From patchwork Thu Jul 29 01:12:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenglin Wu X-Patchwork-Id: 488806 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 972FFC4338F for ; Thu, 29 Jul 2021 01:13:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82FC561019 for ; Thu, 29 Jul 2021 01:13:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233342AbhG2BN7 (ORCPT ); Wed, 28 Jul 2021 21:13:59 -0400 Received: from alexa-out-sd-01.qualcomm.com ([199.106.114.38]:64145 "EHLO alexa-out-sd-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233311AbhG2BN5 (ORCPT ); Wed, 28 Jul 2021 21:13:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1627521235; x=1659057235; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=xMDIxzoEbq0aPJ2fBtVchMgpbiMzY/BXvnlgZEBdY1I=; b=mdZhzn/HDRc0bhhfpPBInLQpOU79fFWh1W/HMEOFQ+EbYB6UU5pVhUiV ajsa07Qpxfgy/nSWQRAwwVFxYQACQmS3oAPuteNWSeMIHei+d4cEwucn0 fxBrLJBgH1wSF4jhJCvQhYH5CFcj6BSZUalxRpPnEI9SwxjjRMmKvSIZD Y=; Received: from unknown (HELO ironmsg05-sd.qualcomm.com) ([10.53.140.145]) by alexa-out-sd-01.qualcomm.com with ESMTP; 28 Jul 2021 18:13:54 -0700 X-QCInternal: smtphost Received: from nasanexm03e.na.qualcomm.com ([10.85.0.48]) by ironmsg05-sd.qualcomm.com with ESMTP/TLS/AES256-SHA; 28 Jul 2021 18:13:54 -0700 Received: from fenglinw-gv.qualcomm.com (10.80.80.8) by nasanexm03e.na.qualcomm.com (10.85.0.48) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Wed, 28 Jul 2021 18:13:53 -0700 From: Fenglin Wu To: , , CC: , , Subject: [PATCH V1 6/9] spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes Date: Thu, 29 Jul 2021 09:12:44 +0800 Message-ID: <1627521167-18848-7-git-send-email-quic_fenglinw@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1627521167-18848-1-git-send-email-quic_fenglinw@quicinc.com> References: <1627521167-18848-1-git-send-email-quic_fenglinw@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanexm03e.na.qualcomm.com (10.85.0.48) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: David Collins The system crashes due to an access permission violation when writing to a PMIC peripheral which is not owned by the current ee. Add a check for PMIC arbiter version 5 for such invalid write requests and return an error instead of crashing the system. Signed-off-by: David Collins --- drivers/spmi/spmi-pmic-arb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index f1b72d8..9239830 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -1020,6 +1020,11 @@ static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr, offset = 0x10000 * pmic_arb->ee + 0x80 * apid; break; case PMIC_ARB_CHANNEL_RW: + if (pmic_arb->apid_data[apid].write_ee != pmic_arb->ee) { + dev_err(&pmic_arb->spmic->dev, "disallowed SPMI write to sid=%u, addr=0x%04X\n", + sid, addr); + return -EPERM; + } offset = 0x10000 * apid; break; }