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Tue, 01 Mar 2022 17:51:05 -0800 (PST) Date: Tue, 1 Mar 2022 17:50:46 -0800 In-Reply-To: <20220302015053.1984165-1-titusr@google.com> Message-Id: <20220302015053.1984165-3-titusr@google.com> Mime-Version: 1.0 References: <20220302015053.1984165-1-titusr@google.com> X-Mailer: git-send-email 2.35.1.616.g0bdcbb4464-goog Subject: [PATCH v3 2/9] hw/i2c: pmbus: guard against out of range accesses From: Titus Rwantare To: Corey Minyard Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, f4bug@amsat.org, wuhaotsh@google.com, venture@google.com, peter.maydell@linaro.org, Titus Rwantare Content-Type: text/plain; charset="UTF-8" X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::114a (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::114a; envelope-from=3ic0eYgYKCrYpepqonckkcha.Ykimaiq-Zarahjkjcjq.knc@flex--titusr.bounces.google.com; helo=mail-yw1-x114a.google.com X-Spam_score_int: -81 X-Spam_score: -8.2 X-Spam_bar: -------- X-Spam_report: (-8.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Titus Rwantare --- hw/i2c/pmbus_device.c | 41 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/hw/i2c/pmbus_device.c b/hw/i2c/pmbus_device.c index 07a45c99f9..93c746bab3 100644 --- a/hw/i2c/pmbus_device.c +++ b/hw/i2c/pmbus_device.c @@ -243,18 +243,47 @@ void pmbus_check_limits(PMBusDevice *pmdev) } } +/* assert the status_cml error upon receipt of malformed command */ +static void pmbus_cml_error(PMBusDevice *pmdev) +{ + for (int i = 0; i < pmdev->num_pages; i++) { + pmdev->pages[i].status_word |= PMBUS_STATUS_CML; + pmdev->pages[i].status_cml |= PB_CML_FAULT_INVALID_CMD; + } +} + static uint8_t pmbus_receive_byte(SMBusDevice *smd) { PMBusDevice *pmdev = PMBUS_DEVICE(smd); PMBusDeviceClass *pmdc = PMBUS_DEVICE_GET_CLASS(pmdev); uint8_t ret = 0xFF; - uint8_t index = pmdev->page; + uint8_t index; if (pmdev->out_buf_len != 0) { ret = pmbus_out_buf_pop(pmdev); return ret; } + /* + * Reading from all pages will return the value from page 0, + * this is unspecified behaviour in general. + */ + if (pmdev->page == PB_ALL_PAGES) { + index = 0; + qemu_log_mask(LOG_GUEST_ERROR, + "%s: tried to read from all pages\n", + __func__); + pmbus_cml_error(pmdev); + } else if (pmdev->page > pmdev->num_pages - 1) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: page %d is out of range\n", + __func__, pmdev->page); + pmbus_cml_error(pmdev); + return -1; + } else { + index = pmdev->page; + } + switch (pmdev->code) { case PMBUS_PAGE: pmbus_send8(pmdev, pmdev->page); @@ -1038,6 +1067,7 @@ static int pmbus_write_data(SMBusDevice *smd, uint8_t *buf, uint8_t len) pmdev->page = pmbus_receive8(pmdev); return 0; } + /* loop through all the pages when 0xFF is received */ if (pmdev->page == PB_ALL_PAGES) { for (int i = 0; i < pmdev->num_pages; i++) { @@ -1048,6 +1078,15 @@ static int pmbus_write_data(SMBusDevice *smd, uint8_t *buf, uint8_t len) return 0; } + if (pmdev->page > pmdev->num_pages - 1) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: page %u is out of range\n", + __func__, pmdev->page); + pmdev->page = 0; /* undefined behaviour - reset to page 0 */ + pmbus_cml_error(pmdev); + return -1; + } + index = pmdev->page; switch (pmdev->code) { -- 2.35.1.616.g0bdcbb4464-goog