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author | Pu Lehui <pulehui@huawei.com> | 2022-12-06 10:14:10 +0100 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-12-06 20:59:27 +0100 |
commit | b54b6003612a376e7be32cbc5c1af3754bbbbb3d (patch) | |
tree | 3cb3717d8eddc2998c515cd0630aedc140e95e60 /tools/bpf | |
parent | Merge branch 'xfrm: interface: Add unstable helpers for XFRM metadata' (diff) | |
download | linux-b54b6003612a376e7be32cbc5c1af3754bbbbb3d.tar.xz linux-b54b6003612a376e7be32cbc5c1af3754bbbbb3d.zip |
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
Diffstat (limited to 'tools/bpf')
0 files changed, 0 insertions, 0 deletions