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authorKees Cook <keescook@chromium.org>2014-01-24 03:54:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-24 04:36:57 +0400
commit3e2a4c183ace8708c69f589505fb82bb63010ade (patch)
treee201c3d60f39bbe3ba5026417d454553ad2fe073 /lib/Kconfig.debug
parent93e9ef83f40603535ffe6b60498149e75f33aa8f (diff)
downloadlinux-3e2a4c183ace8708c69f589505fb82bb63010ade.tar.xz
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 <keescook@chromium.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug13
1 files changed, 13 insertions, 0 deletions
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"