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https://gitee.com/bianbu-linux/linux-6.6
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aeb7f00542
In previous patches we implemented get and set inode operations for all non-stacking filesystems that support posix acls but didn't yet implement get and/or set acl inode operations. This specifically affected cifs and 9p. Now we can build a posix acl api based solely on get and set inode operations. We add a new vfs_remove_acl() api that can be used to set posix acls. This finally removes all type unsafety and type conversion issues explained in detail in [1] that we aim to get rid of. After we finished building the vfs api we can switch stacking filesystems to rely on the new posix api and then finally switch the xattr system calls themselves to rely on the posix acl api. Link: https://lore.kernel.org/all/20220801145520.1532837-1-brauner@kernel.org [1] Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
185 lines
4.8 KiB
C
185 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* evm.h
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*
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* Copyright (c) 2009 IBM Corporation
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* Author: Mimi Zohar <zohar@us.ibm.com>
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*/
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#ifndef _LINUX_EVM_H
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#define _LINUX_EVM_H
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#include <linux/integrity.h>
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#include <linux/xattr.h>
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struct integrity_iint_cache;
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#ifdef CONFIG_EVM
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extern int evm_set_key(void *key, size_t keylen);
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extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
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const char *xattr_name,
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void *xattr_value,
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size_t xattr_value_len,
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struct integrity_iint_cache *iint);
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extern int evm_inode_setattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, struct iattr *attr);
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extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
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extern int evm_inode_setxattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *name,
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const void *value, size_t size);
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extern void evm_inode_post_setxattr(struct dentry *dentry,
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const char *xattr_name,
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const void *xattr_value,
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size_t xattr_value_len);
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extern int evm_inode_removexattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *xattr_name);
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extern void evm_inode_post_removexattr(struct dentry *dentry,
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const char *xattr_name);
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static inline void evm_inode_post_remove_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry,
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const char *acl_name)
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{
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evm_inode_post_removexattr(dentry, acl_name);
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}
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extern int evm_inode_set_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *acl_name,
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struct posix_acl *kacl);
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static inline int evm_inode_remove_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry,
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const char *acl_name)
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{
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return evm_inode_set_acl(mnt_userns, dentry, acl_name, NULL);
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}
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static inline void evm_inode_post_set_acl(struct dentry *dentry,
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const char *acl_name,
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struct posix_acl *kacl)
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{
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return evm_inode_post_setxattr(dentry, acl_name, NULL, 0);
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}
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extern int evm_inode_init_security(struct inode *inode,
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const struct xattr *xattr_array,
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struct xattr *evm);
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extern bool evm_revalidate_status(const char *xattr_name);
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extern int evm_protected_xattr_if_enabled(const char *req_xattr_name);
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extern int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
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int buffer_size, char type,
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bool canonical_fmt);
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#ifdef CONFIG_FS_POSIX_ACL
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extern int posix_xattr_acl(const char *xattrname);
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#else
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static inline int posix_xattr_acl(const char *xattrname)
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{
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return 0;
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}
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#endif
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#else
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static inline int evm_set_key(void *key, size_t keylen)
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{
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return -EOPNOTSUPP;
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}
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#ifdef CONFIG_INTEGRITY
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static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
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const char *xattr_name,
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void *xattr_value,
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size_t xattr_value_len,
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struct integrity_iint_cache *iint)
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{
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return INTEGRITY_UNKNOWN;
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}
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#endif
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static inline int evm_inode_setattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, struct iattr *attr)
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{
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return 0;
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}
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static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
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{
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return;
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}
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static inline int evm_inode_setxattr(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *name,
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const void *value, size_t size)
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{
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return 0;
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}
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static inline void evm_inode_post_setxattr(struct dentry *dentry,
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const char *xattr_name,
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const void *xattr_value,
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size_t xattr_value_len)
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{
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return;
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}
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static inline int evm_inode_removexattr(struct user_namespace *mnt_userns,
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struct dentry *dentry,
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const char *xattr_name)
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{
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return 0;
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}
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static inline void evm_inode_post_removexattr(struct dentry *dentry,
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const char *xattr_name)
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{
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return;
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}
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static inline void evm_inode_post_remove_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry,
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const char *acl_name)
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{
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return;
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}
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static inline int evm_inode_set_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry, const char *acl_name,
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struct posix_acl *kacl)
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{
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return 0;
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}
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static inline int evm_inode_remove_acl(struct user_namespace *mnt_userns,
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struct dentry *dentry,
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const char *acl_name)
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{
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return 0;
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}
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static inline void evm_inode_post_set_acl(struct dentry *dentry,
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const char *acl_name,
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struct posix_acl *kacl)
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{
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return;
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}
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static inline int evm_inode_init_security(struct inode *inode,
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const struct xattr *xattr_array,
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struct xattr *evm)
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{
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return 0;
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}
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static inline bool evm_revalidate_status(const char *xattr_name)
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{
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return false;
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}
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static inline int evm_protected_xattr_if_enabled(const char *req_xattr_name)
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{
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return false;
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}
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static inline int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
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int buffer_size, char type,
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bool canonical_fmt)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_EVM */
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#endif /* LINUX_EVM_H */
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