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[34.168.148.209]) by smtp.gmail.com with UTF8SMTPSA id kd5-20020a17090313c500b001d8ffe741basm753922plb.36.2024.02.08.22.05.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Feb 2024 22:05:44 -0800 (PST) From: Abhishek Pandit-Subedi To: Heikki Krogerus , linux-usb@vger.kernel.org Cc: jthies@google.com, pmalani@chromium.org, Abhishek Pandit-Subedi , Neil Armstrong , Andy Shevchenko , Dmitry Baryshkov , Fabrice Gasnier , Greg Kroah-Hartman , Hans de Goede , Rajaram Regupathy , Saranya Gopal , linux-kernel@vger.kernel.org Subject: [PATCH v4 1/3] usb: typec: ucsi: Limit read size on v1.2 Date: Thu, 8 Feb 2024 22:02:38 -0800 Message-ID: <20240208220230.v4.1.Iacf5570a66b82b73ef03daa6557e2fc0db10266a@changeid> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog In-Reply-To: <20240209060353.6613-1-abhishekpandit@chromium.org> References: <20240209060353.6613-1-abhishekpandit@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790400325910247708 X-GMAIL-MSGID: 1790400325910247708 Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was increased from 16 to 256. In order to avoid overflowing reads for older systems, add a mechanism to use the read UCSI version to truncate read sizes on UCSI v1.2. Tested-by: Neil Armstrong Reviewed-by: Prashant Malani Reviewed-by: Heikki Krogerus Signed-off-by: Abhishek Pandit-Subedi --- Tested on 6.6 kernel. Dmesg output from this change: [ 105.058162] ucsi_um_test ucsi_um_test_device.0: Registered UCSI interface with version 3.0.0 Changes in v4: - Added missing Tested-By tags from v1 and reviewed-by tags. Changes in v2: - Changed log message to DEBUG drivers/usb/typec/ucsi/ucsi.c | 26 ++++++++++++++++++++++++-- drivers/usb/typec/ucsi/ucsi.h | 11 +++++++++++ 2 files changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 14f5a7bfae2e..d9a345ec62c3 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -36,6 +36,19 @@ */ #define UCSI_SWAP_TIMEOUT_MS 5000 +static int ucsi_read_message_in(struct ucsi *ucsi, void *buf, + size_t buf_size) +{ + /* + * Below UCSI 2.0, MESSAGE_IN was limited to 16 bytes. Truncate the + * reads here. + */ + if (ucsi->version <= UCSI_VERSION_1_2) + buf_size = min_t(size_t, 16, buf_size); + + return ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, buf, buf_size); +} + static int ucsi_acknowledge_command(struct ucsi *ucsi) { u64 ctrl; @@ -72,7 +85,7 @@ static int ucsi_read_error(struct ucsi *ucsi) if (ret < 0) return ret; - ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error)); + ret = ucsi_read_message_in(ucsi, &error, sizeof(error)); if (ret) return ret; @@ -170,7 +183,7 @@ int ucsi_send_command(struct ucsi *ucsi, u64 command, length = ret; if (data) { - ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size); + ret = ucsi_read_message_in(ucsi, data, size); if (ret) goto out; } @@ -1558,6 +1571,15 @@ int ucsi_register(struct ucsi *ucsi) if (!ucsi->version) return -ENODEV; + /* + * Version format is JJ.M.N (JJ = Major version, M = Minor version, + * N = sub-minor version). + */ + dev_dbg(ucsi->dev, "Registered UCSI interface with version %x.%x.%x", + UCSI_BCD_GET_MAJOR(ucsi->version), + UCSI_BCD_GET_MINOR(ucsi->version), + UCSI_BCD_GET_SUBMINOR(ucsi->version)); + queue_delayed_work(system_long_wq, &ucsi->work, 0); ucsi_debugfs_register(ucsi); diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h index 6478016d5cb8..bec920fa6b8a 100644 --- a/drivers/usb/typec/ucsi/ucsi.h +++ b/drivers/usb/typec/ucsi/ucsi.h @@ -23,6 +23,17 @@ struct dentry; #define UCSI_CONTROL 8 #define UCSI_MESSAGE_IN 16 #define UCSI_MESSAGE_OUT 32 +#define UCSIv2_MESSAGE_OUT 272 + +/* UCSI versions */ +#define UCSI_VERSION_1_2 0x0120 +#define UCSI_VERSION_2_0 0x0200 +#define UCSI_VERSION_2_1 0x0210 +#define UCSI_VERSION_3_0 0x0300 + +#define UCSI_BCD_GET_MAJOR(_v_) (((_v_) >> 8) & 0xFF) +#define UCSI_BCD_GET_MINOR(_v_) (((_v_) >> 4) & 0x0F) +#define UCSI_BCD_GET_SUBMINOR(_v_) ((_v_) & 0x0F) /* Command Status and Connector Change Indication (CCI) bits */ #define UCSI_CCI_CONNECTOR(_c_) (((_c_) & GENMASK(7, 1)) >> 1)