glib-2.0: Fix CVE-2021-27219

The upstream patches are only in glib >= 2.66.6 and >= 2.67.3 and won't
be backported. This patch is developed based on the upstream patch set
and consulting teh backports recently made by Ubuntu for the 2.64.6
series.

(From OE-Core rev: 513d2a82cc9574983d017a2c0b2de87e181befa5)

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 1445 insertions, 0 deletions

diff --git a/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-27219.patch b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-27219.patch
new file mode 100644
index 0000000000..a4ec01134a
--- /dev/null
+++ b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-27219.patch
@@ -0,0 +1,1444 @@
+commit b70039028b4a39ea071f6ed368a58ad5b5b90ba3
+Author: Anatol Belski <anbelski@microsoft.com>
+Date:   Sun Mar 14 17:51:53 2021 +0000
+
+    backport: 2.64.5_CVE-2021-27219
+
+CVE: CVE-2021-27219
+Upstream-Status: Backport
+[https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1926]
+
+Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
+
+diff --git a/docs/reference/glib/meson.build b/docs/reference/glib/meson.build
+index 62d95f78d..7eebb04ac 100644
+--- a/docs/reference/glib/meson.build
++++ b/docs/reference/glib/meson.build
+@@ -22,6 +22,7 @@ if get_option('gtk_doc')
+     'gprintfint.h',
+     'gmirroringtable.h',
+     'gscripttable.h',
++    'gstrfuncsprivate.h',
+     'glib-mirroring-tab',
+     'gnulib',
+     'pcre',
+diff --git a/gio/gdatainputstream.c b/gio/gdatainputstream.c
+index 2e7750cb5..2cdcbda19 100644
+--- a/gio/gdatainputstream.c
++++ b/gio/gdatainputstream.c
+@@ -27,6 +27,7 @@
+ #include "gioenumtypes.h"
+ #include "gioerror.h"
+ #include "glibintl.h"
++#include "gstrfuncsprivate.h"
+ 
+ #include <string.h>
+ 
+@@ -856,7 +857,7 @@ static gssize
+ scan_for_chars (GDataInputStream *stream,
+                gsize            *checked_out,
+                const char       *stop_chars,
+-                gssize            stop_chars_len)
++                gsize             stop_chars_len)
+ {
+   GBufferedInputStream *bstream;
+   const char *buffer;
+@@ -952,7 +953,7 @@ typedef struct
+   gsize checked;
+ 
+   gchar *stop_chars;
+-  gssize stop_chars_len;
++  gsize stop_chars_len;
+   gsize length;
+ } GDataInputStreamReadData;
+ 
+@@ -1078,12 +1079,17 @@ g_data_input_stream_read_async (GDataInputStream    *stream,
+ {
+   GDataInputStreamReadData *data;
+   GTask *task;
++  gsize stop_chars_len_unsigned;
+ 
+   data = g_slice_new0 (GDataInputStreamReadData);
+-  if (stop_chars_len == -1)
+-    stop_chars_len = strlen (stop_chars);
+-  data->stop_chars = g_memdup (stop_chars, stop_chars_len);
+-  data->stop_chars_len = stop_chars_len;
++
++  if (stop_chars_len < 0)
++    stop_chars_len_unsigned = strlen (stop_chars);
++  else
++    stop_chars_len_unsigned = (gsize) stop_chars_len;
++
++  data->stop_chars = g_memdup2 (stop_chars, stop_chars_len_unsigned);
++  data->stop_chars_len = stop_chars_len_unsigned;
+   data->last_saw_cr = FALSE;
+ 
+   task = g_task_new (stream, cancellable, callback, user_data);
+@@ -1338,17 +1344,20 @@ g_data_input_stream_read_upto (GDataInputStream  *stream,
+   gssize found_pos;
+   gssize res;
+   char *data_until;
++  gsize stop_chars_len_unsigned;
+ 
+   g_return_val_if_fail (G_IS_DATA_INPUT_STREAM (stream), NULL);
+ 
+   if (stop_chars_len < 0)
+-    stop_chars_len = strlen (stop_chars);
++    stop_chars_len_unsigned = strlen (stop_chars);
++  else
++    stop_chars_len_unsigned = (gsize) stop_chars_len;
+ 
+   bstream = G_BUFFERED_INPUT_STREAM (stream);
+ 
+   checked = 0;
+ 
+-  while ((found_pos = scan_for_chars (stream, &checked, stop_chars, stop_chars_len)) == -1)
++  while ((found_pos = scan_for_chars (stream, &checked, stop_chars, stop_chars_len_unsigned)) == -1)
+     {
+       if (g_buffered_input_stream_get_available (bstream) ==
+           g_buffered_input_stream_get_buffer_size (bstream))
+diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
+index 1a4dae3bd..9de661bde 100644
+--- a/gio/gdbusconnection.c
++++ b/gio/gdbusconnection.c
+@@ -110,6 +110,7 @@
+ #include "gasyncinitable.h"
+ #include "giostream.h"
+ #include "gasyncresult.h"
++#include "gstrfuncsprivate.h"
+ #include "gtask.h"
+ #include "gmarshal-internal.h"
+ 
+@@ -4007,7 +4008,7 @@ _g_dbus_interface_vtable_copy (const GDBusInterfaceVTable *vtable)
+   /* Don't waste memory by copying padding - remember to update this
+    * when changing struct _GDBusInterfaceVTable in gdbusconnection.h
+    */
+-  return g_memdup ((gconstpointer) vtable, 3 * sizeof (gpointer));
++  return g_memdup2 ((gconstpointer) vtable, 3 * sizeof (gpointer));
+ }
+ 
+ static void
+@@ -4024,7 +4025,7 @@ _g_dbus_subtree_vtable_copy (const GDBusSubtreeVTable *vtable)
+   /* Don't waste memory by copying padding - remember to update this
+    * when changing struct _GDBusSubtreeVTable in gdbusconnection.h
+    */
+-  return g_memdup ((gconstpointer) vtable, 3 * sizeof (gpointer));
++  return g_memdup2 ((gconstpointer) vtable, 3 * sizeof (gpointer));
+ }
+ 
+ static void
+diff --git a/gio/gdbusinterfaceskeleton.c b/gio/gdbusinterfaceskeleton.c
+index 4a06516c1..4a4b719a5 100644
+--- a/gio/gdbusinterfaceskeleton.c
++++ b/gio/gdbusinterfaceskeleton.c
+@@ -28,6 +28,7 @@
+ #include "gdbusmethodinvocation.h"
+ #include "gdbusconnection.h"
+ #include "gmarshal-internal.h"
++#include "gstrfuncsprivate.h"
+ #include "gtask.h"
+ #include "gioerror.h"
+ 
+@@ -701,7 +702,7 @@ add_connection_locked (GDBusInterfaceSkeleton *interface_,
+        * properly before building the hooked_vtable, so we create it
+        * once at the last minute.
