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authorPu Lehui <pulehui@huawei.com>2022-12-06 10:14:10 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2022-12-06 20:59:27 +0100
commitb54b6003612a376e7be32cbc5c1af3754bbbbb3d (patch)
tree3cb3717d8eddc2998c515cd0630aedc140e95e60 /tools/bpf
parentMerge branch 'xfrm: interface: Add unstable helpers for XFRM metadata' (diff)
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riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC
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: 69c087ba6225 ("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
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