sparc: Use __builtin_object_size() to validate the buffer size for copy_from_user()

[sfrench/cifs-2.6.git] / arch / sparc / Kconfig.debug

diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
index 90d5fe223a7458953e866aa376ebd8e5591f244b..9d3c889718ac60e954d2439d74847a3443ed825c 100644 (file)
--- a/arch/sparc/Kconfig.debug
+++ b/arch/sparc/Kconfig.debug
@@ -33,4 +33,18 @@ config FRAME_POINTER
        depends on MCOUNT
        default y
 
+config DEBUG_STRICT_USER_COPY_CHECKS
+       bool "Strict copy size 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, or if you run an older (pre 4.4) gcc, say N.
+
 endmenu