6.9-stable review patch. If anyone has any objections, please let me know.
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From: Wolfram Sang wsa+renesas@sang-engineering.com
[ 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@sang-engineering.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/i2c-core-base.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index db0d1ac82910e..7e7b15440832b 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1067,6 +1067,7 @@ EXPORT_SYMBOL(i2c_find_device_by_fwnode);
static const struct i2c_device_id dummy_id[] = { { "dummy", 0 }, + { "smbus_host_notify", 0 }, { }, };