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authorDavid S. Miller <davem@davemloft.net>2009-12-10 23:05:23 -0800
committerDavid S. Miller <davem@davemloft.net>2009-12-10 23:05:23 -0800
commitfb34035e7b4bb3edc7c2dc0683cfe21f57a9574d (patch)
treeddde17e5690d77f4f61c6271fc8b6f520c746851 /arch/sparc/Kconfig.debug
parent4ed5d5e4299f42438dd5ac6dcb1f2168ea4fb02a (diff)
downloadlinux-fb34035e7b4bb3edc7c2dc0683cfe21f57a9574d.tar.gz
sparc: Use __builtin_object_size() to validate the buffer size for copy_from_user()
This mirrors x86 commit 9f0cf4adb6aa0bfccf675c938124e68f7f06349d (x86: Use __builtin_object_size() to validate the buffer size for copy_from_user()) Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/Kconfig.debug')
-rw-r--r--arch/sparc/Kconfig.debug14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
index 90d5fe223a74..9d3c889718ac 100644
--- 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.
+
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