| Message ID | 42331b70-bd3c-496c-8c79-3ec4faad40b8@moroto.mountain (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | hwmon: (cros_ec) Prevent read overflow in probe() | expand |
On 6/6/24 06:12, Dan Carpenter wrote: > The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily > been NUL terminated. We had not intended to read past "sensor_name_size" > bytes, however, there is a width vs precision bug in the format string. > The format needs to be precision '%.*s' instead of width '%*s'. > Precision prevents an out of bounds read, but width is a no-op. > > Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver") > Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/hwmon/cros_ec_hwmon.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hwmon/cros_ec_hwmon.c b/drivers/hwmon/cros_ec_hwmon.c > index 41f268fa8260..b3ba7247e06b 100644 > --- a/drivers/hwmon/cros_ec_hwmon.c > +++ b/drivers/hwmon/cros_ec_hwmon.c > @@ -212,7 +212,7 @@ static void cros_ec_hwmon_probe_temp_sensors(struct device *dev, struct cros_ec_ > continue; > > sensor_name_size = strnlen(resp.sensor_name, sizeof(resp.sensor_name)); > - priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%*s", > + priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%.*s", > (int)sensor_name_size, > resp.sensor_name); > }
Thanks! On 2024-06-06 16:12:11+0000, Dan Carpenter wrote: > The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily > been NUL terminated. We had not intended to read past "sensor_name_size" > bytes, however, there is a width vs precision bug in the format string. > The format needs to be precision '%.*s' instead of width '%*s'. > Precision prevents an out of bounds read, but width is a no-op. > > Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver") > Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Acked-by: Thomas Weißschuh <linux@weissschuh.net> devm_kstrndup() would have been nice. Thomas
Hello: This patch was applied to chrome-platform/linux.git (for-kernelci) by Tzung-Bi Shih <tzungbi@kernel.org>: On Thu, 6 Jun 2024 16:12:11 +0300 you wrote: > The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily > been NUL terminated. We had not intended to read past "sensor_name_size" > bytes, however, there is a width vs precision bug in the format string. > The format needs to be precision '%.*s' instead of width '%*s'. > Precision prevents an out of bounds read, but width is a no-op. > > Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver") > Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> > > [...] Here is the summary with links: - hwmon: (cros_ec) Prevent read overflow in probe() https://git.kernel.org/chrome-platform/c/1f72dd046270 You are awesome, thank you!
Hello: This patch was applied to chrome-platform/linux.git (for-next) by Tzung-Bi Shih <tzungbi@kernel.org>: On Thu, 6 Jun 2024 16:12:11 +0300 you wrote: > The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily > been NUL terminated. We had not intended to read past "sensor_name_size" > bytes, however, there is a width vs precision bug in the format string. > The format needs to be precision '%.*s' instead of width '%*s'. > Precision prevents an out of bounds read, but width is a no-op. > > Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver") > Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> > > [...] Here is the summary with links: - hwmon: (cros_ec) Prevent read overflow in probe() https://git.kernel.org/chrome-platform/c/1f72dd046270 You are awesome, thank you!
diff --git a/drivers/hwmon/cros_ec_hwmon.c b/drivers/hwmon/cros_ec_hwmon.c index 41f268fa8260..b3ba7247e06b 100644 --- a/drivers/hwmon/cros_ec_hwmon.c +++ b/drivers/hwmon/cros_ec_hwmon.c @@ -212,7 +212,7 @@ static void cros_ec_hwmon_probe_temp_sensors(struct device *dev, struct cros_ec_ continue; sensor_name_size = strnlen(resp.sensor_name, sizeof(resp.sensor_name)); - priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%*s", + priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%.*s", (int)sensor_name_size, resp.sensor_name); }
The "resp.sensor_name" comes from cros_ec_cmd() and it hasn't necessarily been NUL terminated. We had not intended to read past "sensor_name_size" bytes, however, there is a width vs precision bug in the format string. The format needs to be precision '%.*s' instead of width '%*s'. Precision prevents an out of bounds read, but width is a no-op. Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> --- drivers/hwmon/cros_ec_hwmon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)