• Masahiro Yamada's avatar
    modpost: fix tee MODULE_DEVICE_TABLE built on big-endian host · 7f54e00e
    Masahiro Yamada authored
    When MODULE_DEVICE_TABLE(tee, ) 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/char/hw_random/optee-rng.c
    is built as a module for ARM little-endian.
    
    If you build it on a little-endian host, you will get the correct
    MODULE_ALIAS:
    
        $ grep MODULE_ALIAS drivers/char/hw_random/optee-rng.mod.c
        MODULE_ALIAS("tee:ab7a617c-b8e7-4d8f-8301-d09b61036b64*");
    
    However, if you build it on a big-endian host, you will get a wrong
    MODULE_ALIAS:
    
        $ grep MODULE_ALIAS drivers/char/hw_random/optee-rng.mod.c
        MODULE_ALIAS("tee:646b0361-9bd0-0183-8f4d-e7b87c617aab*");
    
    The same problem also occurs when you enable CONFIG_CPU_BIG_ENDIAN,
    and build it on a little-endian host.
    
    This issue has been unnoticed because the ARM kernel is configured for
    little-endian by default, and most likely built on a little-endian host
    (cross-build on x86 or native-build on ARM).
    
    The uuid field must not be reversed because uuid_t is an array of __u8.
    
    Fixes: 0fc1db9d
    
     ("tee: add bus driver framework for TEE based devices")
    Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
    Reviewed-by: default avatarSumit Garg <sumit.garg@linaro.org>
    7f54e00e
file2alias.c 46.4 KB