cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xattr_trusted.c (1219B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include "reiserfs.h"
      3#include <linux/capability.h>
      4#include <linux/errno.h>
      5#include <linux/fs.h>
      6#include <linux/pagemap.h>
      7#include <linux/xattr.h>
      8#include "xattr.h"
      9#include <linux/uaccess.h>
     10
     11static int
     12trusted_get(const struct xattr_handler *handler, struct dentry *unused,
     13	    struct inode *inode, const char *name, void *buffer, size_t size)
     14{
     15	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
     16		return -EPERM;
     17
     18	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
     19				  buffer, size);
     20}
     21
     22static int
     23trusted_set(const struct xattr_handler *handler,
     24	    struct user_namespace *mnt_userns, struct dentry *unused,
     25	    struct inode *inode, const char *name, const void *buffer,
     26	    size_t size, int flags)
     27{
     28	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
     29		return -EPERM;
     30
     31	return reiserfs_xattr_set(inode,
     32				  xattr_full_name(handler, name),
     33				  buffer, size, flags);
     34}
     35
     36static bool trusted_list(struct dentry *dentry)
     37{
     38	return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
     39}
     40
     41const struct xattr_handler reiserfs_xattr_trusted_handler = {
     42	.prefix = XATTR_TRUSTED_PREFIX,
     43	.get = trusted_get,
     44	.set = trusted_set,
     45	.list = trusted_list,
     46};