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Tue, 31 Oct 2023 09:51:18 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 39V9pHm1013616 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 31 Oct 2023 09:51:17 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.39; Tue, 31 Oct 2023 02:51:14 -0700 From: Krishna chaitanya chundru Date: Tue, 31 Oct 2023 15:21:05 +0530 Subject: [PATCH v2] bus: mhi: host: Add alignment check for event ring read pointer MIME-Version: 1.0 Message-ID: <20231031-alignment_check-v2-1-1441db7c5efd@quicinc.com> X-B4-Tracking: v=1; b=H4sIAAnOQGUC/2WNQQ6CMBBFr0JmbQ1TrEZX3sMQ0wwDnSgttkg0h LtbiTuX7yX//RkSR+EEp2KGyJMkCT6D3hRAzvqOlTSZQZe6whIrZe/S+Z79eCXHdFOUZWvKY6N 3FvJqiNzKay1e6sxO0hjiez2Y8Gt/Lf3fmlCh0mTNAfeNITTnx1NIPG0p9FAvy/IB7/PwarAAA AA= To: Manivannan Sadhasivam CC: , , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; 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Tue, 31 Oct 2023 02:53:24 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781264293634378924 X-GMAIL-MSGID: 1781264293634378924 Though we do check the event ring read pointer by "is_valid_ring_ptr" to make sure it is in the buffer range, but there is another risk the pointer may be not aligned. Since we are expecting event ring elements are 128 bits(struct mhi_ring_element) aligned, an unaligned read pointer could lead to multiple issues like DoS or ring buffer memory corruption. So add a alignment check for event ring read pointer. Fixes: ec32332df764 ("bus: mhi: core: Sanity check values from remote device before use") cc: stable@vger.kernel.org Signed-off-by: Krishna chaitanya chundru Reviewed-by: Manivannan Sadhasivam Reviewed-by: Jeffrey Hugo --- Changes in v2: - Change the modulus operation to bit-wise & operation as suggested by Jeff. - Link to v1: https://lore.kernel.org/r/20231023-alignment_check-v1-1-2ca5716d5c15@quicinc.com --- drivers/bus/mhi/host/main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- base-commit: 71e68e182e382e951d6248bccc3c960dcec5a718 change-id: 20231013-alignment_check-c013f509d24a Best regards, diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c index 499590437e9b..e765c16a99d1 100644 --- a/drivers/bus/mhi/host/main.c +++ b/drivers/bus/mhi/host/main.c @@ -268,7 +268,8 @@ static void mhi_del_ring_element(struct mhi_controller *mhi_cntrl, static bool is_valid_ring_ptr(struct mhi_ring *ring, dma_addr_t addr) { - return addr >= ring->iommu_base && addr < ring->iommu_base + ring->len; + return addr >= ring->iommu_base && addr < ring->iommu_base + ring->len && + !(addr & (sizeof(struct mhi_ring_element) - 1)); } int mhi_destroy_device(struct device *dev, void *data)