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b=VyzXoEz032/ygCBfU8o2DxqTE/b8CfisWdtU0CIt9EUvaNGNot8CjtCSxxLpKAMpmQ3L3pwKt99NgWP0a7o+GibbC+7uEtJ+K/CI/mRhRJAGQ9dDtZK52lAsUcai0Xc1pOrdEGZYjlISMqcpn7AQgWGBnOyy/DiNkXZptu+KVfUeZO8MtY70QNANh3SjGWn+oJF/CmHCXo51RHZpdNrayContVOIKhmDMZJUdW2yGS0XmGwTQr2rpDHHt/kSVmitH9zLep0e6Y6eEISDLzKucjBosA3SVQpU6Zrc8ENn3tKnPTJO9Au8QBEdvAUTHBDrewmlgN6oBVUxSSXDQeZ5MA== From: Andrii Chepurnyi To: "xen-devel@lists.xenproject.org" CC: Oleksandr Tyshchenko , "andrii.chepurnyi82@gmail.com" , Andrii Chepurnyi , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH] arm/ioreq: clean data field in ioreq struct on read operations Thread-Topic: [PATCH] arm/ioreq: clean data field in ioreq struct on read operations Thread-Index: AQHZ9fw82LZSu4lXwEi+r3jS4xqDmw== Date: Tue, 3 Oct 2023 13:19:28 +0000 Message-ID: <20231003131923.2289867-1-andrii_chepurnyi@epam.com> Accept-Language: uk-UA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: AS8PR03MB9583:EE_|DB3PR0302MB9087:EE_ x-ms-office365-filtering-correlation-id: bc743080-2102-499d-bec6-08dbc4135f6f x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="utf-8" For read operations, there's a potential issue when the data field of the ioreq struct is partially updated in the response. To address this, zero data field during read operations. This modification serves as a safeguard against implementations that may inadvertently partially update the data field in response to read requests. For instance, consider an 8-bit read operation. In such cases, QEMU, returns the same content of the data field with only 8 bits of updated data. This behavior could potentially result in the propagation of incorrect or unintended data to user-space applications. Signed-off-by: Andrii Chepurnyi --- xen/arch/arm/ioreq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/arm/ioreq.c b/xen/arch/arm/ioreq.c index 3bed0a14c0..aaa2842acc 100644 --- a/xen/arch/arm/ioreq.c +++ b/xen/arch/arm/ioreq.c @@ -80,7 +80,7 @@ enum io_state try_fwd_ioserv(struct cpu_user_regs *regs, =20 ASSERT(dabt.valid); =20 - p.data =3D get_user_reg(regs, info->dabt.reg); + p.data =3D (p.dir) ? 0 : get_user_reg(regs, info->dabt.reg); vio->req =3D p; vio->suspended =3D false; vio->info.dabt_instr =3D instr; --=20 2.25.1