+        */
+-      interface_->priv->hooked_vtable = g_memdup (g_dbus_interface_skeleton_get_vtable (interface_), sizeof (GDBusInterfaceVTable));
++      interface_->priv->hooked_vtable = g_memdup2 (g_dbus_interface_skeleton_get_vtable (interface_), sizeof (GDBusInterfaceVTable));
+       interface_->priv->hooked_vtable->method_call = skeleton_intercept_handle_method_call;
+     }
+ 
+diff --git a/gio/gfile.c b/gio/gfile.c
+index a2ded14ea..25930435f 100644
+--- a/gio/gfile.c
++++ b/gio/gfile.c
+@@ -60,6 +60,7 @@
+ #include "gasyncresult.h"
+ #include "gioerror.h"
+ #include "glibintl.h"
++#include "gstrfuncsprivate.h"
+ 
+ 
+ /**
+@@ -7854,7 +7855,7 @@ measure_disk_usage_progress (gboolean reporting,
+   g_main_context_invoke_full (g_task_get_context (task),
+                               g_task_get_priority (task),
+                               measure_disk_usage_invoke_progress,
+-                              g_memdup (&progress, sizeof progress),
++                              g_memdup2 (&progress, sizeof progress),
+                               g_free);
+ }
+ 
+@@ -7872,7 +7873,7 @@ measure_disk_usage_thread (GTask        *task,
+                                  data->progress_callback ? measure_disk_usage_progress : NULL, task,
+                                  &result.disk_usage, &result.num_dirs, &result.num_files,
+                                  &error))
+-    g_task_return_pointer (task, g_memdup (&result, sizeof result), g_free);
++    g_task_return_pointer (task, g_memdup2 (&result, sizeof result), g_free);
+   else
+     g_task_return_error (task, error);
+ }
+@@ -7896,7 +7897,7 @@ g_file_real_measure_disk_usage_async (GFile                        *file,
+ 
+   task = g_task_new (file, cancellable, callback, user_data);
+   g_task_set_source_tag (task, g_file_real_measure_disk_usage_async);
+-  g_task_set_task_data (task, g_memdup (&data, sizeof data), g_free);
++  g_task_set_task_data (task, g_memdup2 (&data, sizeof data), g_free);
+   g_task_set_priority (task, io_priority);
+ 
+   g_task_run_in_thread (task, measure_disk_usage_thread);
+diff --git a/gio/giowin32-private.c b/gio/giowin32-private.c
+index 7120ae0ea..47e840805 100644
+--- a/gio/giowin32-private.c
++++ b/gio/giowin32-private.c
+@@ -16,11 +16,12 @@
+  * along with this library; if not, see <http://www.gnu.org/licenses/>.
+  */
+ 
++#include "gstrfuncsprivate.h"
+ 
+-static gssize
++static gsize
+ g_utf16_len (const gunichar2 *str)
+ {
+-  gssize result;
++  gsize result;
+ 
+   for (result = 0; str[0] != 0; str++, result++)
+     ;
+@@ -31,17 +32,20 @@ g_utf16_len (const gunichar2 *str)
+ static gunichar2 *
+ g_wcsdup (const gunichar2 *str, gssize str_len)
+ {
+-  gssize str_size;
++  gsize str_len_unsigned;
++  gsize str_size;
+ 
+   g_return_val_if_fail (str != NULL, NULL);
+ 
+-  if (str_len == -1)
+-    str_len = g_utf16_len (str);
++  if (str_len < 0)
++    str_len_unsigned = g_utf16_len (str);
++  else
++    str_len_unsigned = (gsize) str_len;
+ 
+-  g_assert (str_len <= G_MAXSIZE / sizeof (gunichar2) - 1);
+-  str_size = (str_len + 1) * sizeof (gunichar2);
++  g_assert (str_len_unsigned <= G_MAXSIZE / sizeof (gunichar2) - 1);
++  str_size = (str_len_unsigned + 1) * sizeof (gunichar2);
+ 
+-  return g_memdup (str, str_size);
++  return g_memdup2 (str, str_size);
+ }
+ 
+ static const gunichar2 *
+diff --git a/gio/gkeyfilesettingsbackend.c b/gio/gkeyfilesettingsbackend.c
+index cd5765afd..de216e615 100644
+--- a/gio/gkeyfilesettingsbackend.c
++++ b/gio/gkeyfilesettingsbackend.c
+@@ -33,6 +33,7 @@
+ #include "gfilemonitor.h"
+ #include "gsimplepermission.h"
+ #include "gsettingsbackendinternal.h"
++#include "gstrfuncsprivate.h"
+ #include "giomodule-priv.h"
+ #include "gportalsupport.h"
+ 
+@@ -145,8 +146,8 @@ convert_path (GKeyfileSettingsBackend  *kfsb,
+               gchar                   **group,
+               gchar                   **basename)
+ {
+-  gint key_len = strlen (key);
+-  gint i;
++  gsize key_len = strlen (key);
++  const gchar *last_slash;
+ 
+   if (key_len < kfsb->prefix_len ||
+       memcmp (key, kfsb->prefix, kfsb->prefix_len) != 0)
+@@ -155,38 +156,48 @@ convert_path (GKeyfileSettingsBackend  *kfsb,
+   key_len -= kfsb->prefix_len;
+   key += kfsb->prefix_len;
+ 
+-  for (i = key_len; i >= 0; i--)
+-    if (key[i] == '/')
+-      break;
++  last_slash = strrchr (key, '/');
++
++  /* Disallow empty group names or key names */
++  if (key_len == 0 ||
++      (last_slash != NULL &&
++       (*(last_slash + 1) == '\0' ||
++        last_slash == key)))
++    return FALSE;
+ 
+   if (kfsb->root_group)
+     {
+       /* if a root_group was specified, make sure the user hasn't given
+        * a path that ghosts that group name
+        */
+-      if (i == kfsb->root_group_len && memcmp (key, kfsb->root_group, i) == 0)
++      if (last_slash != NULL && (last_slash - key) == kfsb->root_group_len && memcmp (key, kfsb->root_group, last_slash - key) == 0)
+         return FALSE;
+     }
+   else
+     {
+       /* if no root_group was given, ensure that the user gave a path */
+-      if (i == -1)
++      if (last_slash == NULL)
+         return FALSE;
+     }
+ 
+   if (group)
+     {
+-      if (i >= 0)
++      if (last_slash != NULL)
+         {
+-          *group = g_memdup (key, i + 1);
+-          (*group)[i] = '\0';
++          *group = g_memdup2 (key, (last_slash - key) + 1);
++          (*group)[(last_slash - key)] = '\0';
+         }
+       else
+         *group = g_strdup (kfsb->root_group);
+     }
+ 
+   if (basename)
+-    *basename = g_memdup (key + i + 1, key_len - i);
++    {
++      if (last_slash != NULL)
++        *basename = g_memdup2 (last_slash + 1, key_len - (last_slash - key));
++      else
++        *basename = g_strdup (key);
++    }
+ 
+   return TRUE;
+ }
+diff --git a/gio/gsettingsschema.c b/gio/gsettingsschema.c
+index 0b94f76f6..eb5a3b846 100644
+--- a/gio/gsettingsschema.c
++++ b/gio/gsettingsschema.c
+@@ -20,6 +20,7 @@
+ 
+ #include "gsettingsschema-internal.h"
+ #include "gsettings.h"
++#include "gstrfuncsprivate.h"
+ 
+ #include "gvdb/gvdb-reader.h"
+ #include "strinfo.c"
+@@ -1067,9 +1068,9 @@ g_settings_schema_list_children (GSettingsSchema *schema)
+ 
+       if (g_str_has_suffix (key, "/"))
+         {
+-          gint length = strlen (key);
++          gsize length = strlen (key);
+ 
+-          strv[j] = g_memdup (key, length);
++          strv[j] = g_memdup2 (key, length);
+           strv[j][length - 1] = '\0';
+           j++;
+         }
+diff --git a/gio/gsocket.c b/gio/gsocket.c
+index 2a15bdd22..554af026b 100644
+--- a/gio/gsocket.c
++++ b/gio/gsocket.c
+@@ -75,6 +75,7 @@
+ #include "gcredentialsprivate.h"
+ #include "glibintl.h"
+ #include "gioprivate.h"
++#include "gstrfuncsprivate.h"
+ 
+ #ifdef G_OS_WIN32
+ /* For Windows XP runtime compatibility, but use the system's if_nametoindex() if available */
+@@ -174,7 +175,7 @@ static gboolean     g_socket_datagram_based_condition_wait       (GDatagramBased
+                                                                   GError          **error);
+ 
+ static GSocketAddress *
+-cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len);
++cache_recv_address (GSocket *socket, struct sockaddr *native, size_t native_len);
+ 
+ static gssize
+ g_socket_receive_message_with_timeout  (GSocket                 *socket,
+@@ -260,7 +261,7 @@ struct _GSocketPrivate
+   struct {
+     GSocketAddress *addr;
+     struct sockaddr *native;
+-    gint native_len;
++    gsize native_len;
+     guint64 last_used;
+   } recv_addr_cache[RECV_ADDR_CACHE_SIZE];
+ };
+@@ -5259,14 +5260,14 @@ g_socket_send_messages_with_timeout (GSocket        *socket,
+ }
+ 
+ static GSocketAddress *
+-cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
++cache_recv_address (GSocket *socket, struct sockaddr *native, size_t native_len)
