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selftests/bpf: Test changing packet data from kfunc #6057

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selftests/bpf: Test changing packet data from kfunc #6057

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14 changes: 14 additions & 0 deletions tools/testing/selftests/bpf/progs/verifier_sock.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1110,6 +1110,20 @@ int invalidate_xdp_pkt_pointers(struct xdp_md *x)
return XDP_PASS;
}

/* XDP packet changing kfunc calls invalidate packet pointers */
SEC("xdp")
__failure __msg("invalid mem access")
int invalidate_xdp_pkt_pointers(struct xdp_md *x)
{
int *p = (void *)(long)x->data;

if ((void *)(p + 1) > (void *)(long)x->data_end)
return XDP_DROP;
bpf_xdp_pull_data(x, 0);
*p = 42; /* this is unsafe */
return XDP_PASS;
}

__noinline
int tail_call(struct __sk_buff *sk)
{
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