linux_kernel/fs/reiserfs/xattr_trusted.c

#include "reiserfs.h"
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "xattr.h"
#include <linux/uaccess.h>

static int
trusted_get(const struct xattr_handler *handler, struct dentry *dentry,
	    const char *name, void *buffer, size_t size)
{
	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
		return -EINVAL;

	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
		return -EPERM;

	return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
}

static int
trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
	    const char *name, const void *buffer, size_t size, int flags)
{
	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
		return -EINVAL;

	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
		return -EPERM;

	return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
}

static bool trusted_list(struct dentry *dentry)
{
	return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
}

const struct xattr_handler reiserfs_xattr_trusted_handler = {
	.prefix = XATTR_TRUSTED_PREFIX,
	.get = trusted_get,
	.set = trusted_set,
	.list = trusted_list,
};