f0aec6c403
commit 4237e9f4a96228ccc8a7abe5e4b30834323cd353 upstream. Add a test to check that the verifier is able to recognize spilling of PTR_TO_MEM registers, by reserving a ringbuf buffer, forcing the spill of a pointer holding the buffer address to the stack, filling it back in from the stack and writing to the memory area pointed by it. The patch was partially contributed by CyberArk Software, Inc. Signed-off-by: Gilad Reti <gilad.reti@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: KP Singh <kpsingh@kernel.org> Link: https://lore.kernel.org/bpf/20210113053810.13518-2-gilad.reti@gmail.com Cc: Lorenz Bauer <lmb@isovalent.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>