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    SubjectRe: [PATCH][COMPAT] compat_sys_fcntl{,64} 1/9 Generic part

    > Now there used to be some code that did:
    > if (get_user(a, &userstruct->firstmember) ||
    > __get_user(b, &userstruct->secondmember))
    > return -EFAULT;
    > Assuming that the access_ok in get_user for sizeof(firstmember) covers
    > secondmember too which doesn't do access_ok in __get_user. This only
    > works assuming it should handle 64bit pointers when there is a memory
    > hole at the end of the user process space, otherwise it could
    > access kernel pages directly after TASK_SIZE. x86-64 has a big enough
    > hole there, i assume sparc64 and ia64 have too, but i don't know
    > about the other 64bit ports.

    Yeah there are a bunch of those in the ioctl and syscall translation
    code that annoys me. ppc64 is safe too, but its not something we should
    rely on.

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      Last update: 2005-03-22 13:33    [W:0.018 / U:36.016 seconds]
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