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cifs: Replace remaining 1-element arrays
commit 35235e19b3 upstream.
The kernel is globally removing the ambiguous 0-length and 1-element
arrays in favor of flexible arrays, so that we can gain both compile-time
and run-time array bounds checking[1].
Replace the trailing 1-element array with a flexible array in the
following structures:
struct cifs_spnego_msg
struct cifs_quota_data
struct get_dfs_referral_rsp
struct file_alt_name_info
NEGOTIATE_RSP
SESSION_SETUP_ANDX
TCONX_REQ
TCONX_RSP
TCONX_RSP_EXT
ECHO_REQ
ECHO_RSP
OPEN_REQ
OPENX_REQ
LOCK_REQ
RENAME_REQ
COPY_REQ
COPY_RSP
NT_RENAME_REQ
DELETE_FILE_REQ
DELETE_DIRECTORY_REQ
CREATE_DIRECTORY_REQ
QUERY_INFORMATION_REQ
SETATTR_REQ
TRANSACT_IOCTL_REQ
TRANSACT_CHANGE_NOTIFY_REQ
TRANSACTION2_QPI_REQ
TRANSACTION2_SPI_REQ
TRANSACTION2_FFIRST_REQ
TRANSACTION2_GET_DFS_REFER_REQ
FILE_UNIX_LINK_INFO
FILE_DIRECTORY_INFO
FILE_FULL_DIRECTORY_INFO
SEARCH_ID_FULL_DIR_INFO
FILE_BOTH_DIRECTORY_INFO
FIND_FILE_STANDARD_INFO
Replace the trailing 1-element array with a flexible array, but leave
the existing structure padding:
FILE_ALL_INFO
FILE_UNIX_INFO
Remove unused structures:
struct gea
struct gealist
Adjust all related size calculations to match the changes to sizeof().
No machine code output differences are produced after these changes.
[1] For lots of details, see both:
https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
https://people.kernel.org/kees/bounded-flexible-arrays-in-c
Cc: Steve French <sfrench@samba.org>
Cc: Paulo Alcantara <pc@cjr.nz>
Cc: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
[ Salvatore Bonaccorso: Patch does not apply cleanly only due to a
whitespace difference in fs/smb/client/cifspdu.h . Fixed up manually. ]
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook
Greg Kroah-Hartman
parent
2ceacda270
commit
b3686200ad
@ -24,7 +24,7 @@ struct cifs_spnego_msg {
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uint32_t flags;
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uint32_t sesskey_len;
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uint32_t secblob_len;
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uint8_t data[1];
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uint8_t data[];
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};
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#ifdef __KERNEL__
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@ -562,7 +562,7 @@ typedef union smb_com_session_setup_andx {
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__u32 Reserved;
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__le32 Capabilities; /* see below */
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__le16 ByteCount;
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unsigned char SecurityBlob[1]; /* followed by */
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unsigned char SecurityBlob[]; /* followed by */
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/* STRING NativeOS */
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/* STRING NativeLanMan */
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} __attribute__((packed)) req; /* NTLM request format (with
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@ -582,7 +582,7 @@ typedef union smb_com_session_setup_andx {
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__u32 Reserved; /* see below */
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__le32 Capabilities;
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__le16 ByteCount;
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unsigned char CaseInsensitivePassword[1]; /* followed by: */
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unsigned char CaseInsensitivePassword[]; /* followed by: */
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/* unsigned char * CaseSensitivePassword; */
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/* STRING AccountName */
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/* STRING PrimaryDomain */
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@ -599,7 +599,7 @@ typedef union smb_com_session_setup_andx {
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__le16 Action; /* see below */
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__le16 SecurityBlobLength;
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__u16 ByteCount;
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unsigned char SecurityBlob[1]; /* followed by */
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unsigned char SecurityBlob[]; /* followed by */
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/* unsigned char * NativeOS; */
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/* unsigned char * NativeLanMan; */
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/* unsigned char * PrimaryDomain; */
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@ -618,7 +618,7 @@ typedef union smb_com_session_setup_andx {
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__le16 PasswordLength;
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__u32 Reserved; /* encrypt key len and offset */
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__le16 ByteCount;
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unsigned char AccountPassword[1]; /* followed by */
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unsigned char AccountPassword[]; /* followed by */
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/* STRING AccountName */
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/* STRING PrimaryDomain */
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/* STRING NativeOS */
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@ -632,7 +632,7 @@ typedef union smb_com_session_setup_andx {
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__le16 AndXOffset;
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__le16 Action; /* see below */
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__u16 ByteCount;
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unsigned char NativeOS[1]; /* followed by */
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unsigned char NativeOS[]; /* followed by */
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/* unsigned char * NativeLanMan; */
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/* unsigned char * PrimaryDomain; */
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} __attribute__((packed)) old_resp; /* pre-NTLM (LANMAN2.1) response */
