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    SubjectRe: [PATCH 1/2] proc: restrict access to /proc/PID/io
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    On Fri, Jun 24, 2011 at 5:38 PM, Vasiliy Kulikov <segoon@openwall.com> wrote:
    > /proc/PID/io may be used for gathering private information.  E.g. for
    > openssh and vsftpd daemons wchars/rchars may be used to learn the
    > precise password length.  Restrict it to processes being able to ptrace
    > the target process.
    >

    Hmm.. How do I reproduce this, won't they be enough randomness around
    rchar/wchar by the time the attacker reads it?

    > ptrace_may_access() is needed to prevent keeping open file descriptor of
    > "io" file, executing setuid binary and gathering io information of the
    > setuid'ed process.

    Balbir Singh
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