+ {
+   GSocketAddress *saddr;
+   gint i;
+   guint64 oldest_time = G_MAXUINT64;
+   gint oldest_index = 0;
+ 
+-  if (native_len <= 0)
++  if (native_len == 0)
+     return NULL;
+ 
+   saddr = NULL;
+@@ -5274,7 +5275,7 @@ cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
+     {
+       GSocketAddress *tmp = socket->priv->recv_addr_cache[i].addr;
+       gpointer tmp_native = socket->priv->recv_addr_cache[i].native;
+-      gint tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
++      gsize tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
+ 
+       if (!tmp)
+         continue;
+@@ -5304,7 +5305,7 @@ cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
+       g_free (socket->priv->recv_addr_cache[oldest_index].native);
+     }
+ 
+-  socket->priv->recv_addr_cache[oldest_index].native = g_memdup (native, native_len);
++  socket->priv->recv_addr_cache[oldest_index].native = g_memdup2 (native, native_len);
+   socket->priv->recv_addr_cache[oldest_index].native_len = native_len;
+   socket->priv->recv_addr_cache[oldest_index].addr = g_object_ref (saddr);
+   socket->priv->recv_addr_cache[oldest_index].last_used = g_get_monotonic_time ();
+@@ -5452,6 +5453,9 @@ g_socket_receive_message_with_timeout (GSocket                 *socket,
+     /* do it */
+     while (1)
+       {
++        /* addrlen has to be of type int because that’s how WSARecvFrom() is defined */
++        G_STATIC_ASSERT (sizeof addr <= G_MAXINT);
++
+        addrlen = sizeof addr;
+        if (address)
+          result = WSARecvFrom (socket->priv->fd,
+diff --git a/gio/gtlspassword.c b/gio/gtlspassword.c
+index 1e437a7b6..bd86a6dfe 100644
+--- a/gio/gtlspassword.c
++++ b/gio/gtlspassword.c
+@@ -23,6 +23,7 @@
+ #include "glibintl.h"
+ 
+ #include "gioenumtypes.h"
++#include "gstrfuncsprivate.h"
+ #include "gtlspassword.h"
+ 
+ #include <string.h>
+@@ -287,9 +288,14 @@ g_tls_password_set_value (GTlsPassword  *password,
+   g_return_if_fail (G_IS_TLS_PASSWORD (password));
+ 
+   if (length < 0)
+-    length = strlen ((gchar *)value);
++    {
++      /* FIXME: g_tls_password_set_value_full() doesn’t support unsigned gsize */
++      gsize length_unsigned = strlen ((gchar *) value);
++      g_return_if_fail (length_unsigned <= G_MAXSSIZE);
++      length = (gssize) length_unsigned;
++    }
+ 
+-  g_tls_password_set_value_full (password, g_memdup (value, length), length, g_free);
++  g_tls_password_set_value_full (password, g_memdup2 (value, (gsize) length), length, g_free);
+ }
+ 
+ /**
+diff --git a/gio/gwin32registrykey.c b/gio/gwin32registrykey.c
+index aa7819294..efb9ae713 100644
+--- a/gio/gwin32registrykey.c
++++ b/gio/gwin32registrykey.c
+@@ -28,6 +28,8 @@
+ #include <ntstatus.h>
+ #include <winternl.h>
+ 
++#include "gstrfuncsprivate.h"
++
+ #ifndef _WDMDDK_
+ typedef enum _KEY_INFORMATION_CLASS {
+   KeyBasicInformation,
+@@ -125,16 +127,34 @@ typedef enum
+   G_WIN32_REGISTRY_UPDATED_PATH = 1,
+ } GWin32RegistryKeyUpdateFlag;
+ 
++static gsize
++g_utf16_len (const gunichar2 *str)
++{
++  gsize result;
++
++  for (result = 0; str[0] != 0; str++, result++)
++    ;
++
++  return result;
++}
++
+ static gunichar2 *
+-g_wcsdup (const gunichar2 *str,
+-          gssize           str_size)
++g_wcsdup (const gunichar2 *str, gssize str_len)
+ {
+-  if (str_size == -1)
+-    {
+-      str_size = wcslen (str) + 1;
+-      str_size *= sizeof (gunichar2);
+-    }
+-  return g_memdup (str, str_size);
++  gsize str_len_unsigned;
++  gsize str_size;
++
++  g_return_val_if_fail (str != NULL, NULL);
++
++  if (str_len < 0)
++    str_len_unsigned = g_utf16_len (str);
++  else
++    str_len_unsigned = (gsize) str_len;
++
++  g_assert (str_len_unsigned <= G_MAXSIZE / sizeof (gunichar2) - 1);
++  str_size = (str_len_unsigned + 1) * sizeof (gunichar2);
++
++  return g_memdup2 (str, str_size);
+ }
+ 
+ /**
+@@ -247,7 +267,7 @@ g_win32_registry_value_iter_copy (const GWin32RegistryValueIter *iter)
+   new_iter->value_name_size = iter->value_name_size;
+ 
+   if (iter->value_data != NULL)
+-    new_iter->value_data = g_memdup (iter->value_data, iter->value_data_size);
++    new_iter->value_data = g_memdup2 (iter->value_data, iter->value_data_size);
+ 
+   new_iter->value_data_size = iter->value_data_size;
+ 
+@@ -268,8 +288,8 @@ g_win32_registry_value_iter_copy (const GWin32RegistryValueIter *iter)
+   new_iter->value_data_expanded_charsize = iter->value_data_expanded_charsize;
+ 
+   if (iter->value_data_expanded_u8 != NULL)
+-    new_iter->value_data_expanded_u8 = g_memdup (iter->value_data_expanded_u8,
+-                                                 iter->value_data_expanded_charsize);
++    new_iter->value_data_expanded_u8 = g_memdup2 (iter->value_data_expanded_u8,
++                                                  iter->value_data_expanded_charsize);
+ 
+   new_iter->value_data_expanded_u8_size = iter->value_data_expanded_charsize;
+ 
+diff --git a/gio/tests/async-close-output-stream.c b/gio/tests/async-close-output-stream.c
+index 5f6620275..d3f97a119 100644
+--- a/gio/tests/async-close-output-stream.c
++++ b/gio/tests/async-close-output-stream.c
+@@ -24,6 +24,8 @@
+ #include <stdlib.h>
+ #include <string.h>
+ 
++#include "gstrfuncsprivate.h"
++
+ #define DATA_TO_WRITE "Hello world\n"
+ 
+ typedef struct
+@@ -147,9 +149,9 @@ prepare_data (SetupData *data,
+ 
+   data->expected_size = g_memory_output_stream_get_data_size (G_MEMORY_OUTPUT_STREAM (data->data_stream));
+ 
+-  g_assert_cmpint (data->expected_size, >, 0);
++  g_assert_cmpuint (data->expected_size, >, 0);
+ 
+-  data->expected_output = g_memdup (written, (guint)data->expected_size);
++  data->expected_output = g_memdup2 (written, data->expected_size);
+ 
+   /* then recreate the streams and prepare them for the asynchronous close */
+   destroy_streams (data);
+diff --git a/gio/tests/gdbus-export.c b/gio/tests/gdbus-export.c
+index fda654c44..10dd6d82f 100644
+--- a/gio/tests/gdbus-export.c
++++ b/gio/tests/gdbus-export.c
+@@ -23,6 +23,7 @@
+ #include <string.h>
+ 
+ #include "gdbus-tests.h"
++#include "gstrfuncsprivate.h"
+ 
+ /* all tests rely on a shared mainloop */
+ static GMainLoop *loop = NULL;
+@@ -671,7 +672,7 @@ subtree_introspect (GDBusConnection       *connection,
+       g_assert_not_reached ();
+     }
+ 
+-  return g_memdup (interfaces, 2 * sizeof (void *));
++  return g_memdup2 (interfaces, 2 * sizeof (void *));
+ }
+ 
+ static const GDBusInterfaceVTable *
+@@ -727,7 +728,7 @@ dynamic_subtree_introspect (GDBusConnection       *connection,
+ {
+   const GDBusInterfaceInfo *interfaces[2] = { &dyna_interface_info, NULL };
+ 
+-  return g_memdup (interfaces, 2 * sizeof (void *));
++  return g_memdup2 (interfaces, 2 * sizeof (void *));
+ }
+ 
+ static const GDBusInterfaceVTable *
+diff --git a/gio/tests/gsettings.c b/gio/tests/gsettings.c
+index baadca8f5..afe594a23 100644
+--- a/gio/tests/gsettings.c
++++ b/gio/tests/gsettings.c
+@@ -1,3 +1,4 @@
++#include <errno.h>
+ #include <stdlib.h>
+ #include <locale.h>
+ #include <libintl.h>
+@@ -1740,6 +1741,14 @@ key_changed_cb (GSettings *settings, const gchar *key, gpointer data)
+   (*b) = TRUE;
+ }
+ 
++typedef struct
++{
++  const gchar *path;
++  const gchar *root_group;
++  const gchar *keyfile_group;
++  const gchar *root_path;
++} KeyfileTestData;
++
+ /*
+  * Test that using a keyfile works
+  */
+@@ -1834,7 +1843,11 @@ test_keyfile (Fixture       *fixture,
+   g_free (str);
+ 
+   g_settings_set (settings, "farewell", "s", "cheerio");
+-  
++
++  /* Check that empty keys/groups are not allowed. */
++  g_assert_false (g_settings_is_writable (settings, ""));
++  g_assert_false (g_settings_is_writable (settings, "/"));
++
+   /* When executing as root, changing the mode of the keyfile will have
+    * no effect on the writability of the settings.
