 Google LLC. */
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <test_progs.h>
#include <bpf/btf.h>
#include "map_excl.skel.h"
static void test_map_excl_allowed(void)
{
struct map_excl *skel = map_excl__open();
int err;
err = bpf_map__set_exclusive_program(skel->maps.excl_map, skel->progs.should_have_access);
if (!ASSERT_OK(err, "bpf_map__set_exclusive_program"))
goto out;
bpf_program__set_autoload(skel->progs.should_have_access, true);
bpf_program__set_autoload(skel->progs.should_not_have_access, false);
err = map_excl__load(skel);
ASSERT_OK(err, "map_excl__load");
out:
map_excl__destroy(skel);
}
static void test_map_excl_denied(void)
{
struct map_excl *skel = map_excl__open();
int err;
err = bpf_map__set_exclusive_program(skel->maps.excl_map, skel->progs.should_have_access);
if (!ASSERT_OK(err, "bpf_map__make_exclusive"))
goto out;
bpf_program__set_autoload(skel->progs.should_have_access, false);
bpf_program__set_autoload(skel->progs.should_not_have_access, true);
err = map_excl__load(skel);
ASSERT_EQ(err, -EACCES, "exclusive map access not denied\n");
out:
map_excl__destroy(skel);
}
void test_map_excl(void)
{
if (test__start_subtest("map_excl_allowed"))
test_map_excl_allowed();
if (test__start_subtest("map_excl_denied"))
test_map_excl_denied();
}

34
tools/testing/selftests/bpf/progs/map_excl.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2025 Google LLC. */
#include <linux/bpf.h>
#include <time.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, __u32);
__type(value, __u32);
__uint(max_entries, 1);
} excl_map SEC(".maps");
char _license[] SEC("license") = "GPL";
SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
int should_have_access(void *ctx)
{
int key = 0, value = 0xdeadbeef;
bpf_map_update_elem(&excl_map, &key, &value, 0);
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
int should_not_have_access(void *ctx)
{
int key = 0, value = 0xdeadbeef;
bpf_map_update_elem(&excl_map, &key, &value, 0);
return 0;
}