diff options
| author | peter <peter@FreeBSD.org> | 1998-04-06 17:38:43 +0000 |
|---|---|---|
| committer | peter <peter@FreeBSD.org> | 1998-04-06 17:38:43 +0000 |
| commit | d5ab1c3759352a4180dfc28b7952eeb389bb3261 (patch) | |
| tree | fa41709ad0ad1c58a76febf3e0062c8b5641df9e /sys | |
| parent | 7c3222498acb0b317b49cca6311ffb697172d7ca (diff) | |
| download | FreeBSD-src-d5ab1c3759352a4180dfc28b7952eeb389bb3261.zip FreeBSD-src-d5ab1c3759352a4180dfc28b7952eeb389bb3261.tar.gz | |
Implement a new open(2) flag: O_NOFOLLOW. This will instruct open
to not follow symlinks, but to open a handle on the link itself(!).
As strange as this might sound, it has several useful applications
safe race-free ways of opening files in hostile areas (eg: /tmp, a mode
1777 /var/mail, etc). It also would allow things like fchown() to work
on the link rather than having to implement a new syscall specifically for
that task.
Reviewed by: phk
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/vfs_vnops.c | 5 | ||||
| -rw-r--r-- | sys/sys/fcntl.h | 3 |
2 files changed, 5 insertions, 3 deletions
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index d1e1b65..40a2112 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94 - * $Id: vfs_vnops.c,v 1.49 1998/02/06 12:13:33 eivind Exp $ + * $Id: vfs_vnops.c,v 1.50 1998/02/25 05:58:47 bde Exp $ */ #include <sys/param.h> @@ -118,7 +118,8 @@ vn_open(ndp, fmode, cmode) } } else { ndp->ni_cnd.cn_nameiop = LOOKUP; - ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF; + ndp->ni_cnd.cn_flags = + ((fmode & O_NOFOLLOW) ? NOFOLLOW : FOLLOW) | LOCKLEAF; error = namei(ndp); if (error) return (error); diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h index fa44125..7133e17 100644 --- a/sys/sys/fcntl.h +++ b/sys/sys/fcntl.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)fcntl.h 8.3 (Berkeley) 1/21/94 - * $Id$ + * $Id: fcntl.h,v 1.6 1997/02/22 09:45:13 peter Exp $ */ #ifndef _SYS_FCNTL_H_ @@ -84,6 +84,7 @@ #define O_EXLOCK 0x0020 /* open with exclusive file lock */ #define O_ASYNC 0x0040 /* signal pgrp when data ready */ #define O_FSYNC 0x0080 /* synchronous writes */ +#define O_NOFOLLOW 0x0100 /* don't follow symlinks */ #endif #define O_CREAT 0x0200 /* create if nonexistent */ #define O_TRUNC 0x0400 /* truncate to zero length */ |
