• Ard Biesheuvel's avatar
    gcc-plugins: structleak: add option to init all vars used as byref args · f7dd2507
    Ard Biesheuvel authored
    
    
    In the Linux kernel, struct type variables are rarely passed by-value,
    and so functions that initialize such variables typically take an input
    reference to the variable rather than returning a value that can
    subsequently be used in an assignment.
    
    If the initalization function is not part of the same compilation unit,
    the lack of an assignment operation defeats any analysis the compiler
    can perform as to whether the variable may be used before having been
    initialized. This means we may end up passing on such variables
    uninitialized, resulting in potential information leaks.
    
    So extend the existing structleak GCC plugin so it will [optionally]
    apply to all struct type variables that have their address taken at any
    point, rather than only to variables of struct types that have a __user
    annotation.
    
    Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: default avatarKees Cook <keescook@chromium.org>
    f7dd2507