Hi Greg,
On Wed, Aug 19, 2020 at 03:22:36PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> The patch below does not apply to the 4.19-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
Here is the backport, will also apply to 4.14-stable and 4.9-stable.
--
Regards
Sudip
>From 7d37a8a02ba946cc76d519611d7f664c9dc73be5 Mon Sep 17 00:00:00 2001
From: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Date: Thu, 23 Jul 2020 01:40:45 +0530
Subject: [PATCH] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before
load
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@xxxxxxxxxx>
Fixes: 051fb70fd4ea4 ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200722201047.12975-2-sibis@xxxxxxxxxxxxxx
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
[sudip: manual backport to old file path]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
drivers/remoteproc/qcom_q6v5_pil.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index cc475dcbf27f..28ea17894bad 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -340,6 +340,12 @@ 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;
--
2.30.0
