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[ Upstream commitb54b600361] For BPF_PSEUDO_FUNC instruction, verifier will refill imm with correct addresses of bpf_calls and then run last pass of JIT. Since the emit_imm of RV64 is variable-length, which will emit appropriate length instructions accorroding to the imm, it may broke ctx->offset, and lead to unpredictable problem, such as inaccurate jump. So let's fix it with fixed-length instructions. Fixes:69c087ba62("bpf: Add bpf_for_each_map_elem() helper") Suggested-by: Björn Töpel <bjorn@rivosinc.com> Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Björn Töpel <bjorn@kernel.org> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/bpf/20221206091410.1584784-1-pulehui@huaweicloud.com Signed-off-by: Sasha Levin <sashal@kernel.org>