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    SubjectRe: [PATCH] Simplify /proc/<pid|self>/exe symlink code
    On Thu, Jul 12, 2007 at 07:00:12PM -0700, Matt Helsley wrote:
    > This patch avoids holding the mmap semaphore while walking VMAs in response to
    > programs which read or follow the /proc/<pid|self>/exe symlink. This also allows
    > us to merge mmu and nommu proc_exe_link() functions. The costs are holding the
    > task lock, a separate reference to the executable file stored in the task
    > struct, and increased code in fork, exec, and exit paths.

    I don't think it's a food idea. Consider a program that deliberately
    creates an executable anon memory, copies the binary there, jumps there
    and unmaps the original. In the current tree you'll get nothing
    pinning the binary; with your patch it will remained busy.

    It's not a common situation, of course, but there are legitimate uses
    for such technics...
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