| 1 | #include "mte.h" |
| 2 | |
| 3 | void pass(int sig, siginfo_t *info, void *uc) |
| 4 | { |
| 5 | assert(info->si_code == SEGV_MTESERR); |
| 6 | exit(0); |
| 7 | } |
| 8 | |
| 9 | int main(void) |
| 10 | { |
| 11 | enable_mte(PR_MTE_TCF_SYNC); |
| 12 | |
| 13 | void *brk = sbrk(16); |
| 14 | if (brk == (void *)-1) { |
| 15 | perror("sbrk"); |
| 16 | return 2; |
| 17 | } |
| 18 | |
| 19 | if (mprotect(brk, 16, PROT_READ | PROT_WRITE | PROT_MTE)) { |
| 20 | perror("mprotect"); |
| 21 | return 2; |
| 22 | } |
| 23 | |
| 24 | int *p1, *p2; |
| 25 | long excl = 1; |
| 26 | |
| 27 | asm("irg %0,%1,%2" : "=r"(p1) : "r"(brk), "r"(excl)); |
| 28 | asm("gmi %0,%1,%0" : "+r"(excl) : "r"(p1)); |
| 29 | asm("irg %0,%1,%2" : "=r"(p2) : "r"(brk), "r"(excl)); |
| 30 | asm("stg %0,[%0]" : : "r"(p1)); |
| 31 | |
| 32 | *p1 = 0; |
| 33 | |
| 34 | struct sigaction sa; |
| 35 | memset(&sa, 0, sizeof(sa)); |
| 36 | sa.sa_sigaction = pass; |
| 37 | sa.sa_flags = SA_SIGINFO; |
| 38 | sigaction(SIGSEGV, &sa, NULL); |
| 39 | |
| 40 | *p2 = 0; |
| 41 | |
| 42 | abort(); |
| 43 | } |