linux-kernel - [RESEND PATCH v3 06/10] spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1638403212-29265-7-git-send-email-quic_fenglinw@quicinc.com>
Date:   Thu, 2 Dec 2021 08:00:08 +0800
From:   Fenglin Wu <quic_fenglinw@...cinc.com>
To:     <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sboyd@...nel.org>
CC:     <collinsd@...eaurora.org>, <subbaram@...eaurora.org>,
        <quic_fenglinw@...cinc.com>, <tglx@...utronix.de>, <maz@...nel.org>
Subject: [RESEND PATCH v3 06/10] spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes

From: David Collins <collinsd@...eaurora.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@...eaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.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