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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 /tools
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 'tools')
-rw-r--r--tools/testing/selftests/Makefile1
-rw-r--r--tools/testing/selftests/user/Makefile13
2 files changed, 14 insertions, 0 deletions
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 9f3eae290900..32487ed18354 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -9,6 +9,7 @@ TARGETS += ptrace
TARGETS += timers
TARGETS += vm
TARGETS += powerpc
+TARGETS += user
all:
for TARGET in $(TARGETS); do \
diff --git a/tools/testing/selftests/user/Makefile b/tools/testing/selftests/user/Makefile
new file mode 100644
index 000000000000..396255bd720e
--- /dev/null
+++ b/tools/testing/selftests/user/Makefile
@@ -0,0 +1,13 @@
+# Makefile for user memory selftests
+
+# No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
+all:
+
+run_tests: all
+ @if /sbin/modprobe test_user_copy ; then \
+ rmmod test_user_copy; \
+ echo "user_copy: ok"; \
+ else \
+ echo "user_copy: [FAIL]"; \
+ exit 1; \
+ fi