Messages in this thread Patch in this message | | | From | "Tobin C. Harding" <> | Subject | [kernel-hardening] [RFC V2 4/6] lib: vsprintf: default kptr_restrict to the maximum value | Date | Sun, 1 Oct 2017 11:06:48 +1100 |
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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.
Signed-off-by: Tobin C. Harding <me@tobin.cc> --- lib/vsprintf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 0271223..e009325 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -396,7 +396,7 @@ 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; /* maximum setting */ /* * return non-zero if we should cleanse pointers for %p and %pK specifiers. -- 2.7.4
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