1 files changed, 132 insertions, 0 deletions
diff --git a/gnu/packages/patches/glib-CVE-2021-27218.patch b/gnu/packages/patches/glib-CVE-2021-27218.patch
new file mode 100644
index 0000000000..00fa5ebf79
--- /dev/null
+++ b/gnu/packages/patches/glib-CVE-2021-27218.patch
@@ -0,0 +1,132 @@
+Backport of:
+
+From 0f384c88a241bbbd884487b1c40b7b75f1e638d3 Mon Sep 17 00:00:00 2001
+From: Krzesimir Nowak <qdlacz@gmail.com>
+Date: Wed, 10 Feb 2021 23:51:07 +0100
+Subject: [PATCH] gbytearray: Do not accept too large byte arrays
+
+GByteArray uses guint for storing the length of the byte array, but it
+also has a constructor (g_byte_array_new_take) that takes length as a
+gsize. gsize may be larger than guint (64 bits for gsize vs 32 bits
+for guint). It is possible to call the function with a value greater
+than G_MAXUINT, which will result in silent length truncation. This
+may happen as a result of unreffing GBytes into GByteArray, so rather
+be loud about it.
+
+(Test case tweaked by Philip Withnall.)
+
+(Backport 2.66: Add #include gstrfuncsprivate.h in the test case for
+`g_memdup2()`.)
+---
+ glib/garray.c      |  6 ++++++
+ glib/gbytes.c      |  4 ++++
+ glib/tests/bytes.c | 35 ++++++++++++++++++++++++++++++++++-
+ 3 files changed, 44 insertions(+), 1 deletion(-)
+
+diff --git a/glib/garray.c b/glib/garray.c
+index 942e74c9f..fb1a42aaf 100644
+--- a/glib/garray.c
++++ b/glib/garray.c
+@@ -2013,6 +2013,10 @@ g_byte_array_new (void)
+  * Create byte array containing the data. The data will be owned by the array
+  * and will be freed with g_free(), i.e. it could be allocated using g_strdup().
+  *
++ * Do not use it if @len is greater than %G_MAXUINT. #GByteArray
++ * stores the length of its data in #guint, which may be shorter than
++ * #gsize.
++ *
+  * Since: 2.32
+  *
+  * Returns: (transfer full): a new #GByteArray
+@@ -2024,6 +2028,8 @@ g_byte_array_new_take (guint8 *data,
+   GByteArray *array;
+   GRealArray *real;
+ 
++  g_return_val_if_fail (len <= G_MAXUINT, NULL);
++
+   array = g_byte_array_new ();
+   real = (GRealArray *)array;
+   g_assert (real->data == NULL);
+diff --git a/glib/gbytes.c b/glib/gbytes.c
+index 7b72886e5..d56abe6c3 100644
+--- a/glib/gbytes.c
++++ b/glib/gbytes.c
+@@ -519,6 +519,10 @@ g_bytes_unref_to_data (GBytes *bytes,
+  * g_bytes_new(), g_bytes_new_take() or g_byte_array_free_to_bytes(). In all
+  * other cases the data is copied.
+  *
++ * Do not use it if @bytes contains more than %G_MAXUINT
++ * bytes. #GByteArray stores the length of its data in #guint, which
++ * may be shorter than #gsize, that @bytes is using.
++ *
+  * Returns: (transfer full): a new mutable #GByteArray containing the same byte data
+  *
+  * Since: 2.32
+diff --git a/glib/tests/bytes.c b/glib/tests/bytes.c
+index 5ea5c2b35..15a6aaad6 100644
+--- a/glib/tests/bytes.c
++++ b/glib/tests/bytes.c
+@@ -10,12 +10,12 @@
+  */
+ 
+ #undef G_DISABLE_ASSERT
+-#undef G_LOG_DOMAIN
+ 
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include "glib.h"
++#include "glib/gstrfuncsprivate.h"
+ 
+ /* Keep in sync with glib/gbytes.c */
+ struct _GBytes
+@@ -333,6 +333,38 @@ test_to_array_transferred (void)
+   g_byte_array_unref (array);
+ }
+ 
++static void
++test_to_array_transferred_oversize (void)
++{
++  g_test_message ("g_bytes_unref_to_array() can only take GBytes up to "
++                  "G_MAXUINT in length; test that longer ones are rejected");
++
++  if (sizeof (guint) >= sizeof (gsize))
++    {
++      g_test_skip ("Skipping test as guint is not smaller than gsize");
++    }
++  else if (g_test_undefined ())
++    {
++      GByteArray *array = NULL;
++      GBytes *bytes = NULL;
++      gpointer data = g_memdup2 (NYAN, N_NYAN);
++      gsize len = ((gsize) G_MAXUINT) + 1;
++
++      bytes = g_bytes_new_take (data, len);
++      g_test_expect_message (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
++                             "g_byte_array_new_take: assertion 'len <= G_MAXUINT' failed");
++      array = g_bytes_unref_to_array (g_steal_pointer (&bytes));
++      g_test_assert_expected_messages ();
++      g_assert_null (array);
++
++      g_free (data);
++    }
++  else
++    {
++      g_test_skip ("Skipping test as testing undefined behaviour is disabled");
++    }
++}
++
+ static void
+ test_to_array_two_refs (void)
+ {
+@@ -410,6 +442,7 @@ main (int argc, char *argv[])
+   g_test_add_func ("/bytes/to-array/transfered", test_to_array_transferred);
+   g_test_add_func ("/bytes/to-array/two-refs", test_to_array_two_refs);
+   g_test_add_func ("/bytes/to-array/non-malloc", test_to_array_non_malloc);
++  g_test_add_func ("/bytes/to-array/transferred/oversize", test_to_array_transferred_oversize);
+   g_test_add_func ("/bytes/null", test_null);
+ 
+   return g_test_run ();
+-- 
+2.30.1
+