Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

[karo-tx-linux.git] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 77ebaa3dfa12583a88882c2e416cf5c236a2d6d2..770a422a42e8d3d49deda5cf6d43581ddf1ab220 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1292,6 +1292,24 @@ config LATENCYTOP
          Enable this option if you want to use the LatencyTOP tool
          to find out which userspace is blocking on what kernel operations.
 
+config ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
+       bool
+
+config DEBUG_STRICT_USER_COPY_CHECKS
+       bool "Strict user copy size checks"
+       depends on ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
+       depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING
+       help
+         Enabling this option turns a certain set of sanity checks for user
+         copy operations into compile time failures.
+
+         The copy_from_user() etc checks are there to help test if there
+         are sufficient security checks on the length argument of
+         the copy operation, by having gcc prove that the argument is
+         within bounds.
+
+         If unsure, say N.
+
 source mm/Kconfig.debug
 source kernel/trace/Kconfig