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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>, <tglx@linutronix.de>,
	<maz@kernel.org>
Subject: [RESEND PATCH v2 06/11] spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes
Date: Fri, 12 Nov 2021 12:24:14 +0800	[thread overview]
Message-ID: <1636691059-4305-7-git-send-email-quic_fenglinw@quicinc.com> (raw)
In-Reply-To: <1636691059-4305-1-git-send-email-quic_fenglinw@quicinc.com>

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>
Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
---
 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 011044e..e83342a 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1027,6 +1027,11 @@ 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;
 	}
-- 
2.7.4


  parent reply	other threads:[~2021-11-12  4:25 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-12  4:24 [RESEND PATCH v2 00/11] A bunch of fix and optimization patches in spmi-pmic-arb.c Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 01/11] spmi: pmic-arb: handle spurious interrupt Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 02/11] spmi: pmic-arb: do not ack and clear peripheral interrupts in cleanup_irq Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 03/11] spmi: pmic-arb: check apid against limits before calling irq handler Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 04/11] spmi: pmic-arb: add support to dispatch interrupt based on IRQ status Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 05/11] spmi: pmic-arb: correct duplicate APID to PPID mapping logic Fenglin Wu
2021-11-12  4:24 ` Fenglin Wu [this message]
2021-11-12  4:24 ` [RESEND PATCH v2 07/11] spmi: pmic-arb: clear unexpected interrupt trigger type Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 08/11] bindings: spmi: spmi-pmic-arb: mark interrupt properties as optional Fenglin Wu
2021-11-12 15:13   ` Rob Herring
2021-11-12  4:24 ` [RESEND PATCH v2 09/11] spmi: pmic-arb: make interrupt support optional Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 10/11] spmi: pmic-arb: increase SPMI transaction timeout delay Fenglin Wu
2021-11-12  4:24 ` [RESEND PATCH v2 11/11] dt-bindings: convert qcom,spmi-pmic-arb binding to YAML format Fenglin Wu
2021-11-12 13:48   ` Rob Herring
2021-11-15  0:16     ` Fenglin Wu
2021-11-15  6:38       ` Fenglin Wu

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