diff options
Diffstat (limited to 'lib/libc/sys/chmod.2')
| -rw-r--r-- | lib/libc/sys/chmod.2 | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/libc/sys/chmod.2 b/lib/libc/sys/chmod.2 index d573bfd85573..d4ba0cbc181e 100644 --- a/lib/libc/sys/chmod.2 +++ b/lib/libc/sys/chmod.2 @@ -30,7 +30,7 @@ .\" SUCH DAMAGE. .\" .\" @(#)chmod.2 8.1 (Berkeley) 6/4/93 -.\" $Id: chmod.2,v 1.9 1997/03/21 20:57:18 mpp Exp $ +.\" $Id: chmod.2,v 1.10 1997/08/17 00:19:28 steve Exp $ .\" .Dd June 4, 1993 .Dt CHMOD 2 @@ -112,6 +112,25 @@ permissions. For more details of the properties of the sticky bit, see .Xr sticky 8 . .Pp +If mode ISUID (set UID) is set on a directory, +and the MNT_SUIDDIR option was used in the mount of the filesystem, +then the owner of any new files and sub-directories +created within this directory are set +to be the same as the owner of that directory. +If this function is enabled, new directories will inherit +the bit from their parents. Execute bits are removed from +the file, and it will not be given to root. This behaviour does not change the +requirements for the user to be allowed to write the file, but only the eventual +owner after it has been created. Group inheritance is not effected. +.Pp +This feature is designed for use on fileservers serving PC users via +ftp, SAMBA, or netatalk. It provides security holes for shell users and as +such should not be used on shell machines, especially on home directories. +This option requires the SUIDDIR +option in the kernel to work. Only UFS filesystems support this option. +For more details of the suiddir mount option, see +.Xr mount 8 . +.Pp Writing or changing the owner of a file turns off the set-user-id and set-group-id bits unless the user is the super-user. |