From: Vasiliy Kulikov <segoon@openwall.com>
Date: Fri, 24 Jun 2011 12:08:38 +0000 (+0400)
Subject: proc: restrict access to /proc/PID/io
X-Git-Tag: v3.0-rc6~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d1221f375c94ef961ba8574ac4f85c8870ddd51;p=pandora-kernel.git

proc: restrict access to /proc/PID/io

/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.

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.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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