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// 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;
}
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