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selftests/bpf: Add test to verify checking padding bytes for BPF syscall common attributes

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Add a test to verify that the tailing padding 4 bytes are checked in
syscall.c::__sys_bpf() using bpf_check_uarg_tail_zero().

Without the fix, the test fails with:

 test_common_attr_padding:FAIL:syscall unexpected syscall: actual 4 >= expected 0
 #213/12  map_create_failure/common_attr_padding:FAIL

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260518145446.6794-6-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Leon Hwang 2026-05-18 22:54:46 +08:00 committed by Alexei Starovoitov
parent 652f0c2c99
commit 7732ad2412
1 changed files with 26 additions and 0 deletions
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26
tools/testing/selftests/bpf/prog_tests/map_init.c
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@ -353,6 +353,30 @@ static void test_excl_prog_hash_size_2(void)
test_map_create_array(&opts, msg);
}
static void test_common_attr_padding(void)
{
struct bpf_common_attr_fake {
__u8 attrs[offsetofend(struct bpf_common_attr, log_true_size)];
__u32 pad;
} attr_common = {
.pad = 1,
};
union bpf_attr attr = {
.map_type = BPF_MAP_TYPE_ARRAY,
.key_size = 4,
.value_size = 4,
.max_entries = 1,
};
int fd;
fd = syscall(__NR_bpf, BPF_MAP_CREATE | BPF_COMMON_ATTRS, &attr, sizeof(attr), &attr_common,
sizeof(attr_common));
if (!ASSERT_LT(fd, 0, "syscall"))
close(fd);
else
ASSERT_EQ(errno, E2BIG, "errno");
}
void test_map_create_failure(void)
{
if (test__start_subtest("invalid_vmlinux_value_type_id_struct_ops"))
@ -377,4 +401,6 @@ void test_map_create_failure(void)
test_excl_prog_hash_size_1();
if (test__start_subtest("invalid_excl_prog_hash_size_2"))
test_excl_prog_hash_size_2();
if (test__start_subtest("common_attr_padding"))
test_common_attr_padding();
}