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commit744ea4e388upstream. Add support for pointer to mem register spilling, to allow the verifier to track pointers to valid memory addresses. Such pointers are returned for example by a successful call of the bpf_ringbuf_reserve helper. The patch was partially contributed by CyberArk Software, Inc. Fixes:457f44363a("bpf: Implement BPF ring buffer and verifier support for it") Suggested-by: Yonghong Song <yhs@fb.com> Signed-off-by: Gilad Reti <gilad.reti@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: KP Singh <kpsingh@kernel.org> Link: https://lore.kernel.org/bpf/20210113053810.13518-1-gilad.reti@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>