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cifs: Do not set cifs/ntfs acl using a file handle (try #4)

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Set security descriptor using path name instead of a file handle.
We can't be sure that the file handle has adequate permission to
set a security descriptor (to modify DACL).

Function set_cifs_acl_by_fid() has been removed since we can't be
sure how a file was opened for writing, a valid request can fail
if the file was not opened with two above mentioned permissions.
We could have opted to add on WRITE_DAC and WRITE_OWNER permissions
to file opens and then use that file handle but adding addtional
permissions such as WRITE_DAC and WRITE_OWNER could cause an
any open to fail.

And it was incorrect to look for read file handle to set a
security descriptor anyway.

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Shirish Pargaonkar 2011-08-09 14:30:39 -05:00 committed by Steve French
parent 789e666123
commit e22906c564
1 changed files with 1 additions and 27 deletions
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28
fs/cifs/cifsacl.c
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@ -991,24 +991,6 @@ struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
return pntsd;
}
static int set_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, __u16 fid,
struct cifs_ntsd *pnntsd, u32 acllen)
{
int xid, rc;
struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
xid = GetXid();
rc = CIFSSMBSetCIFSACL(xid, tlink_tcon(tlink), fid, pnntsd, acllen);
FreeXid(xid);
cifs_put_tlink(tlink);
cFYI(DBG2, "SetCIFSACL rc = %d", rc);
return rc;
}
static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path,
struct cifs_ntsd *pnntsd, u32 acllen)
{
@ -1047,18 +1029,10 @@ int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
struct inode *inode, const char *path)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsFileInfo *open_file;
int rc;
cFYI(DBG2, "set ACL for %s from mode 0x%x", path, inode->i_mode);
open_file = find_readable_file(CIFS_I(inode), true);
if (!open_file)
return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen);
rc = set_cifs_acl_by_fid(cifs_sb, open_file->netfid, pnntsd, acllen);
cifsFileInfo_put(open_file);
return rc;
return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen);
}
/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */