https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-1585
Three patches attached (order matters)
Cheers,
Moritz
commit 4ff67b720c02c36e54d55b88c2931879b7db1cd2
Author: Jeff Layton <jlay...@redhat.com>
Date: Tue Jul 6 20:43:02 2010 -0400
cifs: clean up cifs_find_smb_ses (try #2)
This patch replaces the earlier patch by the same name. The only
difference is that MAX_PASSWORD_SIZE has been increased to attempt to
match the limits that windows enforces.
Do a better job of matching sessions by authtype. Matching by username
for a Kerberos session is incorrect, and anonymous sessions need special
handling.
Also, in the case where we do match by username, we also need to match
by password. That ensures that someone else doesn't "borrow" an existing
session without needing to know the password.
Finally, passwords can be longer than 16 bytes. Bump MAX_PASSWORD_SIZE
to 512 to match the size that the userspace mount helper allows.
Signed-off-by: Jeff Layton <jlay...@redhat.com>
Signed-off-by: Steve French <sfre...@us.ibm.com>
[dannf: backported to Debian's 2.6.32]
diff -urpN linux-source-2.6.32.orig/fs/cifs/cifsglob.h linux-source-2.6.32/fs/cifs/cifsglob.h
--- linux-source-2.6.32.orig/fs/cifs/cifsglob.h 2011-05-03 09:28:59.000000000 -0600
+++ linux-source-2.6.32/fs/cifs/cifsglob.h 2011-05-17 00:55:12.683573674 -0600
@@ -33,7 +33,7 @@
#define MAX_SHARE_SIZE 64 /* used to be 20, this should still be enough */
#define MAX_USERNAME_SIZE 32 /* 32 is to allow for 15 char names + null
termination then *2 for unicode versions */
-#define MAX_PASSWORD_SIZE 16
+#define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */
#define CIFS_MIN_RCV_POOL 4
diff -urpN linux-source-2.6.32.orig/fs/cifs/connect.c linux-source-2.6.32/fs/cifs/connect.c
--- linux-source-2.6.32.orig/fs/cifs/connect.c 2011-05-03 09:29:09.000000000 -0600
+++ linux-source-2.6.32/fs/cifs/connect.c 2011-05-17 00:57:32.409046666 -0600
@@ -1587,17 +1587,27 @@ out_err:
}
static struct cifsSesInfo *
-cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
+cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
{
- struct list_head *tmp;
struct cifsSesInfo *ses;
write_lock(&cifs_tcp_ses_lock);
- list_for_each(tmp, &server->smb_ses_list) {
- ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
- if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
- continue;
-
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ switch (server->secType) {
+ case Kerberos:
+ if (vol->linux_uid != ses->linux_uid)
+ continue;
+ break;
+ default:
+ /* anything else takes username/password */
+ if (strncmp(ses->userName, vol->username,
+ MAX_USERNAME_SIZE))
+ continue;
+ if (strlen(vol->username) != 0 &&
+ strncmp(ses->password, vol->password,
+ MAX_PASSWORD_SIZE))
+ continue;
+ }
++ses->ses_count;
write_unlock(&cifs_tcp_ses_lock);
return ses;
@@ -2356,7 +2366,7 @@ try_mount_again:
goto out;
}
- pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
+ pSesInfo = cifs_find_smb_ses(srvTcp, volume_info);
if (pSesInfo) {
cFYI(1, ("Existing smb sess found (status=%d)",
pSesInfo->status));
commit fc87a40677bbe0937e2ff0642c7e83c9a4813f3d
Author: Jeff Layton <jlay...@redhat.com>
Date: Wed Aug 18 13:13:39 2010 -0400
cifs: fix NULL pointer dereference in cifs_find_smb_ses
cifs_find_smb_ses assumes that the vol->password field is a valid
pointer, but that's only the case if a password was passed in via
the options string. It's possible that one won't be if there is
no mount helper on the box.
Reported-by: diabel <gacek-2...@wp.pl>
Signed-off-by: Jeff Layton <jlay...@redhat.com>
Signed-off-by: Steve French <sfre...@us.ibm.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 95c2ea6..446e248 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1673,7 +1673,8 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
MAX_USERNAME_SIZE))
continue;
if (strlen(vol->username) != 0 &&
- strncmp(ses->password, vol->password,
+ strncmp(ses->password,
+ vol->password ? vol->password : "",
MAX_PASSWORD_SIZE))
continue;
}
commit 24e6cf92fde1f140d8eb0bf7cd24c2c78149b6b2
Author: Jeff Layton <jlay...@redhat.com>
Date: Mon Aug 23 11:38:04 2010 -0400
cifs: check for NULL session password
It's possible for a cifsSesInfo struct to have a NULL password, so we
need to check for that prior to running strncmp on it.
Signed-off-by: Jeff Layton <jlay...@redhat.com>
Signed-off-by: Steve French <sfre...@us.ibm.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 18af707..ec0ea4a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1673,6 +1673,7 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
MAX_USERNAME_SIZE))
continue;
if (strlen(vol->username) != 0 &&
+ ses->password != NULL &&
strncmp(ses->password,
vol->password ? vol->password : "",
MAX_PASSWORD_SIZE))
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