• Michael Ellerman's avatar
    powerpc/64: Define ILLEGAL_POINTER_VALUE for 64-bit · f6853eb5
    Michael Ellerman authored
    This is used in poison.h to offset poison values so that they don't
    point directly into user space.
    
    The value we choose sits roughly between user and kernel space, which
    means on their own the poison values don't point anywhere useful. If an
    attacker can cause an access at some offset from the poison value then
    we may still be in trouble, but by putting the poison values between
    user and kernel space we maximise the required size of that offset.
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    f6853eb5
Kconfig 30 KB