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selftest/bpf: Check invalid length in test_xdp_update_frags 

Update test_xdp_update_frags adding a test for a buffer size
set to (MAX_SKB_FRAGS + 2) * PAGE_SIZE. The kernel is supposed
to return -ENOMEM.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/3e4afa0ee4976854b2f0296998fe6754a80b62e5.1644366736.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2022-02-09 01:35:12 +01:00 committed by Alexei Starovoitov
parent 85fbd23303
commit a5a358abbc
1 changed files with 37 additions and 1 deletions
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38
tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
View File

@ -5,11 +5,12 @@
static void test_xdp_update_frags(void)
{
const char *file = "./test_xdp_update_frags.o";
int err, prog_fd, max_skb_frags, buf_size, num;
struct bpf_program *prog;
struct bpf_object *obj;
int err, prog_fd;
__u32 *offset;
__u8 *buf;
FILE *f;
LIBBPF_OPTS(bpf_test_run_opts, topts);
obj = bpf_object__open(file);
@ -99,6 +100,41 @@ static void test_xdp_update_frags(void)
ASSERT_EQ(buf[7621], 0xbb, "xdp_update_frag buf[7621]");
free(buf);
/* test_xdp_update_frags: unsupported buffer size */
f = fopen("/proc/sys/net/core/max_skb_frags", "r");
if (!ASSERT_OK_PTR(f, "max_skb_frag file pointer"))
goto out;
num = fscanf(f, "%d", &max_skb_frags);
fclose(f);
if (!ASSERT_EQ(num, 1, "max_skb_frags read failed"))
goto out;
/* xdp_buff linear area size is always set to 4096 in the
* bpf_prog_test_run_xdp routine.
*/
buf_size = 4096 + (max_skb_frags + 1) * sysconf(_SC_PAGE_SIZE);
buf = malloc(buf_size);
if (!ASSERT_OK_PTR(buf, "alloc buf"))
goto out;
memset(buf, 0, buf_size);
offset = (__u32 *)buf;
*offset = 16;
buf[*offset] = 0xaa;
buf[*offset + 15] = 0xaa;
topts.data_in = buf;
topts.data_out = buf;
topts.data_size_in = buf_size;
topts.data_size_out = buf_size;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_EQ(err, -ENOMEM,
"unsupported buf size, possible non-default /proc/sys/net/core/max_skb_flags?");
free(buf);
out:
bpf_object__close(obj);
}