mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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5224f79096
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
@@
identifier S, member, array;
type T1, T2;
@@
struct S {
...
T1 member;
T2 array[
- 0
];
};
UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2021 Samsung Electronics Co., Ltd.
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*/
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#ifndef __XATTR_H__
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#define __XATTR_H__
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/*
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* These are on-disk structures to store additional metadata into xattr to
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* reproduce windows filesystem semantics. And they are encoded with NDR to
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* compatible with samba's xattr meta format. The compatibility with samba
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* is important because it can lose the information(file attribute,
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* creation time, acls) about the existing files when switching between
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* ksmbd and samba.
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*/
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/*
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* Dos attribute flags used for what variable is valid.
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*/
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enum {
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XATTR_DOSINFO_ATTRIB = 0x00000001,
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XATTR_DOSINFO_EA_SIZE = 0x00000002,
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XATTR_DOSINFO_SIZE = 0x00000004,
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XATTR_DOSINFO_ALLOC_SIZE = 0x00000008,
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XATTR_DOSINFO_CREATE_TIME = 0x00000010,
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XATTR_DOSINFO_CHANGE_TIME = 0x00000020,
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XATTR_DOSINFO_ITIME = 0x00000040
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};
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/*
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* Dos attribute structure which is compatible with samba's one.
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* Storing it into the xattr named "DOSATTRIB" separately from inode
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* allows ksmbd to faithfully reproduce windows filesystem semantics
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* on top of a POSIX filesystem.
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*/
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struct xattr_dos_attrib {
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__u16 version; /* version 3 or version 4 */
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__u32 flags; /* valid flags */
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__u32 attr; /* Dos attribute */
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__u32 ea_size; /* EA size */
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__u64 size;
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__u64 alloc_size;
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__u64 create_time; /* File creation time */
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__u64 change_time; /* File change time */
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__u64 itime; /* Invented/Initial time */
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};
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/*
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* Enumeration is used for computing posix acl hash.
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*/
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enum {
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SMB_ACL_TAG_INVALID = 0,
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SMB_ACL_USER,
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SMB_ACL_USER_OBJ,
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SMB_ACL_GROUP,
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SMB_ACL_GROUP_OBJ,
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SMB_ACL_OTHER,
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SMB_ACL_MASK
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};
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#define SMB_ACL_READ 4
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#define SMB_ACL_WRITE 2
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#define SMB_ACL_EXECUTE 1
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struct xattr_acl_entry {
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int type;
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uid_t uid;
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gid_t gid;
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mode_t perm;
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};
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/*
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* xattr_smb_acl structure is used for computing posix acl hash.
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*/
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struct xattr_smb_acl {
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int count;
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int next;
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struct xattr_acl_entry entries[];
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};
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/* 64bytes hash in xattr_ntacl is computed with sha256 */
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#define XATTR_SD_HASH_TYPE_SHA256 0x1
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#define XATTR_SD_HASH_SIZE 64
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/*
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* xattr_ntacl is used for storing ntacl and hashes.
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* Hash is used for checking valid posix acl and ntacl in xattr.
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*/
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struct xattr_ntacl {
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__u16 version; /* version 4*/
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void *sd_buf;
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__u32 sd_size;
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__u16 hash_type; /* hash type */
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__u8 desc[10]; /* posix_acl description */
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__u16 desc_len;
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__u64 current_time;
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__u8 hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for ntacl */
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__u8 posix_acl_hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for posix acl */
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};
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/* DOS ATTRIBUITE XATTR PREFIX */
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#define DOS_ATTRIBUTE_PREFIX "DOSATTRIB"
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#define DOS_ATTRIBUTE_PREFIX_LEN (sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
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#define XATTR_NAME_DOS_ATTRIBUTE (XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
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#define XATTR_NAME_DOS_ATTRIBUTE_LEN \
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(sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
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/* STREAM XATTR PREFIX */
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#define STREAM_PREFIX "DosStream."
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#define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1)
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#define XATTR_NAME_STREAM (XATTR_USER_PREFIX STREAM_PREFIX)
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#define XATTR_NAME_STREAM_LEN (sizeof(XATTR_NAME_STREAM) - 1)
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/* SECURITY DESCRIPTOR(NTACL) XATTR PREFIX */
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#define SD_PREFIX "NTACL"
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#define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1)
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#define XATTR_NAME_SD (XATTR_SECURITY_PREFIX SD_PREFIX)
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#define XATTR_NAME_SD_LEN \
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(sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
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#endif /* __XATTR_H__ */
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