linux-kernel - [PATCH 1/2] arm64: bpf: fix JIT frame pointer setup

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Date:	Thu, 12 Nov 2015 13:57:00 -0800
From:	Yang Shi <yang.shi@...aro.org>
To:	ast@...nel.org, daniel@...earbox.net, catalin.marinas@....com,
	will.deacon@....com
Cc:	zlim.lnx@...il.com, xi.wang@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, yang.shi@...aro.org
Subject: [PATCH 1/2] arm64: bpf: fix JIT frame pointer setup

BPF fp should point to the top of the BPF prog stack. The original
implementation made it point to the bottom incorrectly.
Move A64_SP to fp before reserve BPF prog stack space.

CC: Zi Shen Lim <zlim.lnx@...il.com>
CC: Xi Wang <xi.wang@...il.com>
Signed-off-by: Yang Shi <yang.shi@...aro.org>
---
 arch/arm64/net/bpf_jit_comp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index a44e529..ac8b548 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -161,12 +161,12 @@ static void build_prologue(struct jit_ctx *ctx)
 	if (ctx->tmp_used)
 		emit(A64_PUSH(tmp1, tmp2, A64_SP), ctx);
 
-	/* Set up BPF stack */
-	emit(A64_SUB_I(1, A64_SP, A64_SP, stack_size), ctx);
-
 	/* Set up frame pointer */
 	emit(A64_MOV(1, fp, A64_SP), ctx);
 
+	/* Set up BPF stack */
+	emit(A64_SUB_I(1, A64_SP, A64_SP, stack_size), ctx);
+
 	/* Clear registers A and X */
 	emit_a64_mov_i64(ra, 0, ctx);
 	emit_a64_mov_i64(rx, 0, ctx);
-- 
2.0.2

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