Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Fenglin Wu <quic_fenglinw@quicinc.com>
To:     <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <sboyd@kernel.org>
CC:     <collinsd@codeaurora.org>, <subbaram@codeaurora.org>,
        <quic_fenglinw@quicinc.com>
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>
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
Content-Type: text/plain
Precedence: bulk

From: David Collins <collinsd@codeaurora.org>

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 <collinsd@codeaurora.org>
---
 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;
 	}
-- 
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.