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    SubjectRe: [PATCH] nextfd(2)
    On Sun, Apr 1, 2012 at 21:19, Kyle Moffett <kyle@moffetthome.net> wrote:
    > Well, I imagine one typical usecase for closing all FDs is for
    > security isolation purposes (EG: chroot()+etc),

    chroot and security in the same sentence...?


    > and in a great deal of
    > chroot environments you don't have /proc available.  In particular
    > /proc has been a source of a lot of privilege escalations in the past,
    > so avoiding mounting it in a chroot is good security policy if
    > possible.

    The problem is that the kernel exports quite a bit of information only
    through the /proc and /sys filesystems. I might try to finish my
    comprehensive list of functionality depending on /proc sometime soon.
    The list is quite long.

    Not mounting /proc is inconvenient at best, it renders the environment
    unusable quite often and in some cases is outright insecure.. I don't
    think you can use not mounting /proc as an argument. And, as Peter
    said, the loop over the directory content is quite efficient.

    If you want to avoid /proc I suggest you first work on removing the
    dependencies. Of just secure /proc itself.
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