File libplist-boo1029631-32bit.patch of Package libplist.4095

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File libplist-boo1029631-32bit.patch of Package libplist.4095

From dccd9290745345896e3a4a73154576a599fd8b7b Mon Sep 17 00:00:00 2001
From: Nikias Bassen <nikias@gmx.li>
Date: Sun, 26 Mar 2017 20:06:57 +0200
Subject: [PATCH] bplist: Make sure sanity checks work on 32bit platforms

Because on 32-bit platforms 32-bit pointers and 64-bit sizes have been
used for the sanity checks of the offset table and object references,
the range checks would fail in certain interger-overflowish situations,
causing heap buffer overflows or other unwanted behavior.
Fixed by wideing the operands in question to 64-bit.

Backported by Mike Gorse <mgorse@suse.com>
---
diff -urp libplist-1.12.orig/src/bplist.c libplist-1.12/src/bplist.c
--- libplist-1.12.orig/src/bplist.c	2017-05-01 13:03:48.037796333 -0500
+++ libplist-1.12/src/bplist.c	2017-05-02 14:12:25.669352857 -0500
@@ -544,6 +544,8 @@ static plist_t parse_bin_node(struct bpl
 {
     uint16_t type = 0;
     uint64_t size = 0;
+    uint64_t pobject = 0;
+    uint64_t poffset_table = (uint64_t)bplist->offset_table;
 
     if (!object)
         return NULL;
@@ -577,6 +579,8 @@ static plist_t parse_bin_node(struct bpl
         }
     }
 
+    pobject = (uint64_t)*object;
+
     switch (type)
     {
 
@@ -608,12 +612,12 @@ static plist_t parse_bin_node(struct bpl
         }
 
     case BPLIST_UINT:
-        if (*object - bplist->data + (uint64_t)(1 << size) >= bplist->size)
+        if (pobject + (uint64_t)(1 << size) > poffset_table)
             return NULL;
         return parse_uint_node(object, size);
 
     case BPLIST_REAL:
-        if (*object - bplist->data + (uint64_t)(1 << size) >= bplist->size)
+        if (pobject + (uint64_t)(1 << size) > poffset_table)
             return NULL;
         return parse_real_node(object, size);
 
@@ -621,36 +625,38 @@ static plist_t parse_bin_node(struct bpl
         if (3 != size)
             return NULL;
         else
-            if (*object - bplist->data + (uint64_t)(1 << size) >= bplist->size)
+        if (pobject + (uint64_t)(1 << size) > poffset_table)
                 return NULL;
             return parse_date_node(object, size);
 
     case BPLIST_DATA:
-        if (*object - bplist->data + size >= bplist->size)
+        if (pobject + size < pobject || pobject + size > poffset_table)
             return NULL;
         return parse_data_node(object, size);
 
     case BPLIST_STRING:
-        if (*object - bplist->data + size >= bplist->size)
+        if (pobject + size < pobject || pobject + size > poffset_table)
             return NULL;
         return parse_string_node(object, size);
 
     case BPLIST_UNICODE:
-        if (*object - bplist->data + size * 2 >= bplist->size)
+        if (pobject + size*2 < pobject || pobject + size*2 > poffset_table)
             return NULL;
         return parse_unicode_node(object, size);
 
     case BPLIST_SET:
     case BPLIST_ARRAY:
-        if (*object - bplist->data + size >= bplist->size)
+        if (pobject + size < pobject || pobject + size > poffset_table)
             return NULL;
         return parse_array_node(bplist, object, size);
 
     case BPLIST_UID:
+        if (pobject + size+1 > poffset_table)
+            return NULL;
         return parse_uid_node(object, size);
 
     case BPLIST_DICT:
-        if (*object - bplist->data + size >= bplist->size)
+        if (pobject + size < pobject || pobject + size > poffset_table)
             return NULL;
         return parse_dict_node(bplist, object, size);

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File libplist-boo1029631-32bit.patch of Package libplist.4095

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