diff mbox series

[v3,1/3] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load

Message ID 20200722201047.12975-2-sibis@codeaurora.org
State Mainlined
Commit e013f455d95add874f310dc47c608e8c70692ae5
Headers show
Series Add modem debug features | expand

Commit Message

Sibi Sankar July 22, 2020, 8:10 p.m. UTC
The following mem abort is observed when the mba firmware size exceeds
the allocated mba region. MBA firmware size is restricted to a maximum
size of 1M and remaining memory region is used by modem debug policy
firmware when available. Hence verify whether the MBA firmware size lies
within the allocated memory region and is not greater than 1M before
loading.

Err Logs:
Unable to handle kernel paging request at virtual address
Mem abort info:
...
Call trace:
  __memcpy+0x110/0x180
  rproc_start+0x40/0x218
  rproc_boot+0x5b4/0x608
  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
  __arm64_sys_write+0x24/0x30
...

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 | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Bjorn Andersson July 28, 2020, 5:45 a.m. UTC | #1
On Wed 22 Jul 13:10 PDT 2020, Sibi Sankar wrote:

> The following mem abort is observed when the mba firmware size exceeds
> the allocated mba region. MBA firmware size is restricted to a maximum
> size of 1M and remaining memory region is used by modem debug policy
> firmware when available. Hence verify whether the MBA firmware size lies
> within the allocated memory region and is not greater than 1M before
> loading.
> 
> Err Logs:
> Unable to handle kernel paging request at virtual address
> Mem abort info:
> ...
> Call trace:
>   __memcpy+0x110/0x180
>   rproc_start+0x40/0x218
>   rproc_boot+0x5b4/0x608
>   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
>   __arm64_sys_write+0x24/0x30
> ...
> 
> Fixes: 051fb70fd4ea4 ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
> Cc: stable@vger.kernel.org

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 718acebae777f..4e72c9e30426c 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -412,6 +412,12 @@ static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
>  {
>  	struct q6v5 *qproc = rproc->priv;
>  
> +	/* MBA is restricted to a maximum size of 1M */
> +	if (fw->size > qproc->mba_size || fw->size > SZ_1M) {
> +		dev_err(qproc->dev, "MBA firmware load failed\n");

I'll change this to "MBA firmware exceeds size limit\n". Please let me
know if you object.

Regards,
Bjorn

> +		return -EINVAL;
> +	}
> +
>  	memcpy(qproc->mba_region, fw->data, fw->size);
>  
>  	return 0;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
diff mbox series

Patch

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 718acebae777f..4e72c9e30426c 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -412,6 +412,12 @@  static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct q6v5 *qproc = rproc->priv;
 
+	/* MBA is restricted to a maximum size of 1M */
+	if (fw->size > qproc->mba_size || fw->size > SZ_1M) {
+		dev_err(qproc->dev, "MBA firmware load failed\n");
+		return -EINVAL;
+	}
+
 	memcpy(qproc->mba_region, fw->data, fw->size);
 
 	return 0;