From 3e2a4c183ace8708c69f589505fb82bb63010ade Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 23 Jan 2014 15:54:38 -0800 Subject: test: check copy_to/from_user boundary validation To help avoid an architecture failing to correctly check kernel/user boundaries when handling copy_to_user, copy_from_user, put_user, or get_user, perform some simple tests and fail to load if any of them behave unexpectedly. Specifically, this is to make sure there is a way to notice if things like what was fixed in commit 8404663f81d2 ("ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS") ever regresses again, for any architecture. Additionally, adds new "user" selftest target, which loads this module. Signed-off-by: Kees Cook Cc: Rusty Russell Cc: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/Kconfig.debug | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'lib/Kconfig.debug') diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 7e37a36b6913..e0e2eebf7ab3 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1609,6 +1609,19 @@ config TEST_MODULE If unsure, say N. +config TEST_USER_COPY + tristate "Test user/kernel boundary protections" + default n + depends on m + help + This builds the "test_user_copy" module that runs sanity checks + on the copy_to/from_user infrastructure, making sure basic + user/kernel boundary testing is working. If it fails to load, + a regression has been detected in the user/kernel memory boundary + protections. + + If unsure, say N. + source "samples/Kconfig" source "lib/Kconfig.kgdb" -- cgit v1.2.1