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lib: add test module for CONFIG_DEBUG_VIRTUAL

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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>
This commit is contained in:
Florian Fainelli 2017-09-08 16:15:31 -07:00 committed by Linus Torvalds
parent 9888a588ea
commit e4dace3615
3 changed files with 61 additions and 0 deletions
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11
lib/Kconfig.debug
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@ -1930,6 +1930,17 @@ config TEST_KMOD
If unsure, say N. 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 "samples/Kconfig"
source "lib/Kconfig.kgdb" source "lib/Kconfig.kgdb"

1
lib/Makefile
View File

@ -62,6 +62,7 @@ obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
obj-$(CONFIG_TEST_UUID) += test_uuid.o obj-$(CONFIG_TEST_UUID) += test_uuid.o
obj-$(CONFIG_TEST_PARMAN) += test_parman.o obj-$(CONFIG_TEST_PARMAN) += test_parman.o
obj-$(CONFIG_TEST_KMOD) += test_kmod.o obj-$(CONFIG_TEST_KMOD) += test_kmod.o
obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y) ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG CFLAGS_kobject.o += -DDEBUG

49
lib/test_debug_virtual.c Normal file
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@ -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");