From f51de018cc3656b6994335cfdf2ec51d8f1cf8c0 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Fri, 19 Oct 2012 14:45:14 -0400 Subject: [PATCH] cifs: extra sanity checking for cifs.idmap keys Now that we aren't so rigid about the length of the key being passed in, we need to be a bit more rigorous about checking the length of the actual data against the claimed length (a'la num_subauths field). Check for the case where userspace sends us a seemingly valid key with a num_subauths field that goes beyond the end of the array. If that happens, return -EIO and invalidate the key. Also change the other places where we check for malformed keys in this code to invalidate the key as well. Signed-off-by: Jeff Layton --- fs/cifs/cifsacl.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index 0c0a5942a5ac..bd187239593a 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -197,6 +197,8 @@ id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) { int rc; struct key *sidkey; + struct cifs_sid *ksid; + unsigned int ksid_size; char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ const struct cred *saved_cred; @@ -217,15 +219,28 @@ id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) rc = -EIO; cFYI(1, "%s: Downcall contained malformed key " "(datalen=%hu)", __func__, sidkey->datalen); - goto out_key_put; + goto invalidate_key; } - cifs_copy_sid(ssid, (struct cifs_sid *)sidkey->payload.data); + + ksid = (struct cifs_sid *)sidkey->payload.data; + ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); + if (ksid_size > sidkey->datalen) { + rc = -EIO; + cFYI(1, "%s: Downcall contained malformed key (datalen=%hu, " + "ksid_size=%u)", __func__, sidkey->datalen, ksid_size); + goto invalidate_key; + } + cifs_copy_sid(ssid, ksid); key_set_timeout(sidkey, cifs_idmap_cache_timeout); out_key_put: key_put(sidkey); out_revert_creds: revert_creds(saved_cred); return rc; + +invalidate_key: + key_invalidate(sidkey); + goto out_key_put; } static int @@ -271,6 +286,7 @@ sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, rc = -EIO; cFYI(1, "%s: Downcall contained malformed key " "(datalen=%hu)", __func__, sidkey->datalen); + key_invalidate(sidkey); goto out_key_put; } -- 2.39.5