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Just like in mesg(1) in biff(1) we just need to push down pledge(2) a little

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bit to get the tty name. After this we can unveil(2) the tty with rw access in
order to stat(2)/chmod(2) it, once this is done we can put back the same
pledge(2) just right afterwards.

OK deraadt@
This commit is contained in:
mestre 2018-08-11 10:59:34 +00:00
parent 710042728a
commit 0303d6a701
1 changed files with 6 additions and 4 deletions
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10
usr.bin/biff/biff.c
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@ -1,4 +1,4 @@
/* $OpenBSD: biff.c,v 1.15 2016/07/07 09:26:25 semarie Exp $ */
/* $OpenBSD: biff.c,v 1.16 2018/08/11 10:59:34 mestre Exp $ */
/* $NetBSD: biff.c,v 1.3 1995/03/26 02:34:22 glass Exp $ */
/*
@ -49,9 +49,6 @@ main(int argc, char *argv[])
int ch;
char *name;
if (pledge("stdio rpath fattr", NULL) == -1)
err(2, "pledge");
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
@ -64,6 +61,11 @@ main(int argc, char *argv[])
if ((name = ttyname(STDERR_FILENO)) == NULL)
err(2, "tty");
if (unveil(name, "rw") == -1)
err(2, "unveil");
if (pledge("stdio rpath fattr", NULL) == -1)
err(2, "pledge");
if (stat(name, &sb))
err(2, "stat");