netlabel: fix a problem when setting bits below the previously lowest bit

The NetLabel category (catmap) functions have a problem in that they
assume categories will be set in an increasing manner, e.g. the next
category set will always be larger than the last.  Unfortunately, this
is not a valid assumption and could result in problems when attempting
to set categories less than the startbit in the lowest catmap node.
In some cases kernel panics and other nasties can result.

This patch corrects the problem by checking for this and allocating a
new catmap node instance and placing it at the front of the list.

Cc: stable@vger.kernel.org
Reported-by: Christian Evans <frodox@zoho.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Tested-by: Casey Schaufler <casey@schaufler-ca.com>

diff --git a/include/net/netlabel.h b/include/net/netlabel.h
index 4fe018c48ed9fc796545e172cba8e2cea62f21ff..1c40d658d0089de04ed121a0d1fde1180b2a042a 100644 (file)
--- a/include/net/netlabel.h
+++ b/include/net/netlabel.h
@@ -394,10 +394,10 @@ int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
                               u32 offset);
 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
                                   u32 offset);
-int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
+int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap **catmap,
                                 u32 bit,
                                 gfp_t flags);
-int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
+int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap **catmap,
                                 u32 start,
                                 u32 end,
                                 gfp_t flags);
@@ -505,14 +505,14 @@ static inline int netlbl_secattr_catmap_walk_rng(
        return -ENOENT;
 }
 static inline int netlbl_secattr_catmap_setbit(
-                                     struct netlbl_lsm_secattr_catmap *catmap,
+                                     struct netlbl_lsm_secattr_catmap **catmap,
                                      u32 bit,
                                      gfp_t flags)
 {
        return 0;
 }
 static inline int netlbl_secattr_catmap_setrng(
-                                     struct netlbl_lsm_secattr_catmap *catmap,
+                                     struct netlbl_lsm_secattr_catmap **catmap,
                                      u32 start,
                                      u32 end,
                                      gfp_t flags)

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 69e77c8ff285c74a3743cd10b95cfd04a45bf687..dd433c943537eaf6cceda3e0c2a0e119f76e26b2 100644 (file)
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -973,7 +973,7 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
                                return -EPERM;
                        break;
                }
-               ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
+               ret_val = netlbl_secattr_catmap_setbit(&secattr->attr.mls.cat,
                                                       host_spot,
                                                       GFP_ATOMIC);
                if (ret_val != 0)
@@ -1075,7 +1075,7 @@ static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def,
        u32 iter;
 
        for (iter = 0; iter < net_cat_len; iter += 2) {
-               ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat,
+               ret_val = netlbl_secattr_catmap_setbit(&secattr->attr.mls.cat,
                                get_unaligned_be16(&net_cat[iter]),
                                GFP_ATOMIC);
                if (ret_val != 0)
@@ -1217,7 +1217,7 @@ static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def,
                else
                        cat_low = 0;
 
-               ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat,
+               ret_val = netlbl_secattr_catmap_setrng(&secattr->attr.mls.cat,
                                                       cat_low,
                                                       cat_high,
                                                       GFP_ATOMIC);

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 3045a964f39c82152574ef4479e01a0254c88f5a..84e810bef39a7f21eaeaac9e8d7bacc7607bd24d 100644 (file)
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -522,7 +522,7 @@ int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
 
 /**
  * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
- * @catmap: the category bitmap
+ * @catmap: pointer to the category bitmap
  * @bit: the bit to set
  * @flags: memory allocation flags
  *
@@ -531,18 +531,25 @@ int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
  * negative values on failure.
  *
  */
-int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
+int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap **catmap,
                                 u32 bit,
                                 gfp_t flags)
 {
-       struct netlbl_lsm_secattr_catmap *iter = catmap;
+       struct netlbl_lsm_secattr_catmap *iter = *catmap;
        u32 node_bit;
        u32 node_idx;
 
        while (iter->next != NULL &&
               bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
                iter = iter->next;
-       if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
+       if (bit < iter->startbit) {
+               iter = netlbl_secattr_catmap_alloc(flags);
+               if (iter == NULL)
+                       return -ENOMEM;
+               iter->next = *catmap;
+               iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
+               *catmap = iter;
+       } else if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
                iter->next = netlbl_secattr_catmap_alloc(flags);
                if (iter->next == NULL)
                        return -ENOMEM;
@@ -560,7 +567,7 @@ int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
 
 /**
  * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
- * @catmap: the category bitmap
+ * @catmap: pointer to the category bitmap
  * @start: the starting bit
  * @end: the last bit in the string
  * @flags: memory allocation flags
@@ -570,15 +577,16 @@ int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
  * on success, negative values on failure.
  *
  */
-int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
+int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap **catmap,
                                 u32 start,
                                 u32 end,
                                 gfp_t flags)
 {
        int ret_val = 0;
-       struct netlbl_lsm_secattr_catmap *iter = catmap;
+       struct netlbl_lsm_secattr_catmap *iter = *catmap;
        u32 iter_max_spot;
        u32 spot;
+       u32 orig_spot = iter->startbit;
 
        /* XXX - This could probably be made a bit faster by combining writes
         * to the catmap instead of setting a single bit each time, but for
@@ -596,7 +604,9 @@ int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
                        iter = iter->next;
                        iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
                }
-               ret_val = netlbl_secattr_catmap_setbit(iter, spot, flags);
+               ret_val = netlbl_secattr_catmap_setbit(&iter, spot, flags);
+               if (iter->startbit < orig_spot)
+                       *catmap = iter;
        }
 
        return ret_val;

diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 14293cd9b1e53b4a260e9258a5cad54c75d71204..9ecf4f4b67a199ab1cac01cc8f1541de24a9e575 100644 (file)
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -444,7 +444,7 @@ int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
                for (m = 0x80; m != 0; m >>= 1, cat++) {
                        if ((m & *cp) == 0)
                                continue;
-                       rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
+                       rc = netlbl_secattr_catmap_setbit(&sap->attr.mls.cat,
                                                          cat, GFP_ATOMIC);
                        if (rc < 0) {
                                netlbl_secattr_catmap_free(sap->attr.mls.cat);