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Provide a helpful error message if we don't have privs to read kernel 

addresses.
This commit is contained in:
christos 2020-08-26 23:08:29 +00:00
parent 0ef96ddde1
commit f55490be1e
1 changed files with 22 additions and 2 deletions
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24
usr.bin/fstat/fstat.c
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@ -1,4 +1,4 @@
/* $NetBSD: fstat.c,v 1.113 2019/09/06 17:08:22 christos Exp $ */
/* $NetBSD: fstat.c,v 1.114 2020/08/26 23:08:29 christos Exp $ */
/*-
* Copyright (c) 1988, 1993
@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
#if 0
static char sccsid[] = "@(#)fstat.c 8.3 (Berkeley) 5/2/95";
#else
__RCSID("$NetBSD: fstat.c,v 1.113 2019/09/06 17:08:22 christos Exp $");
__RCSID("$NetBSD: fstat.c,v 1.114 2020/08/26 23:08:29 christos Exp $");
#endif
#endif /* not lint */
@ -181,6 +181,7 @@ static void vtrans(struct file *, struct vnode *, int, int, long);
static void ftrans(fdfile_t *, int);
static void ptrans(struct file *, struct pipe *, int);
static void kdriver_init(void);
static void check_privs(void);
int
main(int argc, char **argv)
@ -244,6 +245,8 @@ main(int argc, char **argv)
usage();
}
check_privs();
kdriver_init();
if (*(argv += optind)) {
@ -309,6 +312,23 @@ main(int argc, char **argv)
return 0;
}
static void
check_privs(void)
{
int expaddr;
size_t expsize = sizeof(expaddr);
const char *expname = "kern.expose_address";
if (geteuid() == 0)
return;
if (sysctlbyname(expname, &expaddr, &expsize, NULL, 0) == -1)
err(EXIT_FAILURE, "Can't get sysctl `%s'", expname);
if (expaddr == 0)
errx(EXIT_FAILURE, "This program does not work without "
"sysctl `%s' being set", expname);
}
static const char *Uname, *Comm;
pid_t Pid;