1 files changed, 18 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 77ebaa3dfa12..770a422a42e8 100644
--- 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