mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
3591f40e22
This makes it harder for accidental or malicious changes to erofs_xattr_handlers or xattr_handler_map at runtime. Cc: Gao Xiang <xiang@kernel.org> Cc: Chao Yu <chao@kernel.org> Cc: Yue Hu <huyue2@coolpad.com> Cc: Jeffle Xu <jefflexu@linux.alibaba.com> Cc: linux-erofs@lists.ozlabs.org Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Link: https://lore.kernel.org/r/20230930050033.41174-9-wedsonaf@gmail.com Acked-by: Gao Xiang <hsiangkao@linux.alibaba.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2017-2018 HUAWEI, Inc.
|
|
* https://www.huawei.com/
|
|
*/
|
|
#ifndef __EROFS_XATTR_H
|
|
#define __EROFS_XATTR_H
|
|
|
|
#include "internal.h"
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/xattr.h>
|
|
|
|
/* Attribute not found */
|
|
#define ENOATTR ENODATA
|
|
|
|
#ifdef CONFIG_EROFS_FS_XATTR
|
|
extern const struct xattr_handler erofs_xattr_user_handler;
|
|
extern const struct xattr_handler erofs_xattr_trusted_handler;
|
|
extern const struct xattr_handler erofs_xattr_security_handler;
|
|
|
|
static inline const char *erofs_xattr_prefix(unsigned int idx,
|
|
struct dentry *dentry)
|
|
{
|
|
const struct xattr_handler *handler = NULL;
|
|
|
|
static const struct xattr_handler * const xattr_handler_map[] = {
|
|
[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
|
|
[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
|
|
#endif
|
|
[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
|
|
#ifdef CONFIG_EROFS_FS_SECURITY
|
|
[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
|
|
#endif
|
|
};
|
|
|
|
if (idx && idx < ARRAY_SIZE(xattr_handler_map))
|
|
handler = xattr_handler_map[idx];
|
|
|
|
if (!xattr_handler_can_list(handler, dentry))
|
|
return NULL;
|
|
|
|
return xattr_prefix(handler);
|
|
}
|
|
|
|
extern const struct xattr_handler * const erofs_xattr_handlers[];
|
|
|
|
int erofs_xattr_prefixes_init(struct super_block *sb);
|
|
void erofs_xattr_prefixes_cleanup(struct super_block *sb);
|
|
int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
|
|
ssize_t erofs_listxattr(struct dentry *, char *, size_t);
|
|
#else
|
|
static inline int erofs_xattr_prefixes_init(struct super_block *sb) { return 0; }
|
|
static inline void erofs_xattr_prefixes_cleanup(struct super_block *sb) {}
|
|
static inline int erofs_getxattr(struct inode *inode, int index,
|
|
const char *name, void *buffer,
|
|
size_t buffer_size)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#define erofs_listxattr (NULL)
|
|
#define erofs_xattr_handlers (NULL)
|
|
#endif /* !CONFIG_EROFS_FS_XATTR */
|
|
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
|
|
#else
|
|
#define erofs_get_acl (NULL)
|
|
#endif
|
|
|
|
#endif
|