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    SubjectRe: Potential bug in fs/binfmt_elf.c?
    >>  LOAD           0x001000 0x00400000 0x00400000 0x00000 0x10000000 R   0x1000
    >
    >
    > What is the purpose of allocating 256MB of read-only zeros?

    To prevent the kernel from placing any shared libraries there [via mmap()
    from ld-linux.so.2], especially under the influence of exec-shield.
    This is 'wine', which wants to reserve that address space for mapping
    executables that were built for some other operating system. For this
    purpose, the .p_flags of PF_R instead could be 0 [==> PROT_NONE]; but
    do_brk() still turns either one into 'prw.' which has potential memory
    [over-]commit charges. The expected 'pr--' [or 'p---'] should have
    a memory commit cost of zero.

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