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@ -693,7 +693,7 @@ typedef struct smb_com_tconx_req {
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__le16 Flags; /* see below */
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__le16 PasswordLength;
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__le16 ByteCount;
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unsigned char Password[1]; /* followed by */
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unsigned char Password[]; /* followed by */
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/* STRING Path *//* \\server\share name */
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/* STRING Service */
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} __attribute__((packed)) TCONX_REQ;
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@ -705,7 +705,7 @@ typedef struct smb_com_tconx_rsp {
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__le16 AndXOffset;
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__le16 OptionalSupport; /* see below */
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__u16 ByteCount;
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unsigned char Service[1]; /* always ASCII, not Unicode */
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unsigned char Service[]; /* always ASCII, not Unicode */
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/* STRING NativeFileSystem */
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} __attribute__((packed)) TCONX_RSP;
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@ -718,7 +718,7 @@ typedef struct smb_com_tconx_rsp_ext {
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__le32 MaximalShareAccessRights;
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__le32 GuestMaximalShareAccessRights;
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__u16 ByteCount;
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unsigned char Service[1]; /* always ASCII, not Unicode */
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unsigned char Service[]; /* always ASCII, not Unicode */
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/* STRING NativeFileSystem */
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} __attribute__((packed)) TCONX_RSP_EXT;
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@ -755,14 +755,14 @@ typedef struct smb_com_echo_req {
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struct smb_hdr hdr;
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__le16 EchoCount;
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__le16 ByteCount;
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char Data[1];
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char Data[];
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} __attribute__((packed)) ECHO_REQ;
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typedef struct smb_com_echo_rsp {
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struct smb_hdr hdr;
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__le16 SequenceNumber;
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__le16 ByteCount;
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char Data[1];
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char Data[];
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} __attribute__((packed)) ECHO_RSP;
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typedef struct smb_com_logoff_andx_req {
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@ -862,7 +862,7 @@ typedef struct smb_com_open_req { /* also handles create */
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__le32 ImpersonationLevel;
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__u8 SecurityFlags;
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__le16 ByteCount;
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char fileName[1];
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char fileName[];
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} __attribute__((packed)) OPEN_REQ;
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/* open response: oplock levels */
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@ -939,7 +939,7 @@ typedef struct smb_com_openx_req {
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__le32 Timeout;
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__le32 Reserved;
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__le16 ByteCount; /* file name follows */
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char fileName[1];
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char fileName[];
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} __attribute__((packed)) OPENX_REQ;
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typedef struct smb_com_openx_rsp {
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@ -1087,7 +1087,7 @@ typedef struct smb_com_lock_req {
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__le16 NumberOfUnlocks;
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__le16 NumberOfLocks;
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__le16 ByteCount;
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LOCKING_ANDX_RANGE Locks[1];
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LOCKING_ANDX_RANGE Locks[];
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} __attribute__((packed)) LOCK_REQ;
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/* lock type */
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@ -1116,7 +1116,7 @@ typedef struct smb_com_rename_req {
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__le16 SearchAttributes; /* target file attributes */
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII or Unicode */
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unsigned char OldFileName[1];
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unsigned char OldFileName[];
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/* followed by __u8 BufferFormat2 */
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/* followed by NewFileName */
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} __attribute__((packed)) RENAME_REQ;
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@ -1136,7 +1136,7 @@ typedef struct smb_com_copy_req {
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__le16 Flags;
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII or Unicode */
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unsigned char OldFileName[1];
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unsigned char OldFileName[];
