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authorJeff Layton <jlayton@redhat.com>2010-07-19 18:00:17 -0400
committerSteve French <sfrench@us.ibm.com>2010-08-02 12:40:39 +0000
commit3e4b3e1f68c10510ec8d3076cffc5729b88f8de6 (patch)
treebee962570f8a54547cfb67550f76874d82981fea /fs
parentf55fdcca6bf1c17e86a270a8c0d81c6677c61222 (diff)
downloadvexpress-lsk-3e4b3e1f68c10510ec8d3076cffc5729b88f8de6.tar.gz
cifs: add separate cred_uid field to sesInfo
Right now, there's no clear separation between the uid that owns the credentials used to do the mount and the overriding owner of the files on that mount. Add a separate cred_uid field that is set to the real uid of the mount user. Unlike the linux_uid, the uid= option does not override this parameter. The parm is sent to cifs.upcall, which can then preferentially use the creduid= parm instead of the uid= parm for finding credentials. This is not the only way to solve this. We could try to do all of this in kernel instead by having a module parameter that affects what gets passed in the uid= field of the upcall. That said, we have a lot more flexibility to change things in userspace so I think it probably makes sense to do it this way. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifs_spnego.c3
-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/connect.c7
3 files changed, 10 insertions, 3 deletions
diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index 379bd7d9c05..6effccff85a 100644
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -144,6 +144,9 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
dp = description + strlen(description);
+ sprintf(dp, ";creduid=0x%x", sesInfo->cred_uid);
+
+ dp = description + strlen(description);
sprintf(dp, ";user=%s", sesInfo->userName);
dp = description + strlen(description);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 9b7cf9aa3a0..59906146ad3 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -214,7 +214,8 @@ struct cifsSesInfo {
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
int Suid; /* remote smb uid */
- uid_t linux_uid; /* local Linux uid */
+ uid_t linux_uid; /* overriding owner of files on the mount */
+ uid_t cred_uid; /* owner of credentials */
int capabilities;
char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
TCP names - will ipv6 and sctp addresses fit? */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 399b60129b7..52a7646cc7a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -67,6 +67,7 @@ struct smb_vol {
char *iocharset; /* local code page for mapping to and from Unicode */
char source_rfc1001_name[16]; /* netbios name of client */
char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
+ uid_t cred_uid;
uid_t linux_uid;
gid_t linux_gid;
mode_t file_mode;
@@ -832,7 +833,8 @@ cifs_parse_mount_options(char *options, const char *devname,
/* null target name indicates to use *SMBSERVR default called name
if we end up sending RFC1001 session initialize */
vol->target_rfc1001_name[0] = 0;
- vol->linux_uid = current_uid(); /* use current_euid() instead? */
+ vol->cred_uid = current_uid();
+ vol->linux_uid = current_uid();
vol->linux_gid = current_gid();
/* default to only allowing write access to owner of the mount */
@@ -1658,7 +1660,7 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
switch (server->secType) {
case Kerberos:
- if (vol->linux_uid != ses->linux_uid)
+ if (vol->cred_uid != ses->cred_uid)
continue;
break;
default:
@@ -1775,6 +1777,7 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
if (ses->domainName)
strcpy(ses->domainName, volume_info->domainname);
}
+ ses->cred_uid = volume_info->cred_uid;
ses->linux_uid = volume_info->linux_uid;
ses->overrideSecFlg = volume_info->secFlg;