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Commit 0fcd593b authored by Yang Shi's avatar Yang Shi Committed by David S. Miller
Browse files

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@gmail.com>
CC: Xi Wang <xi.wang@gmail.com>
Signed-off-by: default avatarYang Shi <yang.shi@linaro.org>
Reviewed-by: default avatarZi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7729b053

arch/arm64/net/bpf_jit_comp.c

+3 −3
Original line number Diff line number Diff line
@@ -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);