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Set our uid and gid to the effective user and group id's of the current

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process so that access(2) DTRT's (from Peter Postma).
This commit is contained in:
christos 2004-04-01 22:14:48 +00:00
parent 8afe56f1c5
commit 54c7540419
1 changed files with 10 additions and 3 deletions
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13
usr.bin/whereis/whereis.c
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@ -1,4 +1,4 @@
/* $NetBSD: whereis.c,v 1.15 2004/04/01 21:41:14 christos Exp $ */ /* $NetBSD: whereis.c,v 1.16 2004/04/01 22:14:48 christos Exp $ */
/*- /*-
* Copyright (c) 1993 * Copyright (c) 1993
@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1993\n\
#if 0 #if 0
static char sccsid[] = "@(#)whereis.c 8.3 (Berkeley) 5/4/95"; static char sccsid[] = "@(#)whereis.c 8.3 (Berkeley) 5/4/95";
#endif #endif
__RCSID("$NetBSD: whereis.c,v 1.15 2004/04/01 21:41:14 christos Exp $"); __RCSID("$NetBSD: whereis.c,v 1.16 2004/04/01 22:14:48 christos Exp $");
#endif /* not lint */ #endif /* not lint */
#include <sys/param.h> #include <sys/param.h>
@ -65,6 +65,14 @@ main(int argc, char *argv[])
const char *t; const char *t;
int which = strcmp(getprogname(), "which") == 0; int which = strcmp(getprogname(), "which") == 0;
int useenvpath = which, found = 0; int useenvpath = which, found = 0;
gid_t egid = getegid();
uid_t euid = geteuid();
/* To make access(2) do what we want */
if (setgid(egid) == -1)
err(1, "Can't set gid to %lu", (unsigned long)egid);
if (setuid(euid) == -1)
err(1, "Can't set uid to %lu", (unsigned long)euid);
while ((ch = getopt(argc, argv, "ap")) != -1) while ((ch = getopt(argc, argv, "ap")) != -1)
switch (ch) { switch (ch) {
@ -112,7 +120,6 @@ main(int argc, char *argv[])
t = "."; t = ".";
} else } else
if (strlen(t) == 0) if (strlen(t) == 0)
/*###114 [cc] warning: assignment discards qualifiers from pointer target type%%%*/
t = "."; t = ".";
(void)snprintf(path, sizeof(path), "%s/%s", t, *argv); (void)snprintf(path, sizeof(path), "%s/%s", t, *argv);
if (stat(path, &sb) == -1) if (stat(path, &sb) == -1)