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/*-
* Copyright (c) 2023 Dmitry Chagin <dchagin@FreeBSD.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <assert.h>
#include <libprocstat.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int checkstack(void);
#define _STACK_FLAG_GROWS (KVME_FLAG_GROWS_UP | KVME_FLAG_GROWS_DOWN)
int
checkstack(void)
{
struct kinfo_vmentry *freep, *kve;
struct kinfo_proc *p;
struct procstat *prstat;
uintptr_t stack;
int i, cnt;
prstat = procstat_open_sysctl();
assert(prstat != NULL);
p = procstat_getprocs(prstat, KERN_PROC_PID, getpid(), &cnt);
assert(p != NULL);
freep = procstat_getvmmap(prstat, p, &cnt);
assert(freep != NULL);
stack = (uintptr_t)&i;
for (i = 0; i < cnt; i++) {
kve = &freep[i];
if (stack < kve->kve_start || stack > kve->kve_end)
continue;
if ((kve->kve_flags & _STACK_FLAG_GROWS) != 0 &&
(kve->kve_protection & KVME_PROT_EXEC) != 0)
stack = 0;
break;
}
free(freep);
procstat_freeprocs(prstat, p);
procstat_close(prstat);
return (stack != 0);
}
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