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selftests/bpf: Add tests to verify checking padding bytes for bpf_[map,prog]_info

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Add two tests to verify that the tail padding 4 bytes of struct
bpf_map_info and bpf_prog_info are checked in syscall.c using
bpf_check_uarg_tail_zero().

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260605155249.20772-4-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Leon Hwang 2026-06-05 23:52:49 +08:00 committed by Alexei Starovoitov
parent 786be2b059
commit d47e67a487
1 changed files with 55 additions and 0 deletions
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55
tools/testing/selftests/bpf/prog_tests/bpf_attr_size.c
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@ -62,8 +62,63 @@ static void test_query_size_boundaries(void)
cgroup_skb_direct_packet_access__destroy(skel);
}
static void test_map_info_tail_zero(void)
{
LIBBPF_OPTS(bpf_map_create_opts, map_opts);
struct bpf_map_info_fake {
__u8 info[offsetofend(struct bpf_map_info, hash_size)];
__u32 pad;
} info = {
.pad = 1,
};
int map_fd, err;
__u32 info_len;
map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr", sizeof(int), 1, 1, &map_opts);
if (!ASSERT_GE(map_fd, 0, "bpf_map_create"))
return;
info_len = sizeof(info);
err = bpf_obj_get_info_by_fd(map_fd, &info, &info_len);
ASSERT_EQ(err, -E2BIG, "bpf_obj_get_info_by_fd");
close(map_fd);
}
static void test_prog_info_tail_zero(void)
{
LIBBPF_OPTS(bpf_prog_load_opts, prog_opts);
struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
struct bpf_prog_info_fake {
__u8 info[offsetofend(struct bpf_prog_info, attach_btf_id)];
__u32 pad;
} info = {
.pad = 1,
};
int prog_fd, err;
__u32 info_len;
prog_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, "test_prog", "GPL", insns,
ARRAY_SIZE(insns), &prog_opts);
if (!ASSERT_GE(prog_fd, 0, "bpf_prog_load"))
return;
info_len = sizeof(info);
err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
ASSERT_EQ(err, -E2BIG, "bpf_obj_get_info_by_fd");
close(prog_fd);
}
void test_bpf_attr_size(void)
{
if (test__start_subtest("query_size_boundaries"))
test_query_size_boundaries();
if (test__start_subtest("map_info_tail_zero"))
test_map_info_tail_zero();
if (test__start_subtest("prog_info_tail_zero"))
test_prog_info_tail_zero();
}