+    */
+@@ -1866,6 +1879,149 @@ test_keyfile (Fixture       *fixture,
+   g_free (keyfile_path);
+ }
+ 
++/*
++ * Test that using a keyfile works with a schema with no path set.
++ */
++static void
++test_keyfile_no_path (Fixture       *fixture,
++                      gconstpointer  user_data)
++{
++  const KeyfileTestData *test_data = user_data;
++  GSettingsBackend *kf_backend;
++  GSettings *settings;
++  GKeyFile *keyfile;
++  gboolean writable;
++  gchar *key = NULL;
++  GError *error = NULL;
++  gchar *keyfile_path = NULL, *store_path = NULL;
++
++  keyfile_path = g_build_filename (fixture->tmp_dir, "keyfile", NULL);
++  store_path = g_build_filename (keyfile_path, "gsettings.store", NULL);
++  kf_backend = g_keyfile_settings_backend_new (store_path, test_data->root_path, test_data->root_group);
++  settings = g_settings_new_with_backend_and_path ("org.gtk.test.no-path", kf_backend, test_data->path);
++  g_object_unref (kf_backend);
++
++  g_settings_reset (settings, "test-boolean");
++  g_assert_true (g_settings_get_boolean (settings, "test-boolean"));
++
++  writable = g_settings_is_writable (settings, "test-boolean");
++  g_assert_true (writable);
++  g_settings_set (settings, "test-boolean", "b", FALSE);
++
++  g_assert_false (g_settings_get_boolean (settings, "test-boolean"));
++
++  g_settings_delay (settings);
++  g_settings_set (settings, "test-boolean", "b", TRUE);
++  g_settings_apply (settings);
++
++  keyfile = g_key_file_new ();
++  g_assert_true (g_key_file_load_from_file (keyfile, store_path, 0, NULL));
++
++  g_assert_true (g_key_file_get_boolean (keyfile, test_data->keyfile_group, "test-boolean", NULL));
++
++  g_key_file_free (keyfile);
++
++  g_settings_reset (settings, "test-boolean");
++  g_settings_apply (settings);
++  keyfile = g_key_file_new ();
++  g_assert_true (g_key_file_load_from_file (keyfile, store_path, 0, NULL));
++
++  g_assert_false (g_key_file_get_string (keyfile, test_data->keyfile_group, "test-boolean", &error));
++  g_assert_error (error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND);
++  g_clear_error (&error);
++
++  /* Check that empty keys/groups are not allowed. */
++  g_assert_false (g_settings_is_writable (settings, ""));
++  g_assert_false (g_settings_is_writable (settings, "/"));
++
++  /* Keys which ghost the root group name are not allowed. This can only be
++   * tested when the path is `/` as otherwise it acts as a prefix and prevents
++   * any ghosting. */
++  if (g_str_equal (test_data->path, "/"))
++    {
++      key = g_strdup_printf ("%s/%s", test_data->root_group, "");
++      g_assert_false (g_settings_is_writable (settings, key));
++      g_free (key);
++
++      key = g_strdup_printf ("%s/%s", test_data->root_group, "/");
++      g_assert_false (g_settings_is_writable (settings, key));
++      g_free (key);
++
++      key = g_strdup_printf ("%s/%s", test_data->root_group, "test-boolean");
++      g_assert_false (g_settings_is_writable (settings, key));
++      g_free (key);
++    }
++
++  g_key_file_free (keyfile);
++  g_object_unref (settings);
++
++  /* Clean up the temporary directory. */
++  g_assert_cmpint (g_chmod (keyfile_path, 0777) == 0 ? 0 : errno, ==, 0);
++  g_assert_cmpint (g_remove (store_path) == 0 ? 0 : errno, ==, 0);
++  g_assert_cmpint (g_rmdir (keyfile_path) == 0 ? 0 : errno, ==, 0);
++  g_free (store_path);
++  g_free (keyfile_path);
++}
++
++/*
++ * Test that a keyfile rejects writes to keys outside its root path.
++ */
++static void
++test_keyfile_outside_root_path (Fixture       *fixture,
++                                gconstpointer  user_data)
++{
++  GSettingsBackend *kf_backend;
++  GSettings *settings;
++  gchar *keyfile_path = NULL, *store_path = NULL;
++
++  keyfile_path = g_build_filename (fixture->tmp_dir, "keyfile", NULL);
++  store_path = g_build_filename (keyfile_path, "gsettings.store", NULL);
++  kf_backend = g_keyfile_settings_backend_new (store_path, "/tests/basic-types/", "root");
++  settings = g_settings_new_with_backend_and_path ("org.gtk.test.no-path", kf_backend, "/tests/");
++  g_object_unref (kf_backend);
++
++  g_assert_false (g_settings_is_writable (settings, "test-boolean"));
++
++  g_object_unref (settings);
++
++  /* Clean up the temporary directory. The keyfile probably doesn’t exist, so
++   * don’t error on failure. */
++  g_remove (store_path);
++  g_assert_cmpint (g_rmdir (keyfile_path) == 0 ? 0 : errno, ==, 0);
++  g_free (store_path);
++  g_free (keyfile_path);
++}
++
++/*
++ * Test that a keyfile rejects writes to keys in the root if no root group is set.
