[RFC PATCH bpf-next v1 01/14] MIPS: eBPF: support BPF_TAIL_CALL in JIT static analysis
From: Tony Ambardar <hidden>
Date: 2021-07-12 00:35:40
Also in:
bpf, linux-mips
Subsystem:
bpf jit for mips (32-bit and 64-bit), bpf [general] (safe dynamic programs and tools), mips, the rest · Maintainers:
Johan Almbladh, Paul Burton, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Thomas Bogendoerfer, Linus Torvalds
Add support in reg_val_propagate_range() for BPF_TAIL_CALL, fixing many
kernel log WARNINGs ("Unhandled BPF_JMP case") seen during JIT testing.
Treat BPF_TAIL_CALL like a NOP, falling through as if the tail call failed.
Fixes: b6bd53f9c4e8 ("MIPS: Add missing file for eBPF JIT.")
Signed-off-by: Tony Ambardar <redacted>
---
arch/mips/net/ebpf_jit.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/mips/net/ebpf_jit.c b/arch/mips/net/ebpf_jit.c
index 939dd06764bc..ed47a10d533f 100644
--- a/arch/mips/net/ebpf_jit.c
+++ b/arch/mips/net/ebpf_jit.c@@ -1714,6 +1714,9 @@ static int reg_val_propagate_range(struct jit_ctx *ctx, u64 initial_rvt, for (reg = BPF_REG_0; reg <= BPF_REG_5; reg++) set_reg_val_type(&exit_rvt, reg, REG_64BIT); + rvt[idx] |= RVT_DONE; + break; + case BPF_TAIL_CALL: rvt[idx] |= RVT_DONE; break; default:
--
2.25.1