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    SubjectRe: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode
    On Tue, May 09, 2017 at 08:45:22AM +0200, Ingo Molnar wrote:
    > We only have ~115 code blocks in the kernel that set/restore KERNEL_DS, it would
    > be a pity to add a runtime check to every system call ...

    I think we should simply strive to remove all of them that aren't
    in core scheduler / arch code. Basically evetyytime we do the

    oldfs = get_fs();
    set_fs(KERNEL_DS);
    ..
    set_fs(oldfs);

    trick we're doing something wrong, and there should always be better
    ways to archive it. E.g. using iov_iter with a ITER_KVEC type
    consistently would already remove most of them.

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