This is a note to let you know that I've just added the patch titled
remoteproc: mediatek: Make sure IPI buffer fits in L2TCM
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
remoteproc-mediatek-make-sure-ipi-buffer-fits-in-l2tcm.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 331f91d86f71d0bb89a44217cc0b2a22810bbd42 Mon Sep 17 00:00:00 2001
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Date: Thu, 21 Mar 2024 09:46:13 +0100
Subject: remoteproc: mediatek: Make sure IPI buffer fits in L2TCM
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
commit 331f91d86f71d0bb89a44217cc0b2a22810bbd42 upstream.
The IPI buffer location is read from the firmware that we load to the
System Companion Processor, and it's not granted that both the SRAM
(L2TCM) size that is defined in the devicetree node is large enough
for that, and while this is especially true for multi-core SCP, it's
still useful to check on single-core variants as well.
Failing to perform this check may make this driver perform R/W
operations out of the L2TCM boundary, resulting (at best) in a
kernel panic.
To fix that, check that the IPI buffer fits, otherwise return a
failure and refuse to boot the relevant SCP core (or the SCP at
all, if this is single core).
Fixes: 3efa0ea743b7 ("remoteproc/mediatek: read IPI buffer offset from FW")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240321084614.45253-2-angelogioacchino.delregno@xxxxxxxxxxxxx
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/remoteproc/mtk_scp.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -132,7 +132,7 @@ static int scp_elf_read_ipi_buf_addr(str
static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw)
{
int ret;
- size_t offset;
+ size_t buf_sz, offset;
/* read the ipi buf addr from FW itself first */
ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset);
@@ -144,6 +144,14 @@ static int scp_ipi_init(struct mtk_scp *
}
dev_info(scp->dev, "IPI buf addr %#010zx\n", offset);
+ /* Make sure IPI buffer fits in the L2TCM range assigned to this core */
+ buf_sz = sizeof(*scp->recv_buf) + sizeof(*scp->send_buf);
+
+ if (scp->sram_size < buf_sz + offset) {
+ dev_err(scp->dev, "IPI buffer does not fit in SRAM.\n");
+ return -EOVERFLOW;
+ }
+
scp->recv_buf = (struct mtk_share_obj __iomem *)
(scp->sram_base + offset);
scp->send_buf = (struct mtk_share_obj __iomem *)
Patches currently in stable-queue which might be from angelogioacchino.delregno@xxxxxxxxxxxxx are
queue-6.8/remoteproc-mediatek-make-sure-ipi-buffer-fits-in-l2tcm.patch
