Linux-remoteproc Archive on lore.kernel.org
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From: Sibi Sankar <sibis@codeaurora.org>
To: bjorn.andersson@linaro.org
Cc: agross@kernel.org, linux-arm-msm@vger.kernel.org,
	linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
	evgreen@chromium.org, ohad@wizery.com,
	Sibi Sankar <sibis@codeaurora.org>,
	stable@vger.kernel.org
Subject: [PATCH v3 2/3] remoteproc: qcom_q6v5_mss: Validate modem blob firmware size before load
Date: Thu, 23 Jul 2020 01:40:46 +0530
Message-ID: <20200722201047.12975-3-sibis@codeaurora.org> (raw)
In-Reply-To: <20200722201047.12975-1-sibis@codeaurora.org>

The following mem abort is observed when one of the modem blob firmware
size exceeds the allocated mpss region. Fix this by restricting the copy
size to segment size using request_firmware_into_buf before load.

Err Logs:
Unable to handle kernel paging request at virtual address
Mem abort info:
...
Call trace:
  __memcpy+0x110/0x180
  rproc_start+0xd0/0x190
  rproc_boot+0x404/0x550
  state_store+0x54/0xf8
  dev_attr_store+0x44/0x60
  sysfs_kf_write+0x58/0x80
  kernfs_fop_write+0x140/0x230
  vfs_write+0xc4/0x208
  ksys_write+0x74/0xf8
...

Fixes: 051fb70fd4ea4 ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
Cc: stable@vger.kernel.org
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_mss.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 4e72c9e30426c..f4aa61ba220dc 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -1174,15 +1174,14 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
 		} else if (phdr->p_filesz) {
 			/* Replace "xxx.xxx" with "xxx.bxx" */
 			sprintf(fw_name + fw_name_len - 3, "b%02d", i);
-			ret = request_firmware(&seg_fw, fw_name, qproc->dev);
+			ret = request_firmware_into_buf(&seg_fw, fw_name, qproc->dev,
+							ptr, phdr->p_filesz);
 			if (ret) {
 				dev_err(qproc->dev, "failed to load %s\n", fw_name);
 				iounmap(ptr);
 				goto release_firmware;
 			}
 
-			memcpy(ptr, seg_fw->data, seg_fw->size);
-
 			release_firmware(seg_fw);
 		}
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22 20:10 [PATCH v3 0/3] Add modem debug features Sibi Sankar
2020-07-22 20:10 ` [PATCH v3 1/3] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load Sibi Sankar
2020-07-28  5:45   ` Bjorn Andersson
2020-07-22 20:10 ` Sibi Sankar [this message]
2020-07-28  6:04   ` [PATCH v3 2/3] remoteproc: qcom_q6v5_mss: Validate modem blob " Bjorn Andersson
2020-07-22 20:10 ` [PATCH v3 3/3] remoteproc: qcom_q6v5_mss: Add modem debug policy support Sibi Sankar
2020-07-28  5:48   ` Bjorn Andersson
2020-07-28  6:40 ` [PATCH v3 0/3] Add modem debug features patchwork-bot+linux-remoteproc

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