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Commit 9ae113ce authored by Kees Cook's avatar Kees Cook Committed by Greg Kroah-Hartman
Browse files

lkdtm: add tests for additional page permissions 



Testing execution and access of userspace from the kernel is needed for
validating things like Intel's SMEP and SMAP protections. Additionally,
add an explicit test for validating that RO page permissions have been
set for the RO data area.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7d196ac3

drivers/misc/lkdtm.c

+61 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ 
#include <scsi/scsi_cmnd.h>

#include <linux/debugfs.h>

#include <linux/vmalloc.h>

#include <linux/mman.h>



#ifdef CONFIG_IDE

#include <linux/ide.h>
@@ -97,6 +98,9 @@ enum ctype { 
	CT_EXEC_STACK,

	CT_EXEC_KMALLOC,

	CT_EXEC_VMALLOC,

	CT_EXEC_USERSPACE,

	CT_ACCESS_USERSPACE,

	CT_WRITE_RO,

};



static char* cp_name[] = {
@@ -130,6 +134,9 @@ static char* cp_type[] = { 
	"EXEC_STACK",

	"EXEC_KMALLOC",

	"EXEC_VMALLOC",

	"EXEC_USERSPACE",

	"ACCESS_USERSPACE",

	"WRITE_RO",

};



static struct jprobe lkdtm;
@@ -150,6 +157,8 @@ static DEFINE_SPINLOCK(lock_me_up); 


static u8 data_area[EXEC_SIZE];



static const unsigned long rodata = 0xAA55AA55;



module_param(recur_count, int, 0644);

MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test");

module_param(cpoint_name, charp, 0444);
@@ -323,6 +332,15 @@ static void execute_location(void *dst) 
	func();

}



static void execute_user_location(void *dst)

{

	void (*func)(void) = dst;



	if (copy_to_user(dst, do_nothing, EXEC_SIZE))

		return;

	func();

}



static void lkdtm_do_action(enum ctype which)

{

	switch (which) {
@@ -415,6 +433,49 @@ static void lkdtm_do_action(enum ctype which) 
		vfree(vmalloc_area);

		break;

	}

	case CT_EXEC_USERSPACE: {

		unsigned long user_addr;



		user_addr = vm_mmap(NULL, 0, PAGE_SIZE,

				    PROT_READ | PROT_WRITE | PROT_EXEC,

				    MAP_ANONYMOUS | MAP_PRIVATE, 0);

		if (user_addr >= TASK_SIZE) {

			pr_warn("Failed to allocate user memory\n");

			return;

		}

		execute_user_location((void *)user_addr);

		vm_munmap(user_addr, PAGE_SIZE);

		break;

	}

	case CT_ACCESS_USERSPACE: {

		unsigned long user_addr, tmp;

		unsigned long *ptr;



		user_addr = vm_mmap(NULL, 0, PAGE_SIZE,

				    PROT_READ | PROT_WRITE | PROT_EXEC,

				    MAP_ANONYMOUS | MAP_PRIVATE, 0);

		if (user_addr >= TASK_SIZE) {

			pr_warn("Failed to allocate user memory\n");

			return;

		}



		ptr = (unsigned long *)user_addr;

		tmp = *ptr;

		tmp += 0xc0dec0de;

		*ptr = tmp;



		vm_munmap(user_addr, PAGE_SIZE);



		break;

	}

	case CT_WRITE_RO: {

		unsigned long *ptr;



		ptr = (unsigned long *)&rodata;

		*ptr ^= 0xabcd1234;



		break;

	}

	case CT_NONE:

	default:

		break;