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

Sibi Sankar
2020-07-22T20:11:20Z

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(+)

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;