[PATCH 1/2] kill attr_capable callbacks

Christoph Hellwig
2008-04-30T11:22:10Z

No need for addition permission checks in the xattr handler,
fs/xattr.c:xattr_permission() already does them, and in fact slightly
more strict then what was in the attr_capable handlers.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_iops.c 2008-04-29 21:32:56.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c 2008-04-29 21:33:30.000000000 +0200
@@ -747,15 +747,11 @@ xfs_vn_setxattr(
char *attr = (char *)name;
attrnames_t *namesp;
int xflags = 0;
- int error;

namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
if (!namesp)
return -EOPNOTSUPP;
attr += namesp->attr_namelen;
- error = namesp->attr_capable(vp, NULL);
- if (error)
- return error;

/* Convert Linux syscall to XFS internal ATTR flags */
if (flags & XATTR_CREATE)
@@ -777,15 +773,11 @@ xfs_vn_getxattr(
char *attr = (char *)name;
attrnames_t *namesp;
int xflags = 0;
- ssize_t error;

namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
if (!namesp)
return -EOPNOTSUPP;
attr += namesp->attr_namelen;
- error = namesp->attr_capable(vp, NULL);
- if (error)
- return error;

/* Convert Linux syscall to XFS internal ATTR flags */
if (!size) {
@@ -825,15 +817,12 @@ xfs_vn_removexattr(
char *attr = (char *)name;
attrnames_t *namesp;
int xflags = 0;
- int error;

namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
if (!namesp)
return -EOPNOTSUPP;
attr += namesp->attr_namelen;
- error = namesp->attr_capable(vp, NULL);
- if (error)
- return error;
+
xflags |= namesp->attr_flag;
return namesp->attr_remove(vp, attr, xflags);
}
Index: linux-2.6-xfs/fs/xfs/xfs_attr.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_attr.c 2008-04-29 21:32:25.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_attr.c 2008-04-29 21:32:51.000000000 +0200
@@ -2622,43 +2622,6 @@ attr_lookup_namespace(
return NULL;
}

-/*
- * Some checks to prevent people abusing EAs to get over quota:
- * - Don't allow modifying user EAs on devices/symlinks;
- * - Don't allow modifying user EAs if sticky bit set;
- */
-STATIC int
-attr_user_capable(
- bhv_vnode_t *vp,
- cred_t *cred)
-{
- struct inode *inode = vn_to_inode(vp);
-
- if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- return -EPERM;
- if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
- (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
- return -EPERM;
- return 0;
-}
-
-STATIC int
-attr_trusted_capable(
- bhv_vnode_t *vp,
- cred_t *cred)
-{
- struct inode *inode = vn_to_inode(vp);
-
- if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- return -EPERM;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- return 0;
-}
-
STATIC int
attr_system_set(
bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
@@ -2709,7 +2672,6 @@ struct attrnames attr_system = {
.attr_get = attr_system_get,
.attr_set = attr_system_set,
.attr_remove = attr_system_remove,
- .attr_capable = (attrcapable_t)fs_noerr,
};

struct attrnames attr_trusted = {
@@ -2719,7 +2681,6 @@ struct attrnames attr_trusted = {
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
- .attr_capable = attr_trusted_capable,
};

struct attrnames attr_secure = {
@@ -2729,7 +2690,6 @@ struct attrnames attr_secure = {
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
- .attr_capable = (attrcapable_t)fs_noerr,
};

struct attrnames attr_user = {
@@ -2738,7 +2698,6 @@ struct attrnames attr_user = {
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
- .attr_capable = attr_user_capable,
};

struct attrnames *attr_namespaces[] =
Index: linux-2.6-xfs/fs/xfs/xfs_attr.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_attr.h 2008-04-29 21:33:38.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_attr.h 2008-04-29 21:33:52.000000000 +0200
@@ -42,7 +42,6 @@ typedef int (*attrset_t)(bhv_vnode_t *,
typedef int (*attrget_t)(bhv_vnode_t *, char *, void *, size_t, int);
typedef int (*attrremove_t)(bhv_vnode_t *, char *, int);
typedef int (*attrexists_t)(bhv_vnode_t *);
-typedef int (*attrcapable_t)(bhv_vnode_t *, struct cred *);

typedef struct attrnames {
char * attr_name;
@@ -52,7 +51,6 @@ typedef struct attrnames {
attrset_t attr_set;
attrremove_t attr_remove;
attrexists_t attr_exists;
- attrcapable_t attr_capable;
} attrnames_t;

#define ATTR_NAMECOUNT 4