linux: Fix stack-related sub-process shutdown crashes (fixes #3912)

On Linux systems the stack frame reference canary will be purposely
changed when forking sub-processes (see https://crbug.com/40181003).
To avoid sub-process shutdown crashes the NO_STACK_PROTECTOR
annotation must be added to all functions in the call stack leading to
CefExecuteProcess(). Applications that cannot add this annotation must
instead pass the `--change-stack-guard-on-fork=disable` command-line
flag.

tools/cef_parser.py

@@ -522,9 +522,9 @@ def dict_to_str(dict):
 # Attribute keys allowed in CEF metadata comments.
 COMMON_ATTRIB_KEYS = ('added', 'removed')
 CLASS_ATTRIB_KEYS = COMMON_ATTRIB_KEYS + ('no_debugct_check', 'source')
-FUNCTION_ATTRIB_KEYS = COMMON_ATTRIB_KEYS + ('api_hash_check', 'capi_name',
-                                             'count_func', 'default_retval',
-                                             'index_param', 'optional_param')
+FUNCTION_ATTRIB_KEYS = COMMON_ATTRIB_KEYS + (
+    'api_hash_check', 'capi_name', 'count_func', 'default_retval',
+    'index_param', 'no_stack_protector', 'optional_param')
 
 # regex for matching comment-formatted attributes
 _cre_attrib = r'/\*--cef\(([A-Za-z0-9_ ,=:\n]{0,})\)--\*/'

tools/make_cpptoc_impl.py

@@ -9,10 +9,13 @@ import functools
 
 
 def make_cpptoc_impl_proto(name, func, parts):
+  proto = ''
+  if func.has_attrib('no_stack_protector'):
+    proto += 'NO_STACK_PROTECTOR '
   if isinstance(func, obj_function_virtual):
-    proto = parts['retval'] + ' CEF_CALLBACK'
+    proto += parts['retval'] + ' CEF_CALLBACK'
   else:
-    proto = 'CEF_EXPORT ' + parts['retval']
+    proto += 'CEF_EXPORT ' + parts['retval']
 
   proto += ' ' + name + '(' + ', '.join(parts['args']) + ')'
   return proto

tools/make_ctocpp_impl.py

@@ -11,6 +11,8 @@ def make_ctocpp_impl_proto(clsname, name, func, parts):
   const = ''
 
   proto = 'NO_SANITIZE("cfi-icall") '
+  if func.has_attrib('no_stack_protector'):
+    proto += 'NO_STACK_PROTECTOR '
   if clsname is None:
     proto += 'CEF_GLOBAL ' + parts['retval'] + ' '
   else: