[PATCH 4.9 03/49] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load

Greg Kroah-Hartman
2021-02-22T13:39:24Z

From: Sibi Sankar <sibis@codeaurora.org>

commit e013f455d95add874f310dc47c608e8c70692ae5 upstream

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
...

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Fixes: 051fb70fd4ea4 ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
Cc: stable@vger.kernel.org
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20200722201047.12975-2-sibis@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
[sudip: manual backport to old file path]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/remoteproc/qcom_q6v5_pil.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -193,6 +193,12 @@ static int q6v5_load(struct rproc *rproc
{
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;