Hi Greg,
On Wed, Aug 19, 2020 at 03:22:56PM +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.
--
Regards
Sudip
>From 1811e33f6cb0b3dde721c82ff14a15149ea319eb Mon Sep 17 00:00:00 2001
From: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Date: Thu, 23 Jul 2020 01:40:46 +0530
Subject: [PATCH] remoteproc: qcom_q6v5_mss: Validate modem blob firmware size
before load
commit 135b9e8d1cd8ba5ac9ad9bcf24b464b7b052e5b8 upstream
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
...
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/20200722201047.12975-3-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 | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index 28ea17894bad..604828c04ddf 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -745,14 +745,13 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
if (phdr->p_filesz) {
snprintf(seg_name, sizeof(seg_name), "modem.b%02d", i);
- ret = request_firmware(&seg_fw, seg_name, qproc->dev);
+ ret = request_firmware_into_buf(&seg_fw, seg_name, qproc->dev,
+ ptr, phdr->p_filesz);
if (ret) {
dev_err(qproc->dev, "failed to load %s\n", seg_name);
goto release_firmware;
}
- memcpy(ptr, seg_fw->data, seg_fw->size);
-
release_firmware(seg_fw);
}
--
2.30.0
