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kernfs: implement "trusted.*" xattr support

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kernfs inherited "security.*" xattr support from sysfs.  This patch
extends xattr support to "trusted.*" using simple_xattr_*().  As
trusted xattrs are restricted to CAP_SYS_ADMIN, simple_xattr_*() which
uses kernel memory for storage shouldn't be problematic.

Note that the existing "security.*" support doesn't implement
get/remove/list and the this patch only implements those ops for
"trusted.*".  We probably want to extend those ops to include support
for "security.*".

This patch will allow using kernfs from cgroup which requires
"trusted.*" xattr support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: David P. Quigley <dpquigl@tycho.nsa.gov>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-11-23 17:40:02 -05:00 • committed by Greg Kroah-Hartman
parent 9a8049affd
commit 2322392b02
4 changed files with 74 additions and 11 deletions
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7
fs/kernfs/kernfs-internal.h
View file

@ -14,6 +14,7 @@
#include <linux/lockdep.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/xattr.h>
#include <linux/kernfs.h>
@ -21,6 +22,8 @@ struct sysfs_inode_attrs {
struct iattr ia_iattr;
void *ia_secdata;
u32 ia_secdata_len;
struct simple_xattrs xattrs;
};
#define SD_DEACTIVATED_BIAS INT_MIN
@ -81,6 +84,10 @@ int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int sysfs_removexattr(struct dentry *dentry, const char *name);
ssize_t sysfs_getxattr(struct dentry *dentry, const char *name, void *buf,
size_t size);
ssize_t sysfs_listxattr(struct dentry *dentry, char *buf, size_t size);
void sysfs_inode_init(void);
/*