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authorFlorian Fainelli <f.fainelli@gmail.com>2017-09-08 16:15:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:49 -0700
commite4dace3615526fd66c86dd535ee4bc9e8c706e37 (patch)
tree48e3720ba8cebfba4d4c3ed753025a1854b9a758
parent9888a588ea96ba2804f955bbc2667346719da887 (diff)
lib: add test module for CONFIG_DEBUG_VIRTUAL
Add a test module that allows testing that CONFIG_DEBUG_VIRTUAL works correctly, at least that it can catch invalid calls to virt_to_phys() against the non-linear kernel virtual address map. Link: http://lkml.kernel.org/r/20170808164035.26725-1-f.fainelli@gmail.com Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/Kconfig.debug11
-rw-r--r--lib/Makefile1
-rw-r--r--lib/test_debug_virtual.c49
3 files changed, 61 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7396f5044397..b19c491cbc4e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1930,6 +1930,17 @@ config TEST_KMOD
If unsure, say N.
+config TEST_DEBUG_VIRTUAL
+ tristate "Test CONFIG_DEBUG_VIRTUAL feature"
+ depends on DEBUG_VIRTUAL
+ help
+ Test the kernel's ability to detect incorrect calls to
+ virt_to_phys() done against the non-linear part of the
+ kernel's virtual address map.
+
+ If unsure, say N.
+
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"
diff --git a/lib/Makefile b/lib/Makefile
index 40c18372b301..469ce5e24e4f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
obj-$(CONFIG_TEST_UUID) += test_uuid.o
obj-$(CONFIG_TEST_PARMAN) += test_parman.o
obj-$(CONFIG_TEST_KMOD) += test_kmod.o
+obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/test_debug_virtual.c b/lib/test_debug_virtual.c
new file mode 100644
index 000000000000..b9cdeecc19dc
--- /dev/null
+++ b/lib/test_debug_virtual.c
@@ -0,0 +1,49 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/sizes.h>
+
+#include <asm/page.h>
+#ifdef CONFIG_MIPS
+#include <asm/bootinfo.h>
+#endif
+
+struct foo {
+ unsigned int bar;
+};
+
+struct foo *foo;
+
+static int __init test_debug_virtual_init(void)
+{
+ phys_addr_t pa;
+ void *va;
+
+ va = (void *)VMALLOC_START;
+ pa = virt_to_phys(va);
+
+ pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
+
+ foo = kzalloc(sizeof(*foo), GFP_KERNEL);
+ if (!foo)
+ return -ENOMEM;
+
+ pa = virt_to_phys(foo);
+ va = foo;
+ pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
+
+ return 0;
+}
+module_init(test_debug_virtual_init);
+
+static void __exit test_debug_virtual_exit(void)
+{
+ kfree(foo);
+}
+module_exit(test_debug_virtual_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");