The patch titled
Subject: lib: add test module for CONFIG_DEBUG_VIRTUAL
has been added to the -mm tree. Its filename is
lib-add-test-module-for-config_debug_virtual.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-add-test-module-for-config_debug_virtual.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-add-test-module-for-config_debug_virtual.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Florian Fainelli <f.fainelli@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 11 ++++++++
lib/Makefile | 1
lib/test_debug_virtual.c | 49 +++++++++++++++++++++++++++++++++++++
3 files changed, 61 insertions(+)
diff -puN lib/Kconfig.debug~lib-add-test-module-for-config_debug_virtual lib/Kconfig.debug
--- a/lib/Kconfig.debug~lib-add-test-module-for-config_debug_virtual
+++ a/lib/Kconfig.debug
@@ -1902,6 +1902,17 @@ 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 -puN lib/Makefile~lib-add-test-module-for-config_debug_virtual lib/Makefile
--- a/lib/Makefile~lib-add-test-module-for-config_debug_virtual
+++ a/lib/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_TEST_BITMAP) += test_bitmap
obj-$(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 -puN /dev/null lib/test_debug_virtual.c
--- /dev/null
+++ a/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");
_
Patches currently in -mm which might be from f.fainelli@xxxxxxxxx are
lib-add-test-module-for-config_debug_virtual.patch
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