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[CIFS] Fix set file size to zero when doing chmod to Samba 3.0.26pre 

In fixing a bug Samba 3.0.26pre allowed some clients (including Linux cifs
client) to change file size to zero in SET_FILE_UNIX_BASIC (which Linux cifs
client uses for chmod).

The server has been "fixed" now but that also fixes the client to net send
file size zero on chmod.

Fixes Samba bugzilla bug # 4418.

Fixed with help from Jeremy Allison

Signed-off-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-03-01 04:11:22 +00:00
parent 99ee4dbd7c
commit c7af1857ef
2 changed files with 13 additions and 0 deletions
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3
fs/cifs/cifspdu.h
View File

@ -220,6 +220,9 @@
*/
#define CIFS_NO_HANDLE 0xFFFF
#define NO_CHANGE_64 0xFFFFFFFFFFFFFFFFULL
#define NO_CHANGE_32 0xFFFFFFFFUL
/* IPC$ in ASCII */
#define CIFS_IPC_RESOURCE "\x49\x50\x43\x24"

10
fs/cifs/cifssmb.c
View File

@ -4803,6 +4803,16 @@ CIFSSMBUnixSetPerms(const int xid, struct cifsTconInfo *tcon,
pSMB->InformationLevel = cpu_to_le16(SMB_SET_FILE_UNIX_BASIC);
pSMB->Reserved4 = 0;
pSMB->hdr.smb_buf_length += byte_count;
/* Samba server ignores set of file size to zero due to bugs in some
older clients, but we should be precise - we use SetFileSize to
set file size and do not want to truncate file size to zero
accidently as happened on one Samba server beta by putting
zero instead of -1 here */
data_offset->EndOfFile = NO_CHANGE_64;
data_offset->NumOfBytes = NO_CHANGE_64;
data_offset->LastStatusChange = NO_CHANGE_64;
data_offset->LastAccessTime = NO_CHANGE_64;
data_offset->LastModificationTime = NO_CHANGE_64;
data_offset->Uid = cpu_to_le64(uid);
data_offset->Gid = cpu_to_le64(gid);
/* better to leave device as zero when it is */