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/* followed by __u8 BufferFormat2 */
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/* followed by NewFileName string */
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} __attribute__((packed)) COPY_REQ;
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@ -1146,7 +1146,7 @@ typedef struct smb_com_copy_rsp {
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__le16 CopyCount; /* number of files copied */
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__u16 ByteCount; /* may be zero */
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__u8 BufferFormat; /* 0x04 - only present if errored file follows */
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unsigned char ErrorFileName[1]; /* only present if error in copy */
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unsigned char ErrorFileName[]; /* only present if error in copy */
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} __attribute__((packed)) COPY_RSP;
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#define CREATE_HARD_LINK 0x103
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@ -1160,7 +1160,7 @@ typedef struct smb_com_nt_rename_req { /* A5 - also used for create hardlink */
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__le32 ClusterCount;
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII or Unicode */
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unsigned char OldFileName[1];
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unsigned char OldFileName[];
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/* followed by __u8 BufferFormat2 */
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/* followed by NewFileName */
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} __attribute__((packed)) NT_RENAME_REQ;
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@ -1175,7 +1175,7 @@ typedef struct smb_com_delete_file_req {
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__le16 SearchAttributes;
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII */
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unsigned char fileName[1];
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unsigned char fileName[];
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} __attribute__((packed)) DELETE_FILE_REQ;
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typedef struct smb_com_delete_file_rsp {
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@ -1187,7 +1187,7 @@ typedef struct smb_com_delete_directory_req {
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struct smb_hdr hdr; /* wct = 0 */
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII */
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unsigned char DirName[1];
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unsigned char DirName[];
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} __attribute__((packed)) DELETE_DIRECTORY_REQ;
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typedef struct smb_com_delete_directory_rsp {
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@ -1199,7 +1199,7 @@ typedef struct smb_com_create_directory_req {
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struct smb_hdr hdr; /* wct = 0 */
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__le16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII */
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unsigned char DirName[1];
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unsigned char DirName[];
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} __attribute__((packed)) CREATE_DIRECTORY_REQ;
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typedef struct smb_com_create_directory_rsp {
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@ -1211,7 +1211,7 @@ typedef struct smb_com_query_information_req {
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struct smb_hdr hdr; /* wct = 0 */
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__le16 ByteCount; /* 1 + namelen + 1 */
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__u8 BufferFormat; /* 4 = ASCII */
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unsigned char FileName[1];
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unsigned char FileName[];
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} __attribute__((packed)) QUERY_INFORMATION_REQ;
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typedef struct smb_com_query_information_rsp {
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@ -1231,7 +1231,7 @@ typedef struct smb_com_setattr_req {
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__le16 reserved[5]; /* must be zero */
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__u16 ByteCount;
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__u8 BufferFormat; /* 4 = ASCII */
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unsigned char fileName[1];
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unsigned char fileName[];
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} __attribute__((packed)) SETATTR_REQ;
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typedef struct smb_com_setattr_rsp {
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@ -1313,7 +1313,7 @@ typedef struct smb_com_transaction_ioctl_req {
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__u8 IsRootFlag; /* 1 = apply command to root of share (must be DFS) */
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__le16 ByteCount;
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__u8 Pad[3];
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__u8 Data[1];
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__u8 Data[];
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} __attribute__((packed)) TRANSACT_IOCTL_REQ;
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typedef struct smb_com_transaction_compr_ioctl_req {
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@ -1431,8 +1431,8 @@ typedef struct smb_com_transaction_change_notify_req {
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__u8 WatchTree; /* 1 = Monitor subdirectories */
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__u8 Reserved2;
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__le16 ByteCount;
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/* __u8 Pad[3];*/
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/* __u8 Data[1];*/
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/* __u8 Pad[3];*/
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/* __u8 Data[];*/
