bpf, selftests: Add various ringbuf tests with invalid offset

mainline inclusion
from mainline-v5.17-rc1
commit 722e4db3
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4WT90
CVE: CVE-2021-4204

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=722e4db3ae0d52b2e3801280afbe19cf2d188e91



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Assert that the verifier is rejecting invalid offsets on the ringbuf entries:

  # ./test_verifier | grep ring
  #947/u ringbuf: invalid reservation offset 1 OK
  #947/p ringbuf: invalid reservation offset 1 OK
  #948/u ringbuf: invalid reservation offset 2 OK
  #948/p ringbuf: invalid reservation offset 2 OK

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>