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39f60c1cce
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "reiserfs.h"
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/xattr.h>
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#include <linux/slab.h>
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#include "xattr.h"
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#include <linux/security.h>
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#include <linux/uaccess.h>
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static int
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security_get(const struct xattr_handler *handler, struct dentry *unused,
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struct inode *inode, const char *name, void *buffer, size_t size)
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{
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if (IS_PRIVATE(inode))
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return -EPERM;
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return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
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buffer, size);
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}
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static int
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security_set(const struct xattr_handler *handler,
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struct mnt_idmap *idmap, struct dentry *unused,
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struct inode *inode, const char *name, const void *buffer,
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size_t size, int flags)
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{
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if (IS_PRIVATE(inode))
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return -EPERM;
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return reiserfs_xattr_set(inode,
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xattr_full_name(handler, name),
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buffer, size, flags);
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}
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static bool security_list(struct dentry *dentry)
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{
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return !IS_PRIVATE(d_inode(dentry));
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}
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/* Initializes the security context for a new inode and returns the number
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* of blocks needed for the transaction. If successful, reiserfs_security
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* must be released using reiserfs_security_free when the caller is done. */
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int reiserfs_security_init(struct inode *dir, struct inode *inode,
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const struct qstr *qstr,
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struct reiserfs_security_handle *sec)
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{
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int blocks = 0;
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int error;
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sec->name = NULL;
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sec->value = NULL;
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/* Don't add selinux attributes on xattrs - they'll never get used */
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if (IS_PRIVATE(dir))
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return 0;
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error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
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&sec->value, &sec->length);
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if (error) {
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if (error == -EOPNOTSUPP)
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error = 0;
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sec->name = NULL;
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sec->value = NULL;
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sec->length = 0;
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return error;
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}
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if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
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blocks = reiserfs_xattr_jcreate_nblocks(inode) +
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reiserfs_xattr_nblocks(inode, sec->length);
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/* We don't want to count the directories twice if we have
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* a default ACL. */
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REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
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}
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return blocks;
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}
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int reiserfs_security_write(struct reiserfs_transaction_handle *th,
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struct inode *inode,
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struct reiserfs_security_handle *sec)
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{
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int error;
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if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
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return -EINVAL;
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error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
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sec->length, XATTR_CREATE);
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if (error == -ENODATA || error == -EOPNOTSUPP)
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error = 0;
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return error;
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}
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void reiserfs_security_free(struct reiserfs_security_handle *sec)
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{
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kfree(sec->value);
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sec->name = NULL;
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sec->value = NULL;
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}
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const struct xattr_handler reiserfs_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.get = security_get,
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.set = security_set,
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.list = security_list,
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};
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