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} __attribute__((packed)) TRANSACT_CHANGE_NOTIFY_REQ;
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/* BB eventually change to use generic ntransact rsp struct
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@ -1521,7 +1521,7 @@ struct cifs_quota_data {
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__u64 space_used;
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__u64 soft_limit;
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__u64 hard_limit;
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char sid[1]; /* variable size? */
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char sid[]; /* variable size? */
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} __attribute__((packed));
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/* quota sub commands */
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@ -1673,7 +1673,7 @@ typedef struct smb_com_transaction2_qpi_req {
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__u8 Pad;
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__le16 InformationLevel;
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__u32 Reserved4;
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) TRANSACTION2_QPI_REQ;
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typedef struct smb_com_transaction2_qpi_rsp {
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@ -1706,7 +1706,7 @@ typedef struct smb_com_transaction2_spi_req {
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__u16 Pad1;
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__le16 InformationLevel;
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__u32 Reserved4;
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) TRANSACTION2_SPI_REQ;
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typedef struct smb_com_transaction2_spi_rsp {
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@ -1813,7 +1813,7 @@ typedef struct smb_com_transaction2_ffirst_req {
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__le16 SearchFlags;
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__le16 InformationLevel;
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__le32 SearchStorageType;
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) TRANSACTION2_FFIRST_REQ;
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typedef struct smb_com_transaction2_ffirst_rsp {
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@ -2024,7 +2024,7 @@ typedef struct smb_com_transaction2_get_dfs_refer_req {
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perhaps?) followed by one byte pad - doesn't
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seem to matter though */
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__le16 MaxReferralLevel;
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char RequestFileName[1];
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char RequestFileName[];
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} __attribute__((packed)) TRANSACTION2_GET_DFS_REFER_REQ;
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#define DFS_VERSION cpu_to_le16(0x0003)
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@ -2053,7 +2053,7 @@ struct get_dfs_referral_rsp {
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__le16 PathConsumed;
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__le16 NumberOfReferrals;
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__le32 DFSFlags;
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REFERRAL3 referrals[1]; /* array of level 3 dfs_referral structures */
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REFERRAL3 referrals[]; /* array of level 3 dfs_referral structures */
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/* followed by the strings pointed to by the referral structures */
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} __packed;
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@ -2292,7 +2292,10 @@ typedef struct { /* data block encoding of response to level 263 QPathInfo */
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__le32 Mode;
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__le32 AlignmentRequirement;
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__le32 FileNameLength;
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char FileName[1];
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union {
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char __pad;
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DECLARE_FLEX_ARRAY(char, FileName);
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};
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} __attribute__((packed)) FILE_ALL_INFO; /* level 0x107 QPathInfo */
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typedef struct {
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@ -2330,7 +2333,7 @@ typedef struct {
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} __attribute__((packed)) FILE_UNIX_BASIC_INFO; /* level 0x200 QPathInfo */
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typedef struct {
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char LinkDest[1];
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DECLARE_FLEX_ARRAY(char, LinkDest);
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} __attribute__((packed)) FILE_UNIX_LINK_INFO; /* level 0x201 QPathInfo */
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/* The following three structures are needed only for
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@ -2380,7 +2383,7 @@ struct file_end_of_file_info {
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} __attribute__((packed)); /* size info, level 0x104 for set, 0x106 for query */
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struct file_alt_name_info {
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__u8 alt_name[1];
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DECLARE_FLEX_ARRAY(__u8, alt_name);
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} __attribute__((packed)); /* level 0x0108 */
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struct file_stream_info {
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@ -2490,7 +2493,10 @@ typedef struct {
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__le32 NextEntryOffset;
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__u32 ResumeKey; /* as with FileIndex - no need to convert */
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FILE_UNIX_BASIC_INFO basic;
