tree 63fa10cd8d895c36bbbacd8c5b38b25e3e1f3448
parent ca1376d10810bc2c20c8d0821a9ee04ca2507c01
author Ingo Molnar <mingo@elte.hu> 1305234028 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1305238696 -0700

vsprintf: Turn kptr_restrict off by default

kptr_restrict has been triggering bugs in apps such as perf, and it also makes
the system less useful by default, so turn it off by default.

This is how we generally handle security features that remove functionality,
such as firewall code or SELinux - they have to be configured and activated
from user-space.

Distributions can turn kptr_restrict on again via this line in
/etc/sysctrl.conf:

kernel.kptr_restrict = 1

( Also mark the variable __read_mostly while at it, as it's typically modified
  only once per bootup, or not at all. )

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>