++ */
++static void
++test_keyfile_no_root_group (Fixture       *fixture,
++                            gconstpointer  user_data)
++{
++  GSettingsBackend *kf_backend;
++  GSettings *settings;
++  gchar *keyfile_path = NULL, *store_path = NULL;
++
++  keyfile_path = g_build_filename (fixture->tmp_dir, "keyfile", NULL);
++  store_path = g_build_filename (keyfile_path, "gsettings.store", NULL);
++  kf_backend = g_keyfile_settings_backend_new (store_path, "/", NULL);
++  settings = g_settings_new_with_backend_and_path ("org.gtk.test.no-path", kf_backend, "/");
++  g_object_unref (kf_backend);
++
++  g_assert_false (g_settings_is_writable (settings, "test-boolean"));
++  g_assert_true (g_settings_is_writable (settings, "child/test-boolean"));
++
++  g_object_unref (settings);
++
++  /* Clean up the temporary directory. The keyfile probably doesn’t exist, so
++   * don’t error on failure. */
++  g_remove (store_path);
++  g_assert_cmpint (g_rmdir (keyfile_path) == 0 ? 0 : errno, ==, 0);
++  g_free (store_path);
++  g_free (keyfile_path);
++}
++
+ /* Test that getting child schemas works
+  */
+ static void
+@@ -2844,6 +3000,14 @@ main (int argc, char *argv[])
+   gchar *override_text;
+   gchar *enums;
+   gint result;
++  const KeyfileTestData keyfile_test_data_explicit_path = { "/tests/", "root", "tests", "/" };
++  const KeyfileTestData keyfile_test_data_empty_path = { "/", "root", "root", "/" };
++  const KeyfileTestData keyfile_test_data_long_path = {
++    "/tests/path/is/very/long/and/this/makes/some/comparisons/take/a/different/branch/",
++    "root",
++    "tests/path/is/very/long/and/this/makes/some/comparisons/take/a/different/branch",
++    "/"
++  };
+ 
+ /* Meson build sets this */
+ #ifdef TEST_LOCALE_PATH
+@@ -2967,6 +3131,11 @@ main (int argc, char *argv[])
+     }
+ 
+   g_test_add ("/gsettings/keyfile", Fixture, NULL, setup, test_keyfile, teardown);
++  g_test_add ("/gsettings/keyfile/explicit-path", Fixture, &keyfile_test_data_explicit_path, setup, test_keyfile_no_path, teardown);
++  g_test_add ("/gsettings/keyfile/empty-path", Fixture, &keyfile_test_data_empty_path, setup, test_keyfile_no_path, teardown);
++  g_test_add ("/gsettings/keyfile/long-path", Fixture, &keyfile_test_data_long_path, setup, test_keyfile_no_path, teardown);
++  g_test_add ("/gsettings/keyfile/outside-root-path", Fixture, NULL, setup, test_keyfile_outside_root_path, teardown);
++  g_test_add ("/gsettings/keyfile/no-root-group", Fixture, NULL, setup, test_keyfile_no_root_group, teardown);
+   g_test_add_func ("/gsettings/child-schema", test_child_schema);
+   g_test_add_func ("/gsettings/strinfo", test_strinfo);
+   g_test_add_func ("/gsettings/enums", test_enums);
+diff --git a/gio/tests/tls-interaction.c b/gio/tests/tls-interaction.c
+index 4f0737d7e..5661e8e0d 100644
+--- a/gio/tests/tls-interaction.c
++++ b/gio/tests/tls-interaction.c
+@@ -174,6 +174,38 @@ test_interaction_ask_password_finish_failure (GTlsInteraction    *interaction,
+ }
+ 
+ 
++/* Return a copy of @str that is allocated in a silly way, to exercise
++ * custom free-functions. The returned pointer points to a copy of @str
++ * in a buffer of the form "BEFORE \0 str \0 AFTER". */
++static guchar *
++special_dup (const char *str)
++{
++  GString *buf = g_string_new ("BEFORE");
++  guchar *ret;
++
++  g_string_append_c (buf, '\0');
++  g_string_append (buf, str);
++  g_string_append_c (buf, '\0');
++  g_string_append (buf, "AFTER");
++  ret = (guchar *) g_string_free (buf, FALSE);
++  return ret + strlen ("BEFORE") + 1;
++}
++
++
++/* Free a copy of @str that was made with special_dup(), after asserting
++ * that it has not been corrupted. */
++static void
++special_free (gpointer p)
++{
++  gchar *s = p;
++  gchar *buf = s - strlen ("BEFORE") - 1;
++
++  g_assert_cmpstr (buf, ==, "BEFORE");
++  g_assert_cmpstr (s + strlen (s) + 1, ==, "AFTER");
++  g_free (buf);
++}
++
++
+ static GTlsInteractionResult
+ test_interaction_ask_password_sync_success (GTlsInteraction    *interaction,
+                                             GTlsPassword       *password,
+@@ -181,6 +213,8 @@ test_interaction_ask_password_sync_success (GTlsInteraction    *interaction,
+                                             GError            **error)
+ {
+   TestInteraction *self;
++  const guchar *value;
++  gsize len;
+ 
+   g_assert (TEST_IS_INTERACTION (interaction));
+   self = TEST_INTERACTION (interaction);
+@@ -192,6 +226,27 @@ test_interaction_ask_password_sync_success (GTlsInteraction    *interaction,
+   g_assert (error != NULL);
+   g_assert (*error == NULL);
+ 
++  /* Exercise different ways to set the value */
++  g_tls_password_set_value (password, (const guchar *) "foo", 4);
++  len = 0;
++  value = g_tls_password_get_value (password, &len);
++  g_assert_cmpmem (value, len, "foo", 4);
++
++  g_tls_password_set_value (password, (const guchar *) "bar", -1);
++  len = 0;
++  value = g_tls_password_get_value (password, &len);
++  g_assert_cmpmem (value, len, "bar", 3);
++
++  g_tls_password_set_value_full (password, special_dup ("baa"), 4, special_free);
++  len = 0;
++  value = g_tls_password_get_value (password, &len);
++  g_assert_cmpmem (value, len, "baa", 4);
++
++  g_tls_password_set_value_full (password, special_dup ("baz"), -1, special_free);
++  len = 0;
++  value = g_tls_password_get_value (password, &len);
++  g_assert_cmpmem (value, len, "baz", 3);
++
+   /* Don't do this in real life. Include a null terminator for testing */
+   g_tls_password_set_value (password, (const guchar *)"the password", 13);
+   return G_TLS_INTERACTION_HANDLED;
+diff --git a/gio/win32/gwinhttpfile.c b/gio/win32/gwinhttpfile.c
+index cf5eed31d..246ec0578 100644
+--- a/gio/win32/gwinhttpfile.c
++++ b/gio/win32/gwinhttpfile.c
+@@ -29,6 +29,7 @@
+ #include "gio/gfile.h"
+ #include "gio/gfileattribute.h"
+ #include "gio/gfileinfo.h"
++#include "gstrfuncsprivate.h"
+ #include "gwinhttpfile.h"
+ #include "gwinhttpfileinputstream.h"
+ #include "gwinhttpfileoutputstream.h"
+@@ -393,10 +394,10 @@ g_winhttp_file_resolve_relative_path (GFile      *file,
+   child = g_object_new (G_TYPE_WINHTTP_FILE, NULL);
+   child->vfs = winhttp_file->vfs;
+   child->url = winhttp_file->url;
+-  child->url.lpszScheme = g_memdup (winhttp_file->url.lpszScheme, (winhttp_file->url.dwSchemeLength+1)*2);
+-  child->url.lpszHostName = g_memdup (winhttp_file->url.lpszHostName, (winhttp_file->url.dwHostNameLength+1)*2);
+-  child->url.lpszUserName = g_memdup (winhttp_file->url.lpszUserName, (winhttp_file->url.dwUserNameLength+1)*2);
+-  child->url.lpszPassword = g_memdup (winhttp_file->url.lpszPassword, (winhttp_file->url.dwPasswordLength+1)*2);
++  child->url.lpszScheme = g_memdup2 (winhttp_file->url.lpszScheme, ((gsize) winhttp_file->url.dwSchemeLength + 1) * 2);
++  child->url.lpszHostName = g_memdup2 (winhttp_file->url.lpszHostName, ((gsize) winhttp_file->url.dwHostNameLength + 1) * 2);
++  child->url.lpszUserName = g_memdup2 (winhttp_file->url.lpszUserName, ((gsize) winhttp_file->url.dwUserNameLength + 1) * 2);
++  child->url.lpszPassword = g_memdup2 (winhttp_file->url.lpszPassword, ((gsize) winhttp_file->url.dwPasswordLength + 1) * 2);
+   child->url.lpszUrlPath = wnew_path;
+   child->url.dwUrlPathLength = wcslen (wnew_path);
+   child->url.lpszExtraInfo = NULL;
+diff --git a/glib/gbytes.c b/glib/gbytes.c
+index ec6923188..6f17d104c 100644
+--- a/glib/gbytes.c
++++ b/glib/gbytes.c
+@@ -34,6 +34,8 @@
+ 
+ #include <string.h>
+ 
++#include "gstrfuncsprivate.h"
++
+ /**
+  * GBytes:
+  *
+@@ -95,7 +97,7 @@ g_bytes_new (gconstpointer data,
+ {
+   g_return_val_if_fail (data != NULL || size == 0, NULL);
+ 
+-  return g_bytes_new_take (g_memdup (data, size), size);
++  return g_bytes_new_take (g_memdup2 (data, size), size);
+ }
+ 
+ /**
+@@ -499,7 +501,7 @@ g_bytes_unref_to_data (GBytes *bytes,
+        * Copy: Non g_malloc (or compatible) allocator, or static memory,
+        * so we have to copy, and then unref.
