From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C08ADC3A5A8 for ; Wed, 4 Sep 2019 16:02:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A8882341D for ; Wed, 4 Sep 2019 16:02:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567612949; bh=2ibOJCskqyyIBOusPY1iCMu2HpaNxbbIeVYJZPmsBhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=L0S9DkK2QoxXH3cmoPRmRdXqMD7YtKq6JXIhWXnRe45G4tyxkUhhGLHsUDRMAnGgD P7dILxBj4M91UgcFzhb7vF4yw3QIn9GTAZ5fjrM5a3AyfNVfm9k+5qgZTuY/p8tLxF bKQPZNiXVxBdsk61g0P0WM4GpwI9WkQU5+6l7rDA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733295AbfIDQC2 (ORCPT ); Wed, 4 Sep 2019 12:02:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:38342 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733258AbfIDQCZ (ORCPT ); Wed, 4 Sep 2019 12:02:25 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 145682070C; Wed, 4 Sep 2019 16:02:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567612944; bh=2ibOJCskqyyIBOusPY1iCMu2HpaNxbbIeVYJZPmsBhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Yks6/Nv+F1HZip3lKAasBHIkJrIffMDanhXmzhyTfmaB6bmevVJbsDlaq+Rjo1hvy 0asDP6xP2r0cOHZPP8vQRHFE9SZG7rCBWwWQyN+avbNueHXKbrDGjRxSM+aQbyi6DT 9V9J26YtBKKycp73g0e6+t1Q0QcKGmT/UR30kBok= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ilya Leoshkevich , Vasily Gorbik , Daniel Borkmann , Sasha Levin , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 02/27] s390/bpf: fix lcgr instruction encoding Date: Wed, 4 Sep 2019 12:01:55 -0400 Message-Id: <20190904160220.4545-2-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190904160220.4545-1-sashal@kernel.org> References: <20190904160220.4545-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ilya Leoshkevich [ Upstream commit bb2d267c448f4bc3a3389d97c56391cb779178ae ] "masking, test in bounds 3" fails on s390, because BPF_ALU64_IMM(BPF_NEG, BPF_REG_2, 0) ignores the top 32 bits of BPF_REG_2. The reason is that JIT emits lcgfr instead of lcgr. The associated comment indicates that the code was intended to emit lcgr in the first place, it's just that the wrong opcode was used. Fix by using the correct opcode. Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend") Signed-off-by: Ilya Leoshkevich Acked-by: Vasily Gorbik Signed-off-by: Daniel Borkmann Signed-off-by: Sasha Levin --- arch/s390/net/bpf_jit_comp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index 896344b6e0363..e4616090732a4 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -881,7 +881,7 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i break; case BPF_ALU64 | BPF_NEG: /* dst = -dst */ /* lcgr %dst,%dst */ - EMIT4(0xb9130000, dst_reg, dst_reg); + EMIT4(0xb9030000, dst_reg, dst_reg); break; /* * BPF_FROM_BE/LE -- 2.20.1