linux-kernel - [PATCH riscv-next] riscv: bpf: Fix eBPF's exception tables

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Message-Id: <20220110165208.1826-1-jszhang@kernel.org>
Date:   Tue, 11 Jan 2022 00:52:08 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Björn Töpel <bjorn@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tong Tiangen <tongtiangen@...wei.com>
Subject: [PATCH riscv-next] riscv: bpf: Fix eBPF's exception tables

eBPF's exception tables needs to be modified to relative synchronously.

Suggested-by: Tong Tiangen <tongtiangen@...wei.com>
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/net/bpf_jit_comp64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 69bab7e28f91..44c97535bc15 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -498,7 +498,7 @@ static int add_exception_handler(const struct bpf_insn *insn,
 	offset = pc - (long)&ex->insn;
 	if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN))
 		return -ERANGE;
-	ex->insn = pc;
+	ex->insn = offset;
 
 	/*
 	 * Since the extable follows the program, the fixup offset is always
-- 
2.34.1