+        */
+-      result = g_memdup (bytes->data, bytes->size);
++      result = g_memdup2 (bytes->data, bytes->size);
+       *size = bytes->size;
+       g_bytes_unref (bytes);
+     }
+diff --git a/glib/gdir.c b/glib/gdir.c
+index 6b85e99c8..6747a8c6f 100644
+--- a/glib/gdir.c
++++ b/glib/gdir.c
+@@ -37,6 +37,7 @@
+ #include "gconvert.h"
+ #include "gfileutils.h"
+ #include "gstrfuncs.h"
++#include "gstrfuncsprivate.h"
+ #include "gtestutils.h"
+ #include "glibintl.h"
+ 
+@@ -112,7 +113,7 @@ g_dir_open_with_errno (const gchar *path,
+     return NULL;
+ #endif
+ 
+-  return g_memdup (&dir, sizeof dir);
++  return g_memdup2 (&dir, sizeof dir);
+ }
+ 
+ /**
+diff --git a/glib/ghash.c b/glib/ghash.c
+index 0f1562a06..c1e15c957 100644
+--- a/glib/ghash.c
++++ b/glib/ghash.c
+@@ -34,6 +34,7 @@
+ #include "gmacros.h"
+ #include "glib-private.h"
+ #include "gstrfuncs.h"
++#include "gstrfuncsprivate.h"
+ #include "gatomic.h"
+ #include "gtestutils.h"
+ #include "gslice.h"
+@@ -962,7 +963,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
+       if (hash_table->have_big_keys)
+         {
+           if (key != value)
+-            hash_table->values = g_memdup (hash_table->keys, sizeof (gpointer) * hash_table->size);
++            hash_table->values = g_memdup2 (hash_table->keys, sizeof (gpointer) * hash_table->size);
+           /* Keys and values are both big now, so no need for further checks */
+           return;
+         }
+@@ -970,7 +971,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
+         {
+           if (key != value)
+             {
+-              hash_table->values = g_memdup (hash_table->keys, sizeof (guint) * hash_table->size);
++              hash_table->values = g_memdup2 (hash_table->keys, sizeof (guint) * hash_table->size);
+               is_a_set = FALSE;
+             }
+         }
+@@ -998,7 +999,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
+ 
+   /* Just split if necessary */
+   if (is_a_set && key != value)
+-    hash_table->values = g_memdup (hash_table->keys, sizeof (gpointer) * hash_table->size);
++    hash_table->values = g_memdup2 (hash_table->keys, sizeof (gpointer) * hash_table->size);
+ 
+ #endif
+ }
+diff --git a/glib/giochannel.c b/glib/giochannel.c
+index d16399846..b41381d38 100644
+--- a/glib/giochannel.c
++++ b/glib/giochannel.c
+@@ -37,6 +37,7 @@
+ #include "giochannel.h"
+ 
+ #include "gstrfuncs.h"
++#include "gstrfuncsprivate.h"
+ #include "gtestutils.h"
+ #include "glibintl.h"
+ 
+@@ -886,17 +887,26 @@ g_io_channel_set_line_term (GIOChannel    *channel,
+                             const gchar        *line_term,
+                            gint         length)
+ {
++  guint length_unsigned;
++
+   g_return_if_fail (channel != NULL);
+   g_return_if_fail (line_term == NULL || length != 0); /* Disallow "" */
+ 
+   if (line_term == NULL)
+-    length = 0;
+-  else if (length < 0)
+-    length = strlen (line_term);
++    length_unsigned = 0;
++  else if (length >= 0)
++    length_unsigned = (guint) length;
++  else
++    {
++      /* FIXME: We’re constrained by line_term_len being a guint here */
++      gsize length_size = strlen (line_term);
++      g_return_if_fail (length_size <= G_MAXUINT);
++      length_unsigned = (guint) length_size;
++    }
+ 
+   g_free (channel->line_term);
+-  channel->line_term = line_term ? g_memdup (line_term, length) : NULL;
+-  channel->line_term_len = length;
++  channel->line_term = line_term ? g_memdup2 (line_term, length_unsigned) : NULL;
++  channel->line_term_len = length_unsigned;
+ }
+ 
+ /**
+@@ -1673,10 +1683,10 @@ g_io_channel_read_line (GIOChannel  *channel,
+ 
+       /* Copy the read bytes (including any embedded nuls) and nul-terminate.
+        * `USE_BUF (channel)->str` is guaranteed to be nul-terminated as it’s a
+-       * #GString, so it’s safe to call g_memdup() with +1 length to allocate
++       * #GString, so it’s safe to call g_memdup2() with +1 length to allocate
+        * a nul-terminator. */
+       g_assert (USE_BUF (channel));
+-      line = g_memdup (USE_BUF (channel)->str, got_length + 1);
++      line = g_memdup2 (USE_BUF (channel)->str, got_length + 1);
+       line[got_length] = '\0';
+       *str_return = g_steal_pointer (&line);
+       g_string_erase (USE_BUF (channel), 0, got_length);
+diff --git a/glib/gslice.c b/glib/gslice.c
+index 4c758c3be..bcdbb8853 100644
+--- a/glib/gslice.c
++++ b/glib/gslice.c
+@@ -41,6 +41,7 @@
+ #include "gmain.h"
+ #include "gmem.h"               /* gslice.h */
+ #include "gstrfuncs.h"
++#include "gstrfuncsprivate.h"
+ #include "gutils.h"
+ #include "gtrashstack.h"
+ #include "gtestutils.h"
+@@ -350,7 +351,7 @@ g_slice_get_config_state (GSliceConfig ckey,
+       array[i++] = allocator->contention_counters[address];
+       array[i++] = allocator_get_magazine_threshold (allocator, address);
+       *n_values = i;
+-      return g_memdup (array, sizeof (array[0]) * *n_values);
++      return g_memdup2 (array, sizeof (array[0]) * *n_values);
+     default:
+       return NULL;
+     }
+diff --git a/glib/gstrfuncsprivate.h b/glib/gstrfuncsprivate.h
+new file mode 100644
+index 000000000..85c88328a
+--- /dev/null
++++ b/glib/gstrfuncsprivate.h
+@@ -0,0 +1,55 @@
++/* GLIB - Library of useful routines for C programming
++ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
++ *
++ * This library is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; either
++ * version 2.1 of the License, or (at your option) any later version.
++ *
++ * This library is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++ * Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General Public
++ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
++ */
++
++#include <glib.h>
++#include <string.h>
++
++/*
++ * g_memdup2:
++ * @mem: (nullable): the memory to copy.
++ * @byte_size: the number of bytes to copy.
++ *
++ * Allocates @byte_size bytes of memory, and copies @byte_size bytes into it
++ * from @mem. If @mem is %NULL it returns %NULL.
++ *
++ * This replaces g_memdup(), which was prone to integer overflows when
++ * converting the argument from a #gsize to a #guint.
