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o Update extattrctl.8 to reflect new initattr -p, -r, and -w options.

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o Update extattrctl.c to default new attributes to readable and writable
  only by the kernel and root user.  Previously the default was to allow
  the file owner to directory view and manipulate the attributes, which
  is probably an inappropriate default.
This commit is contained in:
Robert Watson 2000-04-20 20:32:43 +00:00
parent 2a60effdd8
commit 6c50ada1bd
2 changed files with 41 additions and 4 deletions
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41
usr.sbin/extattrctl/extattrctl.8
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@ -71,12 +71,47 @@ option must have been enabled.
Stop extended attribute support on the file system named using
.Ar path .
Extended attribute support must previously have been started.
.It Cm initattr Ar attrsize Ar attrfile
.It Xo
.Cm initattr
.Op Fl p Ar path
.Op Fl r Op Ar kroa
.Op Fl w Op Ar kroa
.Ar attrsize attrfile
.Xc
Create and initialize a file to use as an attribute backing file.
You must specify a maximum per-inode size for the attribute in bytes in
.Ar attrsize ,
as well as the file where the attribute will be stored, using
.Ar attrfile .
.Pp
The
.Fl p Ar path
argument may be used to preallocate space for all attributes rather than
relying on sparse files to conserve space.
This has the advantage of guaranteeing that space will be available
for attributes when they are written, preventing low disk space conditions
from denying attribute service.
.Pp
The
.Fl r
and
.Fl w
options can be used to set the read and write permissions on the named
attribute, respectively.
There are four levels possible for both read and write:
.Dq k
limits reading or writing to the kernel,
.Dq r
limits activities to root,
.Dq o
limits activities to root and the owner of the file having the attribute
read or written, and
.Dq q
allows any user to perform the attribute operation.
The default is to limit activities to the root user, or
.Dq r
.
.Pp
This file should not exist before running
.Cm initattr.
.It Cm enable Ar path Ar attrname Ar attrfile
@ -108,7 +143,9 @@ Start extended attributes on the root file system.
.Dl extattrctl initattr 17 /.attribute/md5
.Pp
Create an attribute backing file in /.attribute/md5, and set the maximum
size of each attribute to 17 bytes.
size of each attribute to 17 bytes. Sparse files are used for storing the
attributes, and the default permissions limiting access to the root user
are implied.
.Pp
.Dl extattrctl enable / md5 /.attribute/md5
.Pp

4
usr.sbin/extattrctl/extattrctl.c
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@ -111,8 +111,8 @@ initattr(int argc, char *argv[])
char *fs_path = NULL;
char *zero_buf = NULL;
long loop, num_inodes;
int initattr_rlevel = UFS_EXTATTR_PERM_OWNER;
int initattr_wlevel = UFS_EXTATTR_PERM_OWNER;
int initattr_rlevel = UFS_EXTATTR_PERM_ROOT;
int initattr_wlevel = UFS_EXTATTR_PERM_ROOT;
int ch, i, error;
optind = 0;