mte-5.c (1095B)
1/* 2 * Memory tagging, faulting unaligned access. 3 * 4 * Copyright (c) 2021 Linaro Ltd 5 * SPDX-License-Identifier: GPL-2.0-or-later 6 */ 7 8#include "mte.h" 9 10void pass(int sig, siginfo_t *info, void *uc) 11{ 12 assert(info->si_code == SEGV_MTESERR); 13 exit(0); 14} 15 16int main(int ac, char **av) 17{ 18 struct sigaction sa; 19 void *p0, *p1, *p2; 20 long excl = 1; 21 22 enable_mte(PR_MTE_TCF_SYNC); 23 p0 = alloc_mte_mem(sizeof(*p0)); 24 25 /* Create two differently tagged pointers. */ 26 asm("irg %0,%1,%2" : "=r"(p1) : "r"(p0), "r"(excl)); 27 asm("gmi %0,%1,%0" : "+r"(excl) : "r" (p1)); 28 assert(excl != 1); 29 asm("irg %0,%1,%2" : "=r"(p2) : "r"(p0), "r"(excl)); 30 assert(p1 != p2); 31 32 memset(&sa, 0, sizeof(sa)); 33 sa.sa_sigaction = pass; 34 sa.sa_flags = SA_SIGINFO; 35 sigaction(SIGSEGV, &sa, NULL); 36 37 /* Store store two different tags in sequential granules. */ 38 asm("stg %0, [%0]" : : "r"(p1)); 39 asm("stg %0, [%0]" : : "r"(p2 + 16)); 40 41 /* Perform an unaligned load crossing the granules. */ 42 asm volatile("ldr %0, [%1]" : "=r"(p0) : "r"(p1 + 12)); 43 abort(); 44}