mischief/openbsd-src
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unveil of _PATH_DEVDB "/var/run/dev.db" can be done before pledge for

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use by ttyname, no other files are accessed after that.
This commit is contained in:
deraadt 2018-08-03 06:55:41 +00:00
parent 4d5b013993
commit ed3a953df5
1 changed files with 7 additions and 4 deletions
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11
usr.bin/tty/tty.c
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@ -1,4 +1,4 @@
/* $OpenBSD: tty.c,v 1.10 2015/10/12 19:56:47 naddy Exp $ */
/* $OpenBSD: tty.c,v 1.11 2018/08/03 06:55:41 deraadt Exp $ */
/* $NetBSD: tty.c,v 1.4 1994/12/07 00:46:57 jtc Exp $ */
/*
@ -33,6 +33,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <paths.h>
#include <err.h>
static void usage(void);
@ -43,9 +44,6 @@ main(int argc, char *argv[])
int ch, sflag;
char *t;
if (pledge("stdio rpath", NULL) == -1)
err(1, "pledge");
sflag = 0;
while ((ch = getopt(argc, argv, "s")) != -1) {
switch(ch) {
@ -59,6 +57,11 @@ main(int argc, char *argv[])
}
}
if (unveil(_PATH_DEVDB, "r") == -1)
err(1, "unveil");
if (pledge("stdio rpath", NULL) == -1)
err(1, "pledge");
t = ttyname(STDIN_FILENO);
if (!sflag)
puts(t ? t : "not a tty");