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// SPDX-License-Identifier: GPL-2.0
/*
* This is for all the tests relating directly to Control Flow Integrity.
*/
#include "lkdtm.h"
static int called_count;
/* Function taking one argument, without a return value. */
static noinline void lkdtm_increment_void(int *counter)
{
(*counter)++;
}
/* Function taking one argument, returning int. */
static noinline int lkdtm_increment_int(int *counter)
{
(*counter)++;
return *counter;
}
/*
* This tries to call an indirect function with a mismatched prototype.
*/
void lkdtm_CFI_FORWARD_PROTO(void)
{
/*
* Matches lkdtm_increment_void()'s prototype, but not
* lkdtm_increment_int()'s prototype.
*/
void (*func)(int *);
pr_info("Calling matched prototype ...\n");
func = lkdtm_increment_void;
func(&called_count);
pr_info("Calling mismatched prototype ...\n");
func = (void *)lkdtm_increment_int;
func(&called_count);
pr_info("Fail: survived mismatched prototype function call!\n");
}
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