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authorStephen Smalley <sds@tycho.nsa.gov>2005-09-03 15:55:18 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:05:52 -0700
commitf549d6c18c0e8e6cf1bf0e7a47acc1daf7e2cec1 (patch)
tree40d827736575f2a8c489761599e9a1e5e45005be /fs/devpts
parentb5bf6c55edf94e9c7fc01724d5b271f78eaf1d3f (diff)
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[PATCH] Generic VFS fallback for security xattrs
This patch modifies the VFS setxattr, getxattr, and listxattr code to fall back to the security module for security xattrs if the filesystem does not support xattrs natively. This allows security modules to export the incore inode security label information to userspace even if the filesystem does not provide xattr storage, and eliminates the need to individually patch various pseudo filesystem types to provide such access. The patch removes the existing xattr code from devpts and tmpfs as it is then no longer needed. The patch restructures the code flow slightly to reduce duplication between the normal path and the fallback path, but this should only have one user-visible side effect - a program may get -EACCES rather than -EOPNOTSUPP if policy denied access but the filesystem didn't support the operation anyway. Note that the post_setxattr hook call is not needed in the fallback case, as the inode_setsecurity hook call handles the incore inode security state update directly. In contrast, we do call fsnotify in both cases. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/devpts')
-rw-r--r--fs/devpts/Makefile1
-rw-r--r--fs/devpts/inode.c21
-rw-r--r--fs/devpts/xattr_security.c47
3 files changed, 0 insertions, 69 deletions
diff --git a/fs/devpts/Makefile b/fs/devpts/Makefile
index 5800df2..236696e 100644
--- a/fs/devpts/Makefile
+++ b/fs/devpts/Makefile
@@ -5,4 +5,3 @@
obj-$(CONFIG_UNIX98_PTYS) += devpts.o
devpts-$(CONFIG_UNIX98_PTYS) := inode.o
-devpts-$(CONFIG_DEVPTS_FS_SECURITY) += xattr_security.o
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 1571c8d..f2be44d 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -18,28 +18,9 @@
#include <linux/mount.h>
#include <linux/tty.h>
#include <linux/devpts_fs.h>
-#include <linux/xattr.h>
#define DEVPTS_SUPER_MAGIC 0x1cd1
-extern struct xattr_handler devpts_xattr_security_handler;
-
-static struct xattr_handler *devpts_xattr_handlers[] = {
-#ifdef CONFIG_DEVPTS_FS_SECURITY
- &devpts_xattr_security_handler,
-#endif
- NULL
-};
-
-static struct inode_operations devpts_file_inode_operations = {
-#ifdef CONFIG_DEVPTS_FS_XATTR
- .setxattr = generic_setxattr,
- .getxattr = generic_getxattr,
- .listxattr = generic_listxattr,
- .removexattr = generic_removexattr,
-#endif
-};
-
static struct vfsmount *devpts_mnt;
static struct dentry *devpts_root;
@@ -102,7 +83,6 @@ devpts_fill_super(struct super_block *s, void *data, int silent)
s->s_blocksize_bits = 10;
s->s_magic = DEVPTS_SUPER_MAGIC;
s->s_op = &devpts_sops;
- s->s_xattr = devpts_xattr_handlers;
s->s_time_gran = 1;
inode = new_inode(s);
@@ -175,7 +155,6 @@ int devpts_pty_new(struct tty_struct *tty)
inode->i_gid = config.setgid ? config.gid : current->fsgid;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
init_special_inode(inode, S_IFCHR|config.mode, device);
- inode->i_op = &devpts_file_inode_operations;
inode->u.generic_ip = tty;
dentry = get_node(number);
diff --git a/fs/devpts/xattr_security.c b/fs/devpts/xattr_security.c
deleted file mode 100644
index 864cb5c..0000000
--- a/fs/devpts/xattr_security.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Security xattr support for devpts.
- *
- * Author: Stephen Smalley <sds@epoch.ncsc.mil>
- * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- */
-#include <linux/string.h>
-#include <linux/fs.h>
-#include <linux/security.h>
-#include <linux/xattr.h>
-
-static size_t
-devpts_xattr_security_list(struct inode *inode, char *list, size_t list_len,
- const char *name, size_t name_len)
-{
- return security_inode_listsecurity(inode, list, list_len);
-}
-
-static int
-devpts_xattr_security_get(struct inode *inode, const char *name,
- void *buffer, size_t size)
-{
- if (strcmp(name, "") == 0)
- return -EINVAL;
- return security_inode_getsecurity(inode, name, buffer, size);
-}
-
-static int
-devpts_xattr_security_set(struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
-{
- if (strcmp(name, "") == 0)
- return -EINVAL;
- return security_inode_setsecurity(inode, name, value, size, flags);
-}
-
-struct xattr_handler devpts_xattr_security_handler = {
- .prefix = XATTR_SECURITY_PREFIX,
- .list = devpts_xattr_security_list,
- .get = devpts_xattr_security_get,
- .set = devpts_xattr_security_set,
-};