| // SPDX-License-Identifier: GPL-2.0 |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <stdint.h> |
| #include <sys/prctl.h> |
| #include <sys/utsname.h> |
| |
| #define SHIFT_TAG(tag) ((uint64_t)(tag) << 56) |
| #define SET_TAG(ptr, tag) (((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \ |
| SHIFT_TAG(tag)) |
| |
| int main(void) |
| { |
| static int tbi_enabled = 0; |
| unsigned long tag = 0; |
| struct utsname *ptr; |
| int err; |
| |
| if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) |
| tbi_enabled = 1; |
| ptr = (struct utsname *)malloc(sizeof(*ptr)); |
| if (tbi_enabled) |
| tag = 0x42; |
| ptr = (struct utsname *)SET_TAG(ptr, tag); |
| err = uname(ptr); |
| free(ptr); |
| |
| return err; |
| } |