lib/mpi: kunmap after finishing accessing buffer

[mirror_ubuntu-artful-kernel.git] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 789c6e9e5e011f968f2958da42a8109fdbc5c9c1..98fe715522e8d1834083e608d32a78ed0600deb9 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1223,6 +1223,34 @@ config STACKTRACE
          It is also used by various kernel debugging features that require
          stack trace generation.
 
+config WARN_ALL_UNSEEDED_RANDOM
+       bool "Warn for all uses of unseeded randomness"
+       default n
+       help
+         Some parts of the kernel contain bugs relating to their use of
+         cryptographically secure random numbers before it's actually possible
+         to generate those numbers securely. This setting ensures that these
+         flaws don't go unnoticed, by enabling a message, should this ever
+         occur. This will allow people with obscure setups to know when things
+         are going wrong, so that they might contact developers about fixing
+         it.
+
+         Unfortunately, on some models of some architectures getting
+         a fully seeded CRNG is extremely difficult, and so this can
+         result in dmesg getting spammed for a surprisingly long
+         time.  This is really bad from a security perspective, and
+         so architecture maintainers really need to do what they can
+         to get the CRNG seeded sooner after the system is booted.
+         However, since users can not do anything actionble to
+         address this, by default the kernel will issue only a single
+         warning for the first use of unseeded randomness.
+
+         Say Y here if you want to receive warnings for all uses of
+         unseeded randomness.  This will be of use primarily for
+         those developers interersted in improving the security of
+         Linux kernels running on their architecture (or
+         subarchitecture).
+
 config DEBUG_KOBJECT
        bool "kobject debugging"
        depends on DEBUG_KERNEL