On 2023-10-08 02:04:45+0900, Masahiro Yamada wrote:
> When MODULE_DEVICE_TABLE(ishtp, ) is built on a host with a different
> endianness from the target architecture, it results in an incorrect
> MODULE_ALIAS().
>
> For example, see a case where drivers/platform/x86/intel/ishtp_eclite.c
> is built as a module.
Nitpick:
... [as a module] for x86.
So the statements below can be interpreted correctly.
>
> If you build it on a little endian host, you will get the correct
> MODULE_ALIAS:
>
> $ grep MODULE_ALIAS drivers/platform/x86/intel/ishtp_eclite.mod.c
> MODULE_ALIAS("ishtp:{6A19CC4B-D760-4DE3-B14D-F25EBD0FBCD9}");
>
> However, if you build it on a big endian host, you will get a wrong
> MODULE_ALIAS:
>
> $ grep MODULE_ALIAS drivers/platform/x86/intel/ishtp_eclite.mod.c
> MODULE_ALIAS("ishtp:{BD0FBCD9-F25E-B14D-4DE3-D7606A19CC4B}");
>
> This issue has been unnoticed because the x86 kernel is most likely built
> natively on an x86 host.
>
> The guid field must not be reversed because guid_t is an array of __u8.
>
> Fixes: fa443bc3c1e4 ("HID: intel-ish-hid: add support for MODULE_DEVICE_TABLE()")
+ Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Reviewed-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Thanks!
> ---
>
> scripts/mod/file2alias.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 70bf6a2f585c..6583b36dbe69 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1401,10 +1401,10 @@ static int do_mhi_ep_entry(const char *filename, void *symval, char *alias)
> /* Looks like: ishtp:{guid} */
> static int do_ishtp_entry(const char *filename, void *symval, char *alias)
> {
> - DEF_FIELD(symval, ishtp_device_id, guid);
> + DEF_FIELD_ADDR(symval, ishtp_device_id, guid);
>
> strcpy(alias, ISHTP_MODULE_PREFIX "{");
> - add_guid(alias, guid);
> + add_guid(alias, *guid);
> strcat(alias, "}");
>
> return 1;
> --
> 2.39.2
>
