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Commit e4dace36 authored by Florian Fainelli's avatar Florian Fainelli Committed by Linus Torvalds
Browse files

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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9888a588

lib/Kconfig.debug

+11 −0
Original line number Diff line number Diff line
@@ -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"

lib/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

lib/test_debug_virtual.c

0 → 100644
+49 −0
Original line number Diff line number Diff line 
#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");