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    powerpc: Add a framework for Kernel Userspace Access Protection · de78a9c4
    Christophe Leroy authored
    
    
    This patch implements a framework for Kernel Userspace Access
    Protection.
    
    Then subarches will have the possibility to provide their own
    implementation by providing setup_kuap() and
    allow/prevent_user_access().
    
    Some platforms will need to know the area accessed and whether it is
    accessed from read, write or both. Therefore source, destination and
    size and handed over to the two functions.
    
    mpe: Rename to allow/prevent rather than unlock/lock, and add
    read/write wrappers. Drop the 32-bit code for now until we have an
    implementation for it. Add kuap to pt_regs for 64-bit as well as
    32-bit. Don't split strings, use pr_crit_ratelimited().
    
    Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
    Signed-off-by: default avatarRussell Currey <ruscur@russell.cc>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    de78a9c4