++ *
++ * This static inline version is a backport of the new public API from
++ * GLib 2.68, kept internal to GLib for backport to older stable releases.
++ * See https://gitlab.gnome.org/GNOME/glib/-/issues/2319.
++ *
++ * Returns: (nullable): a pointer to the newly-allocated copy of the memory,
++ *    or %NULL if @mem is %NULL.
++ * Since: 2.68
++ */
++static inline gpointer
++g_memdup2 (gconstpointer mem,
++           gsize         byte_size)
++{
++  gpointer new_mem;
++
++  if (mem && byte_size != 0)
++    {
++      new_mem = g_malloc (byte_size);
++      memcpy (new_mem, mem, byte_size);
++    }
++  else
++    new_mem = NULL;
++
++  return new_mem;
++}
+diff --git a/glib/gtestutils.c b/glib/gtestutils.c
+index 18b117285..26d46ad75 100644
+--- a/glib/gtestutils.c
++++ b/glib/gtestutils.c
+@@ -49,6 +49,7 @@
+ #include "gpattern.h"
+ #include "grand.h"
+ #include "gstrfuncs.h"
++#include "gstrfuncsprivate.h"
+ #include "gtimer.h"
+ #include "gslice.h"
+ #include "gspawn.h"
+@@ -3803,7 +3804,7 @@ g_test_log_extract (GTestLogBuffer *tbuffer)
+       if (p <= tbuffer->data->str + mlength)
+         {
+           g_string_erase (tbuffer->data, 0, mlength);
+-          tbuffer->msgs = g_slist_prepend (tbuffer->msgs, g_memdup (&msg, sizeof (msg)));
++          tbuffer->msgs = g_slist_prepend (tbuffer->msgs, g_memdup2 (&msg, sizeof (msg)));
+           return TRUE;
+         }
+ 
+diff --git a/glib/gvariant.c b/glib/gvariant.c
+index 77d7e746b..ef4257f6d 100644
+--- a/glib/gvariant.c
++++ b/glib/gvariant.c
+@@ -33,6 +33,7 @@
+ 
+ #include <string.h>
+ 
++#include "gstrfuncsprivate.h"
+ 
+ /**
+  * SECTION:gvariant
+@@ -725,7 +726,7 @@ g_variant_new_variant (GVariant *value)
+   g_variant_ref_sink (value);
+ 
+   return g_variant_new_from_children (G_VARIANT_TYPE_VARIANT,
+-                                      g_memdup (&value, sizeof value),
++                                      g_memdup2 (&value, sizeof value),
+                                       1, g_variant_is_trusted (value));
+ }
+ 
+@@ -1229,7 +1230,7 @@ g_variant_new_fixed_array (const GVariantType  *element_type,
+       return NULL;
+     }
+ 
+-  data = g_memdup (elements, n_elements * element_size);
++  data = g_memdup2 (elements, n_elements * element_size);
+   value = g_variant_new_from_data (array_type, data,
+                                    n_elements * element_size,
+                                    FALSE, g_free, data);
+@@ -1908,7 +1909,7 @@ g_variant_dup_bytestring (GVariant *value,
+   if (length)
+     *length = size;
+ 
+-  return g_memdup (original, size + 1);
++  return g_memdup2 (original, size + 1);
+ }
+ 
+ /**
+diff --git a/glib/gvarianttype.c b/glib/gvarianttype.c
+index c46f1a2c6..585e29ab2 100644
+--- a/glib/gvarianttype.c
++++ b/glib/gvarianttype.c
+@@ -28,6 +28,7 @@
+ 
+ #include <string.h>
+ 
++#include "gstrfuncsprivate.h"
+ 
+ /**
+  * SECTION:gvarianttype
+@@ -1181,7 +1182,7 @@ g_variant_type_new_tuple (const GVariantType * const *items,
+   g_assert (offset < sizeof buffer);
+   buffer[offset++] = ')';
+ 
+-  return (GVariantType *) g_memdup (buffer, offset);
++  return (GVariantType *) g_memdup2 (buffer, offset);
+ }
+ 
+ /**
+diff --git a/glib/meson.build b/glib/meson.build
+index 456e0c2a1..2e5cd77bb 100644
+--- a/glib/meson.build
++++ b/glib/meson.build
+@@ -268,6 +268,7 @@ glib_sources = files(
+   'gslist.c',
+   'gstdio.c',
+   'gstrfuncs.c',
++  'gstrfuncsprivate.h',
+   'gstring.c',
+   'gstringchunk.c',
+   'gtestutils.c',
+diff --git a/glib/tests/array-test.c b/glib/tests/array-test.c
+index 1da514a3e..88f22de80 100644
+--- a/glib/tests/array-test.c
++++ b/glib/tests/array-test.c
+@@ -29,6 +29,8 @@
+ #include <string.h>
+ #include "glib.h"
+ 
++#include "gstrfuncsprivate.h"
++
+ /* Test data to be passed to any function which calls g_array_new(), providing
+  * the parameters for that call. Most #GArray tests should be repeated for all
+  * possible values of #ArrayTestData. */
+@@ -1917,7 +1919,7 @@ byte_array_new_take (void)
+   GByteArray *gbarray;
+   guint8 *data;
+ 
+-  data = g_memdup ("woooweeewow", 11);
++  data = g_memdup2 ("woooweeewow", 11);
+   gbarray = g_byte_array_new_take (data, 11);
+   g_assert (gbarray->data == data);
+   g_assert_cmpuint (gbarray->len, ==, 11);
+diff --git a/glib/tests/io-channel.c b/glib/tests/io-channel.c
+index ff53fcef7..4a1b10876 100644
+--- a/glib/tests/io-channel.c
++++ b/glib/tests/io-channel.c
+@@ -49,8 +49,10 @@ test_read_line_embedded_nuls (void)
+   channel = g_io_channel_new_file (filename, "r", &local_error);
+   g_assert_no_error (local_error);
+ 
+-  /* Only break on newline characters, not nuls. */
+-  g_io_channel_set_line_term (channel, "\n", 1);
++  /* Only break on newline characters, not nuls.
