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selftests/bpf: Check overflow in optional buffer

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This ensures we still reject invalid memory accesses in buffers that are
marked optional.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20230506013134.2492210-4-drosen@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Rosenberg 2023-05-05 18:31:32 -07:00 committed by Alexei Starovoitov
parent 1ce33b6c84
commit 3881fdfed2
1 changed files with 20 additions and 0 deletions
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20
tools/testing/selftests/bpf/progs/dynptr_fail.c
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@ -1665,3 +1665,23 @@ int clone_xdp_packet_data(struct xdp_md *xdp)
return 0;
}
/* Buffers that are provided must be sufficiently long */
SEC("?cgroup_skb/egress")
__failure __msg("memory, len pair leads to invalid memory access")
int test_dynptr_skb_small_buff(struct __sk_buff *skb)
{
struct bpf_dynptr ptr;
char buffer[8] = {};
__u64 *data;
if (bpf_dynptr_from_skb(skb, 0, &ptr)) {
err = 1;
return 1;
}
/* This may return NULL. SKB may require a buffer */
data = bpf_dynptr_slice(&ptr, 0, buffer, 9);
return !!data;
}