git: DragonFly_RELEASE_4_6 systat - Restrict %rip sampling to root

[Matthew Dillon]

commit e40d86e596b00f78af2d9fbc5631bb04adea6b83
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Wed Jul 27 16:22:11 2016 -0700

    systat - Restrict %rip sampling to root
    
    * Only allow root to sample the %rip and %rsp on all cpus.  The sysctl will
      not sample and return 0 for these fields if the uid is not root.
    
      This is for security, as %rip sampling can be used to break cryptographic
      keys.
    
    * systat -pv 1 will not display the sampling columns if the sample value
      is 0.

Summary of changes:
 sys/kern/kern_clock.c    | 19 ++++++++++++++++---
 usr.bin/systat/vmmeter.c | 27 +++++++++++++++++++--------
 2 files changed, 35 insertions(+), 11 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/e40d86e596b00f78af2d9fbc5631bb04adea6b83


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