++   * Use length -1 here to exercise glib#2323; the case where length > 0
++   * is covered in glib/tests/protocol.c. */
++  g_io_channel_set_line_term (channel, "\n", -1);
+   g_io_channel_set_encoding (channel, NULL, &local_error);
+   g_assert_no_error (local_error);
+ 
+diff --git a/glib/tests/option-context.c b/glib/tests/option-context.c
+index 149d22353..88d2b80d1 100644
+--- a/glib/tests/option-context.c
++++ b/glib/tests/option-context.c
+@@ -27,6 +27,8 @@
+ #include <string.h>
+ #include <locale.h>
+ 
++#include "gstrfuncsprivate.h"
++
+ static GOptionEntry main_entries[] = {
+   { "main-switch", 0, 0,
+     G_OPTION_ARG_NONE, NULL,
+@@ -256,7 +258,7 @@ join_stringv (int argc, char **argv)
+ static char **
+ copy_stringv (char **argv, int argc)
+ {
+-  return g_memdup (argv, sizeof (char *) * (argc + 1));
++  return g_memdup2 (argv, sizeof (char *) * (argc + 1));
+ }
+ 
+ static void
+@@ -2323,7 +2325,7 @@ test_group_parse (void)
+   g_option_context_add_group (context, group);
+ 
+   argv = split_string ("program --test arg1 -f arg2 --group-test arg3 --frob arg4 -z arg5", &argc);
+-  orig_argv = g_memdup (argv, (argc + 1) * sizeof (char *));
++  orig_argv = g_memdup2 (argv, (argc + 1) * sizeof (char *));
+ 
+   retval = g_option_context_parse (context, &argc, &argv, &error);
+ 
+diff --git a/glib/tests/strfuncs.c b/glib/tests/strfuncs.c
+index e1f9619c7..d968afff9 100644
+--- a/glib/tests/strfuncs.c
++++ b/glib/tests/strfuncs.c
+@@ -32,6 +32,8 @@
+ #include <string.h>
+ #include "glib.h"
+ 
++#include "gstrfuncsprivate.h"
++
+ #if defined (_MSC_VER) && (_MSC_VER <= 1800)
+ #define isnan(x) _isnan(x)
+ 
+@@ -219,6 +221,26 @@ test_memdup (void)
+   g_free (str_dup);
+ }
+ 
++/* Testing g_memdup2() function with various positive and negative cases */
++static void
++test_memdup2 (void)
++{
++  gchar *str_dup = NULL;
++  const gchar *str = "The quick brown fox jumps over the lazy dog";
++
++  /* Testing negative cases */
++  g_assert_null (g_memdup2 (NULL, 1024));
++  g_assert_null (g_memdup2 (str, 0));
++  g_assert_null (g_memdup2 (NULL, 0));
++
++  /* Testing normal usage cases */
++  str_dup = g_memdup2 (str, strlen (str) + 1);
++  g_assert_nonnull (str_dup);
++  g_assert_cmpstr (str, ==, str_dup);
++
++  g_free (str_dup);
++}
++
+ /* Testing g_strpcpy() function with various positive and negative cases */
+ static void
+ test_stpcpy (void)
+@@ -2523,6 +2545,7 @@ main (int   argc,
+   g_test_add_func ("/strfuncs/has-prefix", test_has_prefix);
+   g_test_add_func ("/strfuncs/has-suffix", test_has_suffix);
+   g_test_add_func ("/strfuncs/memdup", test_memdup);
++  g_test_add_func ("/strfuncs/memdup2", test_memdup2);
+   g_test_add_func ("/strfuncs/stpcpy", test_stpcpy);
+   g_test_add_func ("/strfuncs/str_match_string", test_str_match_string);
+   g_test_add_func ("/strfuncs/str_tokenize_and_fold", test_str_tokenize_and_fold);
+diff --git a/gobject/gsignal.c b/gobject/gsignal.c
+index 45effa92d..effbfec62 100644
+--- a/gobject/gsignal.c
++++ b/gobject/gsignal.c
+@@ -28,6 +28,7 @@
+ #include <signal.h>
+ 
+ #include "gsignal.h"
++#include "gstrfuncsprivate.h"
+ #include "gtype-private.h"
+ #include "gbsearcharray.h"
+ #include "gvaluecollector.h"
+@@ -1809,7 +1810,7 @@ g_signal_newv (const gchar       *signal_name,
+   node->single_va_closure_is_valid = FALSE;
+   node->flags = signal_flags & G_SIGNAL_FLAGS_MASK;
+   node->n_params = n_params;
+-  node->param_types = g_memdup (param_types, sizeof (GType) * n_params);
++  node->param_types = g_memdup2 (param_types, sizeof (GType) * n_params);
+   node->return_type = return_type;
+   node->class_closure_bsa = NULL;
+   if (accumulator)
+diff --git a/gobject/gtype.c b/gobject/gtype.c
+index b5ef2d11e..8d152dccc 100644
+--- a/gobject/gtype.c
++++ b/gobject/gtype.c
+@@ -33,6 +33,7 @@
+ 
+ #include "glib-private.h"
+ #include "gconstructor.h"
++#include "gstrfuncsprivate.h"
+ 
+ #ifdef G_OS_WIN32
+ #include <windows.h>
+@@ -1470,7 +1471,7 @@ type_add_interface_Wm (TypeNode             *node,
+   iholder->next = iface_node_get_holders_L (iface);
+   iface_node_set_holders_W (iface, iholder);
+   iholder->instance_type = NODE_TYPE (node);
+-  iholder->info = info ? g_memdup (info, sizeof (*info)) : NULL;
++  iholder->info = info ? g_memdup2 (info, sizeof (*info)) : NULL;
+   iholder->plugin = plugin;
+ 
+   /* create an iface entry for this type */
+@@ -1731,7 +1732,7 @@ type_iface_retrieve_holder_info_Wm (TypeNode *iface,
+         INVALID_RECURSION ("g_type_plugin_*", iholder->plugin, NODE_NAME (iface));
+       
+       check_interface_info_I (iface, instance_type, &tmp_info);
+-      iholder->info = g_memdup (&tmp_info, sizeof (tmp_info));
++      iholder->info = g_memdup2 (&tmp_info, sizeof (tmp_info));
+     }
+   
+   return iholder;      /* we don't modify write lock upon returning NULL */
+@@ -2016,10 +2017,10 @@ type_iface_vtable_base_init_Wm (TypeNode *iface,
+       IFaceEntry *pentry = type_lookup_iface_entry_L (pnode, iface);
+       
+       if (pentry)
+-       vtable = g_memdup (pentry->vtable, iface->data->iface.vtable_size);
++       vtable = g_memdup2 (pentry->vtable, iface->data->iface.vtable_size);
+     }
+   if (!vtable)
+-    vtable = g_memdup (iface->data->iface.dflt_vtable, iface->data->iface.vtable_size);
++    vtable = g_memdup2 (iface->data->iface.dflt_vtable, iface->data->iface.vtable_size);
+   entry->vtable = vtable;
+   vtable->g_type = NODE_TYPE (iface);
+   vtable->g_instance_type = NODE_TYPE (node);
+diff --git a/gobject/gtypemodule.c b/gobject/gtypemodule.c
+index 4ecaf8c88..20911fafd 100644
+--- a/gobject/gtypemodule.c
++++ b/gobject/gtypemodule.c
+@@ -19,6 +19,7 @@
+ 
+ #include <stdlib.h>
+ 
++#include "gstrfuncsprivate.h"
+ #include "gtypeplugin.h"
+ #include "gtypemodule.h"
+ 
+@@ -436,7 +437,7 @@ g_type_module_register_type (GTypeModule     *module,
+   module_type_info->loaded = TRUE;
+   module_type_info->info = *type_info;
+   if (type_info->value_table)
+-    module_type_info->info.value_table = g_memdup (type_info->value_table,
++    module_type_info->info.value_table = g_memdup2 (type_info->value_table,
+                                                   sizeof (GTypeValueTable));
+ 
+   return module_type_info->type;
+diff --git a/gobject/tests/param.c b/gobject/tests/param.c
+index 93c3f4b94..0a77e51b7 100644
+--- a/gobject/tests/param.c
++++ b/gobject/tests/param.c
+@@ -2,6 +2,8 @@
+ #include <glib-object.h>
+ #include <stdlib.h>
+ 
++#include "gstrfuncsprivate.h"
++
+ static void
+ test_param_value (void)
+ {
+@@ -874,7 +876,7 @@ main (int argc, char *argv[])
+             test_path = g_strdup_printf ("/param/implement/subprocess/%d-%d-%d-%d",
+                                          data.change_this_flag, data.change_this_type,
+                                          data.use_this_flag, data.use_this_type);
+-            test_data = g_memdup (&data, sizeof (TestParamImplementData));
++            test_data = g_memdup2 (&data, sizeof (TestParamImplementData));
+             g_test_add_data_func_full (test_path, test_data, test_param_implement_child, g_free);
+             g_free (test_path);
+           }
diff --git a/meta/recipes-core/glib-2.0/glib-2.0_2.64.5.bb b/meta/recipes-core/glib-2.0/glib-2.0_2.64.5.bb
index b9462bc945..ed7b649dc6 100644
--- a/meta/recipes-core/glib-2.0/glib-2.0_2.64.5.bb
+++ b/meta/recipes-core/glib-2.0/glib-2.0_2.64.5.bb
@@ -18,6 +18,7 @@ SRC_URI = "${GNOME_MIRROR}/glib/${SHRT_VER}/glib-${PV}.tar.xz \
            file://0001-gio-tests-resources.c-comment-out-a-build-host-only-.patch \
            file://tzdata-update.patch \
            file://CVE-2020-35457.patch \
+           file://CVE-2021-27219.patch \
            "
 
 SRC_URI_append_class-native = " file://relocate-modules.patch"