Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * This is for all the tests relating directly to Control Flow Integrity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "lkdtm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static int called_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) /* Function taking one argument, without a return value. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) static noinline void lkdtm_increment_void(int *counter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	(*counter)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /* Function taking one argument, returning int. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static noinline int lkdtm_increment_int(int *counter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	(*counter)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	return *counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * This tries to call an indirect function with a mismatched prototype.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) void lkdtm_CFI_FORWARD_PROTO(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	 * Matches lkdtm_increment_void()'s prototype, but not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	 * lkdtm_increment_int()'s prototype.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	void (*func)(int *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	pr_info("Calling matched prototype ...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	func = lkdtm_increment_void;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	func(&called_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	pr_info("Calling mismatched prototype ...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	func = (void *)lkdtm_increment_int;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	func(&called_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	pr_info("Fail: survived mismatched prototype function call!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }