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Make sure we pass the length - 1 to readlink, since it adds its own

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NUL at the end of the path.
Inspired by: OpenBSD's changes in this area by theo de raadt
This commit is contained in:
Warner Losh 1998-06-09 03:38:43 +00:00
parent 39b14624c5
commit e00e592a7a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=36784
3 changed files with 8 additions and 10 deletions
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4
bin/cp/utils.c
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@ -36,7 +36,7 @@
static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
#endif
static const char rcsid[] =
"$Id: utils.c,v 1.17 1998/05/06 06:50:25 charnier Exp $";
"$Id: utils.c,v 1.18 1998/05/13 07:25:17 charnier Exp $";
#endif /* not lint */
#include <sys/param.h>
@ -208,7 +208,7 @@ copy_link(p, exists)
int len;
char link[MAXPATHLEN];
if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) {
if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) {
warn("readlink: %s", p->fts_path);
return (1);
}

8
bin/csh/dir.c
View File

@ -36,7 +36,7 @@
static char sccsid[] = "@(#)dir.c 8.1 (Berkeley) 5/31/93";
#else
static const char rcsid[] =
"$Id: dir.c,v 1.6 1997/02/22 14:01:42 peter Exp $";
"$Id: dir.c,v 1.7 1997/08/07 21:42:05 steve Exp $";
#endif
#endif /* not lint */
@ -705,8 +705,7 @@ dcanon(cp, p)
*/
*--sp = 0; /* form the pathname for readlink */
if (sp != cp && !adrof(STRignore_symlinks) &&
(cc = readlink(short2str(cp), tlink,
sizeof tlink)) >= 0) {
(cc = readlink(short2str(cp), tlink, sizeof(tlink) - 1)) >= 0) {
(void) Strcpy(link, str2short(tlink));
link[cc] = '\0';
@ -790,8 +789,7 @@ dcanon(cp, p)
if (sp != cp && adrof(STRchase_symlinks) &&
!adrof(STRignore_symlinks) &&
(cc = readlink(short2str(cp), tlink,
sizeof tlink)) >= 0) {
(cc = readlink(short2str(cp), tlink, sizeof(tlink) - 1)) >= 0) {
(void) Strcpy(link, str2short(tlink));
link[cc] = '\0';

6
bin/pax/ftree.c
View File

@ -40,7 +40,7 @@
static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94";
#endif
static const char rcsid[] =
"$Id$";
"$Id: ftree.c,v 1.10 1998/05/15 06:27:42 charnier Exp $";
#endif /* not lint */
#include <sys/types.h>
@ -508,14 +508,14 @@ next_file(arcn)
* have to read the symlink path from the file
*/
if ((cnt = readlink(ftent->fts_path, arcn->ln_name,
PAXPATHLEN)) < 0) {
PAXPATHLEN - 1)) < 0) {
sys_warn(1, errno, "Unable to read symlink %s",
ftent->fts_path);
continue;
}
/*
* set link name length, watch out readlink does not
* allways null terminate the link path
* allways NUL terminate the link path
*/
arcn->ln_name[cnt] = '\0';
arcn->ln_nlen = cnt;