Description: proc: restrict access to /proc/PID/io
References:
 https://patchwork.kernel.org/patch/916032/
Notes:
Bugs:
upstream: released (3.0-rc6) [1d1221f375c94ef961ba8574ac4f85c8870ddd51, 293eb1e7772b25a93647c798c7b89bf26c2da2e0]
2.6.32-upstream-stable: released (2.6.32.44)
sid: released (3.0.0-1) 
2.6.26-lenny-security: released (2.6.26-26lenny4) [bugfix/all/proc-restrict-access-to-proc-pid-io.patch]
2.6.32-squeeze-security: released (2.6.32-35squeeze1) [bugfix/all/proc-restrict-access-to-proc-pid-io.patch, bugfix/all/proc-fix-a-race-in-do_io_accounting.patch]