Re: [PATCH] firmware: imx: Align imx SC msg structs to 4

[Leonard Crestez <leonard.crestez@nxp.com>]

On 17.02.2020 08:21, Shawn Guo wrote:
> On Tue, Feb 11, 2020 at 11:24:33PM +0200, Leonard Crestez wrote:
>> The imx SC api strongly assumes that messages are composed out of
>> 4-bytes words but some of our message structs have sizeof "6" and "7".
>>
>> This produces many oopses with CONFIG_KASAN=y:
>>
>> 	BUG: KASAN: stack-out-of-bounds in imx_mu_send_data+0x108/0x1f0
>>
>> It shouldn't cause an issues in normal use because these structs are
>> always allocated on the stack.
>>
>> Cc: stable@vger.kernel.org
> 
> Should we have a fixes tag and send it for -rc?

I haven't check but this would probably have to be split into multiple 
patches because the structs were not added all at once.

> Shawn
> 
>> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
>> Reported-by: Iuliana Prodan <iuliana.prodan@nxp.com>
>> ---
>>   drivers/clk/imx/clk-scu.c               | 8 ++++----
>>   drivers/firmware/imx/misc.c             | 8 ++++----
>>   drivers/firmware/imx/scu-pd.c           | 2 +-
>>   drivers/pinctrl/freescale/pinctrl-scu.c | 4 ++--
>>   drivers/rtc/rtc-imx-sc.c                | 2 +-
>>   drivers/soc/imx/soc-imx-scu.c           | 2 +-
>>   6 files changed, 13 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
>> index fbef740704d0..b8b2072742a5 100644
>> --- a/drivers/clk/imx/clk-scu.c
>> +++ b/drivers/clk/imx/clk-scu.c
>> @@ -41,16 +41,16 @@ struct clk_scu {
>>   struct imx_sc_msg_req_set_clock_rate {
>>   	struct imx_sc_rpc_msg hdr;
>>   	__le32 rate;
>>   	__le16 resource;
>>   	u8 clk;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct req_get_clock_rate {
>>   	__le16 resource;
>>   	u8 clk;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct resp_get_clock_rate {
>>   	__le32 rate;
>>   };
>>   
>> @@ -82,11 +82,11 @@ struct imx_sc_msg_get_clock_parent {
>>   	struct imx_sc_rpc_msg hdr;
>>   	union {
>>   		struct req_get_clock_parent {
>>   			__le16 resource;
>>   			u8 clk;
>> -		} __packed req;
>> +		} __packed __aligned(4) req;
>>   		struct resp_get_clock_parent {
>>   			u8 parent;
>>   		} resp;
>>   	} data;
>>   };
>> @@ -119,11 +119,11 @@ struct imx_sc_msg_req_clock_enable {
>>   	struct imx_sc_rpc_msg hdr;
>>   	__le16 resource;
>>   	u8 clk;
>>   	u8 enable;
>>   	u8 autog;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   static inline struct clk_scu *to_clk_scu(struct clk_hw *hw)
>>   {
>>   	return container_of(hw, struct clk_scu, hw);
>>   }
>> diff --git a/drivers/firmware/imx/misc.c b/drivers/firmware/imx/misc.c
>> index 4b56a587dacd..d073cb3ce699 100644
>> --- a/drivers/firmware/imx/misc.c
>> +++ b/drivers/firmware/imx/misc.c
>> @@ -14,30 +14,30 @@
>>   struct imx_sc_msg_req_misc_set_ctrl {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 ctrl;
>>   	u32 val;
>>   	u16 resource;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_req_cpu_start {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 address_hi;
>>   	u32 address_lo;
>>   	u16 resource;
>>   	u8 enable;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_req_misc_get_ctrl {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 ctrl;
>>   	u16 resource;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_resp_misc_get_ctrl {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 val;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   /*
>>    * This function sets a miscellaneous control value.
>>    *
>>    * @param[in]     ipc         IPC handle
>> diff --git a/drivers/firmware/imx/scu-pd.c b/drivers/firmware/imx/scu-pd.c
>> index b556612207e5..af3ae0087de4 100644
>> --- a/drivers/firmware/imx/scu-pd.c
>> +++ b/drivers/firmware/imx/scu-pd.c
>> @@ -59,11 +59,11 @@
>>   /* SCU Power Mode Protocol definition */
>>   struct imx_sc_msg_req_set_resource_power_mode {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u16 resource;
>>   	u8 mode;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   #define IMX_SCU_PD_NAME_SIZE 20
>>   struct imx_sc_pm_domain {
>>   	struct generic_pm_domain pd;
>>   	char name[IMX_SCU_PD_NAME_SIZE];
>> diff --git a/drivers/pinctrl/freescale/pinctrl-scu.c b/drivers/pinctrl/freescale/pinctrl-scu.c
>> index 73bf1d9f9cc6..23cf04bdfc55 100644
>> --- a/drivers/pinctrl/freescale/pinctrl-scu.c
>> +++ b/drivers/pinctrl/freescale/pinctrl-scu.c
>> @@ -21,16 +21,16 @@ enum pad_func_e {
>>   
>>   struct imx_sc_msg_req_pad_set {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 val;
>>   	u16 pad;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_req_pad_get {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u16 pad;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_resp_pad_get {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 val;
>>   } __packed;
>> diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
>> index cf2c12107f2b..a5f59e6f862e 100644
>> --- a/drivers/rtc/rtc-imx-sc.c
>> +++ b/drivers/rtc/rtc-imx-sc.c
>> @@ -35,11 +35,11 @@ struct imx_sc_msg_timer_rtc_set_alarm {
>>   	u8 mon;
>>   	u8 day;
>>   	u8 hour;
>>   	u8 min;
>>   	u8 sec;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
>>   {
>>   	struct imx_sc_msg_timer_get_rtc_time msg;
>>   	struct imx_sc_rpc_msg *hdr = &msg.hdr;
>> diff --git a/drivers/soc/imx/soc-imx-scu.c b/drivers/soc/imx/soc-imx-scu.c
>> index fb70b8a3f7c5..20d37eaeb5f2 100644
>> --- a/drivers/soc/imx/soc-imx-scu.c
>> +++ b/drivers/soc/imx/soc-imx-scu.c
>> @@ -23,11 +23,11 @@ struct imx_sc_msg_misc_get_soc_id {
>>   		} __packed req;
>>   		struct {
>>   			u32 id;
>>   		} resp;
>>   	} data;
>> -} __packed;
>> +} __packed __aligned(4);
>>   
>>   struct imx_sc_msg_misc_get_soc_uid {
>>   	struct imx_sc_rpc_msg hdr;
>>   	u32 uid_low;
>>   	u32 uid_high;
>> -- 
>> 2.17.1
>>
>