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Validate_buf () function checks for an expected minimum sized response passed to query_info() function. For security information, the size of a security descriptor can be smaller (one subauthority, no ACEs) than the size of the structure that defines FileInfoClass of FileAllInformation. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199725 Cc: <stable@vger.kernel.org> Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Noah Morrison <noah.morrison@rubrik.com> Signed-off-by: Steve French <stfrench@microsoft.com>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* fs/cifs/cifsacl.h
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*
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* Copyright (c) International Business Machines Corp., 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _CIFSACL_H
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#define _CIFSACL_H
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#define NUM_AUTHS (6) /* number of authority fields */
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#define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
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#define READ_BIT 0x4
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#define WRITE_BIT 0x2
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#define EXEC_BIT 0x1
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#define UBITSHIFT 6
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#define GBITSHIFT 3
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#define ACCESS_ALLOWED 0
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#define ACCESS_DENIED 1
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#define SIDOWNER 1
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#define SIDGROUP 2
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/*
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* Security Descriptor length containing DACL with 3 ACEs (one each for
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* owner, group and world).
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*/
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#define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
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sizeof(struct cifs_acl) + \
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(sizeof(struct cifs_ace) * 3))
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/*
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* Maximum size of a string representation of a SID:
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*
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* The fields are unsigned values in decimal. So:
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*
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* u8: max 3 bytes in decimal
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* u32: max 10 bytes in decimal
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*
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* "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
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*
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* For authority field, max is when all 6 values are non-zero and it must be
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* represented in hex. So "-0x" + 12 hex digits.
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*
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* Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
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*/
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#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
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#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
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struct cifs_ntsd {
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__le16 revision; /* revision level */
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__le16 type;
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__le32 osidoffset;
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__le32 gsidoffset;
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__le32 sacloffset;
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__le32 dacloffset;
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} __attribute__((packed));
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struct cifs_sid {
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__u8 revision; /* revision level */
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__u8 num_subauth;
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__u8 authority[NUM_AUTHS];
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__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
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} __attribute__((packed));
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/* size of a struct cifs_sid, sans sub_auth array */
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#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
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struct cifs_acl {
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__le16 revision; /* revision level */
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__le16 size;
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__le32 num_aces;
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} __attribute__((packed));
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struct cifs_ace {
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__u8 type;
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__u8 flags;
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__le16 size;
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__le32 access_req;
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struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
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} __attribute__((packed));
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/*
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* Minimum security identifier can be one for system defined Users
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* and Groups such as NULL SID and World or Built-in accounts such
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* as Administrator and Guest and consists of
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* Revision + Num (Sub)Auths + Authority + Domain (one Subauthority)
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*/
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#define MIN_SID_LEN (1 + 1 + 6 + 4) /* in bytes */
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/*
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* Minimum security descriptor can be one without any SACL and DACL and can
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* consist of revision, type, and two sids of minimum size for owner and group
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*/
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#define MIN_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + (2 * MIN_SID_LEN))
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#endif /* _CIFSACL_H */
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