elf: Compute correct array size in _dl_init_paths [BZ #22606]

(cherry picked from commit 8a0b17e48b83e933960dfeb8fa08b259f03f310e)

diff --git a/ChangeLog b/ChangeLog
index 90ea98550faec634ce55626d4467180d8e488f4c..772b96ee42b3521276c072ecd7f6651b1e3b3cb1 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2017-12-14  Florian Weimer  <fweimer@redhat.com>
+
+       [BZ #22606]
+       CVE-2017-1000408
+       * elf/dl-load.c (system_dirs): Update comment.
+       (nsystem_dirs_len): Use array_length.
+       (_dl_init_paths): Use nsystem_dirs_len to compute the array size.
+
 2017-11-02  Florian Weimer  <fweimer@redhat.com>
 
        Add array_length and array_end macros.

diff --git a/NEWS b/NEWS
index 8810b57cd9d2ab185b252890570973070c8b600c..437b9ee00f774b9b7d238366ddc85e0d6b351ca0 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -44,6 +44,11 @@ Security related changes:
   instead of NULL.  This was a regression introduced with the new malloc
   thread cache in glibc 2.26.  Reported by Iain Buclaw.
 
+  CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
+  to the allocation of too much memory.  (This is not a security bug per se,
+  it is mentioned here only because of the CVE assignment.)  Reported by
+  Qualys.
+
 The following bugs are resolved with this release:
 
   [16750] ldd: Never run file directly.

diff --git a/elf/dl-load.c b/elf/dl-load.c
index c1b6d4ba0f133409c749944fea989ea89822560d..b3b0b37bf9ade899cd4586bcf726a82f809cadf8 100644 (file)
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -37,6 +37,7 @@
 #include <sysdep.h>
 #include <stap-probe.h>
 #include <libc-pointer-arith.h>
+#include <array_length.h>
 
 #include <dl-dst.h>
 #include <dl-load.h>
@@ -103,7 +104,9 @@ static size_t ncapstr attribute_relro;
 static size_t max_capstrlen attribute_relro;
 
 
-/* Get the generated information about the trusted directories.  */
+/* Get the generated information about the trusted directories.  Use
+   an array of concatenated strings to avoid relocations.  See
+   gen-trusted-dirs.awk.  */
 #include "trusted-dirs.h"
 
 static const char system_dirs[] = SYSTEM_DIRS;
@@ -111,9 +114,7 @@ static const size_t system_dirs_len[] =
 {
   SYSTEM_DIRS_LEN
 };
-#define nsystem_dirs_len \
-  (sizeof (system_dirs_len) / sizeof (system_dirs_len[0]))
-
+#define nsystem_dirs_len array_length (system_dirs_len)
 
 static bool
 is_trusted_path (const char *path, size_t len)
@@ -688,9 +689,8 @@ _dl_init_paths (const char *llp)
                 + ncapstr * sizeof (enum r_dir_status))
                / sizeof (struct r_search_path_elem));
 
-  rtld_search_dirs.dirs[0] = (struct r_search_path_elem *)
-    malloc ((sizeof (system_dirs) / sizeof (system_dirs[0]))
-           * round_size * sizeof (struct r_search_path_elem));
+  rtld_search_dirs.dirs[0] = malloc (nsystem_dirs_len * round_size
+                                    * sizeof (*rtld_search_dirs.dirs[0]));
   if (rtld_search_dirs.dirs[0] == NULL)
     {
       errstring = N_("cannot create cache for search path");