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@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e013f455d95add874f310dc47c608e8c70692ae5 Mon Sep 17 00:00:00 2001

From: Sibi Sankar sibis@codeaurora.org Date: Thu, 23 Jul 2020 01:40:45 +0530 Subject: [PATCH] remoteproc: qcom_q6v5_mss: Validate MBA firmware size before load

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

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index 03d7f3d702b3..7826f229957d 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -411,6 +411,12 @@ 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;