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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>
This commit is contained in:
Ingo Molnar 2011-05-12 23:00:28 +02:00 committed by Linus Torvalds
parent ca1376d108
commit 411f05f123
1 changed files with 1 additions and 1 deletions
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2
lib/vsprintf.c
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@ -797,7 +797,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
return string(buf, end, uuid, spec);
}
int kptr_restrict = 1;
int kptr_restrict __read_mostly;
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed