This is a note to let you know that I've just added the patch titled
i2c: mark HostNotify target address as used
to the 5.15-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:
i2c-mark-hostnotify-target-address-as-used.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0d8fce5070e81b63e47f290c6b3e38452ac6b1de
Author: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Date: Wed Jul 10 10:55:07 2024 +0200
i2c: mark HostNotify target address as used
[ Upstream commit bd9f5348089b65612e5ca976e2ae22f005340331 ]
I2C core handles the local target for receiving HostNotify alerts. There
is no separate driver bound to that address. That means userspace can
access it if desired, leading to further complications if controllers
are not capable of reading their own local target. Bind the local target
to the dummy driver so it will be marked as "handled by the kernel" if
the HostNotify feature is used. That protects aginst userspace access
and prevents other drivers binding to it.
Fixes: 2a71593da34d ("i2c: smbus: add core function handling SMBus host-notify")
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 505eebbc98a09..dccd94ee138e2 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1041,6 +1041,7 @@ EXPORT_SYMBOL(i2c_find_device_by_fwnode);
static const struct i2c_device_id dummy_id[] = {
{ "dummy", 0 },
+ { "smbus_host_notify", 0 },
{ },
};