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char FileName[1];
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union {
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char __pad;
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DECLARE_FLEX_ARRAY(char, FileName);
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};
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} __attribute__((packed)) FILE_UNIX_INFO; /* level 0x202 */
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typedef struct {
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@ -2504,7 +2510,7 @@ typedef struct {
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__le64 AllocationSize;
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__le32 ExtFileAttributes;
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__le32 FileNameLength;
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) FILE_DIRECTORY_INFO; /* level 0x101 FF resp data */
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typedef struct {
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@ -2519,7 +2525,7 @@ typedef struct {
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__le32 ExtFileAttributes;
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__le32 FileNameLength;
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__le32 EaSize; /* length of the xattrs */
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) FILE_FULL_DIRECTORY_INFO; /* level 0x102 rsp data */
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typedef struct {
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@ -2536,7 +2542,7 @@ typedef struct {
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__le32 EaSize; /* EA size */
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__le32 Reserved;
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__le64 UniqueId; /* inode num - le since Samba puts ino in low 32 bit*/
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) SEARCH_ID_FULL_DIR_INFO; /* level 0x105 FF rsp data */
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typedef struct {
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@ -2554,7 +2560,7 @@ typedef struct {
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__u8 ShortNameLength;
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__u8 Reserved;
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__u8 ShortName[24];
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) FILE_BOTH_DIRECTORY_INFO; /* level 0x104 FFrsp data */
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typedef struct {
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@ -2569,7 +2575,7 @@ typedef struct {
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__le32 AllocationSize;
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__le16 Attributes; /* verify not u32 */
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__u8 FileNameLength;
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char FileName[1];
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char FileName[];
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} __attribute__((packed)) FIND_FILE_STANDARD_INFO; /* level 0x1 FF resp data */
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@ -2579,16 +2585,6 @@ struct win_dev {
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__le64 minor;
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} __attribute__((packed));
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struct gea {
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unsigned char name_len;
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char name[1];
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} __attribute__((packed));
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struct gealist {
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unsigned long list_len;
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struct gea list[1];
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} __attribute__((packed));
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struct fea {
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unsigned char EA_flags;
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__u8 name_len;
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@ -497,7 +497,7 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
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FIND_FILE_STANDARD_INFO *pfData;
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pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
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new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
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new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 +
|
||||
pfData->FileNameLength;
|
||||
} else {
|
||||
u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
|
||||
@ -515,9 +515,9 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
|
||||
new_entry, end_of_smb, old_entry);
|
||||
return NULL;
|
||||
} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
|
||||
(new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
|
||||
(new_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 > end_of_smb))
|
||||
|| ((level != SMB_FIND_FILE_INFO_STANDARD) &&
|
||||
(new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
|
||||
(new_entry + sizeof(FILE_DIRECTORY_INFO) + 1 > end_of_smb))) {
|
||||
cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
|
||||
new_entry, end_of_smb);
|
||||
return NULL;
|
||||
|
||||
@ -5073,10 +5073,10 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
|
||||
|
||||
switch (srch_inf->info_level) {
|
||||
case SMB_FIND_FILE_DIRECTORY_INFO:
|
||||
info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
|
||||
info_buf_size = sizeof(FILE_DIRECTORY_INFO);
|
||||
break;
|
||||
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
|
||||
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
|
||||
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
|
||||
break;
|
||||
case SMB_FIND_FILE_POSIX_INFO:
|
||||
/* note that posix payload are variable size */
|
||||
|
||||
@ -373,7 +373,7 @@ struct smb2_file_id_extd_directory_info {
|
||||
__le32 EaSize; /* EA size */
|
||||
__le32 ReparsePointTag; /* valid if FILE_ATTR_REPARSE_POINT set in FileAttributes */
|
||||
__le64 UniqueId; /* inode num - le since Samba puts ino in low 32 bit */
|
||||
char FileName[1];
|
||||
char FileName[];
|
||||
} __packed; /* level 60 */
|
||||
|
||||
extern char smb2_padding[7];
|
||||
|
||||
Loading…
Reference in New Issue
Block a user