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[RFC,4/6] lib: vsprintf: default kptr_restrict to the maximum value

Message ID 20170506040737.GE32707@kroah.com (mailing list archive)
State New, archived
Headers show

Commit Message

Greg Kroah-Hartman May 6, 2017, 4:07 a.m. UTC 
From: Dave Weinstein <olorin@google.com>

Set the initial value of kptr_restrict to the maximum
setting rather than the minimum setting, to ensure that
early boot logging is not leaking information.

Cc: William Roberts <william.c.roberts@intel.com>
Cc: Chris Fries <cfries@google.com>
Signed-off-by: Dave Weinstein <olorin@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 lib/vsprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 75a49795fcae..404d477d4bd2 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -395,7 +395,7 @@  struct printf_spec {
 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
 #define PRECISION_MAX ((1 << 15) - 1)
 
-int kptr_restrict __read_mostly;
+int kptr_restrict __read_mostly = 4;
 
 /*
  * Always cleanse